diff --git a/ChangeLog b/ChangeLog
index 66a8ce9..de3b8ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -41,6 +41,14 @@
      mbedtls_ctr_drbg_update() -> mbedtls_ctr_drbg_update_ret()
      mbedtls_hmac_drbg_update() -> mbedtls_hmac_drbg_update_ret()
    * Extend ECDH interface to enable alternative implementations.
+   * Deprecate the ARIA error MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH
+     in favour of a new generic error MBEDTLS_ERR_ARIA_BAD_INPUT_DATA.
+   * Deprecate the CAMELLIA error MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
+     in favour a new generic error MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA.
+   * Deprecate the Blowfish error MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+     in favour of a new generic error MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA.
+   * Add validation checks for input parameters to functions in the CCM module.
+   * Add validation checks for input parameters to functions in the GCM module.
 
 New deprecations
    * Deprecate mbedtls_ctr_drbg_update and mbedtls_hmac_drbg_update
diff --git a/include/mbedtls/aes.h b/include/mbedtls/aes.h
index 11edc0f..b42e564 100644
--- a/include/mbedtls/aes.h
+++ b/include/mbedtls/aes.h
@@ -197,8 +197,10 @@
  *                 sets the encryption key.
  *
  * \param ctx      The AES XTS context to which the key should be bound.
+ *                 It must be initialized.
  * \param key      The encryption key. This is comprised of the XTS key1
  *                 concatenated with the XTS key2.
+ *                 This must be a readable buffer of size \p keybits bits.
  * \param keybits  The size of \p key passed in bits. Valid options are:
  *                 <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li>
  *                 <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul>
@@ -215,8 +217,10 @@
  *                 sets the decryption key.
  *
  * \param ctx      The AES XTS context to which the key should be bound.
+ *                 It must be initialized.
  * \param key      The decryption key. This is comprised of the XTS key1
  *                 concatenated with the XTS key2.
+ *                 This must be a readable buffer of size \p keybits bits.
  * \param keybits  The size of \p key passed in bits. Valid options are:
  *                 <ul><li>256 bits (each of key1 and key2 is a 128-bit key)</li>
  *                 <li>512 bits (each of key1 and key2 is a 256-bit key)</li></ul>
@@ -242,10 +246,13 @@
  *                 call to this API with the same context.
  *
  * \param ctx      The AES context to use for encryption or decryption.
+ *                 It must be initialized and bound to a key.
  * \param mode     The AES operation: #MBEDTLS_AES_ENCRYPT or
  *                 #MBEDTLS_AES_DECRYPT.
- * \param input    The 16-Byte buffer holding the input data.
- * \param output   The 16-Byte buffer holding the output data.
+ * \param input    The buffer holding the input data.
+ *                 It must be readable and at least \c 16 Bytes long.
+ * \param output   The buffer where the output data will be written.
+ *                 It must be writeable and at least \c 16 Bytes long.
 
  * \return         \c 0 on success.
  */
@@ -268,8 +275,8 @@
  *         mbedtls_aes_setkey_enc() or mbedtls_aes_setkey_dec() must be called
  *         before the first call to this API with the same context.
  *
- * \note   This function operates on aligned blocks, that is, the input size
- *         must be a multiple of the AES block size of 16 Bytes.
+ * \note   This function operates on full blocks, that is, the input size
+ *         must be a multiple of the AES block size of \c 16 Bytes.
  *
  * \note   Upon exit, the content of the IV is updated so that you can
  *         call the same function again on the next
@@ -280,13 +287,17 @@
  *
  *
  * \param ctx      The AES context to use for encryption or decryption.
+ *                 It must be initialized and bound to a key.
  * \param mode     The AES operation: #MBEDTLS_AES_ENCRYPT or
  *                 #MBEDTLS_AES_DECRYPT.
  * \param length   The length of the input data in Bytes. This must be a
- *                 multiple of the block size (16 Bytes).
+ *                 multiple of the block size (\c 16 Bytes).
  * \param iv       Initialization vector (updated after use).
+ *                 It must be a readable and writeable buffer of \c 16 Bytes.
  * \param input    The buffer holding the input data.
+ *                 It must be readable and of size \p length Bytes.
  * \param output   The buffer holding the output data.
+ *                 It must be writeable and of size \p length Bytes.
  *
  * \return         \c 0 on success.
  * \return         #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH
@@ -314,9 +325,10 @@
  *             returns #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH.
  *
  * \param ctx          The AES XTS context to use for AES XTS operations.
+ *                     It must be initialized and bound to a key.
  * \param mode         The AES operation: #MBEDTLS_AES_ENCRYPT or
  *                     #MBEDTLS_AES_DECRYPT.
- * \param length       The length of a data unit in bytes. This can be any
+ * \param length       The length of a data unit in Bytes. This can be any
  *                     length between 16 bytes and 2^24 bytes inclusive
  *                     (between 1 and 2^20 block cipher blocks).
  * \param data_unit    The address of the data unit encoded as an array of 16
@@ -324,15 +336,15 @@
  *                     is typically the index of the block device sector that
  *                     contains the data.
  * \param input        The buffer holding the input data (which is an entire
- *                     data unit). This function reads \p length bytes from \p
+ *                     data unit). This function reads \p length Bytes from \p
  *                     input.
  * \param output       The buffer holding the output data (which is an entire
- *                     data unit). This function writes \p length bytes to \p
+ *                     data unit). This function writes \p length Bytes to \p
  *                     output.
  *
  * \return             \c 0 on success.
  * \return             #MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH if \p length is
- *                     smaller than an AES block in size (16 bytes) or if \p
+ *                     smaller than an AES block in size (16 Bytes) or if \p
  *                     length is larger than 2^20 blocks (16 MiB).
  */
 int mbedtls_aes_crypt_xts( mbedtls_aes_xts_context *ctx,
@@ -368,13 +380,18 @@
  *
  *
  * \param ctx      The AES context to use for encryption or decryption.
+ *                 It must be initialized and bound to a key.
  * \param mode     The AES operation: #MBEDTLS_AES_ENCRYPT or
  *                 #MBEDTLS_AES_DECRYPT.
- * \param length   The length of the input data.
+ * \param length   The length of the input data in Bytes.
  * \param iv_off   The offset in IV (updated after use).
+ *                 It must point to a valid \c size_t.
  * \param iv       The initialization vector (updated after use).
+ *                 It must be a readable and writeable buffer of \c 16 Bytes.
  * \param input    The buffer holding the input data.
+ *                 It must be readable and of size \p length Bytes.
  * \param output   The buffer holding the output data.
+ *                 It must be writeable and of size \p length Bytes.
  *
  * \return         \c 0 on success.
  */
@@ -409,12 +426,16 @@
  *
  *
  * \param ctx      The AES context to use for encryption or decryption.
+ *                 It must be initialized and bound to a key.
  * \param mode     The AES operation: #MBEDTLS_AES_ENCRYPT or
  *                 #MBEDTLS_AES_DECRYPT
  * \param length   The length of the input data.
  * \param iv       The initialization vector (updated after use).
+ *                 It must be a readable and writeable buffer of \c 16 Bytes.
  * \param input    The buffer holding the input data.
+ *                 It must be readable and of size \p length Bytes.
  * \param output   The buffer holding the output data.
+ *                 It must be writeable and of size \p length Bytes.
  *
  * \return         \c 0 on success.
  */
@@ -459,11 +480,16 @@
  *              will compromise security.
  *
  * \param ctx      The AES context to use for encryption or decryption.
+ *                 It must be initialized and bound to a key.
  * \param length   The length of the input data.
  * \param iv_off   The offset in IV (updated after use).
+ *                 It must point to a valid \c size_t.
  * \param iv       The initialization vector (updated after use).
+ *                 It must be a readable and writeable buffer of \c 16 Bytes.
  * \param input    The buffer holding the input data.
+ *                 It must be readable and of size \p length Bytes.
  * \param output   The buffer holding the output data.
+ *                 It must be writeable and of size \p length Bytes.
  *
  * \return         \c 0 on success.
  */
@@ -535,15 +561,21 @@
  *             securely discarded as soon as it's no longer needed.
  *
  * \param ctx              The AES context to use for encryption or decryption.
+ *                         It must be initialized and bound to a key.
  * \param length           The length of the input data.
  * \param nc_off           The offset in the current \p stream_block, for
  *                         resuming within the current cipher stream. The
  *                         offset pointer should be 0 at the start of a stream.
+ *                         It must point to a valid \c size_t.
  * \param nonce_counter    The 128-bit nonce and counter.
+ *                         It must be a readable-writeable buffer of \c 16 Bytes.
  * \param stream_block     The saved stream block for resuming. This is
  *                         overwritten by the function.
+ *                         It must be a readable-writeable buffer of \c 16 Bytes.
  * \param input            The buffer holding the input data.
+ *                         It must be readable and of size \p length Bytes.
  * \param output           The buffer holding the output data.
+ *                         It must be writeable and of size \p length Bytes.
  *
  * \return                 \c 0 on success.
  */
@@ -596,7 +628,7 @@
  * \brief           Deprecated internal AES block encryption function
  *                  without return value.
  *
- * \deprecated      Superseded by mbedtls_aes_encrypt_ext() in 2.5.0.
+ * \deprecated      Superseded by mbedtls_internal_aes_encrypt()
  *
  * \param ctx       The AES context to use for encryption.
  * \param input     Plaintext block.
@@ -610,7 +642,7 @@
  * \brief           Deprecated internal AES block decryption function
  *                  without return value.
  *
- * \deprecated      Superseded by mbedtls_aes_decrypt_ext() in 2.5.0.
+ * \deprecated      Superseded by mbedtls_internal_aes_decrypt()
  *
  * \param ctx       The AES context to use for decryption.
  * \param input     Ciphertext block.
diff --git a/include/mbedtls/aesni.h b/include/mbedtls/aesni.h
index 746baa0..0196f49 100644
--- a/include/mbedtls/aesni.h
+++ b/include/mbedtls/aesni.h
@@ -2,6 +2,9 @@
  * \file aesni.h
  *
  * \brief AES-NI for hardware AES acceleration on some Intel processors
+ *
+ * \warning These functions are only for internal use by other library
+ *          functions; you must not call them directly.
  */
 /*
  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
@@ -42,7 +45,10 @@
 #endif
 
 /**
- * \brief          AES-NI features detection routine
+ * \brief          Internal function to detect the AES-NI feature in CPUs.
+ *
+ * \note           This function is only for internal use by other library
+ *                 functions; you must not call it directly.
  *
  * \param what     The feature to detect
  *                 (MBEDTLS_AESNI_AES or MBEDTLS_AESNI_CLMUL)
@@ -52,7 +58,10 @@
 int mbedtls_aesni_has_support( unsigned int what );
 
 /**
- * \brief          AES-NI AES-ECB block en(de)cryption
+ * \brief          Internal AES-NI AES-ECB block encryption and decryption
+ *
+ * \note           This function is only for internal use by other library
+ *                 functions; you must not call it directly.
  *
  * \param ctx      AES context
  * \param mode     MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
@@ -62,12 +71,15 @@
  * \return         0 on success (cannot fail)
  */
 int mbedtls_aesni_crypt_ecb( mbedtls_aes_context *ctx,
-                     int mode,
-                     const unsigned char input[16],
-                     unsigned char output[16] );
+                             int mode,
+                             const unsigned char input[16],
+                             unsigned char output[16] );
 
 /**
- * \brief          GCM multiplication: c = a * b in GF(2^128)
+ * \brief          Internal GCM multiplication: c = a * b in GF(2^128)
+ *
+ * \note           This function is only for internal use by other library
+ *                 functions; you must not call it directly.
  *
  * \param c        Result
  * \param a        First operand
@@ -77,21 +89,29 @@
  *                 elements of GF(2^128) as per the GCM spec.
  */
 void mbedtls_aesni_gcm_mult( unsigned char c[16],
-                     const unsigned char a[16],
-                     const unsigned char b[16] );
+                             const unsigned char a[16],
+                             const unsigned char b[16] );
 
 /**
- * \brief           Compute decryption round keys from encryption round keys
+ * \brief           Internal round key inversion. This function computes
+ *                  decryption round keys from the encryption round keys.
+ *
+ * \note            This function is only for internal use by other library
+ *                  functions; you must not call it directly.
  *
  * \param invkey    Round keys for the equivalent inverse cipher
  * \param fwdkey    Original round keys (for encryption)
  * \param nr        Number of rounds (that is, number of round keys minus one)
  */
 void mbedtls_aesni_inverse_key( unsigned char *invkey,
-                        const unsigned char *fwdkey, int nr );
+                                const unsigned char *fwdkey,
+                                int nr );
 
 /**
- * \brief           Perform key expansion (for encryption)
+ * \brief           Internal key expansion for encryption
+ *
+ * \note            This function is only for internal use by other library
+ *                  functions; you must not call it directly.
  *
  * \param rk        Destination buffer where the round keys are written
  * \param key       Encryption key
@@ -100,8 +120,8 @@
  * \return          0 if successful, or MBEDTLS_ERR_AES_INVALID_KEY_LENGTH
  */
 int mbedtls_aesni_setkey_enc( unsigned char *rk,
-                      const unsigned char *key,
-                      size_t bits );
+                              const unsigned char *key,
+                              size_t bits );
 
 #ifdef __cplusplus
 }
diff --git a/include/mbedtls/aria.h b/include/mbedtls/aria.h
index 483d4c2..1e8956e 100644
--- a/include/mbedtls/aria.h
+++ b/include/mbedtls/aria.h
@@ -39,6 +39,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "platform_util.h"
+
 #define MBEDTLS_ARIA_ENCRYPT     1 /**< ARIA encryption. */
 #define MBEDTLS_ARIA_DECRYPT     0 /**< ARIA decryption. */
 
@@ -46,8 +48,12 @@
 #define MBEDTLS_ARIA_MAX_ROUNDS  16 /**< Maxiumum number of rounds in ARIA. */
 #define MBEDTLS_ARIA_MAX_KEYSIZE 32 /**< Maximum size of an ARIA key in bytes. */
 
-#define MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH   -0x005C  /**< Invalid key length. */
-#define MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH -0x005E  /**< Invalid data input length. */
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH   MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x005C )
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
+#define MBEDTLS_ERR_ARIA_BAD_INPUT_DATA -0x005C /**< Bad input data. */
+
+#define MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH -0x005E /**< Invalid data input length. */
 
 /* MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE is deprecated and should not be used.
  */
@@ -85,14 +91,16 @@
  *                 It must be the first API called before using
  *                 the context.
  *
- * \param ctx      The ARIA context to initialize.
+ * \param ctx      The ARIA context to initialize. This must not be \c NULL.
  */
 void mbedtls_aria_init( mbedtls_aria_context *ctx );
 
 /**
  * \brief          This function releases and clears the specified ARIA context.
  *
- * \param ctx      The ARIA context to clear.
+ * \param ctx      The ARIA context to clear. This may be \c NULL, in which
+ *                 case this function returns immediately. If it is not \c NULL,
+ *                 it must point to an initialized ARIA context.
  */
 void mbedtls_aria_free( mbedtls_aria_context *ctx );
 
@@ -100,14 +108,16 @@
  * \brief          This function sets the encryption key.
  *
  * \param ctx      The ARIA context to which the key should be bound.
- * \param key      The encryption key.
- * \param keybits  The size of data passed in bits. Valid options are:
+ *                 This must be initialized.
+ * \param key      The encryption key. This must be a readable buffer
+ *                 of size \p keybits Bits.
+ * \param keybits  The size of \p key in Bits. Valid options are:
  *                 <ul><li>128 bits</li>
  *                 <li>192 bits</li>
  *                 <li>256 bits</li></ul>
  *
- * \return         \c 0 on success or #MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH
- *                 on failure.
+ * \return         \c 0 on success.
+ * \return         A negative error code on failure.
  */
 int mbedtls_aria_setkey_enc( mbedtls_aria_context *ctx,
                              const unsigned char *key,
@@ -117,13 +127,16 @@
  * \brief          This function sets the decryption key.
  *
  * \param ctx      The ARIA context to which the key should be bound.
- * \param key      The decryption key.
+ *                 This must be initialized.
+ * \param key      The decryption key. This must be a readable buffer
+ *                 of size \p keybits Bits.
  * \param keybits  The size of data passed. Valid options are:
  *                 <ul><li>128 bits</li>
  *                 <li>192 bits</li>
  *                 <li>256 bits</li></ul>
  *
- * \return         \c 0 on success, or #MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH on failure.
+ * \return         \c 0 on success.
+ * \return         A negative error code on failure.
  */
 int mbedtls_aria_setkey_dec( mbedtls_aria_context *ctx,
                              const unsigned char *key,
@@ -142,10 +155,12 @@
  *                 call to this API with the same context.
  *
  * \param ctx      The ARIA context to use for encryption or decryption.
+ *                 This must be initialized and bound to a key.
  * \param input    The 16-Byte buffer holding the input data.
  * \param output   The 16-Byte buffer holding the output data.
 
  * \return         \c 0 on success.
+ * \return         A negative error code on failure.
  */
 int mbedtls_aria_crypt_ecb( mbedtls_aria_context *ctx,
                             const unsigned char input[MBEDTLS_ARIA_BLOCKSIZE],
@@ -177,16 +192,21 @@
  *
  *
  * \param ctx      The ARIA context to use for encryption or decryption.
- * \param mode     The ARIA operation: #MBEDTLS_ARIA_ENCRYPT or
- *                 #MBEDTLS_ARIA_DECRYPT.
+ *                 This must be initialized and bound to a key.
+ * \param mode     The mode of operation. This must be either
+ *                 #MBEDTLS_ARIA_ENCRYPT for encryption, or
+ *                 #MBEDTLS_ARIA_DECRYPT for decryption.
  * \param length   The length of the input data in Bytes. This must be a
  *                 multiple of the block size (16 Bytes).
  * \param iv       Initialization vector (updated after use).
- * \param input    The buffer holding the input data.
- * \param output   The buffer holding the output data.
+ *                 This must be a readable buffer of size 16 Bytes.
+ * \param input    The buffer holding the input data. This must
+ *                 be a readable buffer of length \p length Bytes.
+ * \param output   The buffer holding the output data. This must
+ *                 be a writable buffer of length \p length Bytes.
  *
- * \return         \c 0 on success, or #MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH
- *                 on failure.
+ * \return         \c 0 on success.
+ * \return         A negative error code on failure.
  */
 int mbedtls_aria_crypt_cbc( mbedtls_aria_context *ctx,
                             int mode,
@@ -221,15 +241,22 @@
  *
  *
  * \param ctx      The ARIA context to use for encryption or decryption.
- * \param mode     The ARIA operation: #MBEDTLS_ARIA_ENCRYPT or
- *                 #MBEDTLS_ARIA_DECRYPT.
- * \param length   The length of the input data.
+ *                 This must be initialized and bound to a key.
+ * \param mode     The mode of operation. This must be either
+ *                 #MBEDTLS_ARIA_ENCRYPT for encryption, or
+ *                 #MBEDTLS_ARIA_DECRYPT for decryption.
+ * \param length   The length of the input data \p input in Bytes.
  * \param iv_off   The offset in IV (updated after use).
+ *                 This must not be larger than 15.
  * \param iv       The initialization vector (updated after use).
- * \param input    The buffer holding the input data.
- * \param output   The buffer holding the output data.
+ *                 This must be a readable buffer of size 16 Bytes.
+ * \param input    The buffer holding the input data. This must
+ *                 be a readable buffer of length \p length Bytes.
+ * \param output   The buffer holding the output data. This must
+ *                 be a writable buffer of length \p length Bytes.
  *
  * \return         \c 0 on success.
+ * \return         A negative error code on failure.
  */
 int mbedtls_aria_crypt_cfb128( mbedtls_aria_context *ctx,
                                int mode,
@@ -299,17 +326,24 @@
  *             securely discarded as soon as it's no longer needed.
  *
  * \param ctx              The ARIA context to use for encryption or decryption.
- * \param length           The length of the input data.
- * \param nc_off           The offset in the current \p stream_block, for
- *                         resuming within the current cipher stream. The
- *                         offset pointer should be 0 at the start of a stream.
- * \param nonce_counter    The 128-bit nonce and counter.
- * \param stream_block     The saved stream block for resuming. This is
- *                         overwritten by the function.
- * \param input            The buffer holding the input data.
- * \param output           The buffer holding the output data.
+ *                         This must be initialized and bound to a key.
+ * \param length           The length of the input data \p input in Bytes.
+ * \param nc_off           The offset in Bytes in the current \p stream_block,
+ *                         for resuming within the current cipher stream. The
+ *                         offset pointer should be \c 0 at the start of a
+ *                         stream. This must not be larger than \c 15 Bytes.
+ * \param nonce_counter    The 128-bit nonce and counter. This must point to
+ *                         a read/write buffer of length \c 16 bytes.
+ * \param stream_block     The saved stream block for resuming. This must
+ *                         point to a read/write buffer of length \c 16 bytes.
+ *                         This is overwritten by the function.
+ * \param input            The buffer holding the input data. This must
+ *                         be a readable buffer of length \p length Bytes.
+ * \param output           The buffer holding the output data. This must
+ *                         be a writable buffer of length \p length Bytes.
  *
- * \return     \c 0 on success.
+ * \return                 \c 0 on success.
+ * \return                 A negative error code on failure.
  */
 int mbedtls_aria_crypt_ctr( mbedtls_aria_context *ctx,
                             size_t length,
diff --git a/include/mbedtls/blowfish.h b/include/mbedtls/blowfish.h
index 82b772a..f01573d 100644
--- a/include/mbedtls/blowfish.h
+++ b/include/mbedtls/blowfish.h
@@ -33,6 +33,8 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "platform_util.h"
+
 #define MBEDTLS_BLOWFISH_ENCRYPT     1
 #define MBEDTLS_BLOWFISH_DECRYPT     0
 #define MBEDTLS_BLOWFISH_MAX_KEY_BITS     448
@@ -40,14 +42,17 @@
 #define MBEDTLS_BLOWFISH_ROUNDS      16         /**< Rounds to use. When increasing this value, make sure to extend the initialisation vectors */
 #define MBEDTLS_BLOWFISH_BLOCKSIZE   8          /* Blowfish uses 64 bit blocks */
 
-#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH                -0x0016  /**< Invalid key length. */
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH   MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0016 )
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
+#define MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA -0x0016 /**< Bad input data. */
+
+#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 /**< Invalid data input length. */
 
 /* MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED is deprecated and should not be used.
  */
 #define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED                   -0x0017  /**< Blowfish hardware accelerator failed. */
 
-#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH              -0x0018  /**< Invalid data input length. */
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -71,40 +76,53 @@
 #endif /* MBEDTLS_BLOWFISH_ALT */
 
 /**
- * \brief          Initialize Blowfish context
+ * \brief          Initialize a Blowfish context.
  *
- * \param ctx      Blowfish context to be initialized
+ * \param ctx      The Blowfish context to be initialized.
+ *                 This must not be \c NULL.
  */
 void mbedtls_blowfish_init( mbedtls_blowfish_context *ctx );
 
 /**
- * \brief          Clear Blowfish context
+ * \brief          Clear a Blowfish context.
  *
- * \param ctx      Blowfish context to be cleared
+ * \param ctx      The Blowfish context to be cleared.
+ *                 This may be \c NULL, in which case this function
+ *                 returns immediately. If it is not \c NULL, it must
+ *                 point to an initialized Blowfish context.
  */
 void mbedtls_blowfish_free( mbedtls_blowfish_context *ctx );
 
 /**
- * \brief          Blowfish key schedule
+ * \brief          Perform a Blowfish key schedule operation.
  *
- * \param ctx      Blowfish context to be initialized
- * \param key      encryption key
- * \param keybits  must be between 32 and 448 bits
+ * \param ctx      The Blowfish context to perform the key schedule on.
+ * \param key      The encryption key. This must be a readable buffer of
+ *                 length \p keybits Bits.
+ * \param keybits  The length of \p key in Bits. This must be between
+ *                 \c 32 and \c 448 and a multiple of \c 8.
  *
- * \return         0 if successful, or MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_blowfish_setkey( mbedtls_blowfish_context *ctx, const unsigned char *key,
                      unsigned int keybits );
 
 /**
- * \brief          Blowfish-ECB block encryption/decryption
+ * \brief          Perform a Blowfish-ECB block encryption/decryption operation.
  *
- * \param ctx      Blowfish context
- * \param mode     MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT
- * \param input    8-byte input block
- * \param output   8-byte output block
+ * \param ctx      The Blowfish context to use. This must be initialized
+ *                 and bound to a key.
+ * \param mode     The mode of operation. Possible values are
+ *                 #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
+ *                 #MBEDTLS_BLOWFISH_DECRYPT for decryption.
+ * \param input    The input block. This must be a readable buffer
+ *                 of size \c 8 Bytes.
+ * \param output   The output block. This must be a writable buffer
+ *                 of size \c 8 Bytes.
  *
- * \return         0 if successful
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_blowfish_crypt_ecb( mbedtls_blowfish_context *ctx,
                         int mode,
@@ -113,9 +131,7 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_CBC)
 /**
- * \brief          Blowfish-CBC buffer encryption/decryption
- *                 Length should be a multiple of the block
- *                 size (8 bytes)
+ * \brief          Perform a Blowfish-CBC buffer encryption/decryption operation.
  *
  * \note           Upon exit, the content of the IV is updated so that you can
  *                 call the function same function again on the following
@@ -125,15 +141,22 @@
  *                 IV, you should either save it manually or use the cipher
  *                 module instead.
  *
- * \param ctx      Blowfish context
- * \param mode     MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT
- * \param length   length of the input data
- * \param iv       initialization vector (updated after use)
- * \param input    buffer holding the input data
- * \param output   buffer holding the output data
+ * \param ctx      The Blowfish context to use. This must be initialized
+ *                 and bound to a key.
+ * \param mode     The mode of operation. Possible values are
+ *                 #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
+ *                 #MBEDTLS_BLOWFISH_DECRYPT for decryption.
+ * \param length   The length of the input data in Bytes. This must be
+ *                 multiple of \c 8.
+ * \param iv       The initialization vector. This must be a read/write buffer
+ *                 of length \c 8 Bytes. It is updated by this function.
+ * \param input    The input data. This must be a readable buffer of length
+ *                 \p length Bytes.
+ * \param output   The output data. This must be a writable buffer of length
+ *                 \p length Bytes.
  *
- * \return         0 if successful, or
- *                 MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_blowfish_crypt_cbc( mbedtls_blowfish_context *ctx,
                         int mode,
@@ -145,7 +168,7 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_CFB)
 /**
- * \brief          Blowfish CFB buffer encryption/decryption.
+ * \brief          Perform a Blowfish CFB buffer encryption/decryption operation.
  *
  * \note           Upon exit, the content of the IV is updated so that you can
  *                 call the function same function again on the following
@@ -155,15 +178,25 @@
  *                 IV, you should either save it manually or use the cipher
  *                 module instead.
  *
- * \param ctx      Blowfish context
- * \param mode     MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT
- * \param length   length of the input data
- * \param iv_off   offset in IV (updated after use)
- * \param iv       initialization vector (updated after use)
- * \param input    buffer holding the input data
- * \param output   buffer holding the output data
+ * \param ctx      The Blowfish context to use. This must be initialized
+ *                 and bound to a key.
+ * \param mode     The mode of operation. Possible values are
+ *                 #MBEDTLS_BLOWFISH_ENCRYPT for encryption, or
+ *                 #MBEDTLS_BLOWFISH_DECRYPT for decryption.
+ * \param length   The length of the input data in Bytes.
+ * \param iv_off   The offset in the initialiation vector.
+ *                 The value pointed to must be smaller than \c 8 Bytes.
+ *                 It is updated by this function to support the aforementioned
+ *                 streaming usage.
+ * \param iv       The initialization vector. This must be a read/write buffer
+ *                 of size \c 8 Bytes. It is updated after use.
+ * \param input    The input data. This must be a readable buffer of length
+ *                 \p length Bytes.
+ * \param output   The output data. This must be a writable buffer of length
+ *                 \p length Bytes.
  *
- * \return         0 if successful
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_blowfish_crypt_cfb64( mbedtls_blowfish_context *ctx,
                           int mode,
@@ -176,7 +209,7 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_CTR)
 /**
- * \brief               Blowfish-CTR buffer encryption/decryption
+ * \brief      Perform a Blowfish-CTR buffer encryption/decryption operation.
  *
  * \warning    You must never reuse a nonce value with the same key. Doing so
  *             would void the encryption for the two messages encrypted with
@@ -219,18 +252,24 @@
  *             content must not be written to insecure storage and should be
  *             securely discarded as soon as it's no longer needed.
  *
- * \param ctx           Blowfish context
- * \param length        The length of the data
+ * \param ctx           The Blowfish context to use. This must be initialized
+ *                      and bound to a key.
+ * \param length        The length of the input data in Bytes.
  * \param nc_off        The offset in the current stream_block (for resuming
- *                      within current cipher stream). The offset pointer to
- *                      should be 0 at the start of a stream.
- * \param nonce_counter The 64-bit nonce and counter.
- * \param stream_block  The saved stream-block for resuming. Is overwritten
- *                      by the function.
- * \param input         The input data stream
- * \param output        The output data stream
+ *                      within current cipher stream). The offset pointer
+ *                      should be \c 0 at the start of a stream and must be
+ *                      smaller than \c 8. It is updated by this function.
+ * \param nonce_counter The 64-bit nonce and counter. This must point to a
+ *                      read/write buffer of length \c 8 Bytes.
+ * \param stream_block  The saved stream-block for resuming. This must point to
+ *                      a read/write buffer of length \c 8 Bytes.
+ * \param input         The input data. This must be a readable buffer of
+ *                      length \p length Bytes.
+ * \param output        The output data. This must be a writable buffer of
+ *                      length \p length Bytes.
  *
- * \return         0 if successful
+ * \return              \c 0 if successful.
+ * \return              A negative error code on failure.
  */
 int mbedtls_blowfish_crypt_ctr( mbedtls_blowfish_context *ctx,
                         size_t length,
diff --git a/include/mbedtls/camellia.h b/include/mbedtls/camellia.h
index 1555867..0f7c42c 100644
--- a/include/mbedtls/camellia.h
+++ b/include/mbedtls/camellia.h
@@ -33,11 +33,17 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "platform_util.h"
+
 #define MBEDTLS_CAMELLIA_ENCRYPT     1
 #define MBEDTLS_CAMELLIA_DECRYPT     0
 
-#define MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH           -0x0024  /**< Invalid key length. */
-#define MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH         -0x0026  /**< Invalid data input length. */
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#define MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH   MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( -0x0024 )
+#endif /* !MBEDTLS_DEPRECATED_REMOVED */
+#define MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA -0x0024 /**< Bad input data. */
+
+#define MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH -0x0026 /**< Invalid data input length. */
 
 /* MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED is deprecated and should not be used.
  */
@@ -66,52 +72,68 @@
 #endif /* MBEDTLS_CAMELLIA_ALT */
 
 /**
- * \brief          Initialize CAMELLIA context
+ * \brief          Initialize a CAMELLIA context.
  *
- * \param ctx      CAMELLIA context to be initialized
+ * \param ctx      The CAMELLIA context to be initialized.
+ *                 This must not be \c NULL.
  */
 void mbedtls_camellia_init( mbedtls_camellia_context *ctx );
 
 /**
- * \brief          Clear CAMELLIA context
+ * \brief          Clear a CAMELLIA context.
  *
- * \param ctx      CAMELLIA context to be cleared
+ * \param ctx      The CAMELLIA context to be cleared. This may be \c NULL,
+ *                 in which case this function returns immediately. If it is not
+ *                 \c NULL, it must be initialized.
  */
 void mbedtls_camellia_free( mbedtls_camellia_context *ctx );
 
 /**
- * \brief          CAMELLIA key schedule (encryption)
+ * \brief          Perform a CAMELLIA key schedule operation for encryption.
  *
- * \param ctx      CAMELLIA context to be initialized
- * \param key      encryption key
- * \param keybits  must be 128, 192 or 256
+ * \param ctx      The CAMELLIA context to use. This must be initialized.
+ * \param key      The encryption key to use. This must be a readable buffer
+ *                 of size \p keybits Bits.
+ * \param keybits  The length of \p key in Bits. This must be either \c 128,
+ *                 \c 192 or \c 256.
  *
- * \return         0 if successful, or MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
-int mbedtls_camellia_setkey_enc( mbedtls_camellia_context *ctx, const unsigned char *key,
-                         unsigned int keybits );
+int mbedtls_camellia_setkey_enc( mbedtls_camellia_context *ctx,
+                                 const unsigned char *key,
+                                 unsigned int keybits );
 
 /**
- * \brief          CAMELLIA key schedule (decryption)
+ * \brief          Perform a CAMELLIA key schedule operation for decryption.
  *
- * \param ctx      CAMELLIA context to be initialized
- * \param key      decryption key
- * \param keybits  must be 128, 192 or 256
+ * \param ctx      The CAMELLIA context to use. This must be initialized.
+ * \param key      The decryption key. This must be a readable buffer
+ *                 of size \p keybits Bits.
+ * \param keybits  The length of \p key in Bits. This must be either \c 128,
+ *                 \c 192 or \c 256.
  *
- * \return         0 if successful, or MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
-int mbedtls_camellia_setkey_dec( mbedtls_camellia_context *ctx, const unsigned char *key,
-                         unsigned int keybits );
+int mbedtls_camellia_setkey_dec( mbedtls_camellia_context *ctx,
+                                 const unsigned char *key,
+                                 unsigned int keybits );
 
 /**
- * \brief          CAMELLIA-ECB block encryption/decryption
+ * \brief          Perform a CAMELLIA-ECB block encryption/decryption operation.
  *
- * \param ctx      CAMELLIA context
- * \param mode     MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
- * \param input    16-byte input block
- * \param output   16-byte output block
+ * \param ctx      The CAMELLIA context to use. This must be initialized
+ *                 and bound to a key.
+ * \param mode     The mode of operation. This must be either
+ *                 #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
+ * \param input    The input block. This must be a readable buffer
+ *                 of size \c 16 Bytes.
+ * \param output   The output block. This must be a writable buffer
+ *                 of size \c 16 Bytes.
  *
- * \return         0 if successful
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_camellia_crypt_ecb( mbedtls_camellia_context *ctx,
                     int mode,
@@ -120,9 +142,7 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_CBC)
 /**
- * \brief          CAMELLIA-CBC buffer encryption/decryption
- *                 Length should be a multiple of the block
- *                 size (16 bytes)
+ * \brief          Perform a CAMELLIA-CBC buffer encryption/decryption operation.
  *
  * \note           Upon exit, the content of the IV is updated so that you can
  *                 call the function same function again on the following
@@ -132,15 +152,22 @@
  *                 IV, you should either save it manually or use the cipher
  *                 module instead.
  *
- * \param ctx      CAMELLIA context
- * \param mode     MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
- * \param length   length of the input data
- * \param iv       initialization vector (updated after use)
- * \param input    buffer holding the input data
- * \param output   buffer holding the output data
+ * \param ctx      The CAMELLIA context to use. This must be initialized
+ *                 and bound to a key.
+ * \param mode     The mode of operation. This must be either
+ *                 #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
+ * \param length   The length in Bytes of the input data \p input.
+ *                 This must be a multiple of \c 16 Bytes.
+ * \param iv       The initialization vector. This must be a read/write buffer
+ *                 of length \c 16 Bytes. It is updated to allow streaming
+ *                 use as explained above.
+ * \param input    The buffer holding the input data. This must point to a
+ *                 readable buffer of length \p length Bytes.
+ * \param output   The buffer holding the output data. This must point to a
+ *                 writable buffer of length \p length Bytes.
  *
- * \return         0 if successful, or
- *                 MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_camellia_crypt_cbc( mbedtls_camellia_context *ctx,
                     int mode,
@@ -152,11 +179,14 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_CFB)
 /**
- * \brief          CAMELLIA-CFB128 buffer encryption/decryption
+ * \brief          Perform a CAMELLIA-CFB128 buffer encryption/decryption
+ *                 operation.
  *
- * Note: Due to the nature of CFB you should use the same key schedule for
- * both encryption and decryption. So a context initialized with
- * mbedtls_camellia_setkey_enc() for both MBEDTLS_CAMELLIA_ENCRYPT and CAMELLIE_DECRYPT.
+ * \note           Due to the nature of CFB mode, you should use the same
+ *                 key for both encryption and decryption. In particular, calls
+ *                 to this function should be preceded by a key-schedule via
+ *                 mbedtls_camellia_setkey_enc() regardless of whether \p mode
+ *                 is #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
  *
  * \note           Upon exit, the content of the IV is updated so that you can
  *                 call the function same function again on the following
@@ -166,16 +196,24 @@
  *                 IV, you should either save it manually or use the cipher
  *                 module instead.
  *
- * \param ctx      CAMELLIA context
- * \param mode     MBEDTLS_CAMELLIA_ENCRYPT or MBEDTLS_CAMELLIA_DECRYPT
- * \param length   length of the input data
- * \param iv_off   offset in IV (updated after use)
- * \param iv       initialization vector (updated after use)
- * \param input    buffer holding the input data
- * \param output   buffer holding the output data
+ * \param ctx      The CAMELLIA context to use. This must be initialized
+ *                 and bound to a key.
+ * \param mode     The mode of operation. This must be either
+ *                 #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
+ * \param length   The length of the input data \p input. Any value is allowed.
+ * \param iv_off   The current offset in the IV. This must be smaller
+ *                 than \c 16 Bytes. It is updated after this call to allow
+ *                 the aforementioned streaming usage.
+ * \param iv       The initialization vector. This must be a read/write buffer
+ *                 of length \c 16 Bytes. It is updated after this call to
+ *                 allow the aforementioned streaming usage.
+ * \param input    The buffer holding the input data. This must be a readable
+ *                 buffer of size \p length Bytes.
+ * \param output   The buffer to hold the output data. This must be a writable
+ *                 buffer of length \p length Bytes.
  *
- * \return         0 if successful, or
- *                 MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
+ * \return         \c 0 if successful.
+ * \return         A negative error code on failure.
  */
 int mbedtls_camellia_crypt_cfb128( mbedtls_camellia_context *ctx,
                        int mode,
@@ -188,11 +226,13 @@
 
 #if defined(MBEDTLS_CIPHER_MODE_CTR)
 /**
- * \brief               CAMELLIA-CTR buffer encryption/decryption
+ * \brief      Perform a CAMELLIA-CTR buffer encryption/decryption operation.
  *
- * Note: Due to the nature of CTR you should use the same key schedule for
- * both encryption and decryption. So a context initialized with
- * mbedtls_camellia_setkey_enc() for both MBEDTLS_CAMELLIA_ENCRYPT and MBEDTLS_CAMELLIA_DECRYPT.
+ * *note       Due to the nature of CTR mode, you should use the same
+ *             key for both encryption and decryption. In particular, calls
+ *             to this function should be preceded by a key-schedule via
+ *             mbedtls_camellia_setkey_enc() regardless of whether \p mode
+ *             is #MBEDTLS_CAMELLIA_ENCRYPT or #MBEDTLS_CAMELLIA_DECRYPT.
  *
  * \warning    You must never reuse a nonce value with the same key. Doing so
  *             would void the encryption for the two messages encrypted with
@@ -215,41 +255,49 @@
  *             per-message nonce, handled by yourself, and the second one
  *             updated by this function internally.
  *
- *             For example, you might reserve the first 12 bytes for the
- *             per-message nonce, and the last 4 bytes for internal use. In that
- *             case, before calling this function on a new message you need to
- *             set the first 12 bytes of \p nonce_counter to your chosen nonce
- *             value, the last 4 to 0, and \p nc_off to 0 (which will cause \p
- *             stream_block to be ignored). That way, you can encrypt at most
- *             2**96 messages of up to 2**32 blocks each with the same key.
+ *             For example, you might reserve the first \c 12 Bytes for the
+ *             per-message nonce, and the last \c 4 Bytes for internal use.
+ *             In that case, before calling this function on a new message you
+ *             need to set the first \c 12 Bytes of \p nonce_counter to your
+ *             chosen nonce value, the last four to \c 0, and \p nc_off to \c 0
+ *             (which will cause \p stream_block to be ignored). That way, you
+ *             can encrypt at most \c 2**96 messages of up to \c 2**32 blocks
+ *             each  with the same key.
  *
  *             The per-message nonce (or information sufficient to reconstruct
- *             it) needs to be communicated with the ciphertext and must be unique.
- *             The recommended way to ensure uniqueness is to use a message
- *             counter. An alternative is to generate random nonces, but this
- *             limits the number of messages that can be securely encrypted:
- *             for example, with 96-bit random nonces, you should not encrypt
- *             more than 2**32 messages with the same key.
+ *             it) needs to be communicated with the ciphertext and must be
+ *             unique. The recommended way to ensure uniqueness is to use a
+ *             message counter. An alternative is to generate random nonces,
+ *             but this limits the number of messages that can be securely
+ *             encrypted: for example, with 96-bit random nonces, you should
+ *             not encrypt more than 2**32 messages with the same key.
  *
  *             Note that for both stategies, sizes are measured in blocks and
- *             that a CAMELLIA block is 16 bytes.
+ *             that a CAMELLIA block is \c 16 Bytes.
  *
  * \warning    Upon return, \p stream_block contains sensitive data. Its
  *             content must not be written to insecure storage and should be
  *             securely discarded as soon as it's no longer needed.
  *
- * \param ctx           CAMELLIA context
- * \param length        The length of the data
- * \param nc_off        The offset in the current stream_block (for resuming
+ * \param ctx           The CAMELLIA context to use. This must be initialized
+ *                      and bound to a key.
+ * \param length        The length of the input data \p input in Bytes.
+ *                      Any value is allowed.
+ * \param nc_off        The offset in the current \p stream_block (for resuming
  *                      within current cipher stream). The offset pointer to
- *                      should be 0 at the start of a stream.
- * \param nonce_counter The 128-bit nonce and counter.
- * \param stream_block  The saved stream-block for resuming. Is overwritten
- *                      by the function.
- * \param input         The input data stream
- * \param output        The output data stream
+ *                      should be \c 0 at the start of a stream. It is updated
+ *                      at the end of this call.
+ * \param nonce_counter The 128-bit nonce and counter. This must be a read/write
+ *                      buffer of length \c 16 Bytes.
+ * \param stream_block  The saved stream-block for resuming. This must be a
+ *                      read/write buffer of length \c 16 Bytes.
+ * \param input         The input data stream. This must be a readable buffer of
+ *                      size \p length Bytes.
+ * \param output        The output data stream. This must be a writable buffer
+ *                      of size \p length Bytes.
  *
- * \return         0 if successful
+ * \return              \c 0 if successful.
+ * \return              A negative error code on failure.
  */
 int mbedtls_camellia_crypt_ctr( mbedtls_camellia_context *ctx,
                        size_t length,
diff --git a/include/mbedtls/ccm.h b/include/mbedtls/ccm.h
index dfb1b5e..3f6b8f6 100644
--- a/include/mbedtls/ccm.h
+++ b/include/mbedtls/ccm.h
@@ -57,7 +57,6 @@
 /* MBEDTLS_ERR_CCM_HW_ACCEL_FAILED is deprecated and should not be used. */
 #define MBEDTLS_ERR_CCM_HW_ACCEL_FAILED -0x0011 /**< CCM hardware accelerator failed. */
 
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -85,7 +84,7 @@
  *                  to make references valid, and prepare the context
  *                  for mbedtls_ccm_setkey() or mbedtls_ccm_free().
  *
- * \param ctx       The CCM context to initialize.
+ * \param ctx       The CCM context to initialize. This must not be \c NULL.
  */
 void mbedtls_ccm_init( mbedtls_ccm_context *ctx );
 
@@ -93,9 +92,10 @@
  * \brief           This function initializes the CCM context set in the
  *                  \p ctx parameter and sets the encryption key.
  *
- * \param ctx       The CCM context to initialize.
+ * \param ctx       The CCM context to initialize. This must be an initialized
+ *                  context.
  * \param cipher    The 128-bit block cipher to use.
- * \param key       The encryption key.
+ * \param key       The encryption key. This must not be \c NULL.
  * \param keybits   The key size in bits. This must be acceptable by the cipher.
  *
  * \return          \c 0 on success.
@@ -110,7 +110,8 @@
  * \brief   This function releases and clears the specified CCM context
  *          and underlying cipher sub-context.
  *
- * \param ctx       The CCM context to clear.
+ * \param ctx       The CCM context to clear. If this is \c NULL, the function
+ *                  has no effect. Otherwise, this must be initialized.
  */
 void mbedtls_ccm_free( mbedtls_ccm_context *ctx );
 
@@ -123,19 +124,27 @@
  *                  \p tag = \p output + \p length, and make sure that the
  *                  output buffer is at least \p length + \p tag_len wide.
  *
- * \param ctx       The CCM context to use for encryption.
+ * \param ctx       The CCM context to use for encryption. This must be
+ *                  initialized and bound to a key.
  * \param length    The length of the input data in Bytes.
- * \param iv        Initialization vector (nonce).
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
  * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
  *                  or 13. The length L of the message length field is
  *                  15 - \p iv_len.
- * \param add       The additional data field.
+ * \param add       The additional data field. If \p add_len is greater than
+ *                  zero, \p add must be a readable buffer of at least that
+ *                  length.
  * \param add_len   The length of additional data in Bytes.
- *                  Must be less than 2^16 - 2^8.
- * \param input     The buffer holding the input data.
- * \param output    The buffer holding the output data.
- *                  Must be at least \p length Bytes wide.
- * \param tag       The buffer holding the authentication field.
+ *                  This must be less than `2^16 - 2^8`.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
  * \param tag_len   The length of the authentication field to generate in Bytes:
  *                  4, 6, 8, 10, 12, 14 or 16.
  *
@@ -161,23 +170,30 @@
  *                  the tag length has to be encoded into the \p iv passed to
  *                  this function.
  *
- * \param ctx       The CCM context to use for encryption.
+ * \param ctx       The CCM context to use for encryption. This must be
+ *                  initialized and bound to a key.
  * \param length    The length of the input data in Bytes.
- * \param iv        Initialization vector (nonce).
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
  * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
  *                  or 13. The length L of the message length field is
  *                  15 - \p iv_len.
- * \param add       The additional data field.
+ * \param add       The additional data field. This must be a readable buffer of
+ *                  at least \p add_len Bytes.
  * \param add_len   The length of additional data in Bytes.
- *                  Must be less than 2^16 - 2^8.
- * \param input     The buffer holding the input data.
- * \param output    The buffer holding the output data.
- *                  Must be at least \p length Bytes wide.
- * \param tag       The buffer holding the authentication field.
+ *                  This must be less than 2^16 - 2^8.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
  * \param tag_len   The length of the authentication field to generate in Bytes:
  *                  0, 4, 6, 8, 10, 12, 14 or 16.
  *
- * \warning         Passing 0 as \p tag_len means that the message is no
+ * \warning         Passing \c 0 as \p tag_len means that the message is no
  *                  longer authenticated.
  *
  * \return          \c 0 on success.
@@ -193,20 +209,27 @@
  * \brief           This function performs a CCM authenticated decryption of a
  *                  buffer.
  *
- * \param ctx       The CCM context to use for decryption.
+ * \param ctx       The CCM context to use for decryption. This must be
+ *                  initialized and bound to a key.
  * \param length    The length of the input data in Bytes.
- * \param iv        Initialization vector (nonce).
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
  * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
  *                  or 13. The length L of the message length field is
  *                  15 - \p iv_len.
- * \param add       The additional data field.
+ * \param add       The additional data field. This must be a readable buffer
+ *                  of at least that \p add_len Bytes..
  * \param add_len   The length of additional data in Bytes.
- *                  Must be less than 2^16 - 2^8.
- * \param input     The buffer holding the input data.
- * \param output    The buffer holding the output data.
- *                  Must be at least \p length Bytes wide.
- * \param tag       The buffer holding the authentication field.
- * \param tag_len   The length of the authentication field in Bytes.
+ *                  This must be less than 2^16 - 2^8.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
+ * \param tag_len   The length of the authentication field to generate in Bytes:
  *                  4, 6, 8, 10, 12, 14 or 16.
  *
  * \return          \c 0 on success. This indicates that the message is authentic.
@@ -228,23 +251,30 @@
  *                  this function as \p tag_len. (\p tag needs to be adjusted
  *                  accordingly.)
  *
- * \param ctx       The CCM context to use for decryption.
+ * \param ctx       The CCM context to use for decryption. This must be
+ *                  initialized and bound to a key.
  * \param length    The length of the input data in Bytes.
- * \param iv        Initialization vector (nonce).
+ * \param iv        The initialization vector (nonce). This must be a readable
+ *                  buffer of at least \p iv_len Bytes.
  * \param iv_len    The length of the nonce in Bytes: 7, 8, 9, 10, 11, 12,
  *                  or 13. The length L of the message length field is
  *                  15 - \p iv_len.
- * \param add       The additional data field.
+ * \param add       The additional data field. This must be a readable buffer of
+ *                  at least that \p add_len Bytes.
  * \param add_len   The length of additional data in Bytes.
- *                  Must be less than 2^16 - 2^8.
- * \param input     The buffer holding the input data.
- * \param output    The buffer holding the output data.
- *                  Must be at least \p length Bytes wide.
- * \param tag       The buffer holding the authentication field.
+ *                  This must be less than 2^16 - 2^8.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, \p input must be a readable buffer of at least
+ *                  that length.
+ * \param output    The buffer holding the output data. If \p length is greater
+ *                  than zero, \p output must be a writable buffer of at least
+ *                  that length.
+ * \param tag       The buffer holding the authentication field. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
  * \param tag_len   The length of the authentication field in Bytes.
  *                  0, 4, 6, 8, 10, 12, 14 or 16.
  *
- * \warning         Passing 0 as \p tag_len means that the message is no
+ * \warning         Passing \c 0 as \p tag_len means that the message is nos
  *                  longer authenticated.
  *
  * \return          \c 0 on success.
diff --git a/include/mbedtls/dhm.h b/include/mbedtls/dhm.h
index 8e2d020..a5452c1 100644
--- a/include/mbedtls/dhm.h
+++ b/include/mbedtls/dhm.h
@@ -127,9 +127,15 @@
 void mbedtls_dhm_init( mbedtls_dhm_context *ctx );
 
 /**
- * \brief          This function parses the ServerKeyExchange parameters.
+ * \brief          This function parses the DHM parameters in a
+ *                 TLS ServerKeyExchange handshake message
+ *                 (DHM modulus, generator, and public key).
  *
- * \param ctx      The DHM context.
+ * \note           In a TLS handshake, this is the how the client
+ *                 sets up its DHM context from the server's public
+ *                 DHM key material.
+ *
+ * \param ctx      The DHM context to use. This must be initialized.
  * \param p        On input, *p must be the start of the input buffer.
  *                 On output, *p is updated to point to the end of the data
  *                 that has been read. On success, this is the first byte
@@ -143,31 +149,37 @@
  * \return         An \c MBEDTLS_ERR_DHM_XXX error code on failure.
  */
 int mbedtls_dhm_read_params( mbedtls_dhm_context *ctx,
-                     unsigned char **p,
-                     const unsigned char *end );
+                             unsigned char **p,
+                             const unsigned char *end );
 
 /**
- * \brief          This function sets up and writes the ServerKeyExchange
- *                 parameters.
+ * \brief          This function generates a DHM key pair and exports its
+ *                 public part together with the DHM parameters in the format
+ *                 used in a TLS ServerKeyExchange handshake message.
  *
- * \note           The destination buffer must be large enough to hold
- *                 the reduced binary presentation of the modulus, the generator
- *                 and the public key, each wrapped with a 2-byte length field.
- *                 It is the responsibility of the caller to ensure that enough
- *                 space is available. Refer to \c mbedtls_mpi_size to computing
- *                 the byte-size of an MPI.
- *
- * \note           This function assumes that \c ctx->P and \c ctx->G
- *                 have already been properly set. For that, use
+ * \note           This function assumes that the DHM parameters \c ctx->P
+ *                 and \c ctx->G have already been properly set. For that, use
  *                 mbedtls_dhm_set_group() below in conjunction with
  *                 mbedtls_mpi_read_binary() and mbedtls_mpi_read_string().
  *
- * \param ctx      The DHM context.
+ * \note           In a TLS handshake, this is the how the server generates
+ *                 and exports its DHM key material.
+ *
+ * \param ctx      The DHM context to use. This must be initialized
+ *                 and have the DHM parameters set. It may or may not
+ *                 already have imported the peer's public key.
  * \param x_size   The private key size in Bytes.
- * \param olen     The number of characters written.
- * \param output   The destination buffer.
- * \param f_rng    The RNG function.
- * \param p_rng    The RNG context.
+ * \param olen     The address at which to store the number of Bytes
+ *                 written on success. This must not be \c NULL.
+ * \param output   The destination buffer. This must be a writable buffer of
+ *                 sufficient size to hold the reduced binary presentation of
+ *                 the modulus, the generator and the public key, each wrapped
+ *                 with a 2-byte length field. It is the responsibility of the
+ *                 caller to ensure that enough space is available. Refer to
+ *                 mbedtls_mpi_size() to computing the byte-size of an MPI.
+ * \param f_rng    The RNG function. Must not be \c NULL.
+ * \param p_rng    The RNG context to be passed to \p f_rng. This may be
+ *                 \c NULL if \p f_rng doesn't need a context parameter.
  *
  * \return         \c 0 on success.
  * \return         An \c MBEDTLS_ERR_DHM_XXX error code on failure.
@@ -180,12 +192,14 @@
 /**
  * \brief          This function sets the prime modulus and generator.
  *
- * \note           This function can be used to set \p P, \p G
+ * \note           This function can be used to set \c ctx->P, \c ctx->G
  *                 in preparation for mbedtls_dhm_make_params().
  *
- * \param ctx      The DHM context.
- * \param P        The MPI holding the DHM prime modulus.
- * \param G        The MPI holding the DHM generator.
+ * \param ctx      The DHM context to configure. This must be initialized.
+ * \param P        The MPI holding the DHM prime modulus. This must be
+ *                 an initialized MPI.
+ * \param G        The MPI holding the DHM generator. This must be an
+ *                 initialized MPI.
  *
  * \return         \c 0 if successful.
  * \return         An \c MBEDTLS_ERR_DHM_XXX error code on failure.
@@ -195,11 +209,17 @@
                            const mbedtls_mpi *G );
 
 /**
- * \brief          This function imports the public value of the peer, G^Y.
+ * \brief          This function imports the raw public value of the peer.
  *
- * \param ctx      The DHM context.
- * \param input    The input buffer containing the G^Y value of the peer.
- * \param ilen     The size of the input buffer.
+ * \note           In a TLS handshake, this is the how the server imports
+ *                 the Client's public DHM key.
+ *
+ * \param ctx      The DHM context to use. This must be initialized and have
+ *                 its DHM parameters set, e.g. via mbedtls_dhm_set_group().
+ *                 It may or may not already have generated its own private key.
+ * \param input    The input buffer containing the \c G^Y value of the peer.
+ *                 This must be a readable buffer of size \p ilen Bytes.
+ * \param ilen     The size of the input buffer \p input in Bytes.
  *
  * \return         \c 0 on success.
  * \return         An \c MBEDTLS_ERR_DHM_XXX error code on failure.
@@ -208,21 +228,25 @@
                      const unsigned char *input, size_t ilen );
 
 /**
- * \brief          This function creates its own private key, \c X, and
- *                 exports \c G^X.
+ * \brief          This function creates a DHM key pair and exports
+ *                 the raw public key in big-endian format.
  *
  * \note           The destination buffer is always fully written
  *                 so as to contain a big-endian representation of G^X mod P.
- *                 If it is larger than ctx->len, it is padded accordingly
+ *                 If it is larger than \c ctx->len, it is padded accordingly
  *                 with zero-bytes at the beginning.
  *
- * \param ctx      The DHM context.
+ * \param ctx      The DHM context to use. This must be initialized and
+ *                 have the DHM parameters set. It may or may not already
+ *                 have imported the peer's public key.
  * \param x_size   The private key size in Bytes.
- * \param output   The destination buffer.
- * \param olen     The length of the destination buffer. Must be at least
- *                  equal to ctx->len (the size of \c P).
- * \param f_rng    The RNG function.
- * \param p_rng    The RNG context.
+ * \param output   The destination buffer. This must be a writable buffer of
+ *                 size \p olen Bytes.
+ * \param olen     The length of the destination buffer. This must be at least
+ *                 equal to `ctx->len` (the size of \c P).
+ * \param f_rng    The RNG function. This must not be \c NULL.
+ * \param p_rng    The RNG context to be passed to \p f_rng. This may be \c NULL
+ *                 if \p f_rng doesn't need a context argument.
  *
  * \return         \c 0 on success.
  * \return         An \c MBEDTLS_ERR_DHM_XXX error code on failure.
@@ -233,22 +257,27 @@
                      void *p_rng );
 
 /**
- * \brief               This function derives and exports the shared secret
- *                      \c (G^Y)^X mod \c P.
+ * \brief          This function derives and exports the shared secret
+ *                 \c (G^Y)^X mod \c P.
  *
- * \note                If \p f_rng is not NULL, it is used to blind the input as
- *                      a countermeasure against timing attacks. Blinding is used
- *                      only if our private key \c X is re-used, and not used
- *                      otherwise. We recommend always passing a non-NULL
- *                      \p f_rng argument.
+ * \note           If \p f_rng is not \c NULL, it is used to blind the input as
+ *                 a countermeasure against timing attacks. Blinding is used
+ *                 only if our private key \c X is re-used, and not used
+ *                 otherwise. We recommend always passing a non-NULL
+ *                 \p f_rng argument.
  *
- * \param ctx           The DHM context.
- * \param output        The destination buffer.
- * \param output_size   The size of the destination buffer. Must be at least
- *                      the size of ctx->len (the size of \c P).
+ * \param ctx           The DHM context to use. This must be initialized
+ *                      and have its own private key generated and the peer's
+ *                      public key imported.
+ * \param output        The buffer to write the generated shared key to. This
+ *                      must be a writable buffer of size \p output_size Bytes.
+ * \param output_size   The size of the destination buffer. This must be at
+ *                      least the size of \c ctx->len (the size of \c P).
  * \param olen          On exit, holds the actual number of Bytes written.
- * \param f_rng         The RNG function, for blinding purposes.
- * \param p_rng         The RNG context.
+ * \param f_rng         The RNG function, for blinding purposes. This may
+ *                      b \c NULL if blinding isn't needed.
+ * \param p_rng         The RNG context. This may be \c NULL if \p f_rng
+ *                      doesn't need a context argument.
  *
  * \return              \c 0 on success.
  * \return              An \c MBEDTLS_ERR_DHM_XXX error code on failure.
@@ -259,9 +288,12 @@
                      void *p_rng );
 
 /**
- * \brief          This function frees and clears the components of a DHM context.
+ * \brief          This function frees and clears the components
+ *                 of a DHM context.
  *
- * \param ctx      The DHM context to free and clear.
+ * \param ctx      The DHM context to free and clear. This may be \c NULL,
+ *                 in which case this function is a no-op. If it is not \c NULL,
+ *                 it must point to an initialized DHM context.
  */
 void mbedtls_dhm_free( mbedtls_dhm_context *ctx );
 
@@ -270,17 +302,19 @@
 /**
  * \brief             This function parses DHM parameters in PEM or DER format.
  *
- * \param dhm         The DHM context to initialize.
- * \param dhmin       The input buffer.
- * \param dhminlen    The size of the buffer, including the terminating null
- *                    Byte for PEM data.
+ * \param dhm         The DHM context to import the DHM parameters into.
+ *                    This must be initialized.
+ * \param dhmin       The input buffer. This must be a readable buffer of
+ *                    length \p dhminlen Bytes.
+ * \param dhminlen    The size of the input buffer \p dhmin, including the
+ *                    terminating \c NULL Byte for PEM data.
  *
  * \return            \c 0 on success.
- * \return            An \c MBEDTLS_ERR_DHM_XXX or \c MBEDTLS_ERR_PEM_XXX error code
- *                    error code on failure.
+ * \return            An \c MBEDTLS_ERR_DHM_XXX or \c MBEDTLS_ERR_PEM_XXX error
+ *                    code on failure.
  */
 int mbedtls_dhm_parse_dhm( mbedtls_dhm_context *dhm, const unsigned char *dhmin,
-                   size_t dhminlen );
+                           size_t dhminlen );
 
 #if defined(MBEDTLS_FS_IO)
 /** \ingroup x509_module */
@@ -288,11 +322,13 @@
  * \brief          This function loads and parses DHM parameters from a file.
  *
  * \param dhm      The DHM context to load the parameters to.
+ *                 This must be initialized.
  * \param path     The filename to read the DHM parameters from.
+ *                 This must not be \c NULL.
  *
  * \return         \c 0 on success.
- * \return            An \c MBEDTLS_ERR_DHM_XXX or \c MBEDTLS_ERR_PEM_XXX error code
- *                    error code on failure.
+ * \return         An \c MBEDTLS_ERR_DHM_XXX or \c MBEDTLS_ERR_PEM_XXX
+ *                 error code on failure.
  */
 int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path );
 #endif /* MBEDTLS_FS_IO */
@@ -353,15 +389,6 @@
 
 #if !defined(MBEDTLS_DEPRECATED_REMOVED)
 
-#if defined(MBEDTLS_DEPRECATED_WARNING)
-#define MBEDTLS_DEPRECATED __attribute__((deprecated))
-MBEDTLS_DEPRECATED typedef char const * mbedtls_deprecated_constant_t;
-#define MBEDTLS_DEPRECATED_STRING_CONSTANT( VAL )       \
-    ( (mbedtls_deprecated_constant_t) ( VAL ) )
-#else
-#define MBEDTLS_DEPRECATED_STRING_CONSTANT( VAL ) VAL
-#endif /* ! MBEDTLS_DEPRECATED_WARNING */
-
 /**
  * \warning The origin of the primes in RFC 5114 is not documented and
  *          their use therefore constitutes a security risk!
diff --git a/include/mbedtls/ecp.h b/include/mbedtls/ecp.h
index 1c37298..de3a343 100644
--- a/include/mbedtls/ecp.h
+++ b/include/mbedtls/ecp.h
@@ -497,24 +497,37 @@
 
 /**
  * \brief           This function frees the components of an ECP group.
- * \param grp       The group to free.
+ *
+ * \param grp       The group to free. This may be \c NULL, in which
+ *                  case this function returns immediately. If it is not
+ *                  \c NULL, it must point to an initialized ECP group.
  */
 void mbedtls_ecp_group_free( mbedtls_ecp_group *grp );
 
 /**
  * \brief           This function frees the components of a key pair.
- * \param key       The key pair to free.
+ *
+ * \param key       The key pair to free. This may be \c NULL, in which
+ *                  case this function returns immediately. If it is not
+ *                  \c NULL, it must point to an initialized ECP key pair.
  */
 void mbedtls_ecp_keypair_free( mbedtls_ecp_keypair *key );
 
 #if defined(MBEDTLS_ECP_RESTARTABLE)
 /**
- * \brief           Initialize a restart context
+ * \brief           Initialize a restart context.
+ *
+ * \param ctx       The restart context to initialize. This must
+ *                  not be \c NULL.
  */
 void mbedtls_ecp_restart_init( mbedtls_ecp_restart_ctx *ctx );
 
 /**
- * \brief           Free the components of a restart context
+ * \brief           Free the components of a restart context.
+ *
+ * \param ctx       The restart context to free. This may be \c NULL, in which
+ *                  case this function returns immediately. If it is not
+ *                  \c NULL, it must point to an initialized restart context.
  */
 void mbedtls_ecp_restart_free( mbedtls_ecp_restart_ctx *ctx );
 #endif /* MBEDTLS_ECP_RESTARTABLE */
@@ -523,11 +536,12 @@
  * \brief           This function copies the contents of point \p Q into
  *                  point \p P.
  *
- * \param P         The destination point.
- * \param Q         The source point.
+ * \param P         The destination point. This must be initialized.
+ * \param Q         The source point. This must be initialized.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
+ * \return          Another negative error code for other kinds of failure.
  */
 int mbedtls_ecp_copy( mbedtls_ecp_point *P, const mbedtls_ecp_point *Q );
 
@@ -535,31 +549,35 @@
  * \brief           This function copies the contents of group \p src into
  *                  group \p dst.
  *
- * \param dst       The destination group.
- * \param src       The source group.
+ * \param dst       The destination group. This must be initialized.
+ * \param src       The source group. This must be initialized.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
+ * \return          Another negative error code on other kinds of failure.
  */
-int mbedtls_ecp_group_copy( mbedtls_ecp_group *dst, const mbedtls_ecp_group *src );
+int mbedtls_ecp_group_copy( mbedtls_ecp_group *dst,
+                            const mbedtls_ecp_group *src );
 
 /**
- * \brief           This function sets a point to zero.
+ * \brief           This function sets a point to the point at infinity.
  *
- * \param pt        The point to set.
+ * \param pt        The point to set. This must be initialized.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_set_zero( mbedtls_ecp_point *pt );
 
 /**
- * \brief           This function checks if a point is zero.
+ * \brief           This function checks if a point is the point at infinity.
  *
- * \param pt        The point to test.
+ * \param pt        The point to test. This must be initialized.
  *
  * \return          \c 1 if the point is zero.
  * \return          \c 0 if the point is non-zero.
+ * \return          A negative error code on failure.
  */
 int mbedtls_ecp_is_zero( mbedtls_ecp_point *pt );
 
@@ -569,8 +587,8 @@
  * \note            This assumes that the points are normalized. Otherwise,
  *                  they may compare as "not equal" even if they are.
  *
- * \param P         The first point to compare.
- * \param Q         The second point to compare.
+ * \param P         The first point to compare. This must be initialized.
+ * \param Q         The second point to compare. This must be initialized.
  *
  * \return          \c 0 if the points are equal.
  * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the points are not equal.
@@ -582,7 +600,7 @@
  * \brief           This function imports a non-zero point from two ASCII
  *                  strings.
  *
- * \param P         The destination point.
+ * \param P         The destination point. This must be initialized.
  * \param radix     The numeric base of the input.
  * \param x         The first affine coordinate, as a null-terminated string.
  * \param y         The second affine coordinate, as a null-terminated string.
@@ -597,15 +615,21 @@
  * \brief           This function exports a point into unsigned binary data.
  *
  * \param grp       The group to which the point should belong.
- * \param P         The point to export.
- * \param format    The point format. Should be an \c MBEDTLS_ECP_PF_XXX macro.
- * \param olen      The length of the output.
- * \param buf       The output buffer.
- * \param buflen    The length of the output buffer.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param P         The point to export. This must be initialized.
+ * \param format    The point format. This must be either
+ *                  #MBEDTLS_ECP_PF_COMPRESSED or #MBEDTLS_ECP_PF_UNCOMPRESSED.
+ * \param olen      The address at which to store the length of
+ *                  the output in Bytes. This must not be \c NULL.
+ * \param buf       The output buffer. This must be a writable buffer
+ *                  of length \p buflen Bytes.
+ * \param buflen    The length of the output buffer \p buf in Bytes.
  *
  * \return          \c 0 on success.
- * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA
- *                  or #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL on failure.
+ * \return          #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the output buffer
+ *                  is too small to hold the point.
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *P,
                             int format, size_t *olen,
@@ -619,19 +643,23 @@
  *                  for that.
  *
  * \param grp       The group to which the point should belong.
- * \param P         The point to import.
- * \param buf       The input buffer.
- * \param ilen      The length of the input.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param P         The destination context to import the point to.
+ *                  This must be initialized.
+ * \param buf       The input buffer. This must be a readable buffer
+ *                  of length \p ilen Bytes.
+ * \param ilen      The length of the input buffer \p buf in Bytes.
  *
  * \return          \c 0 on success.
- * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if input is invalid.
+ * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the input is invalid.
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
  * \return          #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the point format
  *                  is not implemented.
- *
  */
-int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp, mbedtls_ecp_point *P,
-                           const unsigned char *buf, size_t ilen );
+int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp,
+                                   mbedtls_ecp_point *P,
+                                   const unsigned char *buf, size_t ilen );
 
 /**
  * \brief           This function imports a point from a TLS ECPoint record.
@@ -639,7 +667,9 @@
  * \note            On function return, \p *buf is updated to point immediately
  *                  after the ECPoint record.
  *
- * \param grp       The ECP group used.
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
  * \param pt        The destination point.
  * \param buf       The address of the pointer to the start of the input buffer.
  * \param len       The length of the buffer.
@@ -649,99 +679,122 @@
  *                  failure.
  * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if input is invalid.
  */
-int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt,
-                        const unsigned char **buf, size_t len );
+int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp,
+                                mbedtls_ecp_point *pt,
+                                const unsigned char **buf, size_t len );
 
 /**
- * \brief           This function exports a point as a TLS ECPoint record.
+ * \brief           This function exports a point as a TLS ECPoint record
+ *                  defined in RFC 4492, Section 5.4.
  *
- * \param grp       The ECP group used.
- * \param pt        The point format to export to. The point format is an
- *                  \c MBEDTLS_ECP_PF_XXX constant.
- * \param format    The export format.
- * \param olen      The length of the data written.
- * \param buf       The buffer to write to.
- * \param blen      The length of the buffer.
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param pt        The point to be exported. This must be initialized.
+ * \param format    The point format to use. This must be either
+ *                  #MBEDTLS_ECP_PF_COMPRESSED or #MBEDTLS_ECP_PF_UNCOMPRESSED.
+ * \param olen      The address at which to store the length in Bytes
+ *                  of the data written.
+ * \param buf       The target buffer. This must be a writable buffer of
+ *                  length \p blen Bytes.
+ * \param blen      The length of the target buffer \p buf in Bytes.
  *
  * \return          \c 0 on success.
- * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA or
- *                  #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL on failure.
+ * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the input is invalid.
+ * \return          #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the target buffer
+ *                  is too small to hold the exported point.
+ * \return          Another negative error code on other kinds of failure.
  */
-int mbedtls_ecp_tls_write_point( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *pt,
-                         int format, size_t *olen,
-                         unsigned char *buf, size_t blen );
+int mbedtls_ecp_tls_write_point( const mbedtls_ecp_group *grp,
+                                 const mbedtls_ecp_point *pt,
+                                 int format, size_t *olen,
+                                 unsigned char *buf, size_t blen );
 
 /**
- * \brief           This function sets a group using standardized domain parameters.
+ * \brief           This function sets up an ECP group context
+ *                  from a standardized set of domain parameters.
  *
  * \note            The index should be a value of the NamedCurve enum,
  *                  as defined in <em>RFC-4492: Elliptic Curve Cryptography
  *                  (ECC) Cipher Suites for Transport Layer Security (TLS)</em>,
  *                  usually in the form of an \c MBEDTLS_ECP_DP_XXX macro.
  *
- * \param grp       The destination group.
+ * \param grp       The group context to setup. This must be initialized.
  * \param id        The identifier of the domain parameter set to load.
  *
- * \return          \c 0 on success,
- * \return          An \c MBEDTLS_ERR_MPI_XXX error code on initialization failure.
- * \return          #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE for unkownn groups.
-
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if \p id doesn't
+ *                  correspond to a known group.
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_group_load( mbedtls_ecp_group *grp, mbedtls_ecp_group_id id );
 
 /**
- * \brief           This function sets a group from a TLS ECParameters record.
+ * \brief           This function sets up an ECP group context from a TLS
+ *                  ECParameters record as defined in RFC 4492, Section 5.4.
  *
- * \note            \p buf is updated to point right after the ECParameters
- *                  record on exit.
+ * \note            The read pointer \p buf is updated to point right after
+ *                  the ECParameters record on exit.
  *
- * \param grp       The destination group.
+ * \param grp       The group context to setup. This must be initialized.
  * \param buf       The address of the pointer to the start of the input buffer.
- * \param len       The length of the buffer.
+ * \param len       The length of the input buffer \c *buf in Bytes.
  *
  * \return          \c 0 on success.
- * \return          An \c MBEDTLS_ERR_MPI_XXX error code on initialization
- *                  failure.
  * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if input is invalid.
  * \return          #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the group is not
- *                  recognised.
+ *                  recognized.
+ * \return          Another negative error code on other kinds of failure.
  */
-int mbedtls_ecp_tls_read_group( mbedtls_ecp_group *grp, const unsigned char **buf, size_t len );
+int mbedtls_ecp_tls_read_group( mbedtls_ecp_group *grp,
+                                const unsigned char **buf, size_t len );
 
 /**
- * \brief           This function reads a group from a TLS ECParameters record.
+ * \brief           This function extracts an elliptic curve group ID from a
+ *                  TLS ECParameters record as defined in RFC 4492, Section 5.4.
  *
- * \note            \p buf is updated to point right after the ECParameters
- *                  record on exit.
+ * \note            The read pointer \p buf is updated to point right after
+ *                  the ECParameters record on exit.
  *
- * \param grp       Output parameter to hold the group id.
+ * \param grp       The address at which to store the group id.
+ *                  This must not be \c NULL.
  * \param buf       The address of the pointer to the start of the input buffer.
- * \param len       The length of the buffer.
+ * \param len       The length of the input buffer \c *buf in Bytes.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if input is invalid.
  * \return          #MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE if the group is not
- *                  recognised.
+ *                  recognized.
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_tls_read_group_id( mbedtls_ecp_group_id *grp,
-                                   const unsigned char **buf, size_t len );
+                                   const unsigned char **buf,
+                                   size_t len );
 /**
- * \brief           This function writes the TLS ECParameters record for a group.
+ * \brief           This function exports an elliptic curve as a TLS
+ *                  ECParameters record as defined in RFC 4492, Section 5.4.
  *
- * \param grp       The ECP group used.
- * \param olen      The number of Bytes written.
- * \param buf       The buffer to write to.
- * \param blen      The length of the buffer.
+ * \param grp       The ECP group to be exported.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param olen      The address at which to store the number of Bytes written.
+ *                  This must not be \c NULL.
+ * \param buf       The buffer to write to. This must be a writable buffer
+ *                  of length \p blen Bytes.
+ * \param blen      The length of the output buffer \p buf in Bytes.
  *
  * \return          \c 0 on success.
- * \return          #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL on failure.
+ * \return          #MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL if the output
+ *                  buffer is too small to hold the exported group.
+ * \return          Another negative error code on other kinds of failure.
  */
-int mbedtls_ecp_tls_write_group( const mbedtls_ecp_group *grp, size_t *olen,
-                         unsigned char *buf, size_t blen );
+int mbedtls_ecp_tls_write_group( const mbedtls_ecp_group *grp,
+                                 size_t *olen,
+                                 unsigned char *buf, size_t blen );
 
 /**
- * \brief           This function performs multiplication of a point by
- *                  an integer: \p R = \p m * \p P.
+ * \brief           This function performs a scalar multiplication of a point
+ *                  by an integer: \p R = \p m * \p P.
  *
  *                  It is not thread-safe to use same group in multiple threads.
  *
@@ -755,17 +808,22 @@
  *                  targeting these results. We recommend always providing
  *                  a non-NULL \p f_rng. The overhead is negligible.
  *
- * \param grp       The ECP group.
- * \param R         The destination point.
- * \param m         The integer by which to multiply.
- * \param P         The point to multiply.
- * \param f_rng     The RNG function.
- * \param p_rng     The RNG context.
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param R         The point in which to store the result of the calculation.
+ *                  This must be initialized.
+ * \param m         The integer by which to multiply. This must be initialized.
+ * \param P         The point to multiply. This must be initialized.
+ * \param f_rng     The RNG function. This may be \c NULL if randomization
+ *                  of intermediate results isn't desired (discouraged).
+ * \param p_rng     The RNG context to be passed to \p p_rng.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_ECP_INVALID_KEY if \p m is not a valid private
  *                  key, or \p P is not a valid public key.
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_mul( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
              const mbedtls_mpi *m, const mbedtls_ecp_point *P,
@@ -781,12 +839,16 @@
  *                  it can return early and restart according to the limit set
  *                  with \c mbedtls_ecp_set_max_ops() to reduce blocking.
  *
- * \param grp       The ECP group.
- * \param R         The destination point.
- * \param m         The integer by which to multiply.
- * \param P         The point to multiply.
- * \param f_rng     The RNG function.
- * \param p_rng     The RNG context.
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param R         The point in which to store the result of the calculation.
+ *                  This must be initialized.
+ * \param m         The integer by which to multiply. This must be initialized.
+ * \param P         The point to multiply. This must be initialized.
+ * \param f_rng     The RNG function. This may be \c NULL if randomization
+ *                  of intermediate results isn't desired (discouraged).
+ * \param p_rng     The RNG context to be passed to \p p_rng.
  * \param rs_ctx    The restart context (NULL disables restart).
  *
  * \return          \c 0 on success.
@@ -795,6 +857,7 @@
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
  * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
  *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_mul_restartable( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
              const mbedtls_mpi *m, const mbedtls_ecp_point *P,
@@ -810,18 +873,25 @@
  * \note            In contrast to mbedtls_ecp_mul(), this function does not
  *                  guarantee a constant execution flow and timing.
  *
- * \param grp       The ECP group.
- * \param R         The destination point.
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param R         The point in which to store the result of the calculation.
+ *                  This must be initialized.
  * \param m         The integer by which to multiply \p P.
- * \param P         The point to multiply by \p m.
+ *                  This must be initialized.
+ * \param P         The point to multiply by \p m. This must be initialized.
  * \param n         The integer by which to multiply \p Q.
+ *                  This must be initialized.
  * \param Q         The point to be multiplied by \p n.
+ *                  This must be initialized.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_ECP_INVALID_KEY if \p m or \p n are not
  *                  valid private keys, or \p P or \p Q are not valid public
  *                  keys.
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_muladd( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
              const mbedtls_mpi *m, const mbedtls_ecp_point *P,
@@ -838,12 +908,18 @@
  *                  but it can return early and restart according to the limit
  *                  set with \c mbedtls_ecp_set_max_ops() to reduce blocking.
  *
- * \param grp       The ECP group.
- * \param R         The destination point.
+ * \param grp       The ECP group to use.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param R         The point in which to store the result of the calculation.
+ *                  This must be initialized.
  * \param m         The integer by which to multiply \p P.
- * \param P         The point to multiply by \p m.
+ *                  This must be initialized.
+ * \param P         The point to multiply by \p m. This must be initialized.
  * \param n         The integer by which to multiply \p Q.
+ *                  This must be initialized.
  * \param Q         The point to be multiplied by \p n.
+ *                  This must be initialized.
  * \param rs_ctx    The restart context (NULL disables restart).
  *
  * \return          \c 0 on success.
@@ -853,6 +929,7 @@
  * \return          #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory-allocation failure.
  * \return          #MBEDTLS_ERR_ECP_IN_PROGRESS if maximum number of
  *                  operations was reached: see \c mbedtls_ecp_set_max_ops().
+ * \return          Another negative error code on other kinds of failure.
  */
 int mbedtls_ecp_muladd_restartable(
              mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
@@ -877,38 +954,51 @@
  *                  structures, such as ::mbedtls_ecdh_context or
  *                  ::mbedtls_ecdsa_context.
  *
- * \param grp       The curve the point should lie on.
- * \param pt        The point to check.
+ * \param grp       The ECP group the point should belong to.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param pt        The point to check. This must be initialized.
  *
  * \return          \c 0 if the point is a valid public key.
- * \return          #MBEDTLS_ERR_ECP_INVALID_KEY on failure.
+ * \return          #MBEDTLS_ERR_ECP_INVALID_KEY if the point is not
+ *                  a valid public key for the given curve.
+ * \return          Another negative error code on other kinds of failure.
  */
-int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *pt );
+int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp,
+                              const mbedtls_ecp_point *pt );
 
 /**
- * \brief           This function checks that an \p mbedtls_mpi is a valid private
- *                  key for this curve.
+ * \brief           This function checks that an \p mbedtls_mpi is a
+ *                  valid private key for this curve.
  *
  * \note            This function uses bare components rather than an
  *                  ::mbedtls_ecp_keypair structure to ease use with other
  *                  structures, such as ::mbedtls_ecdh_context or
  *                  ::mbedtls_ecdsa_context.
  *
- * \param grp       The group used.
- * \param d         The integer to check.
+ * \param grp       The ECP group the private key should belong to.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param d         The integer to check. This must be initialized.
  *
  * \return          \c 0 if the point is a valid private key.
- * \return          #MBEDTLS_ERR_ECP_INVALID_KEY on failure.
+ * \return          #MBEDTLS_ERR_ECP_INVALID_KEY if the point is not a valid
+ *                  private key for the given curve.
+ * \return          Another negative error code on other kinds of failure.
  */
-int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp, const mbedtls_mpi *d );
+int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp,
+                               const mbedtls_mpi *d );
 
 /**
  * \brief           This function generates a private key.
  *
- * \param grp       The ECP group.
- * \param d         The destination MPI (secret part).
- * \param f_rng     The RNG function.
- * \param p_rng     The RNG parameter.
+ * \param grp       The ECP group to generate a private key for.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param d         The destination MPI (secret part). This must be initialized.
+ * \param f_rng     The RNG function. This must not be \c NULL.
+ * \param p_rng     The RNG parameter to be passed to \p f_rng. This may be
+ *                  \c NULL if \p f_rng doesn't need a context argument.
  *
  * \return          \c 0 on success.
  * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX error code
@@ -928,22 +1018,29 @@
  *                  structures, such as ::mbedtls_ecdh_context or
  *                  ::mbedtls_ecdsa_context.
  *
- * \param grp       The ECP group.
- * \param G         The chosen base point.
+ * \param grp       The ECP group to generate a key pair for.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
+ * \param G         The base point to use. This must be initialized
+ *                  and belong to \p grp. It replaces the default base
+ *                  point \c grp->G used by mbedtls_ecp_gen_keypair().
  * \param d         The destination MPI (secret part).
+ *                  This must be initialized.
  * \param Q         The destination point (public part).
- * \param f_rng     The RNG function.
- * \param p_rng     The RNG context.
+ *                  This must be initialized.
+ * \param f_rng     The RNG function. This must not be \c NULL.
+ * \param p_rng     The RNG context to be passed to \p f_rng. This may
+ *                  be \c NULL if \p f_rng doesn't need a context argument.
  *
  * \return          \c 0 on success.
  * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX error code
  *                  on failure.
  */
 int mbedtls_ecp_gen_keypair_base( mbedtls_ecp_group *grp,
-                     const mbedtls_ecp_point *G,
-                     mbedtls_mpi *d, mbedtls_ecp_point *Q,
-                     int (*f_rng)(void *, unsigned char *, size_t),
-                     void *p_rng );
+                                  const mbedtls_ecp_point *G,
+                                  mbedtls_mpi *d, mbedtls_ecp_point *Q,
+                                  int (*f_rng)(void *, unsigned char *, size_t),
+                                  void *p_rng );
 
 /**
  * \brief           This function generates an ECP keypair.
@@ -953,34 +1050,42 @@
  *                  structures, such as ::mbedtls_ecdh_context or
  *                  ::mbedtls_ecdsa_context.
  *
- * \param grp       The ECP group.
+ * \param grp       The ECP group to generate a key pair for.
+ *                  This must be initialized and have group parameters
+ *                  set, for example through mbedtls_ecp_group_load().
  * \param d         The destination MPI (secret part).
+ *                  This must be initialized.
  * \param Q         The destination point (public part).
- * \param f_rng     The RNG function.
- * \param p_rng     The RNG context.
+ *                  This must be initialized.
+ * \param f_rng     The RNG function. This must not be \c NULL.
+ * \param p_rng     The RNG context to be passed to \p f_rng. This may
+ *                  be \c NULL if \p f_rng doesn't need a context argument.
  *
  * \return          \c 0 on success.
  * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX error code
  *                  on failure.
  */
-int mbedtls_ecp_gen_keypair( mbedtls_ecp_group *grp, mbedtls_mpi *d, mbedtls_ecp_point *Q,
-                     int (*f_rng)(void *, unsigned char *, size_t),
-                     void *p_rng );
+int mbedtls_ecp_gen_keypair( mbedtls_ecp_group *grp, mbedtls_mpi *d,
+                             mbedtls_ecp_point *Q,
+                             int (*f_rng)(void *, unsigned char *, size_t),
+                             void *p_rng );
 
 /**
  * \brief           This function generates an ECP key.
  *
  * \param grp_id    The ECP group identifier.
- * \param key       The destination key.
- * \param f_rng     The RNG function.
- * \param p_rng     The RNG context.
+ * \param key       The destination key. This must be initialized.
+ * \param f_rng     The RNG function to use. This must not be \c NULL.
+ * \param p_rng     The RNG context to be passed to \p f_rng. This may
+ *                  be \c NULL if \p f_rng doesn't need a context argument.
  *
  * \return          \c 0 on success.
  * \return          An \c MBEDTLS_ERR_ECP_XXX or \c MBEDTLS_MPI_XXX error code
  *                  on failure.
  */
 int mbedtls_ecp_gen_key( mbedtls_ecp_group_id grp_id, mbedtls_ecp_keypair *key,
-                int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
+                         int (*f_rng)(void *, unsigned char *, size_t),
+                         void *p_rng );
 
 /**
  * \brief           This function checks that the keypair objects
@@ -988,16 +1093,19 @@
  *                  same public point, and that the private key in
  *                  \p prv is consistent with the public key.
  *
- * \param pub       The keypair structure holding the public key.
- *                  If it contains a private key, that part is ignored.
+ * \param pub       The keypair structure holding the public key. This
+ *                  must be initialized. If it contains a private key, that
+ *                  part is ignored.
  * \param prv       The keypair structure holding the full keypair.
+ *                  This must be initialized.
  *
  * \return          \c 0 on success, meaning that the keys are valid and match.
  * \return          #MBEDTLS_ERR_ECP_BAD_INPUT_DATA if the keys are invalid or do not match.
  * \return          An \c MBEDTLS_ERR_ECP_XXX or an \c MBEDTLS_ERR_MPI_XXX
  *                  error code on calculation failure.
  */
-int mbedtls_ecp_check_pub_priv( const mbedtls_ecp_keypair *pub, const mbedtls_ecp_keypair *prv );
+int mbedtls_ecp_check_pub_priv( const mbedtls_ecp_keypair *pub,
+                                const mbedtls_ecp_keypair *prv );
 
 #if defined(MBEDTLS_SELF_TEST)
 
diff --git a/include/mbedtls/gcm.h b/include/mbedtls/gcm.h
index 93d15ee..fccabb0 100644
--- a/include/mbedtls/gcm.h
+++ b/include/mbedtls/gcm.h
@@ -85,7 +85,7 @@
  *                  cipher, nor set the key. For this purpose, use
  *                  mbedtls_gcm_setkey().
  *
- * \param ctx       The GCM context to initialize.
+ * \param ctx       The GCM context to initialize. This must not be \c NULL.
  */
 void mbedtls_gcm_init( mbedtls_gcm_context *ctx );
 
@@ -93,9 +93,10 @@
  * \brief           This function associates a GCM context with a
  *                  cipher algorithm and a key.
  *
- * \param ctx       The GCM context to initialize.
+ * \param ctx       The GCM context. This must be initialized.
  * \param cipher    The 128-bit block cipher to use.
- * \param key       The encryption key.
+ * \param key       The encryption key. This must be a readable buffer of at
+ *                  least \p keybits bits.
  * \param keybits   The key size in bits. Valid options are:
  *                  <ul><li>128 bits</li>
  *                  <li>192 bits</li>
@@ -122,7 +123,8 @@
  *                  authentic. You should use this function to perform encryption
  *                  only. For decryption, use mbedtls_gcm_auth_decrypt() instead.
  *
- * \param ctx       The GCM context to use for encryption or decryption.
+ * \param ctx       The GCM context to use for encryption or decryption. This
+ *                  must be initialized.
  * \param mode      The operation to perform:
  *                  - #MBEDTLS_GCM_ENCRYPT to perform authenticated encryption.
  *                    The ciphertext is written to \p output and the
@@ -136,21 +138,27 @@
  *                    calling this function in decryption mode.
  * \param length    The length of the input data, which is equal to the length
  *                  of the output data.
- * \param iv        The initialization vector.
+ * \param iv        The initialization vector. This must be a readable buffer of
+ *                  at least \p iv_len Bytes.
  * \param iv_len    The length of the IV.
- * \param add       The buffer holding the additional data.
+ * \param add       The buffer holding the additional data. This must be of at
+ *                  least that size in Bytes.
  * \param add_len   The length of the additional data.
- * \param input     The buffer holding the input data. Its size is \b length.
- * \param output    The buffer for holding the output data. It must have room
- *                  for \b length bytes.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, this must be a readable buffer of at least that
+ *                  size in Bytes.
+ * \param output    The buffer for holding the output data. If \p length is greater
+ *                  than zero, this must be a writable buffer of at least that
+ *                  size in Bytes.
  * \param tag_len   The length of the tag to generate.
- * \param tag       The buffer for holding the tag.
+ * \param tag       The buffer for holding the tag. This must be a readable
+ *                  buffer of at least \p tag_len Bytes.
  *
  * \return          \c 0 if the encryption or decryption was performed
  *                  successfully. Note that in #MBEDTLS_GCM_DECRYPT mode,
  *                  this does not indicate that the data is authentic.
- * \return          #MBEDTLS_ERR_GCM_BAD_INPUT if the lengths are not valid or
- *                  a cipher-specific error code if the encryption
+ * \return          #MBEDTLS_ERR_GCM_BAD_INPUT if the lengths or pointers are
+ *                  not valid or a cipher-specific error code if the encryption
  *                  or decryption failed.
  */
 int mbedtls_gcm_crypt_and_tag( mbedtls_gcm_context *ctx,
@@ -173,23 +181,30 @@
  *                  input buffer. If the buffers overlap, the output buffer
  *                  must trail at least 8 Bytes behind the input buffer.
  *
- * \param ctx       The GCM context.
+ * \param ctx       The GCM context. This must be initialized.
  * \param length    The length of the ciphertext to decrypt, which is also
  *                  the length of the decrypted plaintext.
- * \param iv        The initialization vector.
+ * \param iv        The initialization vector. This must be a readable buffer
+ *                  of at least \p iv_len Bytes.
  * \param iv_len    The length of the IV.
- * \param add       The buffer holding the additional data.
+ * \param add       The buffer holding the additional data. This must be of at
+ *                  least that size in Bytes.
  * \param add_len   The length of the additional data.
- * \param tag       The buffer holding the tag to verify.
+ * \param tag       The buffer holding the tag to verify. This must be a
+ *                  readable buffer of at least \p tag_len Bytes.
  * \param tag_len   The length of the tag to verify.
- * \param input     The buffer holding the ciphertext. Its size is \b length.
- * \param output    The buffer for holding the decrypted plaintext. It must
- *                  have room for \b length bytes.
+ * \param input     The buffer holding the ciphertext. If \p length is greater
+ *                  than zero, this must be a readable buffer of at least that
+ *                  size.
+ * \param output    The buffer for holding the decrypted plaintext. If \p length
+ *                  is greater than zero, this must be a writable buffer of at
+ *                  least that size.
  *
  * \return          \c 0 if successful and authenticated.
  * \return          #MBEDTLS_ERR_GCM_AUTH_FAILED if the tag does not match.
- * \return          #MBEDTLS_ERR_GCM_BAD_INPUT if the lengths are not valid or
- *                  a cipher-specific error code if the decryption failed.
+ * \return          #MBEDTLS_ERR_GCM_BAD_INPUT if the lengths or pointers are
+ *                  not valid or a cipher-specific error code if the decryption
+ *                  failed.
  */
 int mbedtls_gcm_auth_decrypt( mbedtls_gcm_context *ctx,
                       size_t length,
@@ -206,15 +221,16 @@
  * \brief           This function starts a GCM encryption or decryption
  *                  operation.
  *
- * \param ctx       The GCM context.
+ * \param ctx       The GCM context. This must be initialized.
  * \param mode      The operation to perform: #MBEDTLS_GCM_ENCRYPT or
  *                  #MBEDTLS_GCM_DECRYPT.
- * \param iv        The initialization vector.
+ * \param iv        The initialization vector. This must be a readable buffer of
+ *                  at least \p iv_len Bytes.
  * \param iv_len    The length of the IV.
- * \param add       The buffer holding the additional data, or NULL
- *                  if \p add_len is 0.
- * \param add_len   The length of the additional data. If 0,
- *                  \p add is NULL.
+ * \param add       The buffer holding the additional data, or \c NULL
+ *                  if \p add_len is \c 0.
+ * \param add_len   The length of the additional data. If \c 0,
+ *                  \p add may be \c NULL.
  *
  * \return          \c 0 on success.
  */
@@ -237,11 +253,15 @@
  *                  input buffer. If the buffers overlap, the output buffer
  *                  must trail at least 8 Bytes behind the input buffer.
  *
- * \param ctx       The GCM context.
+ * \param ctx       The GCM context. This must be initialized.
  * \param length    The length of the input data. This must be a multiple of
  *                  16 except in the last call before mbedtls_gcm_finish().
- * \param input     The buffer holding the input data.
- * \param output    The buffer for holding the output data.
+ * \param input     The buffer holding the input data. If \p length is greater
+ *                  than zero, this must be a readable buffer of at least that
+ *                  size in Bytes.
+ * \param output    The buffer for holding the output data. If \p length is
+ *                  greater than zero, this must be a writable buffer of at
+ *                  least that size in Bytes.
  *
  * \return         \c 0 on success.
  * \return         #MBEDTLS_ERR_GCM_BAD_INPUT on failure.
@@ -258,9 +278,11 @@
  *                  It wraps up the GCM stream, and generates the
  *                  tag. The tag can have a maximum length of 16 Bytes.
  *
- * \param ctx       The GCM context.
- * \param tag       The buffer for holding the tag.
- * \param tag_len   The length of the tag to generate. Must be at least four.
+ * \param ctx       The GCM context. This must be initialized.
+ * \param tag       The buffer for holding the tag. This must be a readable
+ *                  buffer of at least \p tag_len Bytes.
+ * \param tag_len   The length of the tag to generate. This must be at least
+ *                  four.
  *
  * \return          \c 0 on success.
  * \return          #MBEDTLS_ERR_GCM_BAD_INPUT on failure.
@@ -273,7 +295,8 @@
  * \brief           This function clears a GCM context and the underlying
  *                  cipher sub-context.
  *
- * \param ctx       The GCM context to clear.
+ * \param ctx       The GCM context to clear. If this is \c NULL, the call has
+ *                  no effect. Otherwise, this must be initialized.
  */
 void mbedtls_gcm_free( mbedtls_gcm_context *ctx );
 
diff --git a/include/mbedtls/padlock.h b/include/mbedtls/padlock.h
index 677936e..7a5d083 100644
--- a/include/mbedtls/padlock.h
+++ b/include/mbedtls/padlock.h
@@ -3,6 +3,9 @@
  *
  * \brief VIA PadLock ACE for HW encryption/decryption supported by some
  *        processors
+ *
+ * \warning These functions are only for internal use by other library
+ *          functions; you must not call them directly.
  */
 /*
  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
@@ -57,7 +60,10 @@
 #endif
 
 /**
- * \brief          PadLock detection routine
+ * \brief          Internal PadLock detection routine
+ *
+ * \note           This function is only for internal use by other library
+ *                 functions; you must not call it directly.
  *
  * \param feature  The feature to detect
  *
@@ -66,7 +72,10 @@
 int mbedtls_padlock_has_support( int feature );
 
 /**
- * \brief          PadLock AES-ECB block en(de)cryption
+ * \brief          Internal PadLock AES-ECB block en(de)cryption
+ *
+ * \note           This function is only for internal use by other library
+ *                 functions; you must not call it directly.
  *
  * \param ctx      AES context
  * \param mode     MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
@@ -76,12 +85,15 @@
  * \return         0 if success, 1 if operation failed
  */
 int mbedtls_padlock_xcryptecb( mbedtls_aes_context *ctx,
-                       int mode,
-                       const unsigned char input[16],
-                       unsigned char output[16] );
+                               int mode,
+                               const unsigned char input[16],
+                               unsigned char output[16] );
 
 /**
- * \brief          PadLock AES-CBC buffer en(de)cryption
+ * \brief          Internal PadLock AES-CBC buffer en(de)cryption
+ *
+ * \note           This function is only for internal use by other library
+ *                 functions; you must not call it directly.
  *
  * \param ctx      AES context
  * \param mode     MBEDTLS_AES_ENCRYPT or MBEDTLS_AES_DECRYPT
@@ -93,11 +105,11 @@
  * \return         0 if success, 1 if operation failed
  */
 int mbedtls_padlock_xcryptcbc( mbedtls_aes_context *ctx,
-                       int mode,
-                       size_t length,
-                       unsigned char iv[16],
-                       const unsigned char *input,
-                       unsigned char *output );
+                               int mode,
+                               size_t length,
+                               unsigned char iv[16],
+                               const unsigned char *input,
+                               unsigned char *output );
 
 #ifdef __cplusplus
 }
diff --git a/include/mbedtls/platform_util.h b/include/mbedtls/platform_util.h
index 8846f45..b0e72ad 100644
--- a/include/mbedtls/platform_util.h
+++ b/include/mbedtls/platform_util.h
@@ -102,6 +102,27 @@
 
 #endif /* MBEDTLS_CHECK_PARAMS */
 
+/* Internal helper macros for deprecating API constants. */
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+#if defined(MBEDTLS_DEPRECATED_WARNING)
+/* Deliberately don't (yet) export MBEDTLS_DEPRECATED here
+ * to avoid conflict with other headers which define and use
+ * it, too. We might want to move all these definitions here at
+ * some point for uniformity. */
+#define MBEDTLS_DEPRECATED __attribute__((deprecated))
+MBEDTLS_DEPRECATED typedef char const * mbedtls_deprecated_string_constant_t;
+#define MBEDTLS_DEPRECATED_STRING_CONSTANT( VAL )       \
+    ( (mbedtls_deprecated_string_constant_t) ( VAL ) )
+MBEDTLS_DEPRECATED typedef int mbedtls_deprecated_numeric_constant_t;
+#define MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( VAL )       \
+    ( (mbedtls_deprecated_numeric_constant_t) ( VAL ) )
+#undef MBEDTLS_DEPRECATED
+#else /* MBEDTLS_DEPRECATED_WARNING */
+#define MBEDTLS_DEPRECATED_STRING_CONSTANT( VAL ) VAL
+#define MBEDTLS_DEPRECATED_NUMERIC_CONSTANT( VAL ) VAL
+#endif /* MBEDTLS_DEPRECATED_WARNING */
+#endif /* MBEDTLS_DEPRECATED_REMOVED */
+
 /**
  * \brief       Securely zeroize a buffer
  *
diff --git a/library/aes.c b/library/aes.c
index cc1e5ce..0543cd7 100644
--- a/library/aes.c
+++ b/library/aes.c
@@ -575,7 +575,6 @@
     {
         aes_gen_tables();
         aes_init_done = 1;
-
     }
 #endif
 
@@ -771,6 +770,9 @@
     const unsigned char *key1, *key2;
     unsigned int key1bits, key2bits;
 
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( key != NULL );
+
     ret = mbedtls_aes_xts_decode_keys( key, keybits, &key1, &key1bits,
                                        &key2, &key2bits );
     if( ret != 0 )
@@ -793,6 +795,9 @@
     const unsigned char *key1, *key2;
     unsigned int key1bits, key2bits;
 
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( key != NULL );
+
     ret = mbedtls_aes_xts_decode_keys( key, keybits, &key1, &key1bits,
                                        &key2, &key2bits );
     if( ret != 0 )
@@ -996,10 +1001,16 @@
  * AES-ECB block encryption/decryption
  */
 int mbedtls_aes_crypt_ecb( mbedtls_aes_context *ctx,
-                    int mode,
-                    const unsigned char input[16],
-                    unsigned char output[16] )
+                           int mode,
+                           const unsigned char input[16],
+                           unsigned char output[16] )
 {
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
+    AES_VALIDATE_RET( mode == MBEDTLS_AES_ENCRYPT ||
+                      mode == MBEDTLS_AES_DECRYPT );
+
 #if defined(MBEDTLS_AESNI_C) && defined(MBEDTLS_HAVE_X86_64)
     if( mbedtls_aesni_has_support( MBEDTLS_AESNI_AES ) )
         return( mbedtls_aesni_crypt_ecb( ctx, mode, input, output ) );
@@ -1037,6 +1048,13 @@
     int i;
     unsigned char temp[16];
 
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( mode == MBEDTLS_AES_ENCRYPT ||
+                      mode == MBEDTLS_AES_DECRYPT );
+    AES_VALIDATE_RET( iv != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
+
     if( length % 16 )
         return( MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH );
 
@@ -1162,6 +1180,13 @@
     unsigned char prev_tweak[16];
     unsigned char tmp[16];
 
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( mode == MBEDTLS_AES_ENCRYPT ||
+                      mode == MBEDTLS_AES_DECRYPT );
+    AES_VALIDATE_RET( data_unit != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
+
     /* Data units must be at least 16 bytes long. */
     if( length < 16 )
         return MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH;
@@ -1261,7 +1286,20 @@
                        unsigned char *output )
 {
     int c;
-    size_t n = *iv_off;
+    size_t n;
+
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( mode == MBEDTLS_AES_ENCRYPT ||
+                      mode == MBEDTLS_AES_DECRYPT );
+    AES_VALIDATE_RET( iv_off != NULL );
+    AES_VALIDATE_RET( iv != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
+
+    n = *iv_off;
+
+    if( n > 15 )
+        return( MBEDTLS_ERR_AES_BAD_INPUT_DATA );
 
     if( mode == MBEDTLS_AES_DECRYPT )
     {
@@ -1299,15 +1337,21 @@
  * AES-CFB8 buffer encryption/decryption
  */
 int mbedtls_aes_crypt_cfb8( mbedtls_aes_context *ctx,
-                       int mode,
-                       size_t length,
-                       unsigned char iv[16],
-                       const unsigned char *input,
-                       unsigned char *output )
+                            int mode,
+                            size_t length,
+                            unsigned char iv[16],
+                            const unsigned char *input,
+                            unsigned char *output )
 {
     unsigned char c;
     unsigned char ov[17];
 
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( mode == MBEDTLS_AES_ENCRYPT ||
+                      mode == MBEDTLS_AES_DECRYPT );
+    AES_VALIDATE_RET( iv != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
     while( length-- )
     {
         memcpy( ov, iv, 16 );
@@ -1340,7 +1384,18 @@
                            unsigned char *output )
 {
     int ret = 0;
-    size_t n = *iv_off;
+    size_t n;
+
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( iv_off != NULL );
+    AES_VALIDATE_RET( iv != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
+
+    n = *iv_off;
+
+    if( n > 15 )
+        return( MBEDTLS_ERR_AES_BAD_INPUT_DATA );
 
     while( length-- )
     {
@@ -1375,7 +1430,16 @@
                        unsigned char *output )
 {
     int c, i;
-    size_t n = *nc_off;
+    size_t n;
+
+    AES_VALIDATE_RET( ctx != NULL );
+    AES_VALIDATE_RET( nc_off != NULL );
+    AES_VALIDATE_RET( nonce_counter != NULL );
+    AES_VALIDATE_RET( stream_block != NULL );
+    AES_VALIDATE_RET( input != NULL );
+    AES_VALIDATE_RET( output != NULL );
+
+    n = *nc_off;
 
     if ( n > 0x0F )
         return( MBEDTLS_ERR_AES_BAD_INPUT_DATA );
diff --git a/library/aria.c b/library/aria.c
index ca9e147..aff66d6 100644
--- a/library/aria.c
+++ b/library/aria.c
@@ -55,6 +55,12 @@
 #define inline __inline
 #endif
 
+/* Parameter validation macros */
+#define ARIA_VALIDATE_RET( cond )                                       \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ARIA_BAD_INPUT_DATA )
+#define ARIA_VALIDATE( cond )                                           \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 /*
  * 32-bit integer manipulation macros (little endian)
  */
@@ -449,9 +455,11 @@
 
     int i;
     uint32_t w[4][4], *w2;
+    ARIA_VALIDATE_RET( ctx != NULL );
+    ARIA_VALIDATE_RET( key != NULL );
 
     if( keybits != 128 && keybits != 192 && keybits != 256 )
-        return( MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH );
+        return( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA );
 
     /* Copy key to W0 (and potential remainder to W1) */
     GET_UINT32_LE( w[0][0], key,  0 );
@@ -503,6 +511,8 @@
                              const unsigned char *key, unsigned int keybits )
 {
     int i, j, k, ret;
+    ARIA_VALIDATE_RET( ctx != NULL );
+    ARIA_VALIDATE_RET( key != NULL );
 
     ret = mbedtls_aria_setkey_enc( ctx, key, keybits );
     if( ret != 0 )
@@ -539,6 +549,9 @@
     int i;
 
     uint32_t a, b, c, d;
+    ARIA_VALIDATE_RET( ctx != NULL );
+    ARIA_VALIDATE_RET( input != NULL );
+    ARIA_VALIDATE_RET( output != NULL );
 
     GET_UINT32_LE( a, input,  0 );
     GET_UINT32_LE( b, input,  4 );
@@ -586,6 +599,7 @@
 /* Initialize context */
 void mbedtls_aria_init( mbedtls_aria_context *ctx )
 {
+    ARIA_VALIDATE( ctx != NULL );
     memset( ctx, 0, sizeof( mbedtls_aria_context ) );
 }
 
@@ -612,6 +626,13 @@
     int i;
     unsigned char temp[MBEDTLS_ARIA_BLOCKSIZE];
 
+    ARIA_VALIDATE_RET( ctx != NULL );
+    ARIA_VALIDATE_RET( mode == MBEDTLS_ARIA_ENCRYPT ||
+                       mode == MBEDTLS_ARIA_DECRYPT );
+    ARIA_VALIDATE_RET( length == 0 || input  != NULL );
+    ARIA_VALIDATE_RET( length == 0 || output != NULL );
+    ARIA_VALIDATE_RET( iv != NULL );
+
     if( length % MBEDTLS_ARIA_BLOCKSIZE )
         return( MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH );
 
@@ -665,7 +686,23 @@
                                unsigned char *output )
 {
     unsigned char c;
-    size_t n = *iv_off;
+    size_t n;
+
+    ARIA_VALIDATE_RET( ctx != NULL );
+    ARIA_VALIDATE_RET( mode == MBEDTLS_ARIA_ENCRYPT ||
+                       mode == MBEDTLS_ARIA_DECRYPT );
+    ARIA_VALIDATE_RET( length == 0 || input  != NULL );
+    ARIA_VALIDATE_RET( length == 0 || output != NULL );
+    ARIA_VALIDATE_RET( iv != NULL );
+    ARIA_VALIDATE_RET( iv_off != NULL );
+
+    n = *iv_off;
+
+    /* An overly large value of n can lead to an unlimited
+     * buffer overflow. Therefore, guard against this
+     * outside of parameter validation. */
+    if( n >= MBEDTLS_ARIA_BLOCKSIZE )
+        return( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA );
 
     if( mode == MBEDTLS_ARIA_DECRYPT )
     {
@@ -713,7 +750,21 @@
                             unsigned char *output )
 {
     int c, i;
-    size_t n = *nc_off;
+    size_t n;
+
+    ARIA_VALIDATE_RET( ctx != NULL );
+    ARIA_VALIDATE_RET( length == 0 || input  != NULL );
+    ARIA_VALIDATE_RET( length == 0 || output != NULL );
+    ARIA_VALIDATE_RET( nonce_counter != NULL );
+    ARIA_VALIDATE_RET( stream_block  != NULL );
+    ARIA_VALIDATE_RET( nc_off != NULL );
+
+    n = *nc_off;
+    /* An overly large value of n can lead to an unlimited
+     * buffer overflow. Therefore, guard against this
+     * outside of parameter validation. */
+    if( n >= MBEDTLS_ARIA_BLOCKSIZE )
+        return( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA );
 
     while( length-- )
     {
diff --git a/library/blowfish.c b/library/blowfish.c
index 5b6bb98..cbf9238 100644
--- a/library/blowfish.c
+++ b/library/blowfish.c
@@ -40,6 +40,12 @@
 
 #if !defined(MBEDTLS_BLOWFISH_ALT)
 
+/* Parameter validation macros */
+#define BLOWFISH_VALIDATE_RET( cond )                                       \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA )
+#define BLOWFISH_VALIDATE( cond )                                           \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 /*
  * 32-bit integer manipulation macros (big endian)
  */
@@ -153,6 +159,7 @@
 
 void mbedtls_blowfish_init( mbedtls_blowfish_context *ctx )
 {
+    BLOWFISH_VALIDATE( ctx != NULL );
     memset( ctx, 0, sizeof( mbedtls_blowfish_context ) );
 }
 
@@ -167,16 +174,20 @@
 /*
  * Blowfish key schedule
  */
-int mbedtls_blowfish_setkey( mbedtls_blowfish_context *ctx, const unsigned char *key,
-                     unsigned int keybits )
+int mbedtls_blowfish_setkey( mbedtls_blowfish_context *ctx,
+                             const unsigned char *key,
+                             unsigned int keybits )
 {
     unsigned int i, j, k;
     uint32_t data, datal, datar;
+    BLOWFISH_VALIDATE_RET( ctx != NULL );
+    BLOWFISH_VALIDATE_RET( key != NULL );
 
-    if( keybits < MBEDTLS_BLOWFISH_MIN_KEY_BITS || keybits > MBEDTLS_BLOWFISH_MAX_KEY_BITS ||
-        ( keybits % 8 ) )
+    if( keybits < MBEDTLS_BLOWFISH_MIN_KEY_BITS    ||
+        keybits > MBEDTLS_BLOWFISH_MAX_KEY_BITS    ||
+        keybits % 8 != 0 )
     {
-        return( MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH );
+        return( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA );
     }
 
     keybits >>= 3;
@@ -231,6 +242,11 @@
                     unsigned char output[MBEDTLS_BLOWFISH_BLOCKSIZE] )
 {
     uint32_t X0, X1;
+    BLOWFISH_VALIDATE_RET( ctx != NULL );
+    BLOWFISH_VALIDATE_RET( mode == MBEDTLS_BLOWFISH_ENCRYPT ||
+                           mode == MBEDTLS_BLOWFISH_DECRYPT );
+    BLOWFISH_VALIDATE_RET( input  != NULL );
+    BLOWFISH_VALIDATE_RET( output != NULL );
 
     GET_UINT32_BE( X0, input,  0 );
     GET_UINT32_BE( X1, input,  4 );
@@ -263,6 +279,12 @@
 {
     int i;
     unsigned char temp[MBEDTLS_BLOWFISH_BLOCKSIZE];
+    BLOWFISH_VALIDATE_RET( ctx != NULL );
+    BLOWFISH_VALIDATE_RET( mode == MBEDTLS_BLOWFISH_ENCRYPT ||
+                           mode == MBEDTLS_BLOWFISH_DECRYPT );
+    BLOWFISH_VALIDATE_RET( iv != NULL );
+    BLOWFISH_VALIDATE_RET( length == 0 || input  != NULL );
+    BLOWFISH_VALIDATE_RET( length == 0 || output != NULL );
 
     if( length % MBEDTLS_BLOWFISH_BLOCKSIZE )
         return( MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH );
@@ -317,7 +339,19 @@
                        unsigned char *output )
 {
     int c;
-    size_t n = *iv_off;
+    size_t n;
+
+    BLOWFISH_VALIDATE_RET( ctx != NULL );
+    BLOWFISH_VALIDATE_RET( mode == MBEDTLS_BLOWFISH_ENCRYPT ||
+                           mode == MBEDTLS_BLOWFISH_DECRYPT );
+    BLOWFISH_VALIDATE_RET( iv     != NULL );
+    BLOWFISH_VALIDATE_RET( iv_off != NULL );
+    BLOWFISH_VALIDATE_RET( length == 0 || input  != NULL );
+    BLOWFISH_VALIDATE_RET( length == 0 || output != NULL );
+
+    n = *iv_off;
+    if( n >= 8 )
+        return( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA );
 
     if( mode == MBEDTLS_BLOWFISH_DECRYPT )
     {
@@ -365,7 +399,17 @@
                        unsigned char *output )
 {
     int c, i;
-    size_t n = *nc_off;
+    size_t n;
+    BLOWFISH_VALIDATE_RET( ctx != NULL );
+    BLOWFISH_VALIDATE_RET( nonce_counter != NULL );
+    BLOWFISH_VALIDATE_RET( stream_block  != NULL );
+    BLOWFISH_VALIDATE_RET( nc_off != NULL );
+    BLOWFISH_VALIDATE_RET( length == 0 || input  != NULL );
+    BLOWFISH_VALIDATE_RET( length == 0 || output != NULL );
+
+    n = *nc_off;
+    if( n >= 8 )
+        return( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA );
 
     while( length-- )
     {
diff --git a/library/camellia.c b/library/camellia.c
index 41b7da0..22262b8 100644
--- a/library/camellia.c
+++ b/library/camellia.c
@@ -49,6 +49,12 @@
 
 #if !defined(MBEDTLS_CAMELLIA_ALT)
 
+/* Parameter validation macros */
+#define CAMELLIA_VALIDATE_RET( cond )                                       \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA )
+#define CAMELLIA_VALIDATE( cond )                                           \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 /*
  * 32-bit integer manipulation macros (big endian)
  */
@@ -321,6 +327,7 @@
 
 void mbedtls_camellia_init( mbedtls_camellia_context *ctx )
 {
+    CAMELLIA_VALIDATE( ctx != NULL );
     memset( ctx, 0, sizeof( mbedtls_camellia_context ) );
 }
 
@@ -335,8 +342,9 @@
 /*
  * Camellia key schedule (encryption)
  */
-int mbedtls_camellia_setkey_enc( mbedtls_camellia_context *ctx, const unsigned char *key,
-                         unsigned int keybits )
+int mbedtls_camellia_setkey_enc( mbedtls_camellia_context *ctx,
+                                 const unsigned char *key,
+                                 unsigned int keybits )
 {
     int idx;
     size_t i;
@@ -346,6 +354,9 @@
     uint32_t KC[16];
     uint32_t TK[20];
 
+    CAMELLIA_VALIDATE_RET( ctx != NULL );
+    CAMELLIA_VALIDATE_RET( key != NULL );
+
     RK = ctx->rk;
 
     memset( t, 0, 64 );
@@ -356,7 +367,7 @@
         case 128: ctx->nr = 3; idx = 0; break;
         case 192:
         case 256: ctx->nr = 4; idx = 1; break;
-        default : return( MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH );
+        default : return( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA );
     }
 
     for( i = 0; i < keybits / 8; ++i )
@@ -440,14 +451,17 @@
 /*
  * Camellia key schedule (decryption)
  */
-int mbedtls_camellia_setkey_dec( mbedtls_camellia_context *ctx, const unsigned char *key,
-                         unsigned int keybits )
+int mbedtls_camellia_setkey_dec( mbedtls_camellia_context *ctx,
+                                 const unsigned char *key,
+                                 unsigned int keybits )
 {
     int idx, ret;
     size_t i;
     mbedtls_camellia_context cty;
     uint32_t *RK;
     uint32_t *SK;
+    CAMELLIA_VALIDATE_RET( ctx != NULL );
+    CAMELLIA_VALIDATE_RET( key != NULL );
 
     mbedtls_camellia_init( &cty );
 
@@ -495,6 +509,11 @@
 {
     int NR;
     uint32_t *RK, X[4];
+    CAMELLIA_VALIDATE_RET( ctx != NULL );
+    CAMELLIA_VALIDATE_RET( mode == MBEDTLS_CAMELLIA_ENCRYPT ||
+                           mode == MBEDTLS_CAMELLIA_DECRYPT );
+    CAMELLIA_VALIDATE_RET( input  != NULL );
+    CAMELLIA_VALIDATE_RET( output != NULL );
 
     ( (void) mode );
 
@@ -552,14 +571,20 @@
  * Camellia-CBC buffer encryption/decryption
  */
 int mbedtls_camellia_crypt_cbc( mbedtls_camellia_context *ctx,
-                    int mode,
-                    size_t length,
-                    unsigned char iv[16],
-                    const unsigned char *input,
-                    unsigned char *output )
+                                int mode,
+                                size_t length,
+                                unsigned char iv[16],
+                                const unsigned char *input,
+                                unsigned char *output )
 {
     int i;
     unsigned char temp[16];
+    CAMELLIA_VALIDATE_RET( ctx != NULL );
+    CAMELLIA_VALIDATE_RET( mode == MBEDTLS_CAMELLIA_ENCRYPT ||
+                           mode == MBEDTLS_CAMELLIA_DECRYPT );
+    CAMELLIA_VALIDATE_RET( iv != NULL );
+    CAMELLIA_VALIDATE_RET( length == 0 || input  != NULL );
+    CAMELLIA_VALIDATE_RET( length == 0 || output != NULL );
 
     if( length % 16 )
         return( MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH );
@@ -614,7 +639,18 @@
                        unsigned char *output )
 {
     int c;
-    size_t n = *iv_off;
+    size_t n;
+    CAMELLIA_VALIDATE_RET( ctx != NULL );
+    CAMELLIA_VALIDATE_RET( mode == MBEDTLS_CAMELLIA_ENCRYPT ||
+                           mode == MBEDTLS_CAMELLIA_DECRYPT );
+    CAMELLIA_VALIDATE_RET( iv     != NULL );
+    CAMELLIA_VALIDATE_RET( iv_off != NULL );
+    CAMELLIA_VALIDATE_RET( length == 0 || input  != NULL );
+    CAMELLIA_VALIDATE_RET( length == 0 || output != NULL );
+
+    n = *iv_off;
+    if( n >= 16 )
+        return( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA );
 
     if( mode == MBEDTLS_CAMELLIA_DECRYPT )
     {
@@ -662,7 +698,17 @@
                        unsigned char *output )
 {
     int c, i;
-    size_t n = *nc_off;
+    size_t n;
+    CAMELLIA_VALIDATE_RET( ctx != NULL );
+    CAMELLIA_VALIDATE_RET( nonce_counter != NULL );
+    CAMELLIA_VALIDATE_RET( stream_block  != NULL );
+    CAMELLIA_VALIDATE_RET( nc_off != NULL );
+    CAMELLIA_VALIDATE_RET( length == 0 || input  != NULL );
+    CAMELLIA_VALIDATE_RET( length == 0 || output != NULL );
+
+    n = *nc_off;
+    if( n >= 16 )
+        return( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA );
 
     while( length-- )
     {
diff --git a/library/ccm.c b/library/ccm.c
index 90cab8e..01e58b0 100644
--- a/library/ccm.c
+++ b/library/ccm.c
@@ -52,6 +52,11 @@
 
 #if !defined(MBEDTLS_CCM_ALT)
 
+#define CCM_VALIDATE_RET( cond ) \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CCM_BAD_INPUT )
+#define CCM_VALIDATE( cond ) \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 #define CCM_ENCRYPT 0
 #define CCM_DECRYPT 1
 
@@ -60,6 +65,7 @@
  */
 void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
 {
+    CCM_VALIDATE( ctx != NULL );
     memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
 }
 
@@ -71,6 +77,9 @@
     int ret;
     const mbedtls_cipher_info_t *cipher_info;
 
+    CCM_VALIDATE_RET( ctx != NULL );
+    CCM_VALIDATE_RET( key != NULL );
+
     cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, MBEDTLS_MODE_ECB );
     if( cipher_info == NULL )
         return( MBEDTLS_ERR_CCM_BAD_INPUT );
@@ -97,6 +106,8 @@
  */
 void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
 {
+    if( ctx == NULL )
+        return;
     mbedtls_cipher_free( &ctx->cipher_ctx );
     mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
 }
@@ -310,6 +321,12 @@
                          const unsigned char *input, unsigned char *output,
                          unsigned char *tag, size_t tag_len )
 {
+    CCM_VALIDATE_RET( ctx != NULL );
+    CCM_VALIDATE_RET( iv != NULL );
+    CCM_VALIDATE_RET( add_len == 0 || add != NULL );
+    CCM_VALIDATE_RET( length == 0 || input != NULL );
+    CCM_VALIDATE_RET( length == 0 || output != NULL );
+    CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
     return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len,
                             add, add_len, input, output, tag, tag_len ) );
 }
@@ -320,6 +337,12 @@
                          const unsigned char *input, unsigned char *output,
                          unsigned char *tag, size_t tag_len )
 {
+    CCM_VALIDATE_RET( ctx != NULL );
+    CCM_VALIDATE_RET( iv != NULL );
+    CCM_VALIDATE_RET( add_len == 0 || add != NULL );
+    CCM_VALIDATE_RET( length == 0 || input != NULL );
+    CCM_VALIDATE_RET( length == 0 || output != NULL );
+    CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
     if( tag_len == 0 )
         return( MBEDTLS_ERR_CCM_BAD_INPUT );
 
@@ -341,6 +364,13 @@
     unsigned char i;
     int diff;
 
+    CCM_VALIDATE_RET( ctx != NULL );
+    CCM_VALIDATE_RET( iv != NULL );
+    CCM_VALIDATE_RET( add_len == 0 || add != NULL );
+    CCM_VALIDATE_RET( length == 0 || input != NULL );
+    CCM_VALIDATE_RET( length == 0 || output != NULL );
+    CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
+
     if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length,
                                 iv, iv_len, add, add_len,
                                 input, output, check_tag, tag_len ) ) != 0 )
@@ -367,6 +397,13 @@
                       const unsigned char *input, unsigned char *output,
                       const unsigned char *tag, size_t tag_len )
 {
+    CCM_VALIDATE_RET( ctx != NULL );
+    CCM_VALIDATE_RET( iv != NULL );
+    CCM_VALIDATE_RET( add_len == 0 || add != NULL );
+    CCM_VALIDATE_RET( length == 0 || input != NULL );
+    CCM_VALIDATE_RET( length == 0 || output != NULL );
+    CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
+
     if( tag_len == 0 )
         return( MBEDTLS_ERR_CCM_BAD_INPUT );
 
diff --git a/library/dhm.c b/library/dhm.c
index 82cbb0c..ee28572 100644
--- a/library/dhm.c
+++ b/library/dhm.c
@@ -60,6 +60,11 @@
 
 #if !defined(MBEDTLS_DHM_ALT)
 
+#define DHM_VALIDATE_RET( cond )    \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_DHM_BAD_INPUT_DATA )
+#define DHM_VALIDATE( cond )        \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 /*
  * helper to validate the mbedtls_mpi size and import it
  */
@@ -121,6 +126,7 @@
 
 void mbedtls_dhm_init( mbedtls_dhm_context *ctx )
 {
+    DHM_VALIDATE( ctx != NULL );
     memset( ctx, 0, sizeof( mbedtls_dhm_context ) );
 }
 
@@ -132,6 +138,9 @@
                      const unsigned char *end )
 {
     int ret;
+    DHM_VALIDATE_RET( ctx != NULL );
+    DHM_VALIDATE_RET( p != NULL && *p != NULL );
+    DHM_VALIDATE_RET( end != NULL );
 
     if( ( ret = dhm_read_bignum( &ctx->P,  p, end ) ) != 0 ||
         ( ret = dhm_read_bignum( &ctx->G,  p, end ) ) != 0 ||
@@ -157,6 +166,10 @@
     int ret, count = 0;
     size_t n1, n2, n3;
     unsigned char *p;
+    DHM_VALIDATE_RET( ctx != NULL );
+    DHM_VALIDATE_RET( output != NULL );
+    DHM_VALIDATE_RET( olen != NULL );
+    DHM_VALIDATE_RET( f_rng != NULL );
 
     if( mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 )
         return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
@@ -227,9 +240,9 @@
                            const mbedtls_mpi *G )
 {
     int ret;
-
-    if( ctx == NULL || P == NULL || G == NULL )
-        return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
+    DHM_VALIDATE_RET( ctx != NULL );
+    DHM_VALIDATE_RET( P != NULL );
+    DHM_VALIDATE_RET( G != NULL );
 
     if( ( ret = mbedtls_mpi_copy( &ctx->P, P ) ) != 0 ||
         ( ret = mbedtls_mpi_copy( &ctx->G, G ) ) != 0 )
@@ -248,8 +261,10 @@
                      const unsigned char *input, size_t ilen )
 {
     int ret;
+    DHM_VALIDATE_RET( ctx != NULL );
+    DHM_VALIDATE_RET( input != NULL );
 
-    if( ctx == NULL || ilen < 1 || ilen > ctx->len )
+    if( ilen < 1 || ilen > ctx->len )
         return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
 
     if( ( ret = mbedtls_mpi_read_binary( &ctx->GY, input, ilen ) ) != 0 )
@@ -267,8 +282,11 @@
                      void *p_rng )
 {
     int ret, count = 0;
+    DHM_VALIDATE_RET( ctx != NULL );
+    DHM_VALIDATE_RET( output != NULL );
+    DHM_VALIDATE_RET( f_rng != NULL );
 
-    if( ctx == NULL || olen < 1 || olen > ctx->len )
+    if( olen < 1 || olen > ctx->len )
         return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
 
     if( mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 )
@@ -380,8 +398,11 @@
 {
     int ret;
     mbedtls_mpi GYb;
+    DHM_VALIDATE_RET( ctx != NULL );
+    DHM_VALIDATE_RET( output != NULL );
+    DHM_VALIDATE_RET( olen != NULL );
 
-    if( ctx == NULL || output_size < ctx->len )
+    if( output_size < ctx->len )
         return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
 
     if( ( ret = dhm_check_range( &ctx->GY, &ctx->P ) ) != 0 )
@@ -428,6 +449,9 @@
  */
 void mbedtls_dhm_free( mbedtls_dhm_context *ctx )
 {
+    if( ctx == NULL )
+        return;
+
     mbedtls_mpi_free( &ctx->pX ); mbedtls_mpi_free( &ctx->Vf );
     mbedtls_mpi_free( &ctx->Vi ); mbedtls_mpi_free( &ctx->RP );
     mbedtls_mpi_free( &ctx->K  ); mbedtls_mpi_free( &ctx->GY );
@@ -449,7 +473,12 @@
     unsigned char *p, *end;
 #if defined(MBEDTLS_PEM_PARSE_C)
     mbedtls_pem_context pem;
+#endif /* MBEDTLS_PEM_PARSE_C */
 
+    DHM_VALIDATE_RET( dhm != NULL );
+    DHM_VALIDATE_RET( dhmin != NULL );
+
+#if defined(MBEDTLS_PEM_PARSE_C)
     mbedtls_pem_init( &pem );
 
     /* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
@@ -596,6 +625,8 @@
     int ret;
     size_t n;
     unsigned char *buf;
+    DHM_VALIDATE_RET( dhm != NULL );
+    DHM_VALIDATE_RET( path != NULL );
 
     if( ( ret = load_file( path, &buf, &n ) ) != 0 )
         return( ret );
diff --git a/library/ecp.c b/library/ecp.c
index 7fefb4c..ecea591 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -86,6 +86,12 @@
 
 #if !defined(MBEDTLS_ECP_ALT)
 
+/* Parameter validation macros based on platform_util.h */
+#define ECP_VALIDATE_RET( cond )    \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
+#define ECP_VALIDATE( cond )        \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 #if defined(MBEDTLS_PLATFORM_C)
 #include "mbedtls/platform.h"
 #else
@@ -238,6 +244,7 @@
  */
 void mbedtls_ecp_restart_init( mbedtls_ecp_restart_ctx *ctx )
 {
+    ECP_VALIDATE( ctx != NULL );
     ctx->ops_done = 0;
     ctx->depth = 0;
     ctx->rsm = NULL;
@@ -268,6 +275,8 @@
                               mbedtls_ecp_restart_ctx *rs_ctx,
                               unsigned ops )
 {
+    ECP_VALIDATE_RET( grp != NULL );
+
     if( rs_ctx != NULL && ecp_max_ops != 0 )
     {
         /* scale depending on curve size: the chosen reference is 256-bit,
@@ -496,6 +505,9 @@
 {
     const mbedtls_ecp_curve_info *curve_info;
 
+    if( name == NULL )
+        return( NULL );
+
     for( curve_info = mbedtls_ecp_curve_list();
          curve_info->grp_id != MBEDTLS_ECP_DP_NONE;
          curve_info++ )
@@ -526,8 +538,7 @@
  */
 void mbedtls_ecp_point_init( mbedtls_ecp_point *pt )
 {
-    if( pt == NULL )
-        return;
+    ECP_VALIDATE( pt != NULL );
 
     mbedtls_mpi_init( &pt->X );
     mbedtls_mpi_init( &pt->Y );
@@ -539,8 +550,7 @@
  */
 void mbedtls_ecp_group_init( mbedtls_ecp_group *grp )
 {
-    if( grp == NULL )
-        return;
+    ECP_VALIDATE( grp != NULL );
 
     grp->id = MBEDTLS_ECP_DP_NONE;
     mbedtls_mpi_init( &grp->P );
@@ -564,8 +574,7 @@
  */
 void mbedtls_ecp_keypair_init( mbedtls_ecp_keypair *key )
 {
-    if( key == NULL )
-        return;
+    ECP_VALIDATE( key != NULL );
 
     mbedtls_ecp_group_init( &key->grp );
     mbedtls_mpi_init( &key->d );
@@ -633,6 +642,8 @@
 int mbedtls_ecp_copy( mbedtls_ecp_point *P, const mbedtls_ecp_point *Q )
 {
     int ret;
+    ECP_VALIDATE_RET( P != NULL );
+    ECP_VALIDATE_RET( Q != NULL );
 
     MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &P->X, &Q->X ) );
     MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &P->Y, &Q->Y ) );
@@ -647,7 +658,10 @@
  */
 int mbedtls_ecp_group_copy( mbedtls_ecp_group *dst, const mbedtls_ecp_group *src )
 {
-    return mbedtls_ecp_group_load( dst, src->id );
+    ECP_VALIDATE_RET( dst != NULL );
+    ECP_VALIDATE_RET( src != NULL );
+
+    return( mbedtls_ecp_group_load( dst, src->id ) );
 }
 
 /*
@@ -656,6 +670,7 @@
 int mbedtls_ecp_set_zero( mbedtls_ecp_point *pt )
 {
     int ret;
+    ECP_VALIDATE_RET( pt != NULL );
 
     MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pt->X , 1 ) );
     MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &pt->Y , 1 ) );
@@ -670,6 +685,8 @@
  */
 int mbedtls_ecp_is_zero( mbedtls_ecp_point *pt )
 {
+    ECP_VALIDATE_RET( pt != NULL );
+
     return( mbedtls_mpi_cmp_int( &pt->Z, 0 ) == 0 );
 }
 
@@ -679,6 +696,9 @@
 int mbedtls_ecp_point_cmp( const mbedtls_ecp_point *P,
                            const mbedtls_ecp_point *Q )
 {
+    ECP_VALIDATE_RET( P != NULL );
+    ECP_VALIDATE_RET( Q != NULL );
+
     if( mbedtls_mpi_cmp_mpi( &P->X, &Q->X ) == 0 &&
         mbedtls_mpi_cmp_mpi( &P->Y, &Q->Y ) == 0 &&
         mbedtls_mpi_cmp_mpi( &P->Z, &Q->Z ) == 0 )
@@ -696,6 +716,9 @@
                            const char *x, const char *y )
 {
     int ret;
+    ECP_VALIDATE_RET( P != NULL );
+    ECP_VALIDATE_RET( x != NULL );
+    ECP_VALIDATE_RET( y != NULL );
 
     MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P->X, radix, x ) );
     MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P->Y, radix, y ) );
@@ -708,16 +731,19 @@
 /*
  * Export a point into unsigned binary data (SEC1 2.3.3)
  */
-int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *P,
-                            int format, size_t *olen,
-                            unsigned char *buf, size_t buflen )
+int mbedtls_ecp_point_write_binary( const mbedtls_ecp_group *grp,
+                                    const mbedtls_ecp_point *P,
+                                    int format, size_t *olen,
+                                    unsigned char *buf, size_t buflen )
 {
     int ret = 0;
     size_t plen;
-
-    if( format != MBEDTLS_ECP_PF_UNCOMPRESSED &&
-        format != MBEDTLS_ECP_PF_COMPRESSED )
-        return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
+    ECP_VALIDATE_RET( grp  != NULL );
+    ECP_VALIDATE_RET( P    != NULL );
+    ECP_VALIDATE_RET( olen != NULL );
+    ECP_VALIDATE_RET( buf  != NULL );
+    ECP_VALIDATE_RET( format == MBEDTLS_ECP_PF_UNCOMPRESSED ||
+                      format == MBEDTLS_ECP_PF_COMPRESSED );
 
     /*
      * Common case: P == 0
@@ -764,11 +790,15 @@
 /*
  * Import a point from unsigned binary data (SEC1 2.3.4)
  */
-int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt,
-                           const unsigned char *buf, size_t ilen )
+int mbedtls_ecp_point_read_binary( const mbedtls_ecp_group *grp,
+                                   mbedtls_ecp_point *pt,
+                                   const unsigned char *buf, size_t ilen )
 {
     int ret;
     size_t plen;
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( pt  != NULL );
+    ECP_VALIDATE_RET( buf != NULL );
 
     if( ilen < 1 )
         return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
@@ -803,11 +833,16 @@
  *          opaque point <1..2^8-1>;
  *      } ECPoint;
  */
-int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp, mbedtls_ecp_point *pt,
-                        const unsigned char **buf, size_t buf_len )
+int mbedtls_ecp_tls_read_point( const mbedtls_ecp_group *grp,
+                                mbedtls_ecp_point *pt,
+                                const unsigned char **buf, size_t buf_len )
 {
     unsigned char data_len;
     const unsigned char *buf_start;
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( pt  != NULL );
+    ECP_VALIDATE_RET( buf != NULL );
+    ECP_VALIDATE_RET( *buf != NULL );
 
     /*
      * We must have at least two bytes (1 for length, at least one for data)
@@ -825,7 +860,7 @@
     buf_start = *buf;
     *buf += data_len;
 
-    return mbedtls_ecp_point_read_binary( grp, pt, buf_start, data_len );
+    return( mbedtls_ecp_point_read_binary( grp, pt, buf_start, data_len ) );
 }
 
 /*
@@ -839,6 +874,12 @@
                          unsigned char *buf, size_t blen )
 {
     int ret;
+    ECP_VALIDATE_RET( grp  != NULL );
+    ECP_VALIDATE_RET( pt   != NULL );
+    ECP_VALIDATE_RET( olen != NULL );
+    ECP_VALIDATE_RET( buf  != NULL );
+    ECP_VALIDATE_RET( format == MBEDTLS_ECP_PF_UNCOMPRESSED ||
+                      format == MBEDTLS_ECP_PF_COMPRESSED );
 
     /*
      * buffer length must be at least one, for our length byte
@@ -867,11 +908,14 @@
 {
     int ret;
     mbedtls_ecp_group_id grp_id;
+    ECP_VALIDATE_RET( grp  != NULL );
+    ECP_VALIDATE_RET( buf  != NULL );
+    ECP_VALIDATE_RET( *buf != NULL );
 
     if( ( ret = mbedtls_ecp_tls_read_group_id( &grp_id, buf, len ) ) != 0 )
         return( ret );
 
-    return mbedtls_ecp_group_load( grp, grp_id );
+    return( mbedtls_ecp_group_load( grp, grp_id ) );
 }
 
 /*
@@ -883,6 +927,9 @@
 {
     uint16_t tls_id;
     const mbedtls_ecp_curve_info *curve_info;
+    ECP_VALIDATE_RET( grp  != NULL );
+    ECP_VALIDATE_RET( buf  != NULL );
+    ECP_VALIDATE_RET( *buf != NULL );
 
     /*
      * We expect at least three bytes (see below)
@@ -918,6 +965,9 @@
                          unsigned char *buf, size_t blen )
 {
     const mbedtls_ecp_curve_info *curve_info;
+    ECP_VALIDATE_RET( grp  != NULL );
+    ECP_VALIDATE_RET( buf  != NULL );
+    ECP_VALIDATE_RET( olen != NULL );
 
     if( ( curve_info = mbedtls_ecp_curve_info_from_grp_id( grp->id ) ) == NULL )
         return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
@@ -2276,6 +2326,10 @@
 #if defined(MBEDTLS_ECP_INTERNAL_ALT)
     char is_grp_capable = 0;
 #endif
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( R   != NULL );
+    ECP_VALIDATE_RET( m   != NULL );
+    ECP_VALIDATE_RET( P   != NULL );
 
 #if defined(MBEDTLS_ECP_RESTARTABLE)
     /* reset ops count for this call if top-level */
@@ -2333,6 +2387,10 @@
              const mbedtls_mpi *m, const mbedtls_ecp_point *P,
              int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
 {
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( R   != NULL );
+    ECP_VALIDATE_RET( m   != NULL );
+    ECP_VALIDATE_RET( P   != NULL );
     return( mbedtls_ecp_mul_restartable( grp, R, m, P, f_rng, p_rng, NULL ) );
 }
 
@@ -2435,6 +2493,12 @@
 #if defined(MBEDTLS_ECP_INTERNAL_ALT)
     char is_grp_capable = 0;
 #endif
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( R   != NULL );
+    ECP_VALIDATE_RET( m   != NULL );
+    ECP_VALIDATE_RET( P   != NULL );
+    ECP_VALIDATE_RET( n   != NULL );
+    ECP_VALIDATE_RET( Q   != NULL );
 
     if( ecp_get_type( grp ) != ECP_TYPE_SHORT_WEIERSTRASS )
         return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
@@ -2517,6 +2581,12 @@
              const mbedtls_mpi *m, const mbedtls_ecp_point *P,
              const mbedtls_mpi *n, const mbedtls_ecp_point *Q )
 {
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( R   != NULL );
+    ECP_VALIDATE_RET( m   != NULL );
+    ECP_VALIDATE_RET( P   != NULL );
+    ECP_VALIDATE_RET( n   != NULL );
+    ECP_VALIDATE_RET( Q   != NULL );
     return( mbedtls_ecp_muladd_restartable( grp, R, m, P, n, Q, NULL ) );
 }
 
@@ -2539,8 +2609,12 @@
 /*
  * Check that a point is valid as a public key
  */
-int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp, const mbedtls_ecp_point *pt )
+int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp,
+                              const mbedtls_ecp_point *pt )
 {
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( pt  != NULL );
+
     /* Must use affine coordinates */
     if( mbedtls_mpi_cmp_int( &pt->Z, 1 ) != 0 )
         return( MBEDTLS_ERR_ECP_INVALID_KEY );
@@ -2559,8 +2633,12 @@
 /*
  * Check that an mbedtls_mpi is valid as a private key
  */
-int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp, const mbedtls_mpi *d )
+int mbedtls_ecp_check_privkey( const mbedtls_ecp_group *grp,
+                               const mbedtls_mpi *d )
 {
+    ECP_VALIDATE_RET( grp != NULL );
+    ECP_VALIDATE_RET( d   != NULL );
+
 #if defined(ECP_MONTGOMERY)
     if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
     {
@@ -2601,7 +2679,13 @@
                      void *p_rng )
 {
     int ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
-    size_t n_size = ( grp->nbits + 7 ) / 8;
+    size_t n_size;
+
+    ECP_VALIDATE_RET( grp   != NULL );
+    ECP_VALIDATE_RET( d     != NULL );
+    ECP_VALIDATE_RET( f_rng != NULL );
+
+    n_size = ( grp->nbits + 7 ) / 8;
 
 #if defined(ECP_MONTGOMERY)
     if( ecp_get_type( grp ) == ECP_TYPE_MONTGOMERY )
@@ -2680,6 +2764,11 @@
                      void *p_rng )
 {
     int ret;
+    ECP_VALIDATE_RET( grp   != NULL );
+    ECP_VALIDATE_RET( d     != NULL );
+    ECP_VALIDATE_RET( G     != NULL );
+    ECP_VALIDATE_RET( Q     != NULL );
+    ECP_VALIDATE_RET( f_rng != NULL );
 
     MBEDTLS_MPI_CHK( mbedtls_ecp_gen_privkey( grp, d, f_rng, p_rng ) );
     MBEDTLS_MPI_CHK( mbedtls_ecp_mul( grp, Q, d, G, f_rng, p_rng ) );
@@ -2696,6 +2785,11 @@
                              int (*f_rng)(void *, unsigned char *, size_t),
                              void *p_rng )
 {
+    ECP_VALIDATE_RET( grp   != NULL );
+    ECP_VALIDATE_RET( d     != NULL );
+    ECP_VALIDATE_RET( Q     != NULL );
+    ECP_VALIDATE_RET( f_rng != NULL );
+
     return( mbedtls_ecp_gen_keypair_base( grp, &grp->G, d, Q, f_rng, p_rng ) );
 }
 
@@ -2706,6 +2800,8 @@
                 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
 {
     int ret;
+    ECP_VALIDATE_RET( key   != NULL );
+    ECP_VALIDATE_RET( f_rng != NULL );
 
     if( ( ret = mbedtls_ecp_group_load( &key->grp, grp_id ) ) != 0 )
         return( ret );
@@ -2721,6 +2817,8 @@
     int ret;
     mbedtls_ecp_point Q;
     mbedtls_ecp_group grp;
+    ECP_VALIDATE_RET( pub != NULL );
+    ECP_VALIDATE_RET( prv != NULL );
 
     if( pub->grp.id == MBEDTLS_ECP_DP_NONE ||
         pub->grp.id != prv->grp.id ||
diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 68e2441..731621d 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -28,11 +28,18 @@
 #if defined(MBEDTLS_ECP_C)
 
 #include "mbedtls/ecp.h"
+#include "mbedtls/platform_util.h"
 
 #include <string.h>
 
 #if !defined(MBEDTLS_ECP_ALT)
 
+/* Parameter validation macros based on platform_util.h */
+#define ECP_VALIDATE_RET( cond )    \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
+#define ECP_VALIDATE( cond )        \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
     !defined(inline) && !defined(__cplusplus)
 #define inline __inline
@@ -746,6 +753,7 @@
  */
 int mbedtls_ecp_group_load( mbedtls_ecp_group *grp, mbedtls_ecp_group_id id )
 {
+    ECP_VALIDATE_RET( grp != NULL );
     mbedtls_ecp_group_free( grp );
 
     grp->id = id;
diff --git a/library/error.c b/library/error.c
index eabee9e..3be4175 100644
--- a/library/error.c
+++ b/library/error.c
@@ -618,8 +618,8 @@
 #endif /* MBEDTLS_ARC4_C */
 
 #if defined(MBEDTLS_ARIA_C)
-    if( use_ret == -(MBEDTLS_ERR_ARIA_INVALID_KEY_LENGTH) )
-        mbedtls_snprintf( buf, buflen, "ARIA - Invalid key length" );
+    if( use_ret == -(MBEDTLS_ERR_ARIA_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "ARIA - Bad input data" );
     if( use_ret == -(MBEDTLS_ERR_ARIA_INVALID_INPUT_LENGTH) )
         mbedtls_snprintf( buf, buflen, "ARIA - Invalid data input length" );
     if( use_ret == -(MBEDTLS_ERR_ARIA_FEATURE_UNAVAILABLE) )
@@ -672,17 +672,17 @@
 #endif /* MBEDTLS_BIGNUM_C */
 
 #if defined(MBEDTLS_BLOWFISH_C)
-    if( use_ret == -(MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH) )
-        mbedtls_snprintf( buf, buflen, "BLOWFISH - Invalid key length" );
-    if( use_ret == -(MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED) )
-        mbedtls_snprintf( buf, buflen, "BLOWFISH - Blowfish hardware accelerator failed" );
+    if( use_ret == -(MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "BLOWFISH - Bad input data" );
     if( use_ret == -(MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH) )
         mbedtls_snprintf( buf, buflen, "BLOWFISH - Invalid data input length" );
+    if( use_ret == -(MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED) )
+        mbedtls_snprintf( buf, buflen, "BLOWFISH - Blowfish hardware accelerator failed" );
 #endif /* MBEDTLS_BLOWFISH_C */
 
 #if defined(MBEDTLS_CAMELLIA_C)
-    if( use_ret == -(MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH) )
-        mbedtls_snprintf( buf, buflen, "CAMELLIA - Invalid key length" );
+    if( use_ret == -(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "CAMELLIA - Bad input data" );
     if( use_ret == -(MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH) )
         mbedtls_snprintf( buf, buflen, "CAMELLIA - Invalid data input length" );
     if( use_ret == -(MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED) )
diff --git a/library/gcm.c b/library/gcm.c
index c486ef7..675926a 100644
--- a/library/gcm.c
+++ b/library/gcm.c
@@ -57,6 +57,12 @@
 
 #if !defined(MBEDTLS_GCM_ALT)
 
+/* Parameter validation macros */
+#define GCM_VALIDATE_RET( cond ) \
+    MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_GCM_BAD_INPUT )
+#define GCM_VALIDATE( cond ) \
+    MBEDTLS_INTERNAL_VALIDATE( cond )
+
 /*
  * 32-bit integer manipulation macros (big endian)
  */
@@ -85,6 +91,7 @@
  */
 void mbedtls_gcm_init( mbedtls_gcm_context *ctx )
 {
+    GCM_VALIDATE( ctx != NULL );
     memset( ctx, 0, sizeof( mbedtls_gcm_context ) );
 }
 
@@ -164,6 +171,10 @@
     int ret;
     const mbedtls_cipher_info_t *cipher_info;
 
+    GCM_VALIDATE_RET( ctx != NULL );
+    GCM_VALIDATE_RET( key != NULL );
+    GCM_VALIDATE_RET( keybits == 128 || keybits == 192 || keybits == 256 );
+
     cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, MBEDTLS_MODE_ECB );
     if( cipher_info == NULL )
         return( MBEDTLS_ERR_GCM_BAD_INPUT );
@@ -274,6 +285,10 @@
     const unsigned char *p;
     size_t use_len, olen = 0;
 
+    GCM_VALIDATE_RET( ctx != NULL );
+    GCM_VALIDATE_RET( iv != NULL );
+    GCM_VALIDATE_RET( add_len == 0 || add != NULL );
+
     /* IV and AD are limited to 2^64 bits, so 2^61 bytes */
     /* IV is not allowed to be zero length */
     if( iv_len == 0 ||
@@ -356,6 +371,10 @@
     unsigned char *out_p = output;
     size_t use_len, olen = 0;
 
+    GCM_VALIDATE_RET( ctx != NULL );
+    GCM_VALIDATE_RET( length == 0 || input != NULL );
+    GCM_VALIDATE_RET( length == 0 || output != NULL );
+
     if( output > input && (size_t) ( output - input ) < length )
         return( MBEDTLS_ERR_GCM_BAD_INPUT );
 
@@ -409,8 +428,14 @@
 {
     unsigned char work_buf[16];
     size_t i;
-    uint64_t orig_len = ctx->len * 8;
-    uint64_t orig_add_len = ctx->add_len * 8;
+    uint64_t orig_len;
+    uint64_t orig_add_len;
+
+    GCM_VALIDATE_RET( ctx != NULL );
+    GCM_VALIDATE_RET( tag != NULL );
+
+    orig_len = ctx->len * 8;
+    orig_add_len = ctx->add_len * 8;
 
     if( tag_len > 16 || tag_len < 4 )
         return( MBEDTLS_ERR_GCM_BAD_INPUT );
@@ -452,6 +477,13 @@
 {
     int ret;
 
+    GCM_VALIDATE_RET( ctx != NULL );
+    GCM_VALIDATE_RET( iv != NULL );
+    GCM_VALIDATE_RET( add_len == 0 || add != NULL );
+    GCM_VALIDATE_RET( length == 0 || input != NULL );
+    GCM_VALIDATE_RET( length == 0 || output != NULL );
+    GCM_VALIDATE_RET( tag != NULL );
+
     if( ( ret = mbedtls_gcm_starts( ctx, mode, iv, iv_len, add, add_len ) ) != 0 )
         return( ret );
 
@@ -480,6 +512,13 @@
     size_t i;
     int diff;
 
+    GCM_VALIDATE_RET( ctx != NULL );
+    GCM_VALIDATE_RET( iv != NULL );
+    GCM_VALIDATE_RET( add_len == 0 || add != NULL );
+    GCM_VALIDATE_RET( tag != NULL );
+    GCM_VALIDATE_RET( length == 0 || input != NULL );
+    GCM_VALIDATE_RET( length == 0 || output != NULL );
+
     if( ( ret = mbedtls_gcm_crypt_and_tag( ctx, MBEDTLS_GCM_DECRYPT, length,
                                    iv, iv_len, add, add_len,
                                    input, output, tag_len, check_tag ) ) != 0 )
@@ -502,6 +541,8 @@
 
 void mbedtls_gcm_free( mbedtls_gcm_context *ctx )
 {
+    if( ctx == NULL )
+        return;
     mbedtls_cipher_free( &ctx->cipher_ctx );
     mbedtls_platform_zeroize( ctx, sizeof( mbedtls_gcm_context ) );
 }
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 58126be..9e15249 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -92,6 +92,7 @@
 add_test_suite(gcm gcm.aes192_de)
 add_test_suite(gcm gcm.aes256_de)
 add_test_suite(gcm gcm.camellia)
+add_test_suite(gcm gcm.misc)
 add_test_suite(hkdf)
 add_test_suite(hmac_drbg hmac_drbg.misc)
 add_test_suite(hmac_drbg hmac_drbg.no_reseed)
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index 64cb695..c5c0c3a 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -621,6 +621,7 @@
 
 msg "build+test: MBEDTLS_CHECK_PARAMS without MBEDTLS_PLATFORM_C"
 cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
 scripts/config.pl full # includes CHECK_PARAMS
 scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
 scripts/config.pl unset MBEDTLS_MEMORY_BUFFER_ALLOC_C
@@ -636,6 +637,7 @@
 
 msg "build+test: MBEDTLS_CHECK_PARAMS with alternative MBEDTLS_PARAM_FAILED()"
 cleanup
+cp "$CONFIG_H" "$CONFIG_BAK"
 scripts/config.pl full # includes CHECK_PARAMS
 scripts/config.pl unset MBEDTLS_MEMORY_BACKTRACE # too slow for tests
 sed -i 's/.*\(#define MBEDTLS_PARAM_FAILED( cond )\).*/\1/' "$CONFIG_H"
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 3aa5cd6..2e227f0 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -632,4 +632,3 @@
     }
     return ret;
 }
-
diff --git a/tests/suites/test_suite_aes.function b/tests/suites/test_suite_aes.function
index 1315650..da8c1e9 100644
--- a/tests/suites/test_suite_aes.function
+++ b/tests/suites/test_suite_aes.function
@@ -194,8 +194,8 @@
 void aes_crypt_xts_size( int size, int retval )
 {
     mbedtls_aes_xts_context ctx;
-    const unsigned char *src = NULL;
-    unsigned char *output = NULL;
+    const unsigned char src[16] = { 0 };
+    unsigned char output[16];
     unsigned char data_unit[16];
     size_t length = size;
 
@@ -203,10 +203,8 @@
     memset( data_unit, 0x00, sizeof( data_unit ) );
 
 
-    /* Note that this function will most likely crash on failure, as NULL
-     * parameters will be used. In the passing case, the length check in
-     * mbedtls_aes_crypt_xts() will prevent any accesses to parameters by
-     * exiting the function early. */
+    /* Valid pointers are passed for builds with MBEDTLS_CHECK_PARAMS, as
+     * otherwise we wouldn't get to the size check we're interested in. */
     TEST_ASSERT( mbedtls_aes_crypt_xts( &ctx, MBEDTLS_AES_ENCRYPT, length, data_unit, src, output ) == retval );
 }
 /* END_CASE */
@@ -215,7 +213,7 @@
 void aes_crypt_xts_keysize( int size, int retval )
 {
     mbedtls_aes_xts_context ctx;
-    const unsigned char *key = NULL;
+    const unsigned char key[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
     size_t key_len = size;
 
     mbedtls_aes_xts_init( &ctx );
@@ -372,39 +370,255 @@
 /* END_CASE */
 
 /* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
-void aes_invalid_param( )
+void aes_check_params( )
 {
-    mbedtls_aes_context dummy_ctx;
+    mbedtls_aes_context aes_ctx;
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    mbedtls_aes_xts_context xts_ctx;
+#endif
     const unsigned char key[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
+    const unsigned char in[16] = { 0 };
+    unsigned char out[16];
+    size_t size;
+    const int valid_mode = MBEDTLS_AES_ENCRYPT;
+    const int invalid_mode = 42;
 
     TEST_INVALID_PARAM( mbedtls_aes_init( NULL ) );
-
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
     TEST_INVALID_PARAM( mbedtls_aes_xts_init( NULL ) );
+#endif
 
-    /* mbedtls_aes_setkey_enc() */
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
                             mbedtls_aes_setkey_enc( NULL, key, 128 ) );
-
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
-                            mbedtls_aes_setkey_enc( &dummy_ctx, NULL, 128 ) );
+                            mbedtls_aes_setkey_enc( &aes_ctx, NULL, 128 ) );
 
-    /* mbedtls_aes_setkey_dec() */
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
                             mbedtls_aes_setkey_dec( NULL, key, 128 ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_setkey_dec( &aes_ctx, NULL, 128 ) );
+
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_xts_setkey_enc( NULL, key, 128 ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_xts_setkey_enc( &xts_ctx, NULL, 128 ) );
 
     TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
-                            mbedtls_aes_setkey_dec( &dummy_ctx, NULL, 128 ) );
+                            mbedtls_aes_xts_setkey_dec( NULL, key, 128 ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_xts_setkey_dec( &xts_ctx, NULL, 128 ) );
+#endif
+
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ecb( NULL,
+                                                   valid_mode, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ecb( &aes_ctx,
+                                                   invalid_mode, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ecb( &aes_ctx,
+                                                   valid_mode, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ecb( &aes_ctx,
+                                                   valid_mode, in, NULL ) );
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cbc( NULL,
+                                                   valid_mode, 16,
+                                                   out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cbc( &aes_ctx,
+                                                   invalid_mode, 16,
+                                                   out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cbc( &aes_ctx,
+                                                   valid_mode, 16,
+                                                   NULL, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cbc( &aes_ctx,
+                                                   valid_mode, 16,
+                                                   out, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cbc( &aes_ctx,
+                                                   valid_mode, 16,
+                                                   out, in, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
+
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_xts( NULL,
+                                                   valid_mode, 16,
+                                                   in, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_xts( &xts_ctx,
+                                                   invalid_mode, 16,
+                                                   in, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_xts( &xts_ctx,
+                                                   valid_mode, 16,
+                                                   NULL, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_xts( &xts_ctx,
+                                                   valid_mode, 16,
+                                                   in, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_xts( &xts_ctx,
+                                                   valid_mode, 16,
+                                                   in, in, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_XTS */
+
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb128( NULL,
+                                                      valid_mode, 16,
+                                                      &size, out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb128( &aes_ctx,
+                                                      invalid_mode, 16,
+                                                      &size, out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb128( &aes_ctx,
+                                                      valid_mode, 16,
+                                                      NULL, out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb128( &aes_ctx,
+                                                      valid_mode, 16,
+                                                      &size, NULL, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb128( &aes_ctx,
+                                                      valid_mode, 16,
+                                                      &size, out, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb128( &aes_ctx,
+                                                      valid_mode, 16,
+                                                      &size, out, in, NULL ) );
+
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb8( NULL,
+                                                    valid_mode, 16,
+                                                    out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb8( &aes_ctx,
+                                                    invalid_mode, 16,
+                                                    out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb8( &aes_ctx,
+                                                    valid_mode, 16,
+                                                    NULL, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb8( &aes_ctx,
+                                                    valid_mode, 16,
+                                                    out, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_cfb8( &aes_ctx,
+                                                    valid_mode, 16,
+                                                    out, in, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CFB */
+
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ofb( NULL, 16,
+                                                   &size, out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ofb( &aes_ctx, 16,
+                                                   NULL, out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ofb( &aes_ctx, 16,
+                                                   &size, NULL, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ofb( &aes_ctx, 16,
+                                                   &size, out, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ofb( &aes_ctx, 16,
+                                                   &size, out, in, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_OFB */
+
+#if defined(MBEDTLS_CIPHER_MODE_CTR)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ctr( NULL, 16, &size, out,
+                                                   out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ctr( &aes_ctx, 16, NULL, out,
+                                                   out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ctr( &aes_ctx, 16, &size, NULL,
+                                                   out, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ctr( &aes_ctx, 16, &size, out,
+                                                   NULL, in, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ctr( &aes_ctx, 16, &size, out,
+                                                   out, NULL, out ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_AES_BAD_INPUT_DATA,
+                            mbedtls_aes_crypt_ctr( &aes_ctx, 16, &size, out,
+                                                   out, in, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CTR */
 }
 /* END_CASE */
 
 /* BEGIN_CASE */
-void aes_valid_param( )
+void aes_misc_params( )
 {
+#if defined(MBEDTLS_CIPHER_MODE_CBC) || \
+    defined(MBEDTLS_CIPHER_MODE_XTS) || \
+    defined(MBEDTLS_CIPHER_MODE_CFB) || \
+    defined(MBEDTLS_CIPHER_MODE_OFB)
+    mbedtls_aes_context aes_ctx;
+    const unsigned char in[16] = { 0 };
+    unsigned char out[16];
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    mbedtls_aes_xts_context xts_ctx;
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_CFB) || \
+    defined(MBEDTLS_CIPHER_MODE_OFB)
+    size_t size;
+#endif
+
     /* These calls accept NULL */
     TEST_VALID_PARAM( mbedtls_aes_free( NULL ) );
 #if defined(MBEDTLS_CIPHER_MODE_XTS)
     TEST_VALID_PARAM( mbedtls_aes_xts_free( NULL ) );
 #endif
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    TEST_ASSERT( mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_ENCRYPT,
+                                        15,
+                                        out, in, out )
+                 == MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH );
+    TEST_ASSERT( mbedtls_aes_crypt_cbc( &aes_ctx, MBEDTLS_AES_ENCRYPT,
+                                        17,
+                                        out, in, out )
+                 == MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH );
+#endif
+
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    TEST_ASSERT( mbedtls_aes_crypt_xts( &xts_ctx, MBEDTLS_AES_ENCRYPT,
+                                        15,
+                                        in, in, out )
+                 == MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH );
+    TEST_ASSERT( mbedtls_aes_crypt_xts( &xts_ctx, MBEDTLS_AES_ENCRYPT,
+                                        (1 << 24) + 1,
+                                        in, in, out )
+                 == MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH );
+#endif
+
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    size = 16;
+    TEST_ASSERT( mbedtls_aes_crypt_cfb128( &aes_ctx, MBEDTLS_AES_ENCRYPT, 16,
+                                           &size, out, in, out )
+                 == MBEDTLS_ERR_AES_BAD_INPUT_DATA );
+#endif
+
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+    size = 16;
+    TEST_ASSERT( mbedtls_aes_crypt_ofb( &aes_ctx, 16, &size, out, in, out )
+                 == MBEDTLS_ERR_AES_BAD_INPUT_DATA );
+#endif
 }
 /* END_CASE */
 
diff --git a/tests/suites/test_suite_aes.rest.data b/tests/suites/test_suite_aes.rest.data
index a5d843d..6a76b43 100644
--- a/tests/suites/test_suite_aes.rest.data
+++ b/tests/suites/test_suite_aes.rest.data
@@ -10,11 +10,11 @@
 AES-256-CBC Decrypt (Invalid input length)
 aes_decrypt_cbc:"0000000000000000000000000000000000000000000000000000000000000000":"00000000000000000000000000000000":"623a52fcea5d443e48d9181ab32c74":"":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH
 
-AES - Invalid parameters
-aes_invalid_param:
+AES - Optional Parameter Validation (MBEDTLS_CHECK_PARAMS)
+aes_check_params:
 
-AES - Valid parameters
-aes_valid_param:
+AES - Mandatory Parameter Validation and Valid Parameters
+aes_misc_params:
 
 AES Selftest
 depends_on:MBEDTLS_SELF_TEST
diff --git a/tests/suites/test_suite_aria.data b/tests/suites/test_suite_aria.data
index 8cb2d2a..2da0b30 100644
--- a/tests/suites/test_suite_aria.data
+++ b/tests/suites/test_suite_aria.data
@@ -1,3 +1,9 @@
+ARIA - Valid parameters
+aria_valid_param:
+
+ARIA - Invalid parameters
+aria_invalid_param:
+
 ARIA-128-ECB Encrypt - RFC 5794
 aria_encrypt_ecb:"000102030405060708090a0b0c0d0e0f":"00112233445566778899aabbccddeeff":"d718fbd6ab644c739da95f3be6451778":0
 
diff --git a/tests/suites/test_suite_aria.function b/tests/suites/test_suite_aria.function
index 4e39078..7e35f15 100644
--- a/tests/suites/test_suite_aria.function
+++ b/tests/suites/test_suite_aria.function
@@ -17,6 +17,195 @@
  */
 
 /* BEGIN_CASE */
+void aria_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_aria_free( NULL ) );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void aria_invalid_param( )
+{
+    mbedtls_aria_context ctx;
+    unsigned char key[128 / 8] = { 0 };
+    unsigned char input[MBEDTLS_ARIA_BLOCKSIZE] = { 0 };
+    unsigned char output[MBEDTLS_ARIA_BLOCKSIZE] = { 0 };
+    unsigned char iv[MBEDTLS_ARIA_BLOCKSIZE] = { 0 };
+    size_t iv_off = 0;
+
+    ((void) iv_off);
+    ((void) iv);
+
+    TEST_INVALID_PARAM( mbedtls_aria_init( NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_setkey_enc( NULL, key,
+                                                     sizeof( key ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_setkey_enc( &ctx, NULL,
+                                                     sizeof( key ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_setkey_dec( NULL, key,
+                                                     sizeof( key ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_setkey_dec( &ctx, NULL,
+                                                     sizeof( key ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ecb( NULL, input, output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ecb( &ctx, NULL, output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ecb( &ctx, input, NULL ) );
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cbc( NULL,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cbc( &ctx,
+                                                    42 /* invalid mode */,
+                                                    sizeof( input ),
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cbc( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    NULL,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cbc( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    iv,
+                                                    NULL,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cbc( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    iv,
+                                                    input,
+                                                    NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
+
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cfb128( NULL,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cfb128( &ctx,
+                                                    42, /* invalid mode */
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cfb128( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    NULL,
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cfb128( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    NULL,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cfb128( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    NULL,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_cfb128( &ctx,
+                                                    MBEDTLS_ARIA_ENCRYPT,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    input,
+                                                    NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CFB */
+
+#if defined(MBEDTLS_CIPHER_MODE_CTR)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ctr( NULL,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ctr( &ctx,
+                                                    sizeof( input ),
+                                                    NULL,
+                                                    iv,
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ctr( &ctx,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    NULL,
+                                                    iv,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ctr( &ctx,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    NULL,
+                                                    input,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ctr( &ctx,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    iv,
+                                                    NULL,
+                                                    output ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ARIA_BAD_INPUT_DATA,
+                            mbedtls_aria_crypt_ctr( &ctx,
+                                                    sizeof( input ),
+                                                    &iv_off,
+                                                    iv,
+                                                    iv,
+                                                    input,
+                                                    NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CTR */
+
+exit:
+    return;
+
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
 void aria_encrypt_ecb( char *hex_key_string, char *hex_src_string,
                        char *hex_dst_string, int setkey_result )
 {
diff --git a/tests/suites/test_suite_blowfish.data b/tests/suites/test_suite_blowfish.data
index 1ba311f..fd172d3 100644
--- a/tests/suites/test_suite_blowfish.data
+++ b/tests/suites/test_suite_blowfish.data
@@ -1,3 +1,9 @@
+BLOWFISH - Valid parameters
+blowfish_valid_param:
+
+BLOWFISH - Invalid parameters
+blowfish_invalid_param:
+
 BLOWFISH-ECB Encrypt SSLeay reference #1
 blowfish_encrypt_ecb:"0000000000000000":"0000000000000000":"4ef997456198dd78":0
 
@@ -203,13 +209,13 @@
 blowfish_decrypt_ecb:"fedcba9876543210":"6b5c5a9c5d9e0a5a":"ffffffffffffffff":0
 
 BLOWFISH-SETKEY Setkey SSLeay reference #1
-blowfish_encrypt_ecb:"f0":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-SETKEY Setkey SSLeay reference #2
-blowfish_encrypt_ecb:"f0e1":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0e1":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-SETKEY Setkey SSLeay reference #3
-blowfish_encrypt_ecb:"f0e1d2":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0e1d2":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-SETKEY Setkey SSLeay reference #4
 blowfish_encrypt_ecb:"f0e1d2c3":"fedcba9876543210":"be1e639408640f05":0
@@ -281,7 +287,7 @@
 blowfish_encrypt_ecb:"f0e1d2c3b4a5968778695a4b3c2d1e0f00112233445566778899aabbccddeeff0123456789abcdef0102030405060708090a0b0c0d0e0fff":"fedcba9876543210":"2fb3ab7f0ee91b69":0
 
 BLOWFISH-SETKEY Setkey 456 bits
-blowfish_encrypt_ecb:"f0e1d2c3b4a5968778695a4b3c2d1e0f00112233445566778899aabbccddeeff0123456789abcdef0102030405060708090a0b0c0d0e0fffff":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH
+blowfish_encrypt_ecb:"f0e1d2c3b4a5968778695a4b3c2d1e0f00112233445566778899aabbccddeeff0123456789abcdef0102030405060708090a0b0c0d0e0fffff":"fedcba9876543210":"":MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA
 
 BLOWFISH-CBC Encrypt
 blowfish_encrypt_cbc:"0123456789ABCDEFF0E1D2C3B4A59687":"FEDCBA9876543210":"37363534333231204E6F77206973207468652074696D6520666F722000000000":"6b77b4d63006dee605b156e27403979358deb9e7154616d959f1652bd5ff92cc":0
diff --git a/tests/suites/test_suite_blowfish.function b/tests/suites/test_suite_blowfish.function
index 189e23d..7a93cd1 100644
--- a/tests/suites/test_suite_blowfish.function
+++ b/tests/suites/test_suite_blowfish.function
@@ -8,6 +8,164 @@
  */
 
 /* BEGIN_CASE */
+void blowfish_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_blowfish_free( NULL ) );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void blowfish_invalid_param( )
+{
+    mbedtls_blowfish_context ctx;
+    unsigned char buf[16] = { 0 };
+    size_t const valid_keylength = sizeof( buf ) * 8;
+    size_t valid_mode = MBEDTLS_BLOWFISH_ENCRYPT;
+    size_t invalid_mode = 42;
+    size_t off;
+    ((void) off);
+
+    TEST_INVALID_PARAM( mbedtls_blowfish_init( NULL ) );
+    TEST_VALID_PARAM( mbedtls_blowfish_free( NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_setkey( NULL,
+                                                     buf,
+                                                     valid_keylength ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_setkey( &ctx,
+                                                     NULL,
+                                                     valid_keylength ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ecb( NULL,
+                                                     valid_mode,
+                                                     buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ecb( &ctx,
+                                                        invalid_mode,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ecb( &ctx,
+                                                        valid_mode,
+                                                        NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ecb( &ctx,
+                                                        valid_mode,
+                                                        buf, NULL ) );
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cbc( NULL,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        buf, buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cbc( &ctx,
+                                                        invalid_mode,
+                                                        sizeof( buf ),
+                                                        buf, buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cbc( &ctx,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        NULL, buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cbc( &ctx,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        buf, NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cbc( &ctx,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        buf, buf, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
+
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cfb64( NULL,
+                                                          valid_mode,
+                                                          sizeof( buf ),
+                                                          &off, buf,
+                                                          buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cfb64( &ctx,
+                                                          invalid_mode,
+                                                          sizeof( buf ),
+                                                          &off, buf,
+                                                          buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cfb64( &ctx,
+                                                          valid_mode,
+                                                          sizeof( buf ),
+                                                          NULL, buf,
+                                                          buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cfb64( &ctx,
+                                                          valid_mode,
+                                                          sizeof( buf ),
+                                                          &off, NULL,
+                                                          buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cfb64( &ctx,
+                                                          valid_mode,
+                                                          sizeof( buf ),
+                                                          &off, buf,
+                                                          NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_cfb64( &ctx,
+                                                          valid_mode,
+                                                          sizeof( buf ),
+                                                          &off, buf,
+                                                          buf, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CFB */
+
+#if defined(MBEDTLS_CIPHER_MODE_CTR)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ctr( NULL,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, buf,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        NULL,
+                                                        buf, buf,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        NULL, buf,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, NULL,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, buf,
+                                                        NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_BLOWFISH_BAD_INPUT_DATA,
+                            mbedtls_blowfish_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, buf,
+                                                        buf, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CTR */
+
+exit:
+    return;
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
 void blowfish_encrypt_ecb( data_t * key_str, data_t * src_str,
                            data_t * hex_dst_string, int setkey_result )
 {
diff --git a/tests/suites/test_suite_camellia.data b/tests/suites/test_suite_camellia.data
index 1429838..671d570 100644
--- a/tests/suites/test_suite_camellia.data
+++ b/tests/suites/test_suite_camellia.data
@@ -1,3 +1,9 @@
+Camellia - Valid parameters
+camellia_valid_param:
+
+Camellia - Invalid parameters
+camellia_invalid_param:
+
 Camellia-128-ECB Encrypt RFC3713 #1
 camellia_encrypt_ecb:"0123456789abcdeffedcba9876543210":"0123456789abcdeffedcba9876543210":"67673138549669730857065648eabe43":0
 
@@ -185,10 +191,10 @@
 camellia_decrypt_cfb128:"603DEB1015CA71BE2B73AEF0857D77811F352C073B6108D72D9810A30914DFF4":"555FC3F34BDD2D54C62D9E3BF338C1C4":"F69F2445DF4F9B17AD2B417BE66C3710":"5953ADCE14DB8C7F39F1BD39F359BFFA"
 
 Camellia-ECB Encrypt (Invalid key length)
-camellia_encrypt_ecb:"0123456789abcdeffedcba98765432":"0123456789abcdeffedcba9876543210":"67673138549669730857065648eabe43":MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
+camellia_encrypt_ecb:"0123456789abcdeffedcba98765432":"0123456789abcdeffedcba9876543210":"67673138549669730857065648eabe43":MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA
 
 Camellia-ECB Decrypt (Invalid key length)
-camellia_decrypt_ecb:"0123456789abcdeffedcba98765432":"0123456789abcdeffedcba9876543210":"67673138549669730857065648eabe43":MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH
+camellia_decrypt_ecb:"0123456789abcdeffedcba98765432":"0123456789abcdeffedcba9876543210":"67673138549669730857065648eabe43":MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA
 
 Camellia-256-CBC Encrypt (Invalid input length)
 camellia_encrypt_cbc:"0000000000000000000000000000000000000000000000000000000000000000":"00000000000000000000000000000000":"ffffffffffffffe000000000000000":"":MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH
diff --git a/tests/suites/test_suite_camellia.function b/tests/suites/test_suite_camellia.function
index d09a610..9408348 100644
--- a/tests/suites/test_suite_camellia.function
+++ b/tests/suites/test_suite_camellia.function
@@ -8,6 +8,172 @@
  */
 
 /* BEGIN_CASE */
+void camellia_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_camellia_free( NULL ) );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void camellia_invalid_param( )
+{
+    mbedtls_camellia_context ctx;
+    unsigned char buf[16] = { 0 };
+    const size_t valid_keybits   = 128;
+    const int invalid_mode = 42;
+    const int valid_mode = MBEDTLS_CAMELLIA_ENCRYPT;
+    size_t off;
+    ((void) off);
+
+    TEST_INVALID_PARAM( mbedtls_camellia_init( NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_setkey_enc( NULL,
+                                                         buf,
+                                                         valid_keybits ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_setkey_enc( &ctx,
+                                                         NULL,
+                                                         valid_keybits ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_setkey_dec( NULL,
+                                                         buf,
+                                                         valid_keybits ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_setkey_dec( &ctx,
+                                                         NULL,
+                                                         valid_keybits ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ecb( NULL,
+                                                        valid_mode,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ecb( &ctx,
+                                                        invalid_mode,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ecb( &ctx,
+                                                        valid_mode,
+                                                        NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ecb( &ctx,
+                                                        valid_mode,
+                                                        buf, NULL ) );
+
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cbc( NULL,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        buf, buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cbc( &ctx,
+                                                        invalid_mode,
+                                                        sizeof( buf ),
+                                                        buf, buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cbc( &ctx,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        NULL, buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cbc( &ctx,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        buf, NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cbc( &ctx,
+                                                        valid_mode,
+                                                        sizeof( buf ),
+                                                        buf, buf, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CBC */
+
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cfb128( NULL,
+                                                           valid_mode,
+                                                           sizeof( buf ),
+                                                           &off, buf,
+                                                           buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cfb128( &ctx,
+                                                           invalid_mode,
+                                                           sizeof( buf ),
+                                                           &off, buf,
+                                                           buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cfb128( &ctx,
+                                                           valid_mode,
+                                                           sizeof( buf ),
+                                                           NULL, buf,
+                                                           buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cfb128( &ctx,
+                                                           valid_mode,
+                                                           sizeof( buf ),
+                                                           &off, NULL,
+                                                           buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cfb128( &ctx,
+                                                           valid_mode,
+                                                           sizeof( buf ),
+                                                           &off, buf,
+                                                           NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_cfb128( &ctx,
+                                                           valid_mode,
+                                                           sizeof( buf ),
+                                                           &off, buf,
+                                                           buf, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CFB */
+
+#if defined(MBEDTLS_CIPHER_MODE_CTR)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ctr( NULL,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, buf,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        NULL,
+                                                        buf, buf,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        NULL, buf,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, NULL,
+                                                        buf, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, buf,
+                                                        NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA,
+                            mbedtls_camellia_crypt_ctr( &ctx,
+                                                        sizeof( buf ),
+                                                        &off,
+                                                        buf, buf,
+                                                        buf, NULL ) );
+#endif /* MBEDTLS_CIPHER_MODE_CTR */
+
+exit:
+    return;
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
 void camellia_encrypt_ecb( data_t * key_str, data_t * src_str,
                            data_t * hex_dst_string, int setkey_result )
 {
diff --git a/tests/suites/test_suite_ccm.data b/tests/suites/test_suite_ccm.data
index a2d8778..819b3b7 100644
--- a/tests/suites/test_suite_ccm.data
+++ b/tests/suites/test_suite_ccm.data
@@ -1,6 +1,12 @@
 CCM self test
 mbedtls_ccm_self_test:
 
+CCM - Invalid parameters
+ccm_invalid_param:
+
+CCM - Valid parameters
+ccm_valid_param:
+
 CCM init #1 AES-128: OK
 depends_on:MBEDTLS_AES_C
 mbedtls_ccm_setkey:MBEDTLS_CIPHER_ID_AES:128:0
diff --git a/tests/suites/test_suite_ccm.function b/tests/suites/test_suite_ccm.function
index 9951ca1..16f9f8e 100644
--- a/tests/suites/test_suite_ccm.function
+++ b/tests/suites/test_suite_ccm.function
@@ -326,3 +326,216 @@
     mbedtls_ccm_free( &ctx );
 }
 /* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void ccm_invalid_param( )
+{
+    struct mbedtls_ccm_context ctx;
+    unsigned char valid_buffer[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
+    mbedtls_cipher_id_t valid_cipher = MBEDTLS_CIPHER_ID_AES;
+    int valid_len = sizeof(valid_buffer);
+    int valid_bitlen = valid_len * 8;
+
+    mbedtls_ccm_init( &ctx );
+
+    /* mbedtls_ccm_init() */
+    TEST_INVALID_PARAM( mbedtls_ccm_init( NULL ) );
+
+    /* mbedtls_ccm_setkey() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_setkey( NULL, valid_cipher, valid_buffer, valid_bitlen ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_setkey( &ctx, valid_cipher, NULL, valid_bitlen ) );
+
+    /* mbedtls_ccm_encrypt_and_tag() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_encrypt_and_tag( NULL, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_buffer,
+                                     valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
+                                     NULL, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_buffer,
+                                     valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
+                                     valid_buffer, valid_len,
+                                     NULL, valid_len,
+                                     valid_buffer, valid_buffer,
+                                     valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_len,
+                                     NULL, valid_buffer,
+                                     valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, NULL,
+                                     valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_len,
+                                     valid_buffer, valid_buffer,
+                                     NULL, valid_len ) );
+
+    /* mbedtls_ccm_star_encrypt_and_tag() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_encrypt_and_tag( NULL, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_buffer,
+                                          valid_buffer, valid_len) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
+                                          NULL, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_buffer,
+                                          valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
+                                          valid_buffer, valid_len,
+                                          NULL, valid_len,
+                                          valid_buffer, valid_buffer,
+                                          valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_len,
+                                          NULL, valid_buffer,
+                                          valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, NULL,
+                                          valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_len,
+                                          valid_buffer, valid_buffer,
+                                          NULL, valid_len ) );
+
+    /* mbedtls_ccm_auth_decrypt() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_auth_decrypt( NULL, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_buffer,
+                                  valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_auth_decrypt( &ctx, valid_len,
+                                  NULL, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_buffer,
+                                  valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  NULL, valid_len,
+                                  valid_buffer, valid_buffer,
+                                  valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  NULL, valid_buffer,
+                                  valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, NULL,
+                                  valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_buffer,
+                                  NULL, valid_len ) );
+
+    /* mbedtls_ccm_star_auth_decrypt() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_auth_decrypt( NULL, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_buffer,
+                                       valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
+                                       NULL, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_buffer,
+                                       valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
+                                       valid_buffer, valid_len,
+                                       NULL, valid_len,
+                                       valid_buffer, valid_buffer,
+                                       valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_len,
+                                       NULL, valid_buffer,
+                                       valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, NULL,
+                                       valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_CCM_BAD_INPUT,
+        mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_len,
+                                       valid_buffer, valid_buffer,
+                                       NULL, valid_len ) );
+
+exit:
+    mbedtls_ccm_free( &ctx );
+    return;
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void ccm_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_ccm_free( NULL ) );
+exit:
+    return;
+}
+/* END_CASE */
diff --git a/tests/suites/test_suite_dhm.data b/tests/suites/test_suite_dhm.data
index 734fd97..edebce0 100644
--- a/tests/suites/test_suite_dhm.data
+++ b/tests/suites/test_suite_dhm.data
@@ -1,3 +1,6 @@
+Diffie-Hellman parameter validation
+dhm_invalid_params:
+
 Diffie-Hellman full exchange #1
 dhm_do_dhm:10:"23":10:"5":0
 
diff --git a/tests/suites/test_suite_dhm.function b/tests/suites/test_suite_dhm.function
index 9a4c99c..8a05a38 100644
--- a/tests/suites/test_suite_dhm.function
+++ b/tests/suites/test_suite_dhm.function
@@ -7,6 +7,113 @@
  * END_DEPENDENCIES
  */
 
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void dhm_invalid_params( )
+{
+    mbedtls_dhm_context ctx;
+    unsigned char buf[42] = { 0 };
+    unsigned char *buf_null = NULL;
+    mbedtls_mpi X;
+    size_t const buflen = sizeof( buf );
+    size_t len;
+
+    TEST_INVALID_PARAM( mbedtls_dhm_init( NULL ) );
+    TEST_VALID_PARAM( mbedtls_dhm_free( NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_read_params( NULL,
+                                                     (unsigned char**) &buf,
+                                                     buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_read_params( &ctx, &buf_null, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_read_params( &ctx, NULL, buf ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_read_params( &ctx,
+                                                     (unsigned char**) &buf,
+                                                     NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_params( NULL, buflen,
+                                                     buf, &len,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_params( &ctx, buflen,
+                                                     NULL, &len,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_params( &ctx, buflen,
+                                                     buf, NULL,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_params( &ctx, buflen,
+                                                     buf, &len,
+                                                     NULL,
+                                                     NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_set_group( NULL, &X, &X ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_set_group( &ctx, NULL, &X ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_set_group( &ctx, &X, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_read_public( NULL, buf, buflen ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_read_public( &ctx, NULL, buflen ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_public( NULL, buflen,
+                                                     buf, buflen,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_public( &ctx, buflen,
+                                                     NULL, buflen,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_make_public( &ctx, buflen,
+                                                     buf, buflen,
+                                                     NULL,
+                                                     NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_calc_secret( NULL, buf, buflen,
+                                                     &len, rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_calc_secret( &ctx, NULL, buflen,
+                                                     &len, rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_calc_secret( &ctx, buf, buflen,
+                                                     NULL, rnd_std_rand,
+                                                     NULL ) );
+
+#if defined(MBEDTLS_ASN1_PARSE_C)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_parse_dhm( NULL, buf, buflen ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_parse_dhm( &ctx, NULL, buflen ) );
+
+#if defined(MBEDTLS_FS_IO)
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_parse_dhmfile( NULL, "" ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_DHM_BAD_INPUT_DATA,
+                            mbedtls_dhm_parse_dhmfile( &ctx, NULL ) );
+#endif /* MBEDTLS_FS_IO */
+#endif /* MBEDTLS_ASN1_PARSE_C */
+
+exit:
+    return;
+}
+/* END_CASE */
+
 /* BEGIN_CASE */
 void dhm_do_dhm( int radix_P, char *input_P,
                  int radix_G, char *input_G, int result )
diff --git a/tests/suites/test_suite_ecp.data b/tests/suites/test_suite_ecp.data
index 321a1b4..30d5ec6 100644
--- a/tests/suites/test_suite_ecp.data
+++ b/tests/suites/test_suite_ecp.data
@@ -1,3 +1,9 @@
+ECP valid params
+ecp_valid_param:
+
+ECP invalid params
+ecp_invalid_param:
+
 ECP curve info #1
 depends_on:MBEDTLS_ECP_DP_BP512R1_ENABLED
 mbedtls_ecp_curve_info:MBEDTLS_ECP_DP_BP512R1:28:512:"brainpoolP512r1"
@@ -46,10 +52,6 @@
 depends_on:MBEDTLS_ECP_DP_SECP224K1_ENABLED
 ecp_check_pub:MBEDTLS_ECP_DP_SECP224K1:"E2000000000000BB3A13D43B323337383935321F0603551D":"100101FF040830060101FF02010A30220603551D0E041B04636FC0C0":"101":MBEDTLS_ERR_ECP_INVALID_KEY
 
-ECP write binary #0 (zero, bad format)
-depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
-ecp_write_binary:MBEDTLS_ECP_DP_SECP192R1:"01":"01":"00":ECP_PF_UNKNOWN:"00":1:MBEDTLS_ERR_ECP_BAD_INPUT_DATA
-
 ECP write binary #1 (zero, uncompressed, buffer just fits)
 depends_on:MBEDTLS_ECP_DP_SECP192R1_ENABLED
 ecp_write_binary:MBEDTLS_ECP_DP_SECP192R1:"01":"01":"00":MBEDTLS_ECP_PF_UNCOMPRESSED:"00":1:0
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 65c487e..606ddd2 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -14,6 +14,349 @@
  */
 
 /* BEGIN_CASE */
+void ecp_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_ecp_group_free( NULL ) );
+    TEST_VALID_PARAM( mbedtls_ecp_keypair_free( NULL ) );
+    TEST_VALID_PARAM( mbedtls_ecp_point_free( NULL ) );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    TEST_VALID_PARAM( mbedtls_ecp_restart_free( NULL ) );
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+exit:
+    return;
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void ecp_invalid_param( )
+{
+    mbedtls_ecp_group grp;
+    mbedtls_ecp_keypair kp;
+    mbedtls_ecp_point P;
+    mbedtls_mpi m;
+    const char *x = "deadbeef";
+    int valid_fmt   = MBEDTLS_ECP_PF_UNCOMPRESSED;
+    int invalid_fmt = 42;
+    size_t olen;
+    unsigned char buf[42] = { 0 };
+    const unsigned char *null_buf = NULL;
+    mbedtls_ecp_group_id valid_group = MBEDTLS_ECP_DP_SECP192R1;
+    mbedtls_ecp_restart_ctx restart_ctx;
+
+    TEST_INVALID_PARAM( mbedtls_ecp_point_init( NULL ) );
+    TEST_INVALID_PARAM( mbedtls_ecp_keypair_init( NULL ) );
+    TEST_INVALID_PARAM( mbedtls_ecp_group_init( NULL ) );
+
+#if defined(MBEDTLS_ECP_RESTARTABLE)
+    TEST_INVALID_PARAM( mbedtls_ecp_restart_init( NULL ) );
+    TEST_INVALID_PARAM( mbedtls_ecp_check_budget( NULL, &restart_ctx, 42 ) );
+#endif /* MBEDTLS_ECP_RESTARTABLE */
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_copy( NULL, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_copy( &P, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_group_copy( NULL, &grp ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_group_copy( &grp, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_privkey( NULL,
+                                                     &m,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_privkey( &grp,
+                                                     NULL,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_privkey( &grp,
+                                                     &m,
+                                                     NULL,
+                                                     NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_set_zero( NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_is_zero( NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_cmp( NULL, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_cmp( &P, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_read_string( NULL, 2,
+                                                           x, x ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_read_string( &P, 2,
+                                                           NULL, x ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_read_string( &P, 2,
+                                                           x, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_write_binary( NULL, &P,
+                                                      valid_fmt,
+                                                      &olen,
+                                                      buf, sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_write_binary( &grp, NULL,
+                                                      valid_fmt,
+                                                      &olen,
+                                                      buf, sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_write_binary( &grp, &P,
+                                                      invalid_fmt,
+                                                      &olen,
+                                                      buf, sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_write_binary( &grp, &P,
+                                                      valid_fmt,
+                                                      NULL,
+                                                      buf, sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_write_binary( &grp, &P,
+                                                      valid_fmt,
+                                                      &olen,
+                                                      NULL, sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_read_binary( NULL, &P, buf,
+                                                     sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_read_binary( &grp, NULL, buf,
+                                                     sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_point_read_binary( &grp, &P, NULL,
+                                                     sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_point( NULL, &P,
+                                                 (const unsigned char **) &buf,
+                                                 sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_point( &grp, NULL,
+                                                 (const unsigned char **) &buf,
+                                                 sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_point( &grp, &P, &null_buf,
+                                                        sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_point( &grp, &P, NULL,
+                                                    sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_point( NULL, &P,
+                                                     valid_fmt,
+                                                     &olen,
+                                                     buf,
+                                                     sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_point( &grp, NULL,
+                                                     valid_fmt,
+                                                     &olen,
+                                                     buf,
+                                                     sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_point( &grp, &P,
+                                                     invalid_fmt,
+                                                     &olen,
+                                                     buf,
+                                                     sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_point( &grp, &P,
+                                                     valid_fmt,
+                                                     NULL,
+                                                     buf,
+                                                     sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_point( &grp, &P,
+                                                     valid_fmt,
+                                                     &olen,
+                                                     NULL,
+                                                     sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_group_load( NULL, valid_group ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_group( NULL,
+                                                 (const unsigned char **) &buf,
+                                                 sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_group( &grp, NULL,
+                                                        sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_group( &grp, &null_buf,
+                                                        sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_group_id( NULL,
+                                                 (const unsigned char **) &buf,
+                                                 sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_group_id( &valid_group, NULL,
+                                                        sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_read_group_id( &valid_group,
+                                                           &null_buf,
+                                                           sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_group( NULL, &olen,
+                                                       buf, sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_group( &grp, NULL,
+                                                       buf, sizeof( buf ) ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_tls_write_group( &grp, &olen,
+                                                       NULL, sizeof( buf ) ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul( NULL, &P, &m, &P,
+                                             rnd_std_rand, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul( &grp, NULL, &m, &P,
+                                             rnd_std_rand, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul( &grp, &P, NULL, &P,
+                                             rnd_std_rand, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul( &grp, &P, &m, NULL,
+                                             rnd_std_rand, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul_restartable( NULL, &P, &m, &P,
+                                                 rnd_std_rand, NULL , NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul_restartable( &grp, NULL, &m, &P,
+                                                 rnd_std_rand, NULL , NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul_restartable( &grp, &P, NULL, &P,
+                                                 rnd_std_rand, NULL , NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_mul_restartable( &grp, &P, &m, NULL,
+                                                 rnd_std_rand, NULL , NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd( NULL, &P, &m, &P,
+                                                &m, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd( &grp, NULL, &m, &P,
+                                                &m, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd( &grp, &P, NULL, &P,
+                                                &m, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd( &grp, &P, &m, NULL,
+                                                &m, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd( &grp, &P, &m, &P,
+                                                NULL, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd( &grp, &P, &m, &P,
+                                                &m, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd_restartable( NULL, &P, &m, &P,
+                                                            &m, &P, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd_restartable( &grp, NULL, &m, &P,
+                                                            &m, &P, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd_restartable( &grp, &P, NULL, &P,
+                                                            &m, &P, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd_restartable( &grp, &P, &m, NULL,
+                                                            &m, &P, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd_restartable( &grp, &P, &m, &P,
+                                                            NULL, &P, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_muladd_restartable( &grp, &P, &m, &P,
+                                                            &m, NULL, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_check_pubkey( NULL, &P ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_check_pubkey( &grp, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_check_pub_priv( NULL, &kp ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_check_pub_priv( &kp, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_check_privkey( NULL, &m ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_check_privkey( &grp, NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair_base( NULL, &P,
+                                                          &m, &P,
+                                                          rnd_std_rand,
+                                                          NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair_base( &grp, NULL,
+                                                          &m, &P,
+                                                          rnd_std_rand,
+                                                          NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair_base( &grp, &P,
+                                                          NULL, &P,
+                                                          rnd_std_rand,
+                                                          NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair_base( &grp, &P,
+                                                          &m, NULL,
+                                                          rnd_std_rand,
+                                                          NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair_base( &grp, &P,
+                                                          &m, &P,
+                                                          NULL,
+                                                          NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair( NULL,
+                                                     &m, &P,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair( &grp,
+                                                     NULL, &P,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair( &grp,
+                                                     &m, NULL,
+                                                     rnd_std_rand,
+                                                     NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_keypair( &grp,
+                                                     &m, &P,
+                                                     NULL,
+                                                     NULL ) );
+
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_key( valid_group, NULL,
+                                                 rnd_std_rand, NULL ) );
+    TEST_INVALID_PARAM_RET( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
+                            mbedtls_ecp_gen_key( valid_group, &kp,
+                                                 NULL, NULL ) );
+
+exit:
+    return;
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
 void mbedtls_ecp_curve_info( int id, int tls_id, int size, char * name )
 {
     const mbedtls_ecp_curve_info *by_id, *by_tls, *by_name;
diff --git a/tests/suites/test_suite_gcm.function b/tests/suites/test_suite_gcm.function
index 4d3bba1..1fcb681 100644
--- a/tests/suites/test_suite_gcm.function
+++ b/tests/suites/test_suite_gcm.function
@@ -103,6 +103,175 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
+void gcm_invalid_param( )
+{
+    mbedtls_gcm_context ctx;
+    unsigned char valid_buffer[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
+    mbedtls_cipher_id_t valid_cipher = MBEDTLS_CIPHER_ID_AES;
+    int valid_mode = MBEDTLS_GCM_ENCRYPT;
+    int valid_len = sizeof(valid_buffer);
+    int valid_bitlen = 128, invalid_bitlen = 1;
+
+    mbedtls_gcm_init( &ctx );
+
+    /* mbedtls_gcm_init() */
+    TEST_INVALID_PARAM( mbedtls_gcm_init( NULL ) );
+
+    /* mbedtls_gcm_setkey */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_setkey( NULL, valid_cipher, valid_buffer, valid_bitlen ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_setkey( &ctx, valid_cipher, NULL, valid_bitlen ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_setkey( &ctx, valid_cipher, valid_buffer, invalid_bitlen ) );
+
+    /* mbedtls_gcm_crypt_and_tag() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_crypt_and_tag( NULL, valid_mode, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_buffer,
+                                   valid_len, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_crypt_and_tag( &ctx, valid_mode, valid_len,
+                                   NULL, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_buffer,
+                                   valid_len, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_crypt_and_tag( &ctx, valid_mode, valid_len,
+                                   valid_buffer, valid_len,
+                                   NULL, valid_len,
+                                   valid_buffer, valid_buffer,
+                                   valid_len, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_crypt_and_tag( &ctx, valid_mode, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_len,
+                                   NULL, valid_buffer,
+                                   valid_len, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_crypt_and_tag( &ctx, valid_mode, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, NULL,
+                                   valid_len, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_crypt_and_tag( &ctx, valid_mode, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_len,
+                                   valid_buffer, valid_buffer,
+                                   valid_len, NULL ) );
+
+    /* mbedtls_gcm_auth_decrypt() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_auth_decrypt( NULL, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_buffer) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_auth_decrypt( &ctx, valid_len,
+                                  NULL, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_buffer) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  NULL, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_buffer) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  NULL, valid_len,
+                                  valid_buffer, valid_buffer) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  NULL, valid_buffer) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_auth_decrypt( &ctx, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, valid_len,
+                                  valid_buffer, NULL) );
+
+    /* mbedtls_gcm_starts() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_starts( NULL, valid_mode,
+                            valid_buffer, valid_len,
+                            valid_buffer, valid_len ) );
+
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_starts( &ctx, valid_mode,
+                            NULL, valid_len,
+                            valid_buffer, valid_len ) );
+
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_starts( &ctx, valid_mode,
+                            valid_buffer, valid_len,
+                            NULL, valid_len ) );
+
+    /* mbedtls_gcm_update() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_update( NULL, valid_len,
+                            valid_buffer, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_update( &ctx, valid_len,
+                            NULL, valid_buffer ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_update( &ctx, valid_len,
+                            valid_buffer, NULL ) );
+
+    /* mbedtls_gcm_finish() */
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_finish( NULL, valid_buffer, valid_len ) );
+    TEST_INVALID_PARAM_RET(
+        MBEDTLS_ERR_GCM_BAD_INPUT,
+        mbedtls_gcm_finish( &ctx, NULL, valid_len ) );
+
+exit:
+    mbedtls_gcm_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void gcm_valid_param( )
+{
+    TEST_VALID_PARAM( mbedtls_gcm_free( NULL ) );
+exit:
+    return;
+}
+/* END_CASE */
+
 /* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
 void gcm_selftest(  )
 {
diff --git a/tests/suites/test_suite_gcm.misc.data b/tests/suites/test_suite_gcm.misc.data
new file mode 100644
index 0000000..cf01526
--- /dev/null
+++ b/tests/suites/test_suite_gcm.misc.data
@@ -0,0 +1,5 @@
+GCM - Invalid parameters
+gcm_invalid_param:
+
+GCM - Valid parameters
+gcm_valid_param: