diff --git a/ChangeLog b/ChangeLog
index 25f3b32..0133548 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,11 @@
 
 = mbed TLS x.x.x branch released xxxx-xx-xx
 
+Features
+   * Add new crypto primitives from RFC 7539: stream cipher Chacha20, one-time
+   authenticator Poly1305 and AEAD construct Chacha20-Poly1305. Contributed by
+   Daniel King (#485).
+
 API Changes
    * Extend the platform module with a util component that contains
      functionality shared by multiple Mbed TLS modules. At this stage
diff --git a/include/mbedtls/chacha20.h b/include/mbedtls/chacha20.h
new file mode 100644
index 0000000..7a8cd53
--- /dev/null
+++ b/include/mbedtls/chacha20.h
@@ -0,0 +1,210 @@
+/**
+ * \file chacha20.h
+ *
+ * \brief   This file contains ChaCha20 definitions and functions.
+ *
+ *          ChaCha20 is a stream cipher that can encrypt and decrypt
+ *          information. ChaCha was created by Daniel Bernstein as a variant of
+ *          its Salsa cipher https://cr.yp.to/chacha/chacha-20080128.pdf
+ *          ChaCha20 is the variant with 20 rounds, that was also standardized
+ *          in RFC 7539.
+ *
+ * \author Daniel King <damaki.gh@gmail.com>
+ */
+
+/*  Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved.
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of Mbed TLS (https://tls.mbed.org)
+ */
+
+#ifndef MBEDTLS_CHACHA20_H
+#define MBEDTLS_CHACHA20_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA         -0x0053 /**< Invalid input parameter(s). */
+#define MBEDTLS_ERR_CHACHA20_FEATURE_UNAVAILABLE    -0x0055 /**< Feature not available. For example, s part of the API is not implemented. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDTLS_CHACHA20_ALT)
+
+typedef struct
+{
+    uint32_t initial_state[16];  /*! The initial state (before round operations). */
+    uint32_t working_state[16];  /*! The working state (after round operations). */
+    uint8_t  keystream8[64];     /*! Leftover keystream bytes. */
+    size_t keystream_bytes_used; /*! Number of keystream bytes already used. */
+}
+mbedtls_chacha20_context;
+
+#else  /* MBEDTLS_CHACHA20_ALT */
+#include "chacha20_alt.h"
+#endif /* MBEDTLS_CHACHA20_ALT */
+
+/**
+ * \brief           This function initializes the specified ChaCha20 context.
+ *
+ *                  It must be the first API called before using
+ *                  the context.
+ *
+ *                  It is usually followed by calls to
+ *                  \c mbedtls_chacha20_setkey() and
+ *                  \c mbedtls_chacha20_starts(), then one or more calls to
+ *                  to \c mbedtls_chacha20_update(), and finally to
+ *                  \c mbedtls_chacha20_free().
+ *
+ * \param ctx       The ChaCha20 context to initialize.
+ */
+void mbedtls_chacha20_init( mbedtls_chacha20_context *ctx );
+
+/**
+ * \brief           This function releases and clears the specified ChaCha20 context.
+ *
+ * \param ctx       The ChaCha20 context to clear.
+ */
+void mbedtls_chacha20_free( mbedtls_chacha20_context *ctx );
+
+/**
+ * \brief           This function sets the encryption/decryption key.
+ *
+ * \note            After using this function, you must also call
+ *                  \c mbedtls_chacha20_starts() to set a nonce before you
+ *                  start encrypting/decrypting data with
+ *                  \c mbedtls_chacha_update().
+ *
+ * \param ctx       The ChaCha20 context to which the key should be bound.
+ * \param key       The encryption/decryption key. Must be 32 bytes in length.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or key is NULL.
+ */
+int mbedtls_chacha20_setkey( mbedtls_chacha20_context *ctx,
+                             const unsigned char key[32] );
+
+/**
+ * \brief           This function sets the nonce and initial counter value.
+ *
+ * \note            A ChaCha20 context can be re-used with the same key by
+ *                  calling this function to change the nonce.
+ *
+ * \warning         You must never use the same nonce twice with the same key.
+ *                  This would void any confidentiality guarantees for the
+ *                  messages encrypted with the same nonce and key.
+ *
+ * \param ctx       The ChaCha20 context to which the nonce should be bound.
+ * \param nonce     The nonce. Must be 12 bytes in size.
+ * \param counter   The initial counter value. This is usually 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if ctx or nonce is
+ *                  NULL.
+ */
+int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
+                             const unsigned char nonce[12],
+                             uint32_t counter );
+
+/**
+ * \brief           This function encrypts or decrypts data.
+ *
+ *                  Since ChaCha20 is a stream cipher, the same operation is
+ *                  used for encrypting and decrypting data.
+ *
+ * \note            The \p input and \p output pointers must either be equal or
+ *                  point to non-overlapping buffers.
+ *
+ * \note            \c mbedtls_chacha20_setkey() and
+ *                  \c mbedtls_chacha20_starts() must be called at least once
+ *                  to setup the context before this function can be called.
+ *
+ * \note            This function can be called mutliple times in a row in
+ *                  order to encrypt of decrypt data piecewise with the same
+ *                  key and nonce.
+ *
+ * \param ctx       The ChaCha20 context to use for encryption or decryption.
+ * \param size      The length of the input data in bytes.
+ * \param input     The buffer holding the input data.
+ *                  This pointer can be NULL if size == 0.
+ * \param output    The buffer holding the output data.
+ *                  Must be able to hold \p size bytes.
+ *                  This pointer can be NULL if size == 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if the ctx, input, or
+ *                  output pointers are NULL.
+ */
+int mbedtls_chacha20_update( mbedtls_chacha20_context *ctx,
+                             size_t size,
+                             const unsigned char *input,
+                             unsigned char *output );
+
+/**
+ * \brief           This function encrypts or decrypts data with ChaCha20 and
+ *                  the given key and nonce.
+ *
+ *                  Since ChaCha20 is a stream cipher, the same operation is
+ *                  used for encrypting and decrypting data.
+ *
+ * \warning         You must never use the same (key, nonce) pair more than
+ *                  once. This would void any confidentiality guarantees for
+ *                  the messages encrypted with the same nonce and key.
+ *
+ * \note            The \p input and \p output pointers must either be equal or
+ *                  point to non-overlapping buffers.
+ *
+ * \param key       The encryption/decryption key. Must be 32 bytes in length.
+ * \param nonce     The nonce. Must be 12 bytes in size.
+ * \param counter   The initial counter value. This is usually 0.
+ * \param size      The length of the input data in bytes.
+ * \param input     The buffer holding the input data.
+ *                  This pointer can be NULL if size == 0.
+ * \param output    The buffer holding the output data.
+ *                  Must be able to hold \p size bytes.
+ *                  This pointer can be NULL if size == 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA if key, nonce, input,
+ *                  or output is NULL.
+ */
+int mbedtls_chacha20_crypt( const unsigned char key[32],
+                            const unsigned char nonce[12],
+                            uint32_t counter,
+                            size_t size,
+                            const unsigned char* input,
+                            unsigned char* output );
+
+/**
+ * \brief           The ChaCha20 checkup routine.
+ *
+ * \return          \c 0 on success.
+ * \return          \c 1 on failure.
+ */
+int mbedtls_chacha20_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MBEDTLS_CHACHA20_H */
diff --git a/include/mbedtls/chachapoly.h b/include/mbedtls/chachapoly.h
new file mode 100644
index 0000000..a55a3ee
--- /dev/null
+++ b/include/mbedtls/chachapoly.h
@@ -0,0 +1,327 @@
+/**
+ * \file chachapoly.h
+ *
+ * \brief   This file contains the AEAD-ChaCha20-Poly1305 definitions and
+ *          functions.
+ *
+ *          ChaCha20-Poly1305 is an algorithm for Authenticated Encryption
+ *          with Associated Data (AEAD) that can be used to encrypt and
+ *          authenticate data. It is based on ChaCha20 and Poly1305 by Daniel
+ *          Bernstein and was standardized in RFC 7539.
+ *
+ * \author Daniel King <damaki.gh@gmail.com>
+ */
+
+/*  Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved.
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of Mbed TLS (https://tls.mbed.org)
+ */
+
+#ifndef MBEDTLS_CHACHAPOLY_H
+#define MBEDTLS_CHACHAPOLY_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#define MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA       -0x0054 /**< Invalid input parameter(s). */
+#define MBEDTLS_ERR_CHACHAPOLY_BAD_STATE            -0x0056 /**< The requested operation is not permitted in the current state. */
+#define MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED          -0x0058 /**< Authenticated decryption failed: data was not authentic. */
+#define MBEDTLS_ERR_CHACHAPOLY_FEATURE_UNAVAILABLE  -0x005A /**< Feature not available. For example, s part of the API is not implemented. */
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum
+{
+    MBEDTLS_CHACHAPOLY_ENCRYPT,     /**< The mode value for performing encryption. */
+    MBEDTLS_CHACHAPOLY_DECRYPT      /**< The mode value for performing decryption. */
+}
+mbedtls_chachapoly_mode_t;
+
+#if !defined(MBEDTLS_CHACHAPOLY_ALT)
+
+#include "chacha20.h"
+#include "poly1305.h"
+
+typedef struct
+{
+    mbedtls_chacha20_context chacha20_ctx;  /**< The ChaCha20 context. */
+    mbedtls_poly1305_context poly1305_ctx;  /**< The Poly1305 context. */
+    uint64_t aad_len;                       /**< The length (bytes) of the Additional Authenticated Data. */
+    uint64_t ciphertext_len;                /**< The length (bytes) of the ciphertext. */
+    int state;                              /**< The current state of the context. */
+    mbedtls_chachapoly_mode_t mode;         /**< Cipher mode (encrypt or decrypt). */
+}
+mbedtls_chachapoly_context;
+
+#else /* !MBEDTLS_CHACHAPOLY_ALT */
+#include "chachapoly_alt.h"
+#endif /* !MBEDTLS_CHACHAPOLY_ALT */
+
+/**
+ * \brief           This function initializes the specified ChaCha20-Poly1305 context.
+ *
+ *                  It must be the first API called before using
+ *                  the context. It must be followed by a call to
+ *                  \c mbedtls_chachapoly_setkey() before any operation can be
+ *                  done, and to \c mbedtls_chachapoly_free() once all
+ *                  operations with that context have been finished.
+ *
+ *                  In order to encrypt or decrypt full messages at once, for
+ *                  each message you should make a single call to
+ *                  \c mbedtls_chachapoly_crypt_and_tag() or
+ *                  \c mbedtls_chachapoly_auth_decrypt().
+ *
+ *                  In order to encrypt or decrypt messages piecewise, for each
+ *                  message you should make a call to
+ *                  \c mbedtls_chachapoly_starts(), then 0 or more calls to
+ *                  \c mbedtls_chachapoly_update_aad(), then 0 or more calls to
+ *                  \c mbedtls_chachapoly_update(), then one call to
+ *                  \c mbedtls_chachapoly_finish().
+ *
+ *
+ * \param ctx       The ChachaPoly context to initialize.
+ */
+void mbedtls_chachapoly_init( mbedtls_chachapoly_context *ctx );
+
+/**
+ * \brief           This function releases and clears the specified ChaCha20-Poly1305 context.
+ *
+ * \param ctx       The ChachaPoly context to clear.
+ */
+void mbedtls_chachapoly_free( mbedtls_chachapoly_context *ctx );
+
+/**
+ * \brief           This function sets the ChaCha20-Poly1305 symmetric encryption key.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context to which the key should be
+ *                  bound.
+ * \param key       The 256-bit (32 bytes) key.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if \p ctx or \p key are NULL.
+ */
+int mbedtls_chachapoly_setkey( mbedtls_chachapoly_context *ctx,
+                               const unsigned char key[32] );
+
+/**
+ * \brief           This function starts a ChaCha20-Poly1305 encryption or
+ *                  decryption operation.
+ *
+ * \warning         You must never use the same nonce twice with the same key.
+ *                  This would void any confidentiality and authenticity
+ *                  guarantees for the messages encrypted with the same nonce
+ *                  and key.
+ *
+ * \note            If the context is being used for AAD only (no data to
+ *                  encrypt or decrypt) then \p mode can be set to any value.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context.
+ * \param nonce     The nonce/IV to use for the message. Must be 12 bytes.
+ * \param mode      The operation to perform: #MBEDTLS_CHACHAPOLY_ENCRYPT or
+ *                  #MBEDTLS_CHACHAPOLY_DECRYPT.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if \p ctx or \p mac are NULL.
+ */
+int mbedtls_chachapoly_starts( mbedtls_chachapoly_context *ctx,
+                               const unsigned char nonce[12],
+                               mbedtls_chachapoly_mode_t mode );
+
+/**
+ * \brief           This function feeds additional data to be authenticated
+ *                  into an ongoing ChaCha20-Poly1305 operation.
+ *
+ *                  The Additional Authenticated Data (AAD), also called
+ *                  Associated Data (AD) is only authenticated but not
+ *                  encrypted nor included in the encrypted output. It is
+ *                  usually transmitted separately fro mthe ciphertext or
+ *                  computed locally by each party.
+ *
+ * \note            This function is called before data is encrypted/decrypted.
+ *                  I.e. call this function to process the AAD before calling
+ *                  \c mbedtls_chachapoly_update().
+ *
+ *                  You may call this function multiple times to process
+ *                  an arbitrary amount of AAD. It is permitted to call
+ *                  this function 0 times, if no AAD is used.
+ *
+ *                  This function cannot be called any more if data has
+ *                  been processed by \c mbedtls_chachapoly_update(),
+ *                  or if the context has been finished.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context to use.
+ * \param aad_len   The length (in bytes) of the AAD. The length has no
+ *                  restrictions.
+ * \param aad       Buffer containing the AAD.
+ *                  This pointer can be NULL if aad_len == 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if \p ctx or \p aad are NULL.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_STATE
+ *                  if the operations has not been started or has been
+ *                  finished, or if the AAD has been finished.
+ */
+int mbedtls_chachapoly_update_aad( mbedtls_chachapoly_context *ctx,
+                                   const unsigned char *aad,
+                                   size_t aad_len );
+
+/**
+ * \brief           Thus function feeds data to be encrypted or decrypted
+ *                  into an on-going ChaCha20-Poly1305
+ *                  operation.
+ *
+ *                  The direction (encryption or decryption) depends on the
+ *                  mode that was given when calling
+ *                  \c mbedtls_chachapoly_starts().
+ *
+ *                  You may call this function multiple times to process
+ *                  an arbitrary amount of data. It is permitted to call
+ *                  this function 0 times, if no data is to be encrypted
+ *                  or decrypted.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context to use.
+ * \param len       The length (in bytes) of the data to encrypt or decrypt.
+ * \param input     The buffer containing the data to encrypt or decrypt.
+ *                  This pointer can be NULL if len == 0.
+ * \param output    The buffer to where the encrypted or decrypted data is written.
+ *                  Must be able to hold \p len bytes.
+ *                  This pointer can be NULL if len == 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if \p ctx, \p input, or \p output are NULL.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_STATE
+ *                  if the operation has not been started or has been
+ *                  finished.
+ */
+int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
+                               size_t len,
+                               const unsigned char *input,
+                               unsigned char *output );
+
+/**
+ * \brief           This function finished the ChaCha20-Poly1305 operation and
+ *                  generates the MAC (authentication tag).
+ *
+ * \param ctx       The ChaCha20-Poly1305 context to use.
+ * \param mac       The buffer to where the 128-bit (16 bytes) MAC is written.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if \p ctx or \p mac are NULL.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_STATE
+ *                  if the operation has not been started or has been
+ *                  finished.
+ */
+int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
+                               unsigned char mac[16] );
+
+/**
+ * \brief           This function performs a complete ChaCha20-Poly1305
+ *                  operation with the previously-set key.
+ *
+ * \note            Before using this function, you must set the key with
+ *                  \c mbedtls_chachapoly_setkey().
+ *
+ * \warning         You must never use the same nonce twice with the same key.
+ *                  This would void any confidentiality and authenticity
+ *                  guarantees for the messages encrypted with the same nonce
+ *                  and key.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context to use (holds the key).
+ * \param mode      The operation to perform: #MBEDTLS_CHACHAPOLY_ENCRYPT or
+ *                  #MBEDTLS_CHACHAPOLY_DECRYPT.
+ * \param length    The length (in bytes) of the data to encrypt or decrypt.
+ * \param nonce     The 96-bit (12 bytes) nonce/IV to use.
+ * \param aad       The buffer containing the additional authenticated data (AAD).
+ *                  This pointer can be NULL if aad_len == 0.
+ * \param aad_len   The length (in bytes) of the AAD data to process.
+ * \param input     The buffer containing the data to encrypt or decrypt.
+ *                  This pointer can be NULL if ilen == 0.
+ * \param output    The buffer to where the encrypted or decrypted data is written.
+ *                  This pointer can be NULL if ilen == 0.
+ * \param tag       The buffer to where the computed 128-bit (16 bytes) MAC is written.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if one or more of the required parameters are NULL.
+ */
+int mbedtls_chachapoly_crypt_and_tag( mbedtls_chachapoly_context *ctx,
+                                      mbedtls_chachapoly_mode_t mode,
+                                      size_t length,
+                                      const unsigned char nonce[12],
+                                      const unsigned char *aad,
+                                      size_t aad_len,
+                                      const unsigned char *input,
+                                      unsigned char *output,
+                                      unsigned char tag[16] );
+
+/**
+ * \brief           This function performs a complete ChaCha20-Poly1305
+ *                  authenticated decryption with the previously-set key.
+ *
+ * \note            Before using this function, you must set the key with
+ *                  \c mbedtls_chachapoly_setkey().
+ *
+ * \param ctx       The ChaCha20-Poly1305 context to use (holds the key).
+ * \param length    The length (in bytes) of the data to decrypt.
+ * \param nonce     The 96-bit (12 bytes) nonce/IV to use.
+ * \param aad       The buffer containing the additional authenticated data (AAD).
+ *                  This pointer can be NULL if aad_len == 0.
+ * \param aad_len   The length (in bytes) of the AAD data to process.
+ * \param tag       The buffer holding the authentication tag.
+ * \param input     The buffer containing the data to decrypt.
+ *                  This pointer can be NULL if ilen == 0.
+ * \param output    The buffer to where the decrypted data is written.
+ *                  This pointer can be NULL if ilen == 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA
+ *                  if one or more of the required parameters are NULL.
+ * \return          #MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED
+ *                  if the data was not authentic.
+ */
+int mbedtls_chachapoly_auth_decrypt( mbedtls_chachapoly_context *ctx,
+                                     size_t length,
+                                     const unsigned char nonce[12],
+                                     const unsigned char *aad,
+                                     size_t aad_len,
+                                     const unsigned char tag[16],
+                                     const unsigned char *input,
+                                     unsigned char *output );
+
+/**
+ * \brief           The ChaCha20-Poly1305 checkup routine.
+ *
+ * \return          \c 0 on success.
+ * \return          \c 1 on failure.
+ */
+int mbedtls_chachapoly_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MBEDTLS_CHACHAPOLY_H */
diff --git a/include/mbedtls/cipher.h b/include/mbedtls/cipher.h
index f588b14..1961b4f 100644
--- a/include/mbedtls/cipher.h
+++ b/include/mbedtls/cipher.h
@@ -37,7 +37,7 @@
 
 #include <stddef.h>
 
-#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
 #define MBEDTLS_CIPHER_MODE_AEAD
 #endif
 
@@ -86,6 +86,7 @@
     MBEDTLS_CIPHER_ID_CAMELLIA,  /**< The Camellia cipher. */
     MBEDTLS_CIPHER_ID_BLOWFISH,  /**< The Blowfish cipher. */
     MBEDTLS_CIPHER_ID_ARC4,      /**< The RC4 cipher. */
+    MBEDTLS_CIPHER_ID_CHACHA20,  /**< The ChaCha20 cipher. */
 } mbedtls_cipher_id_t;
 
 /**
@@ -150,6 +151,8 @@
     MBEDTLS_CIPHER_AES_256_OFB,          /**< AES 256-bit cipher in OFB mode. */
     MBEDTLS_CIPHER_AES_128_XTS,          /**< AES 128-bit cipher in XTS block mode. */
     MBEDTLS_CIPHER_AES_256_XTS,          /**< AES 256-bit cipher in XTS block mode. */
+    MBEDTLS_CIPHER_CHACHA20,             /**< ChaCha20 stream cipher. */
+    MBEDTLS_CIPHER_CHACHA20_POLY1305,    /**< ChaCha20-Poly1305 AEAD cipher. */
 } mbedtls_cipher_type_t;
 
 /** Supported cipher modes. */
@@ -567,11 +570,11 @@
  */
 int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
 /**
  * \brief               This function adds additional data for AEAD ciphers.
- *                      Only supported with GCM. Must be called
- *                      exactly once, after mbedtls_cipher_reset().
+ *                      Currently supported with GCM and ChaCha20+Poly1305.
+ *                      Must be called exactly once, after mbedtls_cipher_reset().
  *
  * \param ctx           The generic cipher context.
  * \param ad            The additional data to use.
@@ -582,7 +585,7 @@
  */
 int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
                       const unsigned char *ad, size_t ad_len );
-#endif /* MBEDTLS_GCM_C */
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
 
 /**
  * \brief               The generic cipher update function. It encrypts or
@@ -640,10 +643,10 @@
 int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
                    unsigned char *output, size_t *olen );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
 /**
  * \brief               This function writes a tag for AEAD ciphers.
- *                      Only supported with GCM.
+ *                      Currently supported with GCM and ChaCha20+Poly1305.
  *                      Must be called after mbedtls_cipher_finish().
  *
  * \param ctx           The generic cipher context.
@@ -658,7 +661,7 @@
 
 /**
  * \brief               This function checks the tag for AEAD ciphers.
- *                      Only supported with GCM.
+ *                      Currently supported with GCM and ChaCha20+Poly1305.
  *                      Must be called after mbedtls_cipher_finish().
  *
  * \param ctx           The generic cipher context.
@@ -670,7 +673,7 @@
  */
 int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
                       const unsigned char *tag, size_t tag_len );
-#endif /* MBEDTLS_GCM_C */
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
 
 /**
  * \brief               The generic all-in-one encryption/decryption function,
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 337e136..8baf439 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -269,11 +269,13 @@
  *            digests and ciphers instead.
  *
  */
+//#define MBEDTLS_CHACHAPOLY_ALT
 //#define MBEDTLS_AES_ALT
 //#define MBEDTLS_ARC4_ALT
 //#define MBEDTLS_BLOWFISH_ALT
 //#define MBEDTLS_CAMELLIA_ALT
 //#define MBEDTLS_CCM_ALT
+//#define MBEDTLS_CHACHA20_ALT
 //#define MBEDTLS_CMAC_ALT
 //#define MBEDTLS_DES_ALT
 //#define MBEDTLS_DHM_ALT
@@ -282,6 +284,7 @@
 //#define MBEDTLS_MD2_ALT
 //#define MBEDTLS_MD4_ALT
 //#define MBEDTLS_MD5_ALT
+//#define MBEDTLS_POLY1305_ALT
 //#define MBEDTLS_RIPEMD160_ALT
 //#define MBEDTLS_RSA_ALT
 //#define MBEDTLS_SHA1_ALT
@@ -1702,6 +1705,17 @@
 #define MBEDTLS_AES_C
 
 /**
+ * \def MBEDTLS_CHACHAPOLY_C
+ *
+ * Enable the ChaCha20-Poly1305 AEAD algorithm.
+ *
+ * Module:  library/chachapoly.c
+ *
+ * This module requires: MBEDTLS_CHACHA20_C, MBEDTLS_POLY1305_C
+ */
+#define MBEDTLS_CHACHAPOLY_C
+
+/**
  * \def MBEDTLS_ARC4_C
  *
  * Enable the ARCFOUR stream cipher.
@@ -1851,6 +1865,16 @@
 #define MBEDTLS_CAMELLIA_C
 
 /**
+ * \def MBEDTLS_CHACHA20_C
+ *
+ * Enable the ChaCha20 block cipher.
+ *
+ * Module:  library/chacha20.c
+ * Caller:  library/chachapoly.c
+ */
+#define MBEDTLS_CHACHA20_C
+
+/**
  * \def MBEDTLS_CCM_C
  *
  * Enable the Counter with CBC-MAC (CCM) mode for 128-bit block cipher.
@@ -1877,6 +1901,15 @@
 #define MBEDTLS_CERTS_C
 
 /**
+ * \def MBEDTLS_CHACHA20_C
+ *
+ * Enable the ChaCha20 stream cipher.
+ *
+ * Module:  library/chacha20.c
+ */
+#define MBEDTLS_CHACHA20_C
+
+/**
  * \def MBEDTLS_CIPHER_C
  *
  * Enable the generic cipher layer.
@@ -2419,6 +2452,16 @@
 #define MBEDTLS_PLATFORM_C
 
 /**
+ * \def MBEDTLS_POLY1305_C
+ *
+ * Enable the Poly1305 MAC algorithm.
+ *
+ * Module:  library/poly1305.c
+ * Caller:  library/chachapoly.c
+ */
+#define MBEDTLS_POLY1305_C
+
+/**
  * \def MBEDTLS_RIPEMD160_C
  *
  * Enable the RIPEMD-160 hash algorithm.
diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index a3d6bba..5290721 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -76,6 +76,9 @@
  * SHA1      1                  0x0035-0x0035
  * SHA256    1                  0x0037-0x0037
  * SHA512    1                  0x0039-0x0039
+ * CHACHA20  2                  0x0053-0x0055
+ * POLY1305  2                  0x0057-0x0059
+ * CHACHAPOLY 4 0x0054-0x005A
  *
  * High-level module nr (3 bits - 0x0...-0x7...)
  * Name      ID  Nr of Errors
diff --git a/include/mbedtls/poly1305.h b/include/mbedtls/poly1305.h
new file mode 100644
index 0000000..021a3a0
--- /dev/null
+++ b/include/mbedtls/poly1305.h
@@ -0,0 +1,178 @@
+/**
+ * \file poly1305.h
+ *
+ * \brief   This file containts Poly1305 definitions and functions.
+ *
+ *          Poly1305 is a one-time message authenticator that can be used to
+ *          authenticate messages. Poly1305-AES was created by Daniel
+ *          Bernstein https://cr.yp.to/mac/poly1305-20050329.pdf The generic
+ *          Poly1305 algorithm (not tied to AES) was also standardized in RFC
+ *          7539.
+ *
+ * \author Daniel King <damaki.gh@gmail.com>
+ */
+
+/*  Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved.
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of Mbed TLS (https://tls.mbed.org)
+ */
+
+#ifndef MBEDTLS_POLY1305_H
+#define MBEDTLS_POLY1305_H
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA         -0x0057 /**< Invalid input parameter(s). */
+#define MBEDTLS_ERR_POLY1305_FEATURE_UNAVAILABLE    -0x0059 /**< Feature not available. For example, s part of the API is not implemented. */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDTLS_POLY1305_ALT)
+
+typedef struct
+{
+    uint32_t r[4];      /** The value for 'r' (low 128 bits of the key). */
+    uint32_t s[4];      /** The value for 's' (high 128 bits of the key). */
+    uint32_t acc[5];    /** The accumulator number. */
+    uint8_t queue[16];  /** The current partial block of data. */
+    size_t queue_len;   /** The number of bytes stored in 'queue'. */
+}
+mbedtls_poly1305_context;
+
+#else  /* MBEDTLS_POLY1305_ALT */
+#include "poly1305_alt.h"
+#endif /* MBEDTLS_POLY1305_ALT */
+
+/**
+ * \brief           This function initializes the specified Poly1305 context.
+ *
+ *                  It must be the first API called before using
+ *                  the context.
+ *
+ *                  It is usually followed by a call to
+ *                  \c mbedtls_poly1305_starts(), then one or more calls to
+ *                  \c mbedtls_poly1305_update(), then one call to
+ *                  \c mbedtls_poly1305_finish(), then finally
+ *                  \c mbedtls_poly1305_free().
+ *
+ * \param ctx       The Poly1305 context to initialize.
+ */
+void mbedtls_poly1305_init( mbedtls_poly1305_context *ctx );
+
+/**
+ * \brief           This function releases and clears the specified Poly1305 context.
+ *
+ * \param ctx       The Poly1305 context to clear.
+ */
+void mbedtls_poly1305_free( mbedtls_poly1305_context *ctx );
+
+/**
+ * \brief           This function sets the one-time authentication key.
+ *
+ * \warning         The key must be unique and unpredictable for each
+ *                  invocation of Poly1305.
+ *
+ * \param ctx       The Poly1305 context to which the key should be bound.
+ * \param key       The buffer containing the 256-bit key.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA
+ *                  if ctx or key are NULL.
+ */
+int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
+                             const unsigned char key[32] );
+
+/**
+ * \brief           This functions feeds an input bufer into an ongoing
+ *                  Poly1305 computation.
+ *
+ *                  It is called between \c mbedtls_cipher_cmac_starts() and
+ *                  \c mbedtls_cipher_cmac_finish().
+ *                  Can be called repeatedly to process a stream of data.
+ *
+ * \param ctx       The Poly1305 context to use for the Poly1305 operation.
+ * \param ilen      The length of the input data (in bytes). Any value is accepted.
+ * \param input     The buffer holding the input data.
+ *                  This pointer can be NULL if ilen == 0.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA
+ *                  if ctx or input are NULL.
+ */
+int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
+                             const unsigned char *input,
+                             size_t ilen );
+
+/**
+ * \brief           This function generates the Poly1305 Message
+ *                  Authentication Code (MAC).
+ *
+ * \param ctx       The Poly1305 context to use for the Poly1305 operation.
+ * \param mac       The buffer to where the MAC is written. Must be big enough
+ *                  to hold the 16-byte MAC.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA
+ *                  if ctx or mac are NULL.
+ */
+int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
+                             unsigned char mac[16] );
+
+/**
+ * \brief           This function calculates the Poly1305 MAC of the input
+ *                  buffer with the provided key.
+ *
+ * \warning         The key must be unique and unpredictable for each
+ *                  invocation of Poly1305.
+ *
+ * \param key       The buffer containing the 256-bit key.
+ * \param ilen      The length of the input data (in bytes). Any value is accepted.
+ * \param input     The buffer holding the input data.
+ *                  This pointer can be NULL if ilen == 0.
+ * \param mac       The buffer to where the MAC is written. Must be big enough
+ *                  to hold the 16-byte MAC.
+ *
+ * \return          \c 0 on success.
+ * \return          #MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA
+ *                  if key, input, or mac are NULL.
+ */
+int mbedtls_poly1305_mac( const unsigned char key[32],
+                          const unsigned char *input,
+                          size_t ilen,
+                          unsigned char mac[16] );
+
+/**
+ * \brief           The Poly1305 checkup routine.
+ *
+ * \return          \c 0 on success.
+ * \return          \c 1 on failure.
+ */
+int mbedtls_poly1305_self_test( int verbose );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MBEDTLS_POLY1305_H */
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index b730d08..4ac9854 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -13,6 +13,8 @@
     blowfish.c
     camellia.c
     ccm.c
+    chacha20.c
+    chachapoly.c
     cipher.c
     cipher_wrap.c
     cmac.c
@@ -48,6 +50,7 @@
     pkwrite.c
     platform.c
     platform_util.c
+    poly1305.c
     ripemd160.c
     rsa.c
     rsa_internal.c
diff --git a/library/Makefile b/library/Makefile
index 5721d7e..c8782ca 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -50,7 +50,8 @@
 OBJS_CRYPTO=	aes.o		aesni.o		arc4.o		\
 		asn1parse.o	asn1write.o	base64.o	\
 		bignum.o	blowfish.o	camellia.o	\
-		ccm.o		cipher.o	cipher_wrap.o	\
+		ccm.o		chacha20.o	chachapoly.o	\
+		cipher.o	cipher_wrap.o			\
 		cmac.o		ctr_drbg.o	des.o		\
 		dhm.o		ecdh.o		ecdsa.o		\
 		ecjpake.o	ecp.o				\
@@ -63,11 +64,11 @@
 		padlock.o	pem.o		pk.o		\
 		pk_wrap.o	pkcs12.o	pkcs5.o		\
 		pkparse.o	pkwrite.o	platform.o	\
-		platform_util.o	ripemd160.o	rsa_internal.o	\
-		rsa.o 		sha1.o		sha256.o	\
-		sha512.o	threading.o	timing.o	\
-		version.o	version_features.o		\
-		xtea.o
+		platform_util.o	poly1305.o			\
+		ripemd160.o	rsa_internal.o	rsa.o  		\
+		sha1.o		sha256.o	sha512.o	\
+		threading.o	timing.o	version.o	\
+		version_features.o		xtea.o
 
 OBJS_X509=	certs.o		pkcs11.o	x509.o		\
 		x509_create.o	x509_crl.o	x509_crt.o	\
diff --git a/library/chacha20.c b/library/chacha20.c
new file mode 100644
index 0000000..5a753eb
--- /dev/null
+++ b/library/chacha20.c
@@ -0,0 +1,570 @@
+/**
+ * \file chacha20.c
+ *
+ * \brief ChaCha20 cipher.
+ *
+ * \author Daniel King <damaki.gh@gmail.com>
+ *
+ *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#include "mbedtls/chacha20.h"
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_CHACHA20_C)
+
+#if !defined(MBEDTLS_CHACHA20_ALT)
+
+#include <stddef.h>
+#include <string.h>
+
+#if defined(MBEDTLS_SELF_TEST)
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf printf
+#endif /* MBEDTLS_PLATFORM_C */
+#endif /* MBEDTLS_SELF_TEST */
+
+#define BYTES_TO_U32_LE( data, offset )                           \
+    ( (uint32_t) data[offset]                                     \
+          | (uint32_t) ( (uint32_t) data[( offset ) + 1] << 8 )   \
+          | (uint32_t) ( (uint32_t) data[( offset ) + 2] << 16 )  \
+          | (uint32_t) ( (uint32_t) data[( offset ) + 3] << 24 )  \
+    )
+
+#define ROTL32( value, amount ) ( (uint32_t) ( value << amount ) | ( value >> ( 32 - amount ) ) )
+
+#define CHACHA20_CTR_INDEX ( 12U )
+
+#define CHACHA20_BLOCK_SIZE_BYTES ( 4U * 16U )
+
+/* Implementation that should never be optimized out by the compiler */
+static void mbedtls_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+/**
+ * \brief           ChaCha20 quarter round operation.
+ *
+ *                  The quarter round is defined as follows (from RFC 7539):
+ *                      1.  a += b; d ^= a; d <<<= 16;
+ *                      2.  c += d; b ^= c; b <<<= 12;
+ *                      3.  a += b; d ^= a; d <<<= 8;
+ *                      4.  c += d; b ^= c; b <<<= 7;
+ *
+ * \param state     ChaCha20 state to modify.
+ * \param a         The index of 'a' in the state.
+ * \param b         The index of 'b' in the state.
+ * \param c         The index of 'c' in the state.
+ * \param d         The index of 'd' in the state.
+ */
+static inline void mbedtls_chacha20_quarter_round( uint32_t state[16],
+                                                   size_t a,
+                                                   size_t b,
+                                                   size_t c,
+                                                   size_t d )
+{
+    /* a += b; d ^= a; d <<<= 16; */
+    state[a] += state[b];
+    state[d] ^= state[a];
+    state[d] = ROTL32( state[d], 16 );
+
+    /* c += d; b ^= c; b <<<= 12 */
+    state[c] += state[d];
+    state[b] ^= state[c];
+    state[b] = ROTL32( state[b], 12 );
+
+    /* a += b; d ^= a; d <<<= 8; */
+    state[a] += state[b];
+    state[d] ^= state[a];
+    state[d] = ROTL32( state[d], 8 );
+
+    /* c += d; b ^= c; b <<<= 7; */
+    state[c] += state[d];
+    state[b] ^= state[c];
+    state[b] = ROTL32( state[b], 7 );
+}
+
+/**
+ * \brief           Perform the ChaCha20 inner block operation.
+ *
+ *                  This function performs two rounds: the column round and the
+ *                  diagonal round.
+ *
+ * \param state     The ChaCha20 state to update.
+ */
+static void mbedtls_chacha20_inner_block( uint32_t state[16] )
+{
+    mbedtls_chacha20_quarter_round( state, 0, 4, 8,  12 );
+    mbedtls_chacha20_quarter_round( state, 1, 5, 9,  13 );
+    mbedtls_chacha20_quarter_round( state, 2, 6, 10, 14 );
+    mbedtls_chacha20_quarter_round( state, 3, 7, 11, 15 );
+
+    mbedtls_chacha20_quarter_round( state, 0, 5, 10, 15 );
+    mbedtls_chacha20_quarter_round( state, 1, 6, 11, 12 );
+    mbedtls_chacha20_quarter_round( state, 2, 7, 8,  13 );
+    mbedtls_chacha20_quarter_round( state, 3, 4, 9,  14 );
+}
+
+/**
+ * \brief               Generates a keystream block.
+ *
+ * \param initial_state The initial ChaCha20 state (containing the key, nonce, counter).
+ * \param working_state This state is used as a temporary working area.
+ * \param keystream     Generated keystream bytes are written to this buffer.
+ */
+static void mbedtls_chacha20_block( const uint32_t initial_state[16],
+                                    uint32_t working_state[16],
+                                    unsigned char keystream[64] )
+{
+    size_t i;
+    size_t offset;
+
+    memcpy( working_state,
+            initial_state,
+            CHACHA20_BLOCK_SIZE_BYTES );
+
+    for ( i = 0U; i < 10U; i++ )
+    {
+        mbedtls_chacha20_inner_block( working_state );
+    }
+
+    working_state[0]  += initial_state[0];
+    working_state[1]  += initial_state[1];
+    working_state[2]  += initial_state[2];
+    working_state[3]  += initial_state[3];
+    working_state[4]  += initial_state[4];
+    working_state[5]  += initial_state[5];
+    working_state[6]  += initial_state[6];
+    working_state[7]  += initial_state[7];
+    working_state[8]  += initial_state[8];
+    working_state[9]  += initial_state[9];
+    working_state[10] += initial_state[10];
+    working_state[11] += initial_state[11];
+    working_state[12] += initial_state[12];
+    working_state[13] += initial_state[13];
+    working_state[14] += initial_state[14];
+    working_state[15] += initial_state[15];
+
+    for ( i = 0U; i < 16; i++ )
+    {
+        offset = i * 4U;
+
+        keystream[offset     ] = (unsigned char)   working_state[i];
+        keystream[offset + 1U] = (unsigned char) ( working_state[i] >> 8  );
+        keystream[offset + 2U] = (unsigned char) ( working_state[i] >> 16 );
+        keystream[offset + 3U] = (unsigned char) ( working_state[i] >> 24 );
+    }
+}
+
+void mbedtls_chacha20_init( mbedtls_chacha20_context *ctx )
+{
+    if ( ctx != NULL )
+    {
+        mbedtls_zeroize( ctx->initial_state, sizeof( ctx->initial_state ) );
+        mbedtls_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
+        mbedtls_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
+
+        /* Initially, there's no keystream bytes available */
+        ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
+    }
+}
+
+void mbedtls_chacha20_free( mbedtls_chacha20_context *ctx )
+{
+    if ( ctx != NULL )
+    {
+        mbedtls_zeroize( ctx, sizeof( mbedtls_chacha20_context ) );
+    }
+}
+
+int mbedtls_chacha20_setkey( mbedtls_chacha20_context *ctx,
+                            const unsigned char key[32] )
+{
+    if ( ( ctx == NULL ) || ( key == NULL ) )
+    {
+        return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    }
+
+    /* ChaCha20 constants - the string "expand 32-byte k" */
+    ctx->initial_state[0] = 0x61707865;
+    ctx->initial_state[1] = 0x3320646e;
+    ctx->initial_state[2] = 0x79622d32;
+    ctx->initial_state[3] = 0x6b206574;
+
+    /* Set key */
+    ctx->initial_state[4]  = BYTES_TO_U32_LE( key, 0 );
+    ctx->initial_state[5]  = BYTES_TO_U32_LE( key, 4 );
+    ctx->initial_state[6]  = BYTES_TO_U32_LE( key, 8 );
+    ctx->initial_state[7]  = BYTES_TO_U32_LE( key, 12 );
+    ctx->initial_state[8]  = BYTES_TO_U32_LE( key, 16 );
+    ctx->initial_state[9]  = BYTES_TO_U32_LE( key, 20 );
+    ctx->initial_state[10] = BYTES_TO_U32_LE( key, 24 );
+    ctx->initial_state[11] = BYTES_TO_U32_LE( key, 28 );
+
+    return( 0 );
+}
+
+int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
+                             const unsigned char nonce[12],
+                             uint32_t counter )
+{
+    if ( ( ctx == NULL ) || ( nonce == NULL ) )
+    {
+        return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    }
+
+    /* Counter */
+    ctx->initial_state[12] = counter;
+
+    /* Nonce */
+    ctx->initial_state[13] = BYTES_TO_U32_LE( nonce, 0 );
+    ctx->initial_state[14] = BYTES_TO_U32_LE( nonce, 4 );
+    ctx->initial_state[15] = BYTES_TO_U32_LE( nonce, 8 );
+
+    mbedtls_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
+    mbedtls_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
+
+    /* Initially, there's no keystream bytes available */
+    ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
+
+    return( 0 );
+}
+
+int mbedtls_chacha20_update( mbedtls_chacha20_context *ctx,
+                              size_t size,
+                              const unsigned char *input,
+                              unsigned char *output )
+{
+    size_t offset = 0U;
+    size_t i;
+
+    if ( ctx == NULL )
+    {
+        return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    }
+    else if ( ( size > 0U ) && ( ( input == NULL ) || ( output == NULL ) ) )
+    {
+        /* input and output pointers are allowed to be NULL only if size == 0 */
+        return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    }
+
+    /* Use leftover keystream bytes, if available */
+    while ( ( size > 0U ) && ( ctx->keystream_bytes_used < CHACHA20_BLOCK_SIZE_BYTES ) )
+    {
+        output[offset] = input[offset] ^ ctx->keystream8[ctx->keystream_bytes_used];
+
+        ctx->keystream_bytes_used++;
+        offset++;
+        size--;
+    }
+
+    /* Process full blocks */
+    while ( size >= CHACHA20_BLOCK_SIZE_BYTES )
+    {
+        /* Generate new keystream block and increment counter */
+        mbedtls_chacha20_block( ctx->initial_state, ctx->working_state, ctx->keystream8 );
+        ctx->initial_state[CHACHA20_CTR_INDEX]++;
+
+        for ( i = 0U; i < 64U; i += 8U )
+        {
+            output[offset + i      ] = input[offset + i      ] ^ ctx->keystream8[i      ];
+            output[offset + i + 1U ] = input[offset + i + 1U ] ^ ctx->keystream8[i + 1U ];
+            output[offset + i + 2U ] = input[offset + i + 2U ] ^ ctx->keystream8[i + 2U ];
+            output[offset + i + 3U ] = input[offset + i + 3U ] ^ ctx->keystream8[i + 3U ];
+            output[offset + i + 4U ] = input[offset + i + 4U ] ^ ctx->keystream8[i + 4U ];
+            output[offset + i + 5U ] = input[offset + i + 5U ] ^ ctx->keystream8[i + 5U ];
+            output[offset + i + 6U ] = input[offset + i + 6U ] ^ ctx->keystream8[i + 6U ];
+            output[offset + i + 7U ] = input[offset + i + 7U ] ^ ctx->keystream8[i + 7U ];
+        }
+
+        offset += CHACHA20_BLOCK_SIZE_BYTES;
+        size   -= CHACHA20_BLOCK_SIZE_BYTES;
+    }
+
+    /* Last (partial) block */
+    if ( size > 0U )
+    {
+        /* Generate new keystream block and increment counter */
+        mbedtls_chacha20_block( ctx->initial_state, ctx->working_state, ctx->keystream8 );
+        ctx->initial_state[CHACHA20_CTR_INDEX]++;
+
+        for ( i = 0U; i < size; i++)
+        {
+            output[offset + i] = input[offset + i] ^ ctx->keystream8[i];
+        }
+
+        ctx->keystream_bytes_used = size;
+
+    }
+
+    return( 0 );
+}
+
+int mbedtls_chacha20_crypt( const unsigned char key[32],
+                            const unsigned char nonce[12],
+                            uint32_t counter,
+                            size_t data_len,
+                            const unsigned char* input,
+                            unsigned char* output )
+{
+    mbedtls_chacha20_context ctx;
+    int result;
+
+    mbedtls_chacha20_init( &ctx );
+
+    result = mbedtls_chacha20_setkey( &ctx, key );
+    if ( result != 0 )
+        goto cleanup;
+
+    result = mbedtls_chacha20_starts( &ctx, nonce, counter );
+    if ( result != 0 )
+        goto cleanup;
+
+    result = mbedtls_chacha20_update( &ctx, data_len, input, output );
+
+cleanup:
+    mbedtls_chacha20_free( &ctx );
+    return( result );
+}
+
+#endif /* !MBEDTLS_CHACHA20_ALT */
+
+#if defined(MBEDTLS_SELF_TEST)
+
+static const unsigned char test_keys[2][32] =
+{
+    {
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+    },
+    {
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01
+    }
+};
+
+static const unsigned char test_nonces[2][12] =
+{
+    {
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00
+    },
+    {
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x02
+    }
+};
+
+static const uint32_t test_counters[2] =
+{
+    0U,
+    1U
+};
+
+static const unsigned char test_input[2][375] =
+{
+    {
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+    },
+    {
+        0x41, 0x6e, 0x79, 0x20, 0x73, 0x75, 0x62, 0x6d,
+        0x69, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x74,
+        0x6f, 0x20, 0x74, 0x68, 0x65, 0x20, 0x49, 0x45,
+        0x54, 0x46, 0x20, 0x69, 0x6e, 0x74, 0x65, 0x6e,
+        0x64, 0x65, 0x64, 0x20, 0x62, 0x79, 0x20, 0x74,
+        0x68, 0x65, 0x20, 0x43, 0x6f, 0x6e, 0x74, 0x72,
+        0x69, 0x62, 0x75, 0x74, 0x6f, 0x72, 0x20, 0x66,
+        0x6f, 0x72, 0x20, 0x70, 0x75, 0x62, 0x6c, 0x69,
+        0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x61,
+        0x73, 0x20, 0x61, 0x6c, 0x6c, 0x20, 0x6f, 0x72,
+        0x20, 0x70, 0x61, 0x72, 0x74, 0x20, 0x6f, 0x66,
+        0x20, 0x61, 0x6e, 0x20, 0x49, 0x45, 0x54, 0x46,
+        0x20, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65,
+        0x74, 0x2d, 0x44, 0x72, 0x61, 0x66, 0x74, 0x20,
+        0x6f, 0x72, 0x20, 0x52, 0x46, 0x43, 0x20, 0x61,
+        0x6e, 0x64, 0x20, 0x61, 0x6e, 0x79, 0x20, 0x73,
+        0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e, 0x74,
+        0x20, 0x6d, 0x61, 0x64, 0x65, 0x20, 0x77, 0x69,
+        0x74, 0x68, 0x69, 0x6e, 0x20, 0x74, 0x68, 0x65,
+        0x20, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x78, 0x74,
+        0x20, 0x6f, 0x66, 0x20, 0x61, 0x6e, 0x20, 0x49,
+        0x45, 0x54, 0x46, 0x20, 0x61, 0x63, 0x74, 0x69,
+        0x76, 0x69, 0x74, 0x79, 0x20, 0x69, 0x73, 0x20,
+        0x63, 0x6f, 0x6e, 0x73, 0x69, 0x64, 0x65, 0x72,
+        0x65, 0x64, 0x20, 0x61, 0x6e, 0x20, 0x22, 0x49,
+        0x45, 0x54, 0x46, 0x20, 0x43, 0x6f, 0x6e, 0x74,
+        0x72, 0x69, 0x62, 0x75, 0x74, 0x69, 0x6f, 0x6e,
+        0x22, 0x2e, 0x20, 0x53, 0x75, 0x63, 0x68, 0x20,
+        0x73, 0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e,
+        0x74, 0x73, 0x20, 0x69, 0x6e, 0x63, 0x6c, 0x75,
+        0x64, 0x65, 0x20, 0x6f, 0x72, 0x61, 0x6c, 0x20,
+        0x73, 0x74, 0x61, 0x74, 0x65, 0x6d, 0x65, 0x6e,
+        0x74, 0x73, 0x20, 0x69, 0x6e, 0x20, 0x49, 0x45,
+        0x54, 0x46, 0x20, 0x73, 0x65, 0x73, 0x73, 0x69,
+        0x6f, 0x6e, 0x73, 0x2c, 0x20, 0x61, 0x73, 0x20,
+        0x77, 0x65, 0x6c, 0x6c, 0x20, 0x61, 0x73, 0x20,
+        0x77, 0x72, 0x69, 0x74, 0x74, 0x65, 0x6e, 0x20,
+        0x61, 0x6e, 0x64, 0x20, 0x65, 0x6c, 0x65, 0x63,
+        0x74, 0x72, 0x6f, 0x6e, 0x69, 0x63, 0x20, 0x63,
+        0x6f, 0x6d, 0x6d, 0x75, 0x6e, 0x69, 0x63, 0x61,
+        0x74, 0x69, 0x6f, 0x6e, 0x73, 0x20, 0x6d, 0x61,
+        0x64, 0x65, 0x20, 0x61, 0x74, 0x20, 0x61, 0x6e,
+        0x79, 0x20, 0x74, 0x69, 0x6d, 0x65, 0x20, 0x6f,
+        0x72, 0x20, 0x70, 0x6c, 0x61, 0x63, 0x65, 0x2c,
+        0x20, 0x77, 0x68, 0x69, 0x63, 0x68, 0x20, 0x61,
+        0x72, 0x65, 0x20, 0x61, 0x64, 0x64, 0x72, 0x65,
+        0x73, 0x73, 0x65, 0x64, 0x20, 0x74, 0x6f
+    }
+};
+
+static const unsigned char test_output[2][375] =
+{
+    {
+        0x76, 0xb8, 0xe0, 0xad, 0xa0, 0xf1, 0x3d, 0x90,
+        0x40, 0x5d, 0x6a, 0xe5, 0x53, 0x86, 0xbd, 0x28,
+        0xbd, 0xd2, 0x19, 0xb8, 0xa0, 0x8d, 0xed, 0x1a,
+        0xa8, 0x36, 0xef, 0xcc, 0x8b, 0x77, 0x0d, 0xc7,
+        0xda, 0x41, 0x59, 0x7c, 0x51, 0x57, 0x48, 0x8d,
+        0x77, 0x24, 0xe0, 0x3f, 0xb8, 0xd8, 0x4a, 0x37,
+        0x6a, 0x43, 0xb8, 0xf4, 0x15, 0x18, 0xa1, 0x1c,
+        0xc3, 0x87, 0xb6, 0x69, 0xb2, 0xee, 0x65, 0x86
+    },
+    {
+        0xa3, 0xfb, 0xf0, 0x7d, 0xf3, 0xfa, 0x2f, 0xde,
+        0x4f, 0x37, 0x6c, 0xa2, 0x3e, 0x82, 0x73, 0x70,
+        0x41, 0x60, 0x5d, 0x9f, 0x4f, 0x4f, 0x57, 0xbd,
+        0x8c, 0xff, 0x2c, 0x1d, 0x4b, 0x79, 0x55, 0xec,
+        0x2a, 0x97, 0x94, 0x8b, 0xd3, 0x72, 0x29, 0x15,
+        0xc8, 0xf3, 0xd3, 0x37, 0xf7, 0xd3, 0x70, 0x05,
+        0x0e, 0x9e, 0x96, 0xd6, 0x47, 0xb7, 0xc3, 0x9f,
+        0x56, 0xe0, 0x31, 0xca, 0x5e, 0xb6, 0x25, 0x0d,
+        0x40, 0x42, 0xe0, 0x27, 0x85, 0xec, 0xec, 0xfa,
+        0x4b, 0x4b, 0xb5, 0xe8, 0xea, 0xd0, 0x44, 0x0e,
+        0x20, 0xb6, 0xe8, 0xdb, 0x09, 0xd8, 0x81, 0xa7,
+        0xc6, 0x13, 0x2f, 0x42, 0x0e, 0x52, 0x79, 0x50,
+        0x42, 0xbd, 0xfa, 0x77, 0x73, 0xd8, 0xa9, 0x05,
+        0x14, 0x47, 0xb3, 0x29, 0x1c, 0xe1, 0x41, 0x1c,
+        0x68, 0x04, 0x65, 0x55, 0x2a, 0xa6, 0xc4, 0x05,
+        0xb7, 0x76, 0x4d, 0x5e, 0x87, 0xbe, 0xa8, 0x5a,
+        0xd0, 0x0f, 0x84, 0x49, 0xed, 0x8f, 0x72, 0xd0,
+        0xd6, 0x62, 0xab, 0x05, 0x26, 0x91, 0xca, 0x66,
+        0x42, 0x4b, 0xc8, 0x6d, 0x2d, 0xf8, 0x0e, 0xa4,
+        0x1f, 0x43, 0xab, 0xf9, 0x37, 0xd3, 0x25, 0x9d,
+        0xc4, 0xb2, 0xd0, 0xdf, 0xb4, 0x8a, 0x6c, 0x91,
+        0x39, 0xdd, 0xd7, 0xf7, 0x69, 0x66, 0xe9, 0x28,
+        0xe6, 0x35, 0x55, 0x3b, 0xa7, 0x6c, 0x5c, 0x87,
+        0x9d, 0x7b, 0x35, 0xd4, 0x9e, 0xb2, 0xe6, 0x2b,
+        0x08, 0x71, 0xcd, 0xac, 0x63, 0x89, 0x39, 0xe2,
+        0x5e, 0x8a, 0x1e, 0x0e, 0xf9, 0xd5, 0x28, 0x0f,
+        0xa8, 0xca, 0x32, 0x8b, 0x35, 0x1c, 0x3c, 0x76,
+        0x59, 0x89, 0xcb, 0xcf, 0x3d, 0xaa, 0x8b, 0x6c,
+        0xcc, 0x3a, 0xaf, 0x9f, 0x39, 0x79, 0xc9, 0x2b,
+        0x37, 0x20, 0xfc, 0x88, 0xdc, 0x95, 0xed, 0x84,
+        0xa1, 0xbe, 0x05, 0x9c, 0x64, 0x99, 0xb9, 0xfd,
+        0xa2, 0x36, 0xe7, 0xe8, 0x18, 0xb0, 0x4b, 0x0b,
+        0xc3, 0x9c, 0x1e, 0x87, 0x6b, 0x19, 0x3b, 0xfe,
+        0x55, 0x69, 0x75, 0x3f, 0x88, 0x12, 0x8c, 0xc0,
+        0x8a, 0xaa, 0x9b, 0x63, 0xd1, 0xa1, 0x6f, 0x80,
+        0xef, 0x25, 0x54, 0xd7, 0x18, 0x9c, 0x41, 0x1f,
+        0x58, 0x69, 0xca, 0x52, 0xc5, 0xb8, 0x3f, 0xa3,
+        0x6f, 0xf2, 0x16, 0xb9, 0xc1, 0xd3, 0x00, 0x62,
+        0xbe, 0xbc, 0xfd, 0x2d, 0xc5, 0xbc, 0xe0, 0x91,
+        0x19, 0x34, 0xfd, 0xa7, 0x9a, 0x86, 0xf6, 0xe6,
+        0x98, 0xce, 0xd7, 0x59, 0xc3, 0xff, 0x9b, 0x64,
+        0x77, 0x33, 0x8f, 0x3d, 0xa4, 0xf9, 0xcd, 0x85,
+        0x14, 0xea, 0x99, 0x82, 0xcc, 0xaf, 0xb3, 0x41,
+        0xb2, 0x38, 0x4d, 0xd9, 0x02, 0xf3, 0xd1, 0xab,
+        0x7a, 0xc6, 0x1d, 0xd2, 0x9c, 0x6f, 0x21, 0xba,
+        0x5b, 0x86, 0x2f, 0x37, 0x30, 0xe3, 0x7c, 0xfd,
+        0xc4, 0xfd, 0x80, 0x6c, 0x22, 0xf2, 0x21
+    }
+};
+
+static const size_t test_lengths[2] =
+{
+    64U,
+    375U
+};
+
+#define ASSERT( cond, args )            \
+    do                                  \
+    {                                   \
+        if( ! ( cond ) )                \
+        {                               \
+            if( verbose != 0 )          \
+                mbedtls_printf args;    \
+                                        \
+            return( -1 );               \
+        }                               \
+    }                                   \
+    while( 0 )
+
+int mbedtls_chacha20_self_test( int verbose )
+{
+    unsigned char output[381];
+    unsigned i;
+    int result;
+
+    for( i = 0U; i < 2U; i++ )
+    {
+        if( verbose != 0 )
+            mbedtls_printf( "  ChaCha20 test %u ", i );
+
+        result = mbedtls_chacha20_crypt( test_keys[i],
+                                         test_nonces[i],
+                                         test_counters[i],
+                                         test_lengths[i],
+                                         test_input[i],
+                                         output );
+
+        ASSERT( 0 == result, ( "error code: %i\n", result ) );
+
+        ASSERT( 0 == memcmp( output, test_output[i], test_lengths[i] ),
+                ( "failed (output)\n" ) );
+
+        if( verbose != 0 )
+            mbedtls_printf( "passed\n" );
+    }
+
+    if( verbose != 0 )
+        mbedtls_printf( "\n" );
+
+    return( 0 );
+}
+
+#endif /* MBEDTLS_SELF_TEST */
+
+#endif /* !MBEDTLS_CHACHA20_C */
diff --git a/library/chachapoly.c b/library/chachapoly.c
new file mode 100644
index 0000000..ebf25bb
--- /dev/null
+++ b/library/chachapoly.c
@@ -0,0 +1,518 @@
+/**
+ * \file chachapoly.c
+ *
+ * \brief ChaCha20-Poly1305 AEAD construction based on RFC 7539.
+ *
+ *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+
+#include "mbedtls/chachapoly.h"
+#include <string.h>
+
+#if defined(MBEDTLS_SELF_TEST)
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf printf
+#endif /* MBEDTLS_PLATFORM_C */
+#endif /* MBEDTLS_SELF_TEST */
+
+#if !defined(MBEDTLS_CHACHAPOLY_ALT)
+
+#define CHACHAPOLY_STATE_INIT       ( 0 )
+#define CHACHAPOLY_STATE_AAD        ( 1 )
+#define CHACHAPOLY_STATE_CIPHERTEXT ( 2 ) /* Encrypting or decrypting */
+#define CHACHAPOLY_STATE_FINISHED   ( 3 )
+
+/* Implementation that should never be optimized out by the compiler */
+static void mbedtls_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+/**
+ * \brief           Adds padding bytes (zeroes) to pad the AAD for Poly1305.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context.
+ */
+static void mbedtls_chachapoly_pad_aad( mbedtls_chachapoly_context *ctx )
+{
+    uint32_t partial_block_len = (uint32_t) ( ctx->aad_len % 16U );
+    unsigned char zeroes[15];
+
+    if ( partial_block_len > 0U )
+    {
+        memset( zeroes, 0, sizeof( zeroes ) );
+        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx,
+                                        zeroes,
+                                        16U - partial_block_len );
+    }
+}
+
+/**
+ * \brief           Adds padding bytes (zeroes) to pad the ciphertext for Poly1305.
+ *
+ * \param ctx       The ChaCha20-Poly1305 context.
+ */
+static void mbedtls_chachapoly_pad_ciphertext( mbedtls_chachapoly_context *ctx )
+{
+    uint32_t partial_block_len = (uint32_t) ( ctx->ciphertext_len % 16U );
+    unsigned char zeroes[15];
+
+    if ( partial_block_len > 0U )
+    {
+        memset( zeroes, 0, sizeof( zeroes ) );
+        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx,
+                                        zeroes,
+                                        16U - partial_block_len );
+    }
+}
+
+void mbedtls_chachapoly_init( mbedtls_chachapoly_context *ctx )
+{
+    if ( ctx != NULL )
+    {
+        mbedtls_chacha20_init( &ctx->chacha20_ctx );
+        mbedtls_poly1305_init( &ctx->poly1305_ctx );
+        ctx->aad_len        = 0U;
+        ctx->ciphertext_len = 0U;
+        ctx->state          = CHACHAPOLY_STATE_INIT;
+        ctx->mode           = MBEDTLS_CHACHAPOLY_ENCRYPT;
+    }
+}
+
+void mbedtls_chachapoly_free( mbedtls_chachapoly_context *ctx )
+{
+    if ( ctx != NULL )
+    {
+        mbedtls_chacha20_free( &ctx->chacha20_ctx );
+        mbedtls_poly1305_free( &ctx->poly1305_ctx );
+        ctx->aad_len        = 0U;
+        ctx->ciphertext_len = 0U;
+        ctx->state          = CHACHAPOLY_STATE_INIT;
+        ctx->mode           = MBEDTLS_CHACHAPOLY_ENCRYPT;
+    }
+}
+
+int mbedtls_chachapoly_setkey( mbedtls_chachapoly_context *ctx,
+                               const unsigned char key[32] )
+{
+    int result;
+
+    if ( ( ctx == NULL ) || ( key == NULL ) )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+
+    result = mbedtls_chacha20_setkey( &ctx->chacha20_ctx, key );
+
+    return( result );
+}
+
+int mbedtls_chachapoly_starts( mbedtls_chachapoly_context *ctx,
+                               const unsigned char nonce[12],
+                               mbedtls_chachapoly_mode_t mode  )
+{
+    int result;
+    unsigned char poly1305_key[64];
+
+    if ( ( ctx == NULL ) || ( nonce == NULL ) )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+
+    /* Set counter = 0, will be update to 1 when generating Poly1305 key */
+    result = mbedtls_chacha20_starts( &ctx->chacha20_ctx, nonce, 0U );
+    if ( result != 0 )
+        goto cleanup;
+
+    /* Generate the Poly1305 key by getting the ChaCha20 keystream output with counter = 0.
+     * This is the same as encrypting a buffer of zeroes.
+     * Only the first 256-bits (32 bytes) of the key is used for Poly1305.
+     * The other 256 bits are discarded.
+     */
+    memset( poly1305_key, 0, sizeof( poly1305_key ) );
+    result = mbedtls_chacha20_update( &ctx->chacha20_ctx, sizeof( poly1305_key ),
+                                      poly1305_key, poly1305_key );
+    if ( result != 0 )
+        goto cleanup;
+
+    result = mbedtls_poly1305_starts( &ctx->poly1305_ctx, poly1305_key );
+
+    if ( result == 0 )
+    {
+        ctx->aad_len        = 0U;
+        ctx->ciphertext_len = 0U;
+        ctx->state          = CHACHAPOLY_STATE_AAD;
+        ctx->mode           = mode;
+    }
+
+cleanup:
+    mbedtls_zeroize( poly1305_key, 64U );
+    return( result );
+}
+
+int mbedtls_chachapoly_update_aad( mbedtls_chachapoly_context *ctx,
+                                   const unsigned char *aad,
+                                   size_t aad_len )
+{
+    if ( ctx == NULL )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+    else if ( ( aad_len > 0U ) && ( aad == NULL ) )
+    {
+        /* aad pointer is allowed to be NULL if aad_len == 0 */
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+    else if ( ctx->state != CHACHAPOLY_STATE_AAD )
+    {
+        return(MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    }
+
+    ctx->aad_len += aad_len;
+
+    return( mbedtls_poly1305_update( &ctx->poly1305_ctx, aad, aad_len ) );
+}
+
+int mbedtls_chachapoly_update( mbedtls_chachapoly_context *ctx,
+                               size_t len,
+                               const unsigned char *input,
+                               unsigned char *output )
+{
+    if ( ctx == NULL )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+    else if ( ( len > 0U ) && ( ( input == NULL ) || ( output == NULL ) ) )
+    {
+        /* input and output pointers are allowed to be NULL if len == 0 */
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+    else if ( ( ctx->state != CHACHAPOLY_STATE_AAD ) &&
+              ( ctx->state != CHACHAPOLY_STATE_CIPHERTEXT ) )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    }
+
+    if ( ctx->state == CHACHAPOLY_STATE_AAD )
+    {
+        ctx->state = CHACHAPOLY_STATE_CIPHERTEXT;
+
+        mbedtls_chachapoly_pad_aad( ctx );
+    }
+
+    ctx->ciphertext_len += len;
+
+    if ( ctx->mode == MBEDTLS_CHACHAPOLY_ENCRYPT )
+    {
+        /* Note: the following functions return an error only if one or more of
+         *       the input pointers are NULL. Since we have checked their validity
+         *       above, we can safety ignore the return value.
+         */
+        (void) mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
+        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, output, len );
+    }
+    else /* DECRYPT */
+    {
+        (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, input, len );
+        (void) mbedtls_chacha20_update( &ctx->chacha20_ctx, len, input, output );
+    }
+
+    return( 0 );
+}
+
+int mbedtls_chachapoly_finish( mbedtls_chachapoly_context *ctx,
+                               unsigned char mac[16] )
+{
+    unsigned char len_block[16];
+
+    if ( ( ctx == NULL ) || ( mac == NULL ) )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    }
+    else if ( ctx->state == CHACHAPOLY_STATE_INIT )
+    {
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    }
+
+    if ( ctx->state == CHACHAPOLY_STATE_AAD )
+    {
+        mbedtls_chachapoly_pad_aad( ctx );
+    }
+    else if ( ctx->state == CHACHAPOLY_STATE_CIPHERTEXT )
+    {
+        mbedtls_chachapoly_pad_ciphertext( ctx );
+    }
+
+    ctx->state = CHACHAPOLY_STATE_FINISHED;
+
+    /* The lengths of the AAD and ciphertext are processed by
+     * Poly1305 as the final 128-bit block, encoded as little-endian integers.
+     */
+    len_block[0]  = (unsigned char) ctx->aad_len;
+    len_block[1]  = (unsigned char) ( ctx->aad_len >> 8 );
+    len_block[2]  = (unsigned char) ( ctx->aad_len >> 16 );
+    len_block[3]  = (unsigned char) ( ctx->aad_len >> 24 );
+    len_block[4]  = (unsigned char) ( ctx->aad_len >> 32 );
+    len_block[5]  = (unsigned char) ( ctx->aad_len >> 40 );
+    len_block[6]  = (unsigned char) ( ctx->aad_len >> 48 );
+    len_block[7]  = (unsigned char) ( ctx->aad_len >> 56 );
+    len_block[8]  = (unsigned char) ctx->ciphertext_len;
+    len_block[9]  = (unsigned char) ( ctx->ciphertext_len >> 8 );
+    len_block[10] = (unsigned char) ( ctx->ciphertext_len >> 16 );
+    len_block[11] = (unsigned char) ( ctx->ciphertext_len >> 24 );
+    len_block[12] = (unsigned char) ( ctx->ciphertext_len >> 32 );
+    len_block[13] = (unsigned char) ( ctx->ciphertext_len >> 40 );
+    len_block[14] = (unsigned char) ( ctx->ciphertext_len >> 48 );
+    len_block[15] = (unsigned char) ( ctx->ciphertext_len >> 56 );
+
+    (void) mbedtls_poly1305_update( &ctx->poly1305_ctx, len_block, 16U );
+    (void) mbedtls_poly1305_finish( &ctx->poly1305_ctx, mac );
+
+    return( 0 );
+}
+
+int mbedtls_chachapoly_crypt_and_tag( mbedtls_chachapoly_context *ctx,
+                                      mbedtls_chachapoly_mode_t mode,
+                                      size_t length,
+                                      const unsigned char nonce[12],
+                                      const unsigned char *aad,
+                                      size_t aad_len,
+                                      const unsigned char *input,
+                                      unsigned char *output,
+                                      unsigned char tag[16] )
+{
+    int result;
+
+    result = mbedtls_chachapoly_starts( ctx, nonce, mode );
+    if ( result != 0 )
+        goto cleanup;
+
+    result = mbedtls_chachapoly_update_aad( ctx, aad, aad_len );
+    if ( result != 0 )
+            goto cleanup;
+
+    result = mbedtls_chachapoly_update( ctx, length, input, output );
+    if ( result != 0 )
+            goto cleanup;
+
+    result = mbedtls_chachapoly_finish( ctx, tag );
+
+cleanup:
+    return( result );
+}
+
+int mbedtls_chachapoly_auth_decrypt( mbedtls_chachapoly_context *ctx,
+                                     size_t length,
+                                     const unsigned char nonce[12],
+                                     const unsigned char *aad,
+                                     size_t aad_len,
+                                     const unsigned char tag[16],
+                                     const unsigned char *input,
+                                     unsigned char *output )
+{
+    int ret;
+    unsigned char check_tag[16];
+    size_t i;
+    int diff;
+
+    if( tag == NULL )
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    if( ( ret = mbedtls_chachapoly_crypt_and_tag( ctx,
+                        MBEDTLS_CHACHAPOLY_DECRYPT, length, nonce,
+                        aad, aad_len, input, output, check_tag ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    /* Check tag in "constant-time" */
+    for( diff = 0, i = 0; i < sizeof( check_tag ); i++ )
+        diff |= tag[i] ^ check_tag[i];
+
+    if( diff != 0 )
+    {
+        mbedtls_zeroize( output, length );
+        return( MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED );
+    }
+
+    return( 0 );
+}
+
+#endif /* MBEDTLS_CHACHAPOLY_ALT */
+
+#if defined(MBEDTLS_SELF_TEST)
+
+static const unsigned char test_key[1][32] =
+{
+    {
+        0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+        0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+        0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+        0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f
+    }
+};
+
+static const unsigned char test_nonce[1][12] =
+{
+    {
+        0x07, 0x00, 0x00, 0x00,                         /* 32-bit common part */
+        0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47  /* 64-bit IV */
+    }
+};
+
+static const unsigned char test_aad[1][12] =
+{
+    {
+        0x50, 0x51, 0x52, 0x53, 0xc0, 0xc1, 0xc2, 0xc3,
+        0xc4, 0xc5, 0xc6, 0xc7
+    }
+};
+
+static const size_t test_aad_len[1] =
+{
+    12U
+};
+
+static const unsigned char test_input[1][114] =
+{
+    {
+        0x4c, 0x61, 0x64, 0x69, 0x65, 0x73, 0x20, 0x61,
+        0x6e, 0x64, 0x20, 0x47, 0x65, 0x6e, 0x74, 0x6c,
+        0x65, 0x6d, 0x65, 0x6e, 0x20, 0x6f, 0x66, 0x20,
+        0x74, 0x68, 0x65, 0x20, 0x63, 0x6c, 0x61, 0x73,
+        0x73, 0x20, 0x6f, 0x66, 0x20, 0x27, 0x39, 0x39,
+        0x3a, 0x20, 0x49, 0x66, 0x20, 0x49, 0x20, 0x63,
+        0x6f, 0x75, 0x6c, 0x64, 0x20, 0x6f, 0x66, 0x66,
+        0x65, 0x72, 0x20, 0x79, 0x6f, 0x75, 0x20, 0x6f,
+        0x6e, 0x6c, 0x79, 0x20, 0x6f, 0x6e, 0x65, 0x20,
+        0x74, 0x69, 0x70, 0x20, 0x66, 0x6f, 0x72, 0x20,
+        0x74, 0x68, 0x65, 0x20, 0x66, 0x75, 0x74, 0x75,
+        0x72, 0x65, 0x2c, 0x20, 0x73, 0x75, 0x6e, 0x73,
+        0x63, 0x72, 0x65, 0x65, 0x6e, 0x20, 0x77, 0x6f,
+        0x75, 0x6c, 0x64, 0x20, 0x62, 0x65, 0x20, 0x69,
+        0x74, 0x2e
+    }
+};
+
+static const unsigned char test_output[1][114] =
+{
+    {
+        0xd3, 0x1a, 0x8d, 0x34, 0x64, 0x8e, 0x60, 0xdb,
+        0x7b, 0x86, 0xaf, 0xbc, 0x53, 0xef, 0x7e, 0xc2,
+        0xa4, 0xad, 0xed, 0x51, 0x29, 0x6e, 0x08, 0xfe,
+        0xa9, 0xe2, 0xb5, 0xa7, 0x36, 0xee, 0x62, 0xd6,
+        0x3d, 0xbe, 0xa4, 0x5e, 0x8c, 0xa9, 0x67, 0x12,
+        0x82, 0xfa, 0xfb, 0x69, 0xda, 0x92, 0x72, 0x8b,
+        0x1a, 0x71, 0xde, 0x0a, 0x9e, 0x06, 0x0b, 0x29,
+        0x05, 0xd6, 0xa5, 0xb6, 0x7e, 0xcd, 0x3b, 0x36,
+        0x92, 0xdd, 0xbd, 0x7f, 0x2d, 0x77, 0x8b, 0x8c,
+        0x98, 0x03, 0xae, 0xe3, 0x28, 0x09, 0x1b, 0x58,
+        0xfa, 0xb3, 0x24, 0xe4, 0xfa, 0xd6, 0x75, 0x94,
+        0x55, 0x85, 0x80, 0x8b, 0x48, 0x31, 0xd7, 0xbc,
+        0x3f, 0xf4, 0xde, 0xf0, 0x8e, 0x4b, 0x7a, 0x9d,
+        0xe5, 0x76, 0xd2, 0x65, 0x86, 0xce, 0xc6, 0x4b,
+        0x61, 0x16
+    }
+};
+
+static const size_t test_input_len[1] =
+{
+    114U
+};
+
+static const unsigned char test_mac[1][16] =
+{
+    {
+        0x1a, 0xe1, 0x0b, 0x59, 0x4f, 0x09, 0xe2, 0x6a,
+        0x7e, 0x90, 0x2e, 0xcb, 0xd0, 0x60, 0x06, 0x91
+    }
+};
+
+#define ASSERT( cond, args )            \
+    do                                  \
+    {                                   \
+        if( ! ( cond ) )                \
+        {                               \
+            if( verbose != 0 )          \
+                mbedtls_printf args;    \
+                                        \
+            return( -1 );               \
+        }                               \
+    }                                   \
+    while( 0 )
+
+int mbedtls_chachapoly_self_test( int verbose )
+{
+    mbedtls_chachapoly_context ctx;
+    unsigned i;
+    int result;
+    unsigned char output[200];
+    unsigned char mac[16];
+
+    for( i = 0U; i < 1U; i++ )
+    {
+        if( verbose != 0 )
+            mbedtls_printf( "  ChaCha20-Poly1305 test %u ", i );
+
+        mbedtls_chachapoly_init( &ctx );
+
+        result = mbedtls_chachapoly_setkey( &ctx, test_key[i] );
+        ASSERT( 0 == result, ( "setkey() error code: %i\n", result ) );
+
+        result = mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                                   MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                                   test_input_len[i],
+                                                   test_nonce[i],
+                                                   test_aad[i],
+                                                   test_aad_len[i],
+                                                   test_input[i],
+                                                   output,
+                                                   mac );
+
+        ASSERT( 0 == result, ( "crypt_and_tag() error code: %i\n", result ) );
+
+        ASSERT( 0 == memcmp( output, test_output[i], test_input_len[i] ),
+                ( "failure (wrong output)\n" ) );
+
+        ASSERT( 0 == memcmp( mac, test_mac[i], 16U ),
+                ( "failure (wrong MAC)\n" ) );
+
+        mbedtls_chachapoly_free( &ctx );
+
+        if( verbose != 0 )
+            mbedtls_printf( "passed\n" );
+    }
+
+    if( verbose != 0 )
+        mbedtls_printf( "\n" );
+
+    return( 0 );
+}
+
+#endif /* MBEDTLS_SELF_TEST */
+
+#endif /* MBEDTLS_CHACHAPOLY_C */
diff --git a/library/cipher.c b/library/cipher.c
index 74fd950..b204bcb 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -38,6 +38,10 @@
 #include <stdlib.h>
 #include <string.h>
 
+#if defined(MBEDTLS_CHACHAPOLY_C)
+#include "mbedtls/chachapoly.h"
+#endif
+
 #if defined(MBEDTLS_GCM_C)
 #include "mbedtls/gcm.h"
 #endif
@@ -46,6 +50,10 @@
 #include "mbedtls/ccm.h"
 #endif
 
+#if defined(MBEDTLS_CHACHA20_C)
+#include "mbedtls/chacha20.h"
+#endif
+
 #if defined(MBEDTLS_CMAC_C)
 #include "mbedtls/cmac.h"
 #endif
@@ -61,6 +69,27 @@
 #define MBEDTLS_CIPHER_MODE_STREAM
 #endif
 
+
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
+/* Compare the contents of two buffers in constant time.
+ * Returns 0 if the contents are bitwise identical, otherwise returns
+ * a non-zero value.
+ * This is currently only used by GCM and ChaCha20+Poly1305.
+ */
+static int mbedtls_constant_time_memcmp( const void *v1, const void *v2, size_t len )
+{
+    const unsigned char *p1 = (const unsigned char*) v1;
+    const unsigned char *p2 = (const unsigned char*) v2;
+    size_t i;
+    unsigned char diff;
+
+    for( diff = 0, i = 0; i < len; i++ )
+        diff |= p1[i] ^ p2[i];
+
+    return (int)diff;
+}
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
+
 static int supported_init = 0;
 
 const int *mbedtls_cipher_list( void )
@@ -232,6 +261,18 @@
             return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
     }
 
+#if defined(MBEDTLS_CHACHA20_C)
+    if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
+    {
+        if ( 0 != mbedtls_chacha20_starts( (mbedtls_chacha20_context*)ctx->cipher_ctx,
+                                           iv,
+                                           0U ) ) /* Initial counter value */
+        {
+            return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+        }
+    }
+#endif
+
     memcpy( ctx->iv, iv, actual_iv_size );
     ctx->iv_size = actual_iv_size;
 
@@ -248,22 +289,45 @@
     return( 0 );
 }
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
 int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
                       const unsigned char *ad, size_t ad_len )
 {
     if( NULL == ctx || NULL == ctx->cipher_info )
         return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
 
+#if defined(MBEDTLS_GCM_C)
     if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
     {
         return mbedtls_gcm_starts( (mbedtls_gcm_context *) ctx->cipher_ctx, ctx->operation,
                            ctx->iv, ctx->iv_size, ad, ad_len );
     }
+#endif
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
+    {
+        int result;
+        mbedtls_chachapoly_mode_t mode;
+
+        mode = ( ctx->operation == MBEDTLS_ENCRYPT )
+                ? MBEDTLS_CHACHAPOLY_ENCRYPT
+                : MBEDTLS_CHACHAPOLY_DECRYPT;
+
+        result = mbedtls_chachapoly_starts( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
+                                                        ctx->iv,
+                                                        mode );
+        if ( result != 0 )
+            return( result );
+
+        return mbedtls_chachapoly_update_aad( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
+                                                          ad, ad_len );
+    }
+#endif
 
     return( 0 );
 }
-#endif /* MBEDTLS_GCM_C */
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
 
 int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input,
                    size_t ilen, unsigned char *output, size_t *olen )
@@ -304,6 +368,15 @@
     }
 #endif
 
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 )
+    {
+        *olen = ilen;
+        return mbedtls_chachapoly_update( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
+                                                      ilen, input, output );
+    }
+#endif
+
     if ( 0 == block_size )
     {
         return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
@@ -685,6 +758,12 @@
         return( 0 );
     }
 
+    if ( ( MBEDTLS_CIPHER_CHACHA20          == ctx->cipher_info->type ) ||
+         ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) )
+    {
+        return( 0 );
+    }
+
     if( MBEDTLS_MODE_ECB == ctx->cipher_info->mode )
     {
         if( ctx->unprocessed_len != 0 )
@@ -796,7 +875,7 @@
 }
 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
 int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
                       unsigned char *tag, size_t tag_len )
 {
@@ -806,8 +885,22 @@
     if( MBEDTLS_ENCRYPT != ctx->operation )
         return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
 
+#if defined(MBEDTLS_GCM_C)
     if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
         return mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx, tag, tag_len );
+#endif
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
+    {
+        /* Don't allow truncated MAC for Poly1305 */
+        if ( tag_len != 16U )
+            return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+        return mbedtls_chachapoly_finish( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
+                                                      tag );
+    }
+#endif
 
     return( 0 );
 }
@@ -815,6 +908,7 @@
 int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
                       const unsigned char *tag, size_t tag_len )
 {
+    unsigned char check_tag[16];
     int ret;
 
     if( NULL == ctx || NULL == ctx->cipher_info ||
@@ -823,12 +917,9 @@
         return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
     }
 
+#if defined(MBEDTLS_GCM_C)
     if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
     {
-        unsigned char check_tag[16];
-        size_t i;
-        int diff;
-
         if( tag_len > sizeof( check_tag ) )
             return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
 
@@ -839,18 +930,38 @@
         }
 
         /* Check the tag in "constant-time" */
-        for( diff = 0, i = 0; i < tag_len; i++ )
-            diff |= tag[i] ^ check_tag[i];
-
-        if( diff != 0 )
+        if( mbedtls_constant_time_memcmp( tag, check_tag, tag_len ) != 0 )
             return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
 
         return( 0 );
     }
+#endif /* MBEDTLS_GCM_C */
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
+    {
+        /* Don't allow truncated MAC for Poly1305 */
+        if ( tag_len != sizeof( check_tag ) )
+            return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+        ret = mbedtls_chachapoly_finish( (mbedtls_chachapoly_context*) ctx->cipher_ctx,
+                                                     check_tag );
+        if ( ret != 0 )
+        {
+            return( ret );
+        }
+
+        /* Check the tag in "constant-time" */
+        if( mbedtls_constant_time_memcmp( tag, check_tag, tag_len ) != 0 )
+            return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
+
+        return( 0 );
+    }
+#endif /* MBEDTLS_CHACHAPOLY_C */
 
     return( 0 );
 }
-#endif /* MBEDTLS_GCM_C */
+#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
 
 /*
  * Packet-oriented wrapper for non-AEAD modes
@@ -909,6 +1020,22 @@
                                      tag, tag_len ) );
     }
 #endif /* MBEDTLS_CCM_C */
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
+    {
+        /* ChachaPoly has fixed length nonce and MAC (tag) */
+        if ( ( iv_len != ctx->cipher_info->iv_size ) ||
+             ( tag_len != 16U ) )
+        {
+            return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+        }
+
+        *olen = ilen;
+        return( mbedtls_chachapoly_crypt_and_tag( ctx->cipher_ctx,
+                                MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                ilen, iv, ad, ad_len, input, output, tag ) );
+    }
+#endif /* MBEDTLS_CHACHAPOLY_C */
 
     return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
 }
@@ -955,6 +1082,28 @@
         return( ret );
     }
 #endif /* MBEDTLS_CCM_C */
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type )
+    {
+        int ret;
+
+        /* ChachaPoly has fixed length nonce and MAC (tag) */
+        if ( ( iv_len != ctx->cipher_info->iv_size ) ||
+             ( tag_len != 16U ) )
+        {
+            return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+        }
+
+        *olen = ilen;
+        ret = mbedtls_chachapoly_auth_decrypt( ctx->cipher_ctx, ilen,
+                                iv, ad, ad_len, tag, input, output );
+
+        if( ret == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED )
+            ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
+
+        return( ret );
+    }
+#endif /* MBEDTLS_CHACHAPOLY_C */
 
     return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
 }
diff --git a/library/cipher_wrap.c b/library/cipher_wrap.c
index a58a5c7..0ab4971 100644
--- a/library/cipher_wrap.c
+++ b/library/cipher_wrap.c
@@ -33,6 +33,10 @@
 
 #include "mbedtls/cipher_internal.h"
 
+#if defined(MBEDTLS_CHACHAPOLY_C)
+#include "mbedtls/chachapoly.h"
+#endif
+
 #if defined(MBEDTLS_AES_C)
 #include "mbedtls/aes.h"
 #endif
@@ -53,6 +57,10 @@
 #include "mbedtls/blowfish.h"
 #endif
 
+#if defined(MBEDTLS_CHACHA20_C)
+#include "mbedtls/chacha20.h"
+#endif
+
 #if defined(MBEDTLS_GCM_C)
 #include "mbedtls/gcm.h"
 #endif
@@ -1506,6 +1514,162 @@
 };
 #endif /* MBEDTLS_ARC4_C */
 
+#if defined(MBEDTLS_CHACHA20_C)
+
+static int chacha20_setkey_wrap( void *ctx, const unsigned char *key,
+                                 unsigned int key_bitlen )
+{
+    if( key_bitlen != 256U )
+        return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+    if ( 0 != mbedtls_chacha20_setkey( (mbedtls_chacha20_context*)ctx, key ) )
+        return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+    return( 0 );
+}
+
+static int chacha20_stream_wrap( void *ctx,  size_t length,
+                                 const unsigned char *input,
+                                 unsigned char *output )
+{
+    int ret;
+
+    ret = mbedtls_chacha20_update( ctx, length, input, output );
+    if( ret == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA )
+        return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+    return( ret );
+}
+
+static void * chacha20_ctx_alloc( void )
+{
+    mbedtls_chacha20_context *ctx;
+    ctx = mbedtls_calloc( 1, sizeof( mbedtls_chacha20_context ) );
+
+    if( ctx == NULL )
+        return( NULL );
+
+    mbedtls_chacha20_init( ctx );
+
+    return( ctx );
+}
+
+static void chacha20_ctx_free( void *ctx )
+{
+    mbedtls_chacha20_free( (mbedtls_chacha20_context *) ctx );
+    mbedtls_free( ctx );
+}
+
+static const mbedtls_cipher_base_t chacha20_base_info = {
+    MBEDTLS_CIPHER_ID_CHACHA20,
+    NULL,
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_CTR)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_STREAM)
+    chacha20_stream_wrap,
+#endif
+    chacha20_setkey_wrap,
+    chacha20_setkey_wrap,
+    chacha20_ctx_alloc,
+    chacha20_ctx_free
+};
+static const mbedtls_cipher_info_t chacha20_info = {
+    MBEDTLS_CIPHER_CHACHA20,
+    MBEDTLS_MODE_STREAM,
+    256,
+    "CHACHA20",
+    12,
+    0,
+    1,
+    &chacha20_base_info
+};
+#endif /* MBEDTLS_CHACHA20_C */
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+
+static int chachapoly_setkey_wrap( void *ctx,
+                                   const unsigned char *key,
+                                   unsigned int key_bitlen )
+{
+    if( key_bitlen != 256U )
+        return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+    if ( 0 != mbedtls_chachapoly_setkey( (mbedtls_chachapoly_context*)ctx, key ) )
+        return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
+
+    return( 0 );
+}
+
+static void * chachapoly_ctx_alloc( void )
+{
+    mbedtls_chachapoly_context *ctx;
+    ctx = mbedtls_calloc( 1, sizeof( mbedtls_chachapoly_context ) );
+
+    if( ctx == NULL )
+        return( NULL );
+
+    mbedtls_chachapoly_init( ctx );
+
+    return( ctx );
+}
+
+static void chachapoly_ctx_free( void *ctx )
+{
+    mbedtls_chachapoly_free( (mbedtls_chachapoly_context *) ctx );
+    mbedtls_free( ctx );
+}
+
+static const mbedtls_cipher_base_t chachapoly_base_info = {
+    MBEDTLS_CIPHER_ID_CHACHA20,
+    NULL,
+#if defined(MBEDTLS_CIPHER_MODE_CBC)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_CFB)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_CTR)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+    NULL,
+#endif
+#if defined(MBEDTLS_CIPHER_MODE_STREAM)
+    NULL,
+#endif
+    chachapoly_setkey_wrap,
+    chachapoly_setkey_wrap,
+    chachapoly_ctx_alloc,
+    chachapoly_ctx_free
+};
+static const mbedtls_cipher_info_t chachapoly_info = {
+    MBEDTLS_CIPHER_CHACHA20_POLY1305,
+    MBEDTLS_MODE_NONE,
+    256,
+    "CHACHA20-POLY1305",
+    12,
+    0,
+    1,
+    &chachapoly_base_info
+};
+#endif /* MBEDTLS_CHACHAPOLY_C */
+
 #if defined(MBEDTLS_CIPHER_NULL_CIPHER)
 static int null_crypt_stream( void *ctx, size_t length,
                               const unsigned char *input,
@@ -1676,6 +1840,14 @@
 #endif
 #endif /* MBEDTLS_DES_C */
 
+#if defined(MBEDTLS_CHACHA20_C)
+    { MBEDTLS_CIPHER_CHACHA20,             &chacha20_info },
+#endif
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    { MBEDTLS_CIPHER_CHACHA20_POLY1305,    &chachapoly_info },
+#endif
+
 #if defined(MBEDTLS_CIPHER_NULL_CIPHER)
     { MBEDTLS_CIPHER_NULL,                 &null_cipher_info },
 #endif /* MBEDTLS_CIPHER_NULL_CIPHER */
diff --git a/library/error.c b/library/error.c
index 8dd90b2..a3deb86 100644
--- a/library/error.c
+++ b/library/error.c
@@ -69,6 +69,14 @@
 #include "mbedtls/ccm.h"
 #endif
 
+#if defined(MBEDTLS_CHACHA20_C)
+#include "mbedtls/chacha20.h"
+#endif
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+#include "mbedtls/chachapoly.h"
+#endif
+
 #if defined(MBEDTLS_CIPHER_C)
 #include "mbedtls/cipher.h"
 #endif
@@ -153,6 +161,10 @@
 #include "mbedtls/pkcs5.h"
 #endif
 
+#if defined(MBEDTLS_POLY1305_C)
+#include "mbedtls/poly1305.h"
+#endif
+
 #if defined(MBEDTLS_RIPEMD160_C)
 #include "mbedtls/ripemd160.h"
 #endif
@@ -657,6 +669,24 @@
         mbedtls_snprintf( buf, buflen, "CCM - CCM hardware accelerator failed" );
 #endif /* MBEDTLS_CCM_C */
 
+#if defined(MBEDTLS_CHACHA20_C)
+    if( use_ret == -(MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "CHACHA20 - Invalid input parameter(s)" );
+    if( use_ret == -(MBEDTLS_ERR_CHACHA20_FEATURE_UNAVAILABLE) )
+        mbedtls_snprintf( buf, buflen, "CHACHA20 - Feature not available. For example, s part of the API is not implemented" );
+#endif /* MBEDTLS_CHACHA20_C */
+
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if( use_ret == -(MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "CHACHAPOLY - Invalid input parameter(s)" );
+    if( use_ret == -(MBEDTLS_ERR_CHACHAPOLY_BAD_STATE) )
+        mbedtls_snprintf( buf, buflen, "CHACHAPOLY - The requested operation is not permitted in the current state" );
+    if( use_ret == -(MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED) )
+        mbedtls_snprintf( buf, buflen, "CHACHAPOLY - Authenticated decryption failed: data was not authentic" );
+    if( use_ret == -(MBEDTLS_ERR_CHACHAPOLY_FEATURE_UNAVAILABLE) )
+        mbedtls_snprintf( buf, buflen, "CHACHAPOLY - Feature not available. For example, s part of the API is not implemented" );
+#endif /* MBEDTLS_CHACHAPOLY_C */
+
 #if defined(MBEDTLS_CMAC_C)
     if( use_ret == -(MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED) )
         mbedtls_snprintf( buf, buflen, "CMAC - CMAC hardware accelerator failed" );
@@ -774,6 +804,13 @@
         mbedtls_snprintf( buf, buflen, "PADLOCK - Input data should be aligned" );
 #endif /* MBEDTLS_PADLOCK_C */
 
+#if defined(MBEDTLS_POLY1305_C)
+    if( use_ret == -(MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA) )
+        mbedtls_snprintf( buf, buflen, "POLY1305 - Invalid input parameter(s)" );
+    if( use_ret == -(MBEDTLS_ERR_POLY1305_FEATURE_UNAVAILABLE) )
+        mbedtls_snprintf( buf, buflen, "POLY1305 - Feature not available. For example, s part of the API is not implemented" );
+#endif /* MBEDTLS_POLY1305_C */
+
 #if defined(MBEDTLS_RIPEMD160_C)
     if( use_ret == -(MBEDTLS_ERR_RIPEMD160_HW_ACCEL_FAILED) )
         mbedtls_snprintf( buf, buflen, "RIPEMD160 - RIPEMD160 hardware accelerator failed" );
diff --git a/library/poly1305.c b/library/poly1305.c
new file mode 100644
index 0000000..a9fff47
--- /dev/null
+++ b/library/poly1305.c
@@ -0,0 +1,534 @@
+/**
+ * \file poly1305.c
+ *
+ * \brief Poly1305 authentication algorithm.
+ *
+ *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_POLY1305_C)
+
+#if !defined(MBEDTLS_POLY1305_ALT)
+
+#include "mbedtls/poly1305.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_SELF_TEST)
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdio.h>
+#define mbedtls_printf printf
+#endif /* MBEDTLS_PLATFORM_C */
+#endif /* MBEDTLS_SELF_TEST */
+
+#define POLY1305_BLOCK_SIZE_BYTES ( 16U )
+
+#define BYTES_TO_U32_LE( data, offset )                           \
+    ( (uint32_t) data[offset]                                     \
+          | (uint32_t) ( (uint32_t) data[( offset ) + 1] << 8 )   \
+          | (uint32_t) ( (uint32_t) data[( offset ) + 2] << 16 )  \
+          | (uint32_t) ( (uint32_t) data[( offset ) + 3] << 24 )  \
+    )
+
+/* Implementation that should never be optimized out by the compiler */
+static void mbedtls_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+/**
+ * \brief                   Process blocks with Poly1305.
+ *
+ * \param ctx               The Poly1305 context.
+ * \param nblocks           Number of blocks to process. Note that this function
+ *                          only processes full blocks.
+ * \param input             Buffer containing the input block(s).
+ * \param needs_padding     Set to 0 if the padding bit has already been applied
+ *                          to the input data before calling this function.
+ *                          Otherwise, set this parameter to 1.
+ */
+static void mbedtls_poly1305_process( mbedtls_poly1305_context *ctx,
+                                      size_t nblocks,
+                                      const unsigned char *input,
+                                      uint32_t needs_padding )
+{
+    uint64_t d0, d1, d2, d3;
+    uint32_t acc0, acc1, acc2, acc3, acc4;
+    uint32_t r0, r1, r2, r3;
+    uint32_t rs1, rs2, rs3;
+    size_t offset  = 0U;
+    size_t i;
+
+    r0 = ctx->r[0];
+    r1 = ctx->r[1];
+    r2 = ctx->r[2];
+    r3 = ctx->r[3];
+
+    rs1 = r1 + ( r1 >> 2U );
+    rs2 = r2 + ( r2 >> 2U );
+    rs3 = r3 + ( r3 >> 2U );
+
+    acc0 = ctx->acc[0];
+    acc1 = ctx->acc[1];
+    acc2 = ctx->acc[2];
+    acc3 = ctx->acc[3];
+    acc4 = ctx->acc[4];
+
+    /* Process full blocks */
+    for ( i = 0U; i < nblocks; i++ )
+    {
+        /* Compute: acc += block */
+        /* Note that the input block is treated as a 128-bit little-endian integer */
+        d0   = (uint64_t) acc0 + BYTES_TO_U32_LE( input, offset + 0  );
+        d1   = (uint64_t) acc1 + BYTES_TO_U32_LE( input, offset + 4  ) + ( d0 >> 32U );
+        d2   = (uint64_t) acc2 + BYTES_TO_U32_LE( input, offset + 8  ) + ( d1 >> 32U );
+        d3   = (uint64_t) acc3 + BYTES_TO_U32_LE( input, offset + 12 ) + ( d2 >> 32U );
+        acc0 = (uint32_t) d0;
+        acc1 = (uint32_t) d1;
+        acc2 = (uint32_t) d2;
+        acc3 = (uint32_t) d3;
+        acc4 += (uint32_t) ( d3 >> 32U ) + needs_padding;
+
+        /* Compute: acc *= r */
+        d0 = ( (uint64_t) acc0 * r0  ) +
+             ( (uint64_t) acc1 * rs3 ) +
+             ( (uint64_t) acc2 * rs2 ) +
+             ( (uint64_t) acc3 * rs1 );
+        d1 = ( (uint64_t) acc0 * r1  ) +
+             ( (uint64_t) acc1 * r0  ) +
+             ( (uint64_t) acc2 * rs3 ) +
+             ( (uint64_t) acc3 * rs2 ) +
+             ( (uint64_t) acc4 * rs1 );
+        d2 = ( (uint64_t) acc0 * r2  ) +
+             ( (uint64_t) acc1 * r1  ) +
+             ( (uint64_t) acc2 * r0  ) +
+             ( (uint64_t) acc3 * rs3 ) +
+             ( (uint64_t) acc4 * rs2 );
+        d3 = ( (uint64_t) acc0 * r3  ) +
+             ( (uint64_t) acc1 * r2  ) +
+             ( (uint64_t) acc2 * r1  ) +
+             ( (uint64_t) acc3 * r0  ) +
+             ( (uint64_t) acc4 * rs3 );
+        acc4 *= r0;
+
+        /* Compute: acc %= (2^130 - 5) (partial remainder) */
+        d1 += ( d0 >> 32 );
+        d2 += ( d1 >> 32 );
+        d3 += ( d2 >> 32 );
+        acc0 = (uint32_t) d0;
+        acc1 = (uint32_t) d1;
+        acc2 = (uint32_t) d2;
+        acc3 = (uint32_t) d3;
+        acc4 = (uint32_t) ( d3 >> 32 ) + acc4;
+
+        d0 = (uint64_t) acc0 + ( acc4 >> 2 ) + ( acc4 & 0xFFFFFFFCU );
+        acc4 &= 3U;
+        acc0 = (uint32_t) d0;
+        d0 = (uint64_t) acc1 + ( d0 >> 32U );
+        acc1 = (uint32_t) d0;
+        d0 = (uint64_t) acc2 + ( d0 >> 32U );
+        acc2 = (uint32_t) d0;
+        d0 = (uint64_t) acc3 + ( d0 >> 32U );
+        acc3 = (uint32_t) d0;
+        d0 = (uint64_t) acc4 + ( d0 >> 32U );
+        acc4 = (uint32_t) d0;
+
+        offset    += POLY1305_BLOCK_SIZE_BYTES;
+    }
+
+    ctx->acc[0] = acc0;
+    ctx->acc[1] = acc1;
+    ctx->acc[2] = acc2;
+    ctx->acc[3] = acc3;
+    ctx->acc[4] = acc4;
+}
+
+/**
+ * \brief                   Compute the Poly1305 MAC
+ *
+ * \param ctx               The Poly1305 context.
+ * \param mac               The buffer to where the MAC is written. Must be
+ *                          big enough to contain the 16-byte MAC.
+ */
+static void mbedtls_poly1305_compute_mac( const mbedtls_poly1305_context *ctx,
+                                          unsigned char mac[16] )
+{
+    uint64_t d;
+    uint32_t g0, g1, g2, g3, g4;
+    uint32_t acc0, acc1, acc2, acc3, acc4;
+    uint32_t mask;
+    uint32_t mask_inv;
+
+    acc0 = ctx->acc[0];
+    acc1 = ctx->acc[1];
+    acc2 = ctx->acc[2];
+    acc3 = ctx->acc[3];
+    acc4 = ctx->acc[4];
+
+    /* Before adding 's' we need to ensure that the accumulator is mod 2^130 - 5.
+     * We do this by calculating acc - (2^130 - 5), then checking if
+     * the 131st bit is set. If it is, then reduce: acc -= (2^130 - 5)
+     */
+
+    /* Calculate acc + -(2^130 - 5) */
+    d  = ( (uint64_t) acc0 + 5U );
+    g0 = (uint32_t) d;
+    d  = ( (uint64_t) acc1 + ( d >> 32 ) );
+    g1 = (uint32_t) d;
+    d  = ( (uint64_t) acc2 + ( d >> 32 ) );
+    g2 = (uint32_t) d;
+    d  = ( (uint64_t) acc3 + ( d >> 32 ) );
+    g3 = (uint32_t) d;
+    g4 = acc4 + (uint32_t) ( d >> 32U );
+
+    /* mask == 0xFFFFFFFF if 131st bit is set, otherwise mask == 0 */
+    mask = (uint32_t) 0U - ( g4 >> 2U );
+    mask_inv = ~mask;
+
+    /* If 131st bit is set then acc=g, otherwise, acc is unmodified */
+    acc0 = ( acc0 & mask_inv ) | ( g0 & mask );
+    acc1 = ( acc1 & mask_inv ) | ( g1 & mask );
+    acc2 = ( acc2 & mask_inv ) | ( g2 & mask );
+    acc3 = ( acc3 & mask_inv ) | ( g3 & mask );
+
+    /* Add 's' */
+    d = (uint64_t) acc0 + ctx->s[0];
+    acc0 = (uint32_t) d;
+    d = (uint64_t) acc1 + ctx->s[1] + ( d >> 32U );
+    acc1 = (uint32_t) d;
+    d = (uint64_t) acc2 + ctx->s[2] + ( d >> 32U );
+    acc2 = (uint32_t) d;
+    acc3 += ctx->s[3] + (uint32_t) ( d >> 32U );
+
+    /* Compute MAC (128 least significant bits of the accumulator) */
+    mac[0]  = (unsigned char) acc0;
+    mac[1]  = (unsigned char) ( acc0 >> 8  );
+    mac[2]  = (unsigned char) ( acc0 >> 16 );
+    mac[3]  = (unsigned char) ( acc0 >> 24 );
+    mac[4]  = (unsigned char) acc1;
+    mac[5]  = (unsigned char) ( acc1 >> 8  );
+    mac[6]  = (unsigned char) ( acc1 >> 16 );
+    mac[7]  = (unsigned char) ( acc1 >> 24 );
+    mac[8]  = (unsigned char) acc2;
+    mac[9]  = (unsigned char) ( acc2 >> 8  );
+    mac[10] = (unsigned char) ( acc2 >> 16 );
+    mac[11] = (unsigned char) ( acc2 >> 24 );
+    mac[12] = (unsigned char) acc3;
+    mac[13] = (unsigned char) ( acc3 >> 8  );
+    mac[14] = (unsigned char) ( acc3 >> 16 );
+    mac[15] = (unsigned char) ( acc3 >> 24 );
+}
+
+void mbedtls_poly1305_init( mbedtls_poly1305_context *ctx )
+{
+    if ( ctx != NULL )
+    {
+        mbedtls_zeroize( ctx, sizeof( mbedtls_poly1305_context ) );
+    }
+}
+
+void mbedtls_poly1305_free( mbedtls_poly1305_context *ctx )
+{
+    if ( ctx != NULL )
+    {
+        mbedtls_zeroize( ctx, sizeof( mbedtls_poly1305_context ) );
+    }
+}
+
+int mbedtls_poly1305_starts( mbedtls_poly1305_context *ctx,
+                             const unsigned char key[32] )
+{
+    if ( ctx == NULL || key == NULL )
+    {
+        return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    }
+
+    /* r &= 0x0ffffffc0ffffffc0ffffffc0fffffff */
+    ctx->r[0] = BYTES_TO_U32_LE( key, 0 )  & 0x0FFFFFFFU;
+    ctx->r[1] = BYTES_TO_U32_LE( key, 4 )  & 0x0FFFFFFCU;
+    ctx->r[2] = BYTES_TO_U32_LE( key, 8 )  & 0x0FFFFFFCU;
+    ctx->r[3] = BYTES_TO_U32_LE( key, 12 ) & 0x0FFFFFFCU;
+
+    ctx->s[0] = BYTES_TO_U32_LE( key, 16 );
+    ctx->s[1] = BYTES_TO_U32_LE( key, 20 );
+    ctx->s[2] = BYTES_TO_U32_LE( key, 24 );
+    ctx->s[3] = BYTES_TO_U32_LE( key, 28 );
+
+    /* Initial accumulator state */
+    ctx->acc[0] = 0U;
+    ctx->acc[1] = 0U;
+    ctx->acc[2] = 0U;
+    ctx->acc[3] = 0U;
+    ctx->acc[4] = 0U;
+
+    /* Queue initially empty */
+    mbedtls_zeroize( ctx->queue, sizeof( ctx->queue ) );
+    ctx->queue_len = 0U;
+
+    return( 0 );
+}
+
+int mbedtls_poly1305_update( mbedtls_poly1305_context *ctx,
+                             const unsigned char *input,
+                             size_t ilen )
+{
+    size_t offset    = 0U;
+    size_t remaining = ilen;
+    size_t queue_free_len;
+    size_t nblocks;
+
+    if ( ctx == NULL )
+    {
+        return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    }
+    else if ( ( ilen > 0U ) && ( input == NULL ) )
+    {
+        /* input pointer is allowed to be NULL only if ilen == 0 */
+        return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    }
+
+    if ( ( remaining > 0U ) && ( ctx->queue_len > 0U ) )
+    {
+        queue_free_len = ( POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );
+
+        if ( ilen < queue_free_len )
+        {
+            /* Not enough data to complete the block.
+             * Store this data with the other leftovers.
+             */
+            memcpy( &ctx->queue[ctx->queue_len],
+                    input,
+                    ilen );
+
+            ctx->queue_len += ilen;
+
+            remaining = 0U;
+        }
+        else
+        {
+            /* Enough data to produce a complete block */
+            memcpy( &ctx->queue[ctx->queue_len],
+                    input,
+                    queue_free_len );
+
+            ctx->queue_len = 0U;
+
+            mbedtls_poly1305_process( ctx,
+                                      1U,
+                                      ctx->queue,
+                                      1U ); /* add padding bit */
+
+            offset    += queue_free_len;
+            remaining -= queue_free_len;
+        }
+    }
+
+    if ( remaining >= POLY1305_BLOCK_SIZE_BYTES )
+    {
+        nblocks = remaining / POLY1305_BLOCK_SIZE_BYTES;
+
+        mbedtls_poly1305_process( ctx, nblocks, &input[offset], 1U );
+
+        offset += nblocks * POLY1305_BLOCK_SIZE_BYTES;
+        remaining %= POLY1305_BLOCK_SIZE_BYTES;
+    }
+
+    if ( remaining > 0U )
+    {
+        /* Store partial block */
+        ctx->queue_len = remaining;
+        memcpy( ctx->queue, &input[offset], remaining );
+    }
+
+    return( 0 );
+}
+
+int mbedtls_poly1305_finish( mbedtls_poly1305_context *ctx,
+                             unsigned char mac[16] )
+{
+    if ( ( ctx == NULL ) || ( mac == NULL ) )
+    {
+        return( MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    }
+
+    /* Process any leftover data */
+    if ( ctx->queue_len > 0U )
+    {
+        /* Add padding bit */
+        ctx->queue[ctx->queue_len] = 1U;
+        ctx->queue_len++;
+
+        /* Pad with zeroes */
+        memset( &ctx->queue[ctx->queue_len],
+                0,
+                POLY1305_BLOCK_SIZE_BYTES - ctx->queue_len );
+
+        mbedtls_poly1305_process( ctx,
+                                  1U,           /* Process 1 block */
+                                  ctx->queue,
+                                  0U );         /* Don't add padding bit (it was just added above) */
+    }
+
+    mbedtls_poly1305_compute_mac( ctx, mac );
+
+    return( 0 );
+}
+
+int mbedtls_poly1305_mac( const unsigned char key[32],
+                          const unsigned char *input,
+                          size_t ilen,
+                          unsigned char mac[16] )
+{
+    mbedtls_poly1305_context ctx;
+    int result;
+
+    mbedtls_poly1305_init( &ctx );
+
+    result = mbedtls_poly1305_starts( &ctx, key );
+    if ( result != 0 )
+        goto cleanup;
+
+    result = mbedtls_poly1305_update( &ctx, input, ilen );
+    if ( result != 0 )
+        goto cleanup;
+
+    result = mbedtls_poly1305_finish( &ctx, mac );
+
+cleanup:
+    mbedtls_poly1305_free( &ctx );
+    return( result );
+}
+
+#endif /* MBEDTLS_POLY1305_ALT */
+
+#if defined(MBEDTLS_SELF_TEST)
+
+static const unsigned char test_keys[2][32] =
+{
+    {
+        0x85, 0xd6, 0xbe, 0x78, 0x57, 0x55, 0x6d, 0x33,
+        0x7f, 0x44, 0x52, 0xfe, 0x42, 0xd5, 0x06, 0xa8,
+        0x01, 0x03, 0x80, 0x8a, 0xfb, 0x0d, 0xb2, 0xfd,
+        0x4a, 0xbf, 0xf6, 0xaf, 0x41, 0x49, 0xf5, 0x1b
+    },
+    {
+        0x1c, 0x92, 0x40, 0xa5, 0xeb, 0x55, 0xd3, 0x8a,
+        0xf3, 0x33, 0x88, 0x86, 0x04, 0xf6, 0xb5, 0xf0,
+        0x47, 0x39, 0x17, 0xc1, 0x40, 0x2b, 0x80, 0x09,
+        0x9d, 0xca, 0x5c, 0xbc, 0x20, 0x70, 0x75, 0xc0
+    }
+};
+
+static const unsigned char test_data[2][127] =
+{
+    {
+        0x43, 0x72, 0x79, 0x70, 0x74, 0x6f, 0x67, 0x72,
+        0x61, 0x70, 0x68, 0x69, 0x63, 0x20, 0x46, 0x6f,
+        0x72, 0x75, 0x6d, 0x20, 0x52, 0x65, 0x73, 0x65,
+        0x61, 0x72, 0x63, 0x68, 0x20, 0x47, 0x72, 0x6f,
+        0x75, 0x70
+    },
+    {
+        0x27, 0x54, 0x77, 0x61, 0x73, 0x20, 0x62, 0x72,
+        0x69, 0x6c, 0x6c, 0x69, 0x67, 0x2c, 0x20, 0x61,
+        0x6e, 0x64, 0x20, 0x74, 0x68, 0x65, 0x20, 0x73,
+        0x6c, 0x69, 0x74, 0x68, 0x79, 0x20, 0x74, 0x6f,
+        0x76, 0x65, 0x73, 0x0a, 0x44, 0x69, 0x64, 0x20,
+        0x67, 0x79, 0x72, 0x65, 0x20, 0x61, 0x6e, 0x64,
+        0x20, 0x67, 0x69, 0x6d, 0x62, 0x6c, 0x65, 0x20,
+        0x69, 0x6e, 0x20, 0x74, 0x68, 0x65, 0x20, 0x77,
+        0x61, 0x62, 0x65, 0x3a, 0x0a, 0x41, 0x6c, 0x6c,
+        0x20, 0x6d, 0x69, 0x6d, 0x73, 0x79, 0x20, 0x77,
+        0x65, 0x72, 0x65, 0x20, 0x74, 0x68, 0x65, 0x20,
+        0x62, 0x6f, 0x72, 0x6f, 0x67, 0x6f, 0x76, 0x65,
+        0x73, 0x2c, 0x0a, 0x41, 0x6e, 0x64, 0x20, 0x74,
+        0x68, 0x65, 0x20, 0x6d, 0x6f, 0x6d, 0x65, 0x20,
+        0x72, 0x61, 0x74, 0x68, 0x73, 0x20, 0x6f, 0x75,
+        0x74, 0x67, 0x72, 0x61, 0x62, 0x65, 0x2e
+    }
+};
+
+static const size_t test_data_len[2] =
+{
+    34U,
+    127U
+};
+
+static const unsigned char test_mac[2][16] =
+{
+    {
+        0xa8, 0x06, 0x1d, 0xc1, 0x30, 0x51, 0x36, 0xc6,
+        0xc2, 0x2b, 0x8b, 0xaf, 0x0c, 0x01, 0x27, 0xa9
+    },
+    {
+        0x45, 0x41, 0x66, 0x9a, 0x7e, 0xaa, 0xee, 0x61,
+        0xe7, 0x08, 0xdc, 0x7c, 0xbc, 0xc5, 0xeb, 0x62
+    }
+};
+
+#define ASSERT( cond, args )            \
+    do                                  \
+    {                                   \
+        if( ! ( cond ) )                \
+        {                               \
+            if( verbose != 0 )          \
+                mbedtls_printf args;    \
+                                        \
+            return( -1 );               \
+        }                               \
+    }                                   \
+    while( 0 )
+
+int mbedtls_poly1305_self_test( int verbose )
+{
+    unsigned char mac[16];
+    unsigned i;
+    int result;
+
+    for( i = 0U; i < 2U; i++ )
+    {
+        if( verbose != 0 )
+            mbedtls_printf( "  Poly1305 test %u ", i );
+
+        result = mbedtls_poly1305_mac( test_keys[i],
+                                       test_data[i],
+                                       test_data_len[i],
+                                       mac );
+        ASSERT( 0 == result, ( "error code: %i\n", result ) );
+
+        ASSERT( 0 == memcmp( mac, test_mac[i], 16U ), ( "failed (mac)\n" ) );
+
+        if( verbose != 0 )
+            mbedtls_printf( "passed\n" );
+    }
+
+    if( verbose != 0 )
+        mbedtls_printf( "\n" );
+
+    return( 0 );
+}
+
+#endif /* MBEDTLS_SELF_TEST */
+
+#endif /* MBEDTLS_POLY1305_C */
diff --git a/library/version_features.c b/library/version_features.c
index 82b8dd0..89eb501 100644
--- a/library/version_features.c
+++ b/library/version_features.c
@@ -84,6 +84,9 @@
 #if defined(MBEDTLS_TIMING_ALT)
     "MBEDTLS_TIMING_ALT",
 #endif /* MBEDTLS_TIMING_ALT */
+#if defined(MBEDTLS_CHACHAPOLY_ALT)
+    "MBEDTLS_CHACHAPOLY_ALT",
+#endif /* MBEDTLS_CHACHAPOLY_ALT */
 #if defined(MBEDTLS_AES_ALT)
     "MBEDTLS_AES_ALT",
 #endif /* MBEDTLS_AES_ALT */
@@ -99,6 +102,9 @@
 #if defined(MBEDTLS_CCM_ALT)
     "MBEDTLS_CCM_ALT",
 #endif /* MBEDTLS_CCM_ALT */
+#if defined(MBEDTLS_CHACHA20_ALT)
+    "MBEDTLS_CHACHA20_ALT",
+#endif /* MBEDTLS_CHACHA20_ALT */
 #if defined(MBEDTLS_CMAC_ALT)
     "MBEDTLS_CMAC_ALT",
 #endif /* MBEDTLS_CMAC_ALT */
@@ -123,6 +129,9 @@
 #if defined(MBEDTLS_MD5_ALT)
     "MBEDTLS_MD5_ALT",
 #endif /* MBEDTLS_MD5_ALT */
+#if defined(MBEDTLS_POLY1305_ALT)
+    "MBEDTLS_POLY1305_ALT",
+#endif /* MBEDTLS_POLY1305_ALT */
 #if defined(MBEDTLS_RIPEMD160_ALT)
     "MBEDTLS_RIPEMD160_ALT",
 #endif /* MBEDTLS_RIPEMD160_ALT */
@@ -516,6 +525,9 @@
 #if defined(MBEDTLS_AES_C)
     "MBEDTLS_AES_C",
 #endif /* MBEDTLS_AES_C */
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    "MBEDTLS_CHACHAPOLY_C",
+#endif /* MBEDTLS_CHACHAPOLY_C */
 #if defined(MBEDTLS_ARC4_C)
     "MBEDTLS_ARC4_C",
 #endif /* MBEDTLS_ARC4_C */
@@ -537,12 +549,18 @@
 #if defined(MBEDTLS_CAMELLIA_C)
     "MBEDTLS_CAMELLIA_C",
 #endif /* MBEDTLS_CAMELLIA_C */
+#if defined(MBEDTLS_CHACHA20_C)
+    "MBEDTLS_CHACHA20_C",
+#endif /* MBEDTLS_CHACHA20_C */
 #if defined(MBEDTLS_CCM_C)
     "MBEDTLS_CCM_C",
 #endif /* MBEDTLS_CCM_C */
 #if defined(MBEDTLS_CERTS_C)
     "MBEDTLS_CERTS_C",
 #endif /* MBEDTLS_CERTS_C */
+#if defined(MBEDTLS_CHACHA20_C)
+    "MBEDTLS_CHACHA20_C",
+#endif /* MBEDTLS_CHACHA20_C */
 #if defined(MBEDTLS_CIPHER_C)
     "MBEDTLS_CIPHER_C",
 #endif /* MBEDTLS_CIPHER_C */
@@ -642,6 +660,9 @@
 #if defined(MBEDTLS_PLATFORM_C)
     "MBEDTLS_PLATFORM_C",
 #endif /* MBEDTLS_PLATFORM_C */
+#if defined(MBEDTLS_POLY1305_C)
+    "MBEDTLS_POLY1305_C",
+#endif /* MBEDTLS_POLY1305_C */
 #if defined(MBEDTLS_RIPEMD160_C)
     "MBEDTLS_RIPEMD160_C",
 #endif /* MBEDTLS_RIPEMD160_C */
diff --git a/programs/test/benchmark.c b/programs/test/benchmark.c
index 0366f9c..98d231a 100644
--- a/programs/test/benchmark.c
+++ b/programs/test/benchmark.c
@@ -59,9 +59,12 @@
 #include "mbedtls/aes.h"
 #include "mbedtls/blowfish.h"
 #include "mbedtls/camellia.h"
+#include "mbedtls/chacha20.h"
 #include "mbedtls/gcm.h"
 #include "mbedtls/ccm.h"
+#include "mbedtls/chachapoly.h"
 #include "mbedtls/cmac.h"
+#include "mbedtls/poly1305.h"
 #include "mbedtls/havege.h"
 #include "mbedtls/ctr_drbg.h"
 #include "mbedtls/hmac_drbg.h"
@@ -93,8 +96,9 @@
 
 #define OPTIONS                                                         \
     "md4, md5, ripemd160, sha1, sha256, sha512,\n"                      \
-    "arc4, des3, des, camellia, blowfish,\n"                            \
+    "arc4, des3, des, camellia, blowfish, chacha20,\n"                  \
     "aes_cbc, aes_gcm, aes_ccm, aes_cmac, aes_xts, des3_cmac,\n"        \
+    "chachapoly, poly1305\n"                                            \
     "havege, ctr_drbg, hmac_drbg\n"                                     \
     "rsa, dhm, ecdsa, ecdh.\n"
 
@@ -228,8 +232,10 @@
 typedef struct {
     char md4, md5, ripemd160, sha1, sha256, sha512,
          arc4, des3, des,
-         aes_cbc, aes_gcm, aes_ccm, aes_cmac, aes_xts, des3_cmac,
          camellia, blowfish,
+         chacha20,
+         aes_cbc, aes_gcm, aes_ccm, aes_cmac, aes_xts, des3_cmac,
+         chachapoly, poly1305,
          havege, ctr_drbg, hmac_drbg,
          rsa, dhm, ecdsa, ecdh;
 } todo_list;
@@ -278,6 +284,8 @@
                 todo.aes_gcm = 1;
             else if( strcmp( argv[i], "aes_ccm" ) == 0 )
                 todo.aes_ccm = 1;
+            else if( strcmp( argv[i], "chachapoly" ) == 0 )
+                todo.chachapoly = 1;
             else if( strcmp( argv[i], "aes_cmac" ) == 0 )
                 todo.aes_cmac = 1;
             else if( strcmp( argv[i], "aes_xts" ) == 0 )
@@ -288,6 +296,10 @@
                 todo.camellia = 1;
             else if( strcmp( argv[i], "blowfish" ) == 0 )
                 todo.blowfish = 1;
+            else if( strcmp( argv[i], "chacha20" ) == 0 )
+                todo.chacha20 = 1;
+            else if( strcmp( argv[i], "poly1305" ) == 0 )
+                todo.poly1305 = 1;
             else if( strcmp( argv[i], "havege" ) == 0 )
                 todo.havege = 1;
             else if( strcmp( argv[i], "ctr_drbg" ) == 0 )
@@ -467,6 +479,27 @@
         }
     }
 #endif
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    if( todo.chachapoly )
+    {
+        mbedtls_chachapoly_context chachapoly;
+
+        mbedtls_chachapoly_init( &chachapoly );
+        memset( buf, 0, sizeof( buf ) );
+        memset( tmp, 0, sizeof( tmp ) );
+
+        mbedtls_snprintf( title, sizeof( title ), "ChaCha20-Poly1305" );
+
+        mbedtls_chachapoly_setkey( &chachapoly, tmp );
+
+        TIME_AND_TSC( title,
+                mbedtls_chachapoly_crypt_and_tag( &chachapoly,
+                    MBEDTLS_CHACHAPOLY_ENCRYPT, BUFSIZE, tmp,
+                    NULL, 0, buf, buf, tmp ) );
+
+        mbedtls_chachapoly_free( &chachapoly );
+    }
+#endif
 #if defined(MBEDTLS_CMAC_C)
     if( todo.aes_cmac )
     {
@@ -545,6 +578,20 @@
     }
 #endif
 
+#if defined(MBEDTLS_CHACHA20_C)
+    if ( todo.chacha20 )
+    {
+        TIME_AND_TSC( "ChaCha20", mbedtls_chacha20_crypt( buf, buf, 0U, BUFSIZE, buf, buf ) );
+    }
+#endif
+
+#if defined(MBEDTLS_POLY1305_C)
+    if ( todo.poly1305 )
+    {
+        TIME_AND_TSC( "Poly1305", mbedtls_poly1305_mac( buf, buf, BUFSIZE, buf ) );
+    }
+#endif
+
 #if defined(MBEDTLS_BLOWFISH_C) && defined(MBEDTLS_CIPHER_MODE_CBC)
     if( todo.blowfish )
     {
diff --git a/programs/test/selftest.c b/programs/test/selftest.c
index 72a3734..13fa98c 100644
--- a/programs/test/selftest.c
+++ b/programs/test/selftest.c
@@ -44,6 +44,9 @@
 #include "mbedtls/des.h"
 #include "mbedtls/aes.h"
 #include "mbedtls/camellia.h"
+#include "mbedtls/chacha20.h"
+#include "mbedtls/poly1305.h"
+#include "mbedtls/chachapoly.h"
 #include "mbedtls/base64.h"
 #include "mbedtls/bignum.h"
 #include "mbedtls/rsa.h"
@@ -207,6 +210,15 @@
 #if defined(MBEDTLS_CMAC_C)
     {"cmac", mbedtls_cmac_self_test},
 #endif
+#if defined(MBEDTLS_CHACHA20_C)
+    {"chacha20", mbedtls_chacha20_self_test},
+#endif
+#if defined(MBEDTLS_POLY1305_C)
+    {"poly1305", mbedtls_poly1305_self_test},
+#endif
+#if defined(MBEDTLS_CHACHAPOLY_C)
+    {"chacha20-poly1305", mbedtls_chachapoly_self_test},
+#endif
 #if defined(MBEDTLS_BASE64_C)
     {"base64", mbedtls_base64_self_test},
 #endif
diff --git a/scripts/generate_errors.pl b/scripts/generate_errors.pl
index 7290b87..d064889 100755
--- a/scripts/generate_errors.pl
+++ b/scripts/generate_errors.pl
@@ -30,9 +30,9 @@
 my $error_format_file = $data_dir.'/error.fmt';
 
 my @low_level_modules = qw( AES ARC4 ASN1 BASE64 BIGNUM BLOWFISH
-                            CAMELLIA CCM CMAC CTR_DRBG DES
+                            CAMELLIA CCM CHACHA20 CHACHAPOLY CMAC CTR_DRBG DES
                             ENTROPY GCM HKDF HMAC_DRBG MD2 MD4 MD5
-                            NET OID PADLOCK PBKDF2 RIPEMD160
+                            NET OID PADLOCK PBKDF2 POLY1305 RIPEMD160
                             SHA1 SHA256 SHA512 THREADING XTEA );
 my @high_level_modules = qw( CIPHER DHM ECP MD
                              PEM PK PKCS12 PKCS5
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index bcd97a0..66d60a9 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -54,11 +54,15 @@
 add_test_suite(blowfish)
 add_test_suite(camellia)
 add_test_suite(ccm)
+add_test_suite(chacha20)
+add_test_suite(chachapoly)
 add_test_suite(cipher cipher.aes)
 add_test_suite(cipher cipher.arc4)
 add_test_suite(cipher cipher.blowfish)
 add_test_suite(cipher cipher.camellia)
 add_test_suite(cipher cipher.ccm)
+add_test_suite(cipher cipher.chacha20)
+add_test_suite(cipher cipher.chachapoly)
 add_test_suite(cipher cipher.des)
 add_test_suite(cipher cipher.gcm)
 add_test_suite(cipher cipher.null)
@@ -97,6 +101,7 @@
 add_test_suite(pk)
 add_test_suite(pkparse)
 add_test_suite(pkwrite)
+add_test_suite(poly1305)
 add_test_suite(shax)
 add_test_suite(ssl)
 add_test_suite(timing)
diff --git a/tests/Makefile b/tests/Makefile
index f34ae19..e47dbaa 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -52,9 +52,12 @@
 	test_suite_arc4$(EXEXT)		test_suite_asn1write$(EXEXT)	\
 	test_suite_base64$(EXEXT)	test_suite_blowfish$(EXEXT)	\
 	test_suite_camellia$(EXEXT)	test_suite_ccm$(EXEXT)		\
+	test_suite_chacha20$(EXEXT)	test_suite_chachapoly$(EXEXT)	\
 	test_suite_cmac$(EXEXT)						\
+	test_suite_cipher.chachapoly$(EXEXT)				\
 	test_suite_cipher.aes$(EXEXT)					\
 	test_suite_cipher.arc4$(EXEXT)	test_suite_cipher.ccm$(EXEXT)	\
+	test_suite_cipher.chacha20$(EXEXT)				\
 	test_suite_cipher.gcm$(EXEXT)					\
 	test_suite_cipher.blowfish$(EXEXT)				\
 	test_suite_cipher.camellia$(EXEXT)				\
@@ -84,6 +87,7 @@
 	test_suite_pkcs1_v21$(EXEXT)	test_suite_pkcs5$(EXEXT)	\
 	test_suite_pkparse$(EXEXT)	test_suite_pkwrite$(EXEXT)	\
 	test_suite_pk$(EXEXT)						\
+	test_suite_poly1305$(EXEXT)					\
 	test_suite_rsa$(EXEXT)		test_suite_shax$(EXEXT)		\
 	test_suite_ssl$(EXEXT)		test_suite_timing$(EXEXT)			\
 	test_suite_x509parse$(EXEXT)	test_suite_x509write$(EXEXT)	\
@@ -136,6 +140,14 @@
 	echo "  Gen   $@"
 	perl scripts/generate_code.pl suites test_suite_cipher test_suite_cipher.ccm
 
+test_suite_cipher.chacha20.c : suites/test_suite_cipher.function suites/test_suite_cipher.chacha20.data scripts/generate_code.pl suites/helpers.function suites/main_test.function
+	echo "  Gen   $@"
+	perl scripts/generate_code.pl suites test_suite_cipher test_suite_cipher.chacha20
+
+test_suite_cipher.chachapoly.c : suites/test_suite_cipher.function suites/test_suite_cipher.chachapoly.data scripts/generate_code.pl suites/helpers.function suites/main_test.function
+	echo "  Gen   $@"
+	perl scripts/generate_code.pl suites test_suite_cipher test_suite_cipher.chachapoly
+
 test_suite_cipher.gcm.c : suites/test_suite_cipher.function suites/test_suite_cipher.gcm.data scripts/generate_code.pl suites/helpers.function suites/main_test.function
 	echo "  Gen   $@"
 	perl scripts/generate_code.pl suites test_suite_cipher test_suite_cipher.gcm
@@ -212,6 +224,7 @@
 	echo "  Gen   $@"
 	perl scripts/generate_code.pl suites $* $*
 
+
 test_suite_aes.ecb$(EXEXT): test_suite_aes.ecb.c $(DEP)
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
@@ -260,6 +273,14 @@
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
+test_suite_chacha20$(EXEXT): test_suite_chacha20.c $(DEP)
+	echo "  CC    $<"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+
+test_suite_chachapoly$(EXEXT): test_suite_chachapoly.c $(DEP)
+	echo "  CC    $<"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+
 test_suite_cmac$(EXEXT): test_suite_cmac.c $(DEP)
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
@@ -276,6 +297,14 @@
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
+test_suite_cipher.chacha20$(EXEXT): test_suite_cipher.chacha20.c $(DEP)
+	echo "  CC    $<"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+
+test_suite_cipher.chachapoly$(EXEXT): test_suite_cipher.chachapoly.c $(DEP)
+	echo "  CC    $<"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+
 test_suite_cipher.gcm$(EXEXT): test_suite_cipher.gcm.c $(DEP)
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
@@ -428,6 +457,10 @@
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
 
+test_suite_poly1305$(EXEXT): test_suite_poly1305.c $(DEP)
+	echo "  CC    $<"
+	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
+
 test_suite_rsa$(EXEXT): test_suite_rsa.c $(DEP)
 	echo "  CC    $<"
 	$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $<	$(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
diff --git a/tests/suites/test_suite_chacha20.data b/tests/suites/test_suite_chacha20.data
new file mode 100644
index 0000000..3f9033e
--- /dev/null
+++ b/tests/suites/test_suite_chacha20.data
@@ -0,0 +1,29 @@
+ChaCha20 RFC 7539 Example and Test Vector (Encrypt)
+chacha20_crypt:"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f":"000000000000004a00000000":1:"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"6e2e359a2568f98041ba0728dd0d6981e97e7aec1d4360c20a27afccfd9fae0bf91b65c5524733ab8f593dabcd62b3571639d624e65152ab8f530c359f0861d807ca0dbf500d6a6156a38e088a22b65e52bc514d16ccf806818ce91ab77937365af90bbf74a35be6b40b8eedf2785e42874d"
+
+ChaCha20 RFC 7539 Example and Test Vector (Decrypt)
+chacha20_crypt:"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f":"000000000000004a00000000":1:"6e2e359a2568f98041ba0728dd0d6981e97e7aec1d4360c20a27afccfd9fae0bf91b65c5524733ab8f593dabcd62b3571639d624e65152ab8f530c359f0861d807ca0dbf500d6a6156a38e088a22b65e52bc514d16ccf806818ce91ab77937365af90bbf74a35be6b40b8eedf2785e42874d":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e"
+
+ChaCha20 RFC 7539 Test Vector #1 (Encrypt)
+chacha20_crypt:"0000000000000000000000000000000000000000000000000000000000000000":"000000000000000000000000":0:"00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000":"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11cc387b669b2ee6586"
+
+ChaCha20 RFC 7539 Test Vector #1 (Decrypt)
+chacha20_crypt:"0000000000000000000000000000000000000000000000000000000000000000":"000000000000000000000000":0:"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11cc387b669b2ee6586":"00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+
+ChaCha20 RFC 7539 Test Vector #2 (Encrypt)
+chacha20_crypt:"0000000000000000000000000000000000000000000000000000000000000001":"000000000000000000000002":1:"416e79207375626d697373696f6e20746f20746865204945544620696e74656e6465642062792074686520436f6e7472696275746f7220666f72207075626c69636174696f6e20617320616c6c206f722070617274206f6620616e204945544620496e7465726e65742d4472616674206f722052464320616e6420616e792073746174656d656e74206d6164652077697468696e2074686520636f6e74657874206f6620616e204945544620616374697669747920697320636f6e7369646572656420616e20224945544620436f6e747269627574696f6e222e20537563682073746174656d656e747320696e636c756465206f72616c2073746174656d656e747320696e20494554462073657373696f6e732c2061732077656c6c206173207772697474656e20616e6420656c656374726f6e696320636f6d6d756e69636174696f6e73206d61646520617420616e792074696d65206f7220706c6163652c207768696368206172652061646472657373656420746f":"a3fbf07df3fa2fde4f376ca23e82737041605d9f4f4f57bd8cff2c1d4b7955ec2a97948bd3722915c8f3d337f7d370050e9e96d647b7c39f56e031ca5eb6250d4042e02785ececfa4b4bb5e8ead0440e20b6e8db09d881a7c6132f420e52795042bdfa7773d8a9051447b3291ce1411c680465552aa6c405b7764d5e87bea85ad00f8449ed8f72d0d662ab052691ca66424bc86d2df80ea41f43abf937d3259dc4b2d0dfb48a6c9139ddd7f76966e928e635553ba76c5c879d7b35d49eb2e62b0871cdac638939e25e8a1e0ef9d5280fa8ca328b351c3c765989cbcf3daa8b6ccc3aaf9f3979c92b3720fc88dc95ed84a1be059c6499b9fda236e7e818b04b0bc39c1e876b193bfe5569753f88128cc08aaa9b63d1a16f80ef2554d7189c411f5869ca52c5b83fa36ff216b9c1d30062bebcfd2dc5bce0911934fda79a86f6e698ced759c3ff9b6477338f3da4f9cd8514ea9982ccafb341b2384dd902f3d1ab7ac61dd29c6f21ba5b862f3730e37cfdc4fd806c22f221"
+
+ChaCha20 RFC 7539 Test Vector #2 (Decrypt)
+chacha20_crypt:"0000000000000000000000000000000000000000000000000000000000000001":"000000000000000000000002":1:"a3fbf07df3fa2fde4f376ca23e82737041605d9f4f4f57bd8cff2c1d4b7955ec2a97948bd3722915c8f3d337f7d370050e9e96d647b7c39f56e031ca5eb6250d4042e02785ececfa4b4bb5e8ead0440e20b6e8db09d881a7c6132f420e52795042bdfa7773d8a9051447b3291ce1411c680465552aa6c405b7764d5e87bea85ad00f8449ed8f72d0d662ab052691ca66424bc86d2df80ea41f43abf937d3259dc4b2d0dfb48a6c9139ddd7f76966e928e635553ba76c5c879d7b35d49eb2e62b0871cdac638939e25e8a1e0ef9d5280fa8ca328b351c3c765989cbcf3daa8b6ccc3aaf9f3979c92b3720fc88dc95ed84a1be059c6499b9fda236e7e818b04b0bc39c1e876b193bfe5569753f88128cc08aaa9b63d1a16f80ef2554d7189c411f5869ca52c5b83fa36ff216b9c1d30062bebcfd2dc5bce0911934fda79a86f6e698ced759c3ff9b6477338f3da4f9cd8514ea9982ccafb341b2384dd902f3d1ab7ac61dd29c6f21ba5b862f3730e37cfdc4fd806c22f221":"416e79207375626d697373696f6e20746f20746865204945544620696e74656e6465642062792074686520436f6e7472696275746f7220666f72207075626c69636174696f6e20617320616c6c206f722070617274206f6620616e204945544620496e7465726e65742d4472616674206f722052464320616e6420616e792073746174656d656e74206d6164652077697468696e2074686520636f6e74657874206f6620616e204945544620616374697669747920697320636f6e7369646572656420616e20224945544620436f6e747269627574696f6e222e20537563682073746174656d656e747320696e636c756465206f72616c2073746174656d656e747320696e20494554462073657373696f6e732c2061732077656c6c206173207772697474656e20616e6420656c656374726f6e696320636f6d6d756e69636174696f6e73206d61646520617420616e792074696d65206f7220706c6163652c207768696368206172652061646472657373656420746f"
+
+ChaCha20 RFC 7539 Test Vector #3 (Encrypt)
+chacha20_crypt:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000000000000000002":42:"2754776173206272696c6c69672c20616e642074686520736c6974687920746f7665730a446964206779726520616e642067696d626c6520696e2074686520776162653a0a416c6c206d696d737920776572652074686520626f726f676f7665732c0a416e6420746865206d6f6d65207261746873206f757467726162652e":"62e6347f95ed87a45ffae7426f27a1df5fb69110044c0d73118effa95b01e5cf166d3df2d721caf9b21e5fb14c616871fd84c54f9d65b283196c7fe4f60553ebf39c6402c42234e32a356b3e764312a61a5532055716ead6962568f87d3f3f7704c6a8d1bcd1bf4d50d6154b6da731b187b58dfd728afa36757a797ac188d1"
+
+ChaCha20 RFC 7539 Test Vector #3 (Decrypt)
+chacha20_crypt:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000000000000000002":42:"62e6347f95ed87a45ffae7426f27a1df5fb69110044c0d73118effa95b01e5cf166d3df2d721caf9b21e5fb14c616871fd84c54f9d65b283196c7fe4f60553ebf39c6402c42234e32a356b3e764312a61a5532055716ead6962568f87d3f3f7704c6a8d1bcd1bf4d50d6154b6da731b187b58dfd728afa36757a797ac188d1":"2754776173206272696c6c69672c20616e642074686520736c6974687920746f7665730a446964206779726520616e642067696d626c6520696e2074686520776162653a0a416c6c206d696d737920776572652074686520626f726f676f7665732c0a416e6420746865206d6f6d65207261746873206f757467726162652e"
+
+ChaCha20 Paremeter Validation
+chacha20_bad_params:
+
+ChaCha20 Selftest
+chacha20_self_test:
diff --git a/tests/suites/test_suite_chacha20.function b/tests/suites/test_suite_chacha20.function
new file mode 100644
index 0000000..669d91e
--- /dev/null
+++ b/tests/suites/test_suite_chacha20.function
@@ -0,0 +1,140 @@
+/* BEGIN_HEADER */
+#include "mbedtls/chacha20.h"
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_CHACHA20_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void chacha20_crypt( char *hex_key_string,
+                     char *hex_nonce_string,
+                     int counter,
+                     char *hex_src_string,
+                     char *hex_dst_string )
+{
+    unsigned char key_str[32]; /* size set by the standard */
+    unsigned char nonce_str[12]; /* size set by the standard */
+    unsigned char src_str[375]; /* max size of binary input */
+    unsigned char dst_str[751]; /* hex expansion of the above */
+    unsigned char output[751];
+    size_t key_len;
+    size_t nonce_len;
+    size_t src_len;
+    size_t dst_len;
+    mbedtls_chacha20_context ctx;
+
+    memset( key_str,    0x00, sizeof( key_str ) );
+    memset( nonce_str,  0x00, sizeof( nonce_str ) );
+    memset( src_str,    0x00, sizeof( src_str ) );
+    memset( dst_str,    0x00, sizeof( dst_str ) );
+    memset( output,     0x00, sizeof( output ) );
+
+    key_len   = unhexify( key_str, hex_key_string );
+    nonce_len = unhexify( nonce_str, hex_nonce_string );
+    src_len   = unhexify( src_str, hex_src_string );
+    dst_len   = unhexify( dst_str, hex_dst_string );
+
+    TEST_ASSERT( src_len   == dst_len );
+    TEST_ASSERT( key_len   == 32U );
+    TEST_ASSERT( nonce_len == 12U );
+
+    /*
+     * Test the integrated API
+     */
+    TEST_ASSERT( mbedtls_chacha20_crypt( key_str, nonce_str, counter, src_len, src_str, output ) == 0 );
+
+    hexify( dst_str, output, src_len );
+    TEST_ASSERT( strcmp( (char*) dst_str, hex_dst_string ) == 0 );
+
+    /*
+     * Test the streaming API
+     */
+    mbedtls_chacha20_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chacha20_setkey( &ctx, key_str ) == 0 );
+
+    TEST_ASSERT( mbedtls_chacha20_starts( &ctx, nonce_str, counter ) == 0 );
+
+    memset( output, 0x00, sizeof( output ) );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, src_len, src_str, output ) == 0 );
+
+    hexify( dst_str, output, src_len );
+    TEST_ASSERT( strcmp( (char*) dst_str, hex_dst_string ) == 0 );
+
+    /*
+     * Test the streaming API again, piecewise
+     */
+
+    /* Don't free/init the context nor set the key again,
+     * in order to test that starts() does the right thing. */
+    TEST_ASSERT( mbedtls_chacha20_starts( &ctx, nonce_str, counter ) == 0 );
+
+    memset( output, 0x00, sizeof( output ) );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, 1, src_str, output ) == 0 );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, src_len - 1, src_str + 1, output + 1 ) == 0 );
+
+    hexify( dst_str, output, src_len );
+    TEST_ASSERT( strcmp( (char*) dst_str, hex_dst_string ) == 0 );
+
+    mbedtls_chacha20_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void chacha20_bad_params()
+{
+    unsigned char key[32];
+    unsigned char nonce[12];
+    unsigned char src[1];
+    unsigned char dst[1];
+    uint32_t counter = 0;
+    size_t len = sizeof( src );
+    mbedtls_chacha20_context ctx;
+
+    mbedtls_chacha20_init( NULL );
+    mbedtls_chacha20_free( NULL );
+
+    mbedtls_chacha20_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chacha20_setkey( NULL, key )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_setkey( &ctx, NULL )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chacha20_starts( NULL, nonce, counter )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_starts( &ctx, NULL, counter )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chacha20_update( NULL, 0, src, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, len, NULL, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, len, src, NULL )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_update( &ctx, 0, NULL, NULL )
+                 == 0 );
+
+    mbedtls_chacha20_free( &ctx );
+
+    TEST_ASSERT( mbedtls_chacha20_crypt( NULL, nonce, counter, 0, src, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, NULL, counter, 0, src, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, nonce, counter, len, NULL, dst )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, nonce, counter, len, src, NULL )
+                 == MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chacha20_crypt( key, nonce, counter, 0, NULL, NULL )
+                 == 0 );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
+void chacha20_self_test()
+{
+    TEST_ASSERT( mbedtls_chacha20_self_test( 1 ) == 0 );
+}
+/* END_CASE */
diff --git a/tests/suites/test_suite_chachapoly.data b/tests/suites/test_suite_chachapoly.data
new file mode 100644
index 0000000..34cb568
--- /dev/null
+++ b/tests/suites/test_suite_chachapoly.data
@@ -0,0 +1,27 @@
+ChaCha20-Poly1305 RFC 7539 Example and Test Vector (Encrypt)
+mbedtls_chachapoly_enc:"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f":"070000004041424344454647":"50515253c0c1c2c3c4c5c6c7":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116":"1ae10b594f09e26a7e902ecbd0600691"
+
+ChaCha20-Poly1305 RFC 7539 Example and Test Vector (Decrypt)
+mbedtls_chachapoly_dec:"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f":"070000004041424344454647":"50515253c0c1c2c3c4c5c6c7":"d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"1ae10b594f09e26a7e902ecbd0600691":0
+
+ChaCha20-Poly1305 RFC 7539 Example and Test Vector (Decrypt, not authentic)
+mbedtls_chachapoly_dec:"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f":"070000004041424344454647":"50515253c0c1c2c3c4c5c6c7":"d31a8d34648e60db7b86afbc53ef7ec2a4aded51296e08fea9e2b5a736ee62d63dbea45e8ca9671282fafb69da92728b1a71de0a9e060b2905d6a5b67ecd3b3692ddbd7f2d778b8c9803aee328091b58fab324e4fad675945585808b4831d7bc3ff4def08e4b7a9de576d26586cec64b6116":"4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e20776f756c642062652069742e":"1ae10b594f09e26a7e902ecbd0600690":MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED
+
+ChaCha20-Poly1305 RFC 7539 Test Vector #1 (Encrypt)
+mbedtls_chachapoly_enc:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"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":"64a0861575861af460f062c79be643bd5e805cfd345cf389f108670ac76c8cb24c6cfc18755d43eea09ee94e382d26b0bdb7b73c321b0100d4f03b7f355894cf332f830e710b97ce98c8a84abd0b948114ad176e008d33bd60f982b1ff37c8559797a06ef4f0ef61c186324e2b3506383606907b6a7c02b0f9f6157b53c867e4b9166c767b804d46a59b5216cde7a4e99040c5a40433225ee282a1b0a06c523eaf4534d7f83fa1155b0047718cbc546a0d072b04b3564eea1b422273f548271a0bb2316053fa76991955ebd63159434ecebb4e466dae5a1073a6727627097a1049e617d91d361094fa68f0ff77987130305beaba2eda04df997b714d6c6f2c29a6ad5cb4022b02709b":"eead9d67890cbb22392336fea1851f38"
+
+ChaCha20-Poly1305 RFC 7539 Test Vector #1 (Decrypt)
+mbedtls_chachapoly_dec:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"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":"496e7465726e65742d4472616674732061726520647261667420646f63756d656e74732076616c696420666f722061206d6178696d756d206f6620736978206d6f6e74687320616e64206d617920626520757064617465642c207265706c616365642c206f72206f62736f6c65746564206279206f7468657220646f63756d656e747320617420616e792074696d652e20497420697320696e617070726f70726961746520746f2075736520496e7465726e65742d447261667473206173207265666572656e6365206d6174657269616c206f7220746f2063697465207468656d206f74686572207468616e206173202fe2809c776f726b20696e2070726f67726573732e2fe2809d":"eead9d67890cbb22392336fea1851f38":0
+
+ChaCha20-Poly1305 RFC 7539 Test Vector #1 (Decrypt, not authentic)
+mbedtls_chachapoly_dec:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"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":"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":"fead9d67890cbb22392336fea1851f38":MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED
+
+ChaCha20-Poly1305 State Flow
+chachapoly_state:
+
+ChaCha20-Poly1305 Parameter Validation
+chachapoly_bad_params:
+
+ChaCha20-Poly1305 Selftest
+depends_on:MBEDTLS_SELF_TEST
+chachapoly_selftest:
diff --git a/tests/suites/test_suite_chachapoly.function b/tests/suites/test_suite_chachapoly.function
new file mode 100644
index 0000000..e379309
--- /dev/null
+++ b/tests/suites/test_suite_chachapoly.function
@@ -0,0 +1,356 @@
+/* BEGIN_HEADER */
+#include "mbedtls/chachapoly.h"
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_CHACHAPOLY_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void mbedtls_chachapoly_enc( char *hex_key_string, char *hex_nonce_string, char *hex_aad_string, char *hex_input_string, char *hex_output_string, char *hex_mac_string )
+{
+    unsigned char key_str[32]; /* size set by the standard */
+    unsigned char nonce_str[12]; /* size set by the standard */
+    unsigned char aad_str[12]; /* max size of test data so far */
+    unsigned char input_str[265]; /* max size of binary input/output so far */
+    unsigned char output_str[265];
+    unsigned char output[265];
+    unsigned char mac_str[16]; /* size set by the standard */
+    unsigned char mac[16]; /* size set by the standard */
+    size_t input_len;
+    size_t output_len;
+    size_t aad_len;
+    size_t key_len;
+    size_t nonce_len;
+    size_t mac_len;
+    mbedtls_chachapoly_context ctx;
+
+    memset( key_str,    0x00, sizeof( key_str ) );
+    memset( nonce_str,  0x00, sizeof( nonce_str ) );
+    memset( aad_str,    0x00, sizeof( aad_str ) );
+    memset( input_str,  0x00, sizeof( input_str ) );
+    memset( output_str, 0x00, sizeof( output_str ) );
+    memset( mac_str,    0x00, sizeof( mac_str ) );
+
+    aad_len    = unhexify( aad_str,    hex_aad_string    );
+    input_len  = unhexify( input_str,  hex_input_string  );
+    output_len = unhexify( output_str, hex_output_string );
+    key_len    = unhexify( key_str,    hex_key_string    );
+    nonce_len  = unhexify( nonce_str,  hex_nonce_string  );
+    mac_len    = unhexify( mac_str,    hex_mac_string    );
+
+    TEST_ASSERT( key_len   == 32 );
+    TEST_ASSERT( nonce_len == 12 );
+    TEST_ASSERT( mac_len   == 16 );
+
+    mbedtls_chachapoly_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key_str ) == 0 );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce_str,
+                                      aad_str, aad_len,
+                                      input_str, output, mac ) == 0 );
+
+    TEST_ASSERT( memcmp( output_str, output, output_len ) == 0 );
+    TEST_ASSERT( memcmp( mac_str, mac, 16U ) == 0 );
+
+exit:
+    mbedtls_chachapoly_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void mbedtls_chachapoly_dec( char *hex_key_string, char *hex_nonce_string, char *hex_aad_string, char *hex_input_string, char *hex_output_string, char *hex_mac_string, int ret_exp )
+{
+    unsigned char key_str[32]; /* size set by the standard */
+    unsigned char nonce_str[12]; /* size set by the standard */
+    unsigned char aad_str[12]; /* max size of test data so far */
+    unsigned char input_str[265]; /* max size of binary input/output so far */
+    unsigned char output_str[265];
+    unsigned char output[265];
+    unsigned char mac_str[16]; /* size set by the standard */
+    size_t input_len;
+    size_t output_len;
+    size_t aad_len;
+    size_t key_len;
+    size_t nonce_len;
+    size_t mac_len;
+    int ret;
+    mbedtls_chachapoly_context ctx;
+
+    memset( key_str,    0x00, sizeof( key_str ) );
+    memset( nonce_str,  0x00, sizeof( nonce_str ) );
+    memset( aad_str,    0x00, sizeof( aad_str ) );
+    memset( input_str,  0x00, sizeof( input_str ) );
+    memset( output_str, 0x00, sizeof( output_str ) );
+    memset( mac_str,    0x00, sizeof( mac_str ) );
+
+    aad_len    = unhexify( aad_str,    hex_aad_string    );
+    input_len  = unhexify( input_str,  hex_input_string  );
+    output_len = unhexify( output_str, hex_output_string );
+    key_len    = unhexify( key_str,    hex_key_string    );
+    nonce_len  = unhexify( nonce_str,  hex_nonce_string  );
+    mac_len    = unhexify( mac_str,    hex_mac_string    );
+
+    TEST_ASSERT( key_len   == 32 );
+    TEST_ASSERT( nonce_len == 12 );
+    TEST_ASSERT( mac_len   == 16 );
+
+    mbedtls_chachapoly_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key_str ) == 0 );
+
+    ret = mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce_str,
+                                           aad_str, aad_len,
+                                           mac_str, input_str, output );
+
+    TEST_ASSERT( ret == ret_exp );
+    if( ret_exp == 0 )
+    {
+        TEST_ASSERT( memcmp( output_str, output, output_len ) == 0 );
+    }
+
+exit:
+    mbedtls_chachapoly_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void chachapoly_bad_params()
+{
+    unsigned char key[32];
+    unsigned char nonce[12];
+    unsigned char aad[1];
+    unsigned char input[1];
+    unsigned char output[1];
+    unsigned char mac[16];
+    size_t input_len = sizeof( input );
+    size_t aad_len = sizeof( aad );
+    mbedtls_chachapoly_context ctx;
+
+    memset( key,    0x00, sizeof( key ) );
+    memset( nonce,  0x00, sizeof( nonce ) );
+    memset( aad,    0x00, sizeof( aad ) );
+    memset( input,  0x00, sizeof( input ) );
+    memset( output, 0x00, sizeof( output ) );
+    memset( mac,    0x00, sizeof( mac ) );
+
+    mbedtls_chachapoly_init( NULL );
+    mbedtls_chachapoly_free( NULL );
+
+    mbedtls_chachapoly_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chachapoly_setkey( NULL, key )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( NULL,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      aad, 0,
+                                      input, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, NULL,
+                                      aad, 0,
+                                      input, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      NULL, aad_len,
+                                      input, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce,
+                                      aad, 0,
+                                      NULL, output, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce,
+                                      aad, 0,
+                                      input, NULL, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      aad, 0,
+                                      input, output, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( NULL,
+                                           0, nonce,
+                                           aad, 0,
+                                           mac, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, NULL,
+                                           aad, 0,
+                                           mac, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, nonce,
+                                           NULL, aad_len,
+                                           mac, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, nonce,
+                                           aad, 0,
+                                           NULL, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce,
+                                           aad, 0,
+                                           mac, NULL, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce,
+                                           aad, 0,
+                                           mac, input, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      0, nonce,
+                                      aad, aad_len,
+                                      NULL, NULL, mac )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           0, nonce,
+                                           aad, aad_len,
+                                           mac, NULL, NULL )
+                 == 0 );
+
+    TEST_ASSERT( mbedtls_chachapoly_crypt_and_tag( &ctx,
+                                      MBEDTLS_CHACHAPOLY_ENCRYPT,
+                                      input_len, nonce,
+                                      NULL, 0,
+                                      input, output, mac )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_auth_decrypt( &ctx,
+                                           input_len, nonce,
+                                           NULL, 0,
+                                           mac, input, output )
+                 == 0 );
+
+    TEST_ASSERT( mbedtls_chachapoly_starts( NULL, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, NULL, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( NULL, aad, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, NULL, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_update( NULL, input_len, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, NULL, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_chachapoly_finish( NULL, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, NULL )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_INPUT_DATA );
+
+exit:
+    mbedtls_chachapoly_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void chachapoly_state()
+{
+    unsigned char key[32];
+    unsigned char nonce[12];
+    unsigned char aad[1];
+    unsigned char input[1];
+    unsigned char output[1];
+    unsigned char mac[16];
+    size_t input_len = sizeof( input );
+    size_t aad_len = sizeof( aad );
+    mbedtls_chachapoly_context ctx;
+
+    memset( key,    0x00, sizeof( key ) );
+    memset( nonce,  0x00, sizeof( nonce ) );
+    memset( aad,    0x00, sizeof( aad ) );
+    memset( input,  0x00, sizeof( input ) );
+    memset( output, 0x00, sizeof( output ) );
+    memset( mac,    0x00, sizeof( mac ) );
+
+    /* Initial state: finish, update, update_aad forbidden */
+    mbedtls_chachapoly_init( &ctx );
+
+    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+
+    /* Still initial state: finish, update, update_aad forbidden */
+    TEST_ASSERT( mbedtls_chachapoly_setkey( &ctx, key )
+                 == 0 );
+
+    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+
+    /* Starts -> finish OK */
+    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
+                 == 0 );
+
+    /* After finish: update, update_aad forbidden */
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+
+    /* Starts -> update* OK */
+    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_update( &ctx, input_len, input, output )
+                 == 0 );
+
+    /* After update: update_aad forbidden */
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
+                 == MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+
+    /* Starts -> update_aad* -> finish OK */
+    TEST_ASSERT( mbedtls_chachapoly_starts( &ctx, nonce, MBEDTLS_CHACHAPOLY_ENCRYPT )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_update_aad( &ctx, aad, aad_len )
+                 == 0 );
+    TEST_ASSERT( mbedtls_chachapoly_finish( &ctx, mac )
+                 == 0 );
+
+exit:
+    mbedtls_chachapoly_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
+void chachapoly_selftest()
+{
+    TEST_ASSERT( mbedtls_chachapoly_self_test( 1 ) == 0 );
+}
+/* END_CASE */
diff --git a/tests/suites/test_suite_cipher.chacha20.data b/tests/suites/test_suite_cipher.chacha20.data
new file mode 100644
index 0000000..c67e582
--- /dev/null
+++ b/tests/suites/test_suite_cipher.chacha20.data
@@ -0,0 +1,115 @@
+Decrypt empty buffer
+depends_on:MBEDTLS_CHACHA20_C
+dec_empty_buf:
+
+Chacha20 RFC 7539 Test Vector #1
+depends_on:MBEDTLS_CHACHA20_C
+decrypt_test_vec:MBEDTLS_CIPHER_CHACHA20:-1:"0000000000000000000000000000000000000000000000000000000000000000":"000000000000000000000000":"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7724e03fb8d84a376a43b8f41518a11cc387b669b2ee6586":"00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000":"":"":0:0
+
+ChaCha20 Encrypt and decrypt 0 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:0:-1
+
+ChaCha20 Encrypt and decrypt 1 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:1:-1
+
+ChaCha20 Encrypt and decrypt 2 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:2:-1
+
+ChaCha20 Encrypt and decrypt 7 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:7:-1
+
+ChaCha20 Encrypt and decrypt 8 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:8:-1
+
+ChaCha20 Encrypt and decrypt 9 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:9:-1
+
+ChaCha20 Encrypt and decrypt 15 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:15:-1
+
+ChaCha20 Encrypt and decrypt 16 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:16:-1
+
+ChaCha20 Encrypt and decrypt 17 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:17:-1
+
+ChaCha20 Encrypt and decrypt 31 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:31:-1
+
+ChaCha20 Encrypt and decrypt 32 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:32:-1
+
+ChaCha20 Encrypt and decrypt 33 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:33:-1
+
+ChaCha20 Encrypt and decrypt 47 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:47:-1
+
+ChaCha20 Encrypt and decrypt 48 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:48:-1
+
+ChaCha20 Encrypt and decrypt 49 bytes
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20:"CHACHA20":256:49:-1
+
+ChaCha20 Encrypt and decrypt 0 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:0:0:-1:0:0:0:0
+
+ChaCha20 Encrypt and decrypt 1 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:1:0:-1:1:0:1:0
+
+ChaCha20 Encrypt and decrypt 1 bytes in multiple parts 2
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:0:1:-1:0:1:0:1
+
+ChaCha20 Encrypt and decrypt 16 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:16:0:-1:16:0:16:0
+
+ChaCha20 Encrypt and decrypt 16 bytes in multiple parts 2
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:0:16:-1:0:16:0:16
+
+ChaCha20 Encrypt and decrypt 16 bytes in multiple parts 3
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:1:15:-1:1:15:1:15
+
+ChaCha20 Encrypt and decrypt 16 bytes in multiple parts 4
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:15:1:-1:15:1:15:1
+
+ChaCha20 Encrypt and decrypt 22 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:15:7:-1:15:7:15:7
+
+ChaCha20 Encrypt and decrypt 22 bytes in multiple parts 2
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:7:15:-1:7:15:7:15
+
+ChaCha20 Encrypt and decrypt 22 bytes in multiple parts 3
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:16:6:-1:16:6:16:6
+
+ChaCha20 Encrypt and decrypt 22 bytes in multiple parts 4
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:6:16:-1:6:16:6:16
+
+ChaCha20 Encrypt and decrypt 32 bytes in multiple parts
+depends_on:MBEDTLS_CHACHA20_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20:256:16:16:-1:16:16:16:16
diff --git a/tests/suites/test_suite_cipher.chachapoly.data b/tests/suites/test_suite_cipher.chachapoly.data
new file mode 100644
index 0000000..1760dc0
--- /dev/null
+++ b/tests/suites/test_suite_cipher.chachapoly.data
@@ -0,0 +1,123 @@
+Decrypt empty buffer
+depends_on:MBEDTLS_CHACHAPOLY_C:
+dec_empty_buf:
+
+ChaCha20+Poly1305 Encrypt and decrypt 0 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:0:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 1 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:1:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 2 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:2:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 7 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:7:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 8 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:8:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 9 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:9:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 15 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:15:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 16 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:16:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 17 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:17:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 31 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:31:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 32 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:32:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 33 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:33:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 47 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:47:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 48 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:48:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 49 bytes
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf:MBEDTLS_CIPHER_CHACHA20_POLY1305:"CHACHA20-POLY1305":256:49:-1
+
+ChaCha20+Poly1305 Encrypt and decrypt 0 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:0:0:-1:0:0:0:0
+
+ChaCha20+Poly1305 Encrypt and decrypt 1 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:1:0:-1:1:0:1:0
+
+ChaCha20+Poly1305 Encrypt and decrypt 1 bytes in multiple parts 2
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:0:1:-1:0:1:0:1
+
+ChaCha20+Poly1305 Encrypt and decrypt 16 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:16:0:-1:16:0:16:0
+
+ChaCha20+Poly1305 Encrypt and decrypt 16 bytes in multiple parts 2
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:0:16:-1:0:16:0:16
+
+ChaCha20+Poly1305 Encrypt and decrypt 16 bytes in multiple parts 3
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:1:15:-1:1:15:1:15
+
+ChaCha20+Poly1305 Encrypt and decrypt 16 bytes in multiple parts 4
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:15:1:-1:15:1:15:1
+
+ChaCha20+Poly1305 Encrypt and decrypt 22 bytes in multiple parts 1
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:15:7:-1:15:7:15:7
+
+ChaCha20+Poly1305 Encrypt and decrypt 22 bytes in multiple parts 2
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:7:15:-1:7:15:7:15
+
+ChaCha20+Poly1305 Encrypt and decrypt 22 bytes in multiple parts 3
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:16:6:-1:16:6:16:6
+
+ChaCha20+Poly1305 Encrypt and decrypt 22 bytes in multiple parts 4
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:6:16:-1:6:16:6:16
+
+ChaCha20+Poly1305 Encrypt and decrypt 32 bytes in multiple parts
+depends_on:MBEDTLS_CHACHAPOLY_C
+enc_dec_buf_multipart:MBEDTLS_CIPHER_CHACHA20_POLY1305:256:16:16:-1:16:16:16:16
+
+ChaCha20+Poly1305 RFC 7539 Test Vector #1
+depends_on:MBEDTLS_CHACHAPOLY_C
+auth_crypt_tv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"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":"eead9d67890cbb22392336fea1851f38":"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"
+
+ChaCha20+Poly1305 RFC 7539 Test Vector #1 Unauthentic (1st bit flipped)
+depends_on:MBEDTLS_CHACHAPOLY_C
+auth_crypt_tv:MBEDTLS_CIPHER_CHACHA20_POLY1305:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"f33388860000000000004e91":"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":"6ead9d67890cbb22392336fea1851f38":"FAIL"
+
+Chacha20+Poly1305 RFC 7539 Test Vector #1 (streaming)
+depends_on:MBEDTLS_CHACHAPOLY_C
+decrypt_test_vec:MBEDTLS_CIPHER_CHACHA20_POLY1305:-1:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"000000000102030405060708":"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":"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":"f33388860000000000004e91":"eead9d67890cbb22392336fea1851f38":0:0
diff --git a/tests/suites/test_suite_cipher.function b/tests/suites/test_suite_cipher.function
index 8f1109e..b7037a0 100644
--- a/tests/suites/test_suite_cipher.function
+++ b/tests/suites/test_suite_cipher.function
@@ -60,7 +60,7 @@
     TEST_ASSERT( mbedtls_cipher_reset( NULL ) == MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
     TEST_ASSERT( mbedtls_cipher_reset( &ctx ) == MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( mbedtls_cipher_update_ad( NULL, buf, 0 )
                  == MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
     TEST_ASSERT( mbedtls_cipher_update_ad( &ctx, buf, 0 )
@@ -77,7 +77,7 @@
     TEST_ASSERT( mbedtls_cipher_finish( &ctx, buf, &olen )
                  == MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( mbedtls_cipher_write_tag( NULL, buf, olen )
                  == MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
     TEST_ASSERT( mbedtls_cipher_write_tag( &ctx, buf, olen )
@@ -195,7 +195,7 @@
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_dec ) );
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_enc ) );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx_dec, ad, sizeof( ad ) - i ) );
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx_enc, ad, sizeof( ad ) - i ) );
 #endif
@@ -215,7 +215,7 @@
     TEST_ASSERT( 0 == mbedtls_cipher_finish( &ctx_enc, encbuf + outlen, &outlen ) );
     total_len += outlen;
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_write_tag( &ctx_enc, tag, sizeof( tag ) ) );
 #endif
 
@@ -236,7 +236,7 @@
     TEST_ASSERT( 0 == mbedtls_cipher_finish( &ctx_dec, decbuf + outlen, &outlen ) );
     total_len += outlen;
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_check_tag( &ctx_dec, tag, sizeof( tag ) ) );
 #endif
 
@@ -292,7 +292,7 @@
 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
     TEST_ASSERT( 0 == mbedtls_cipher_set_iv( &ctx, iv, 16 ) );
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx ) );
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx, NULL, 0 ) );
 #endif
 
@@ -340,7 +340,7 @@
 
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_dec ) );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx_dec, NULL, 0 ) );
 #endif
 
@@ -416,7 +416,7 @@
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_dec ) );
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx_enc ) );
 
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx_dec, NULL, 0 ) );
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx_enc, NULL, 0 ) );
 #endif
@@ -479,16 +479,16 @@
 {
     unsigned char key[50];
     unsigned char iv[50];
-    unsigned char cipher[200];
-    unsigned char clear[200];
+    unsigned char cipher[265]; /* max length of test data so far */
+    unsigned char clear[265];
+    unsigned char output[265];
     unsigned char ad[200];
     unsigned char tag[20];
     size_t key_len, iv_len, cipher_len, clear_len;
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     size_t ad_len, tag_len;
 #endif
     mbedtls_cipher_context_t ctx;
-    unsigned char output[200];
     size_t outlen, total_len;
 
     mbedtls_cipher_init( &ctx );
@@ -505,7 +505,7 @@
     iv_len = unhexify( iv, hex_iv );
     cipher_len = unhexify( cipher, hex_cipher );
     clear_len = unhexify( clear, hex_clear );
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     ad_len = unhexify( ad, hex_ad );
     tag_len = unhexify( tag, hex_tag );
 #else
@@ -525,7 +525,7 @@
 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
     TEST_ASSERT( 0 == mbedtls_cipher_set_iv( &ctx, iv, iv_len ) );
     TEST_ASSERT( 0 == mbedtls_cipher_reset( &ctx ) );
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( 0 == mbedtls_cipher_update_ad( &ctx, ad, ad_len ) );
 #endif
 
@@ -536,7 +536,7 @@
     TEST_ASSERT( finish_result == mbedtls_cipher_finish( &ctx, output + outlen,
                                                  &outlen ) );
     total_len += outlen;
-#if defined(MBEDTLS_GCM_C)
+#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
     TEST_ASSERT( tag_result == mbedtls_cipher_check_tag( &ctx, tag, tag_len ) );
 #endif
 
@@ -560,14 +560,14 @@
     int ret;
     unsigned char key[50];
     unsigned char iv[50];
-    unsigned char cipher[200];
-    unsigned char clear[200];
+    unsigned char cipher[265]; /* max size of test data so far */
+    unsigned char clear[265];
+    unsigned char output[267]; /* above + 2 (overwrite check) */
     unsigned char ad[200];
     unsigned char tag[20];
     unsigned char my_tag[20];
     size_t key_len, iv_len, cipher_len, clear_len, ad_len, tag_len;
     mbedtls_cipher_context_t ctx;
-    unsigned char output[200];
     size_t outlen;
 
     mbedtls_cipher_init( &ctx );
diff --git a/tests/suites/test_suite_poly1305.data b/tests/suites/test_suite_poly1305.data
new file mode 100644
index 0000000..13912e9
--- /dev/null
+++ b/tests/suites/test_suite_poly1305.data
@@ -0,0 +1,42 @@
+Poly1305 RFC 7539 Example And Test Vector
+mbedtls_poly1305:"85d6be7857556d337f4452fe42d506a80103808afb0db2fd4abff6af4149f51b":"a8061dc1305136c6c22b8baf0c0127a9":"43727970746f6772617068696320466f72756d2052657365617263682047726f7570"
+
+Poly1305 RFC 7539 Test Vector #1
+mbedtls_poly1305:"0000000000000000000000000000000000000000000000000000000000000000":"00000000000000000000000000000000":"00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+
+Poly1305 RFC 7539 Test Vector #2
+mbedtls_poly1305:"0000000000000000000000000000000036e5f6b5c5e06070f0efca96227a863e":"36e5f6b5c5e06070f0efca96227a863e":"416e79207375626d697373696f6e20746f20746865204945544620696e74656e6465642062792074686520436f6e7472696275746f7220666f72207075626c69636174696f6e20617320616c6c206f722070617274206f6620616e204945544620496e7465726e65742d4472616674206f722052464320616e6420616e792073746174656d656e74206d6164652077697468696e2074686520636f6e74657874206f6620616e204945544620616374697669747920697320636f6e7369646572656420616e20224945544620436f6e747269627574696f6e222e20537563682073746174656d656e747320696e636c756465206f72616c2073746174656d656e747320696e20494554462073657373696f6e732c2061732077656c6c206173207772697474656e20616e6420656c656374726f6e696320636f6d6d756e69636174696f6e73206d61646520617420616e792074696d65206f7220706c6163652c207768696368206172652061646472657373656420746f"
+
+Poly1305 RFC 7539 Test Vector #3
+mbedtls_poly1305:"36e5f6b5c5e06070f0efca96227a863e00000000000000000000000000000000":"f3477e7cd95417af89a6b8794c310cf0":"416e79207375626d697373696f6e20746f20746865204945544620696e74656e6465642062792074686520436f6e7472696275746f7220666f72207075626c69636174696f6e20617320616c6c206f722070617274206f6620616e204945544620496e7465726e65742d4472616674206f722052464320616e6420616e792073746174656d656e74206d6164652077697468696e2074686520636f6e74657874206f6620616e204945544620616374697669747920697320636f6e7369646572656420616e20224945544620436f6e747269627574696f6e222e20537563682073746174656d656e747320696e636c756465206f72616c2073746174656d656e747320696e20494554462073657373696f6e732c2061732077656c6c206173207772697474656e20616e6420656c656374726f6e696320636f6d6d756e69636174696f6e73206d61646520617420616e792074696d65206f7220706c6163652c207768696368206172652061646472657373656420746f"
+
+Poly1305 RFC 7539 Test Vector #4
+mbedtls_poly1305:"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0":"4541669a7eaaee61e708dc7cbcc5eb62":"2754776173206272696c6c69672c20616e642074686520736c6974687920746f7665730a446964206779726520616e642067696d626c6520696e2074686520776162653a0a416c6c206d696d737920776572652074686520626f726f676f7665732c0a416e6420746865206d6f6d65207261746873206f757467726162652e"
+
+Poly1305 RFC 7539 Test Vector #5
+mbedtls_poly1305:"0200000000000000000000000000000000000000000000000000000000000000":"03000000000000000000000000000000":"ffffffffffffffffffffffffffffffff"
+
+Poly1305 RFC 7539 Test Vector #6
+mbedtls_poly1305:"02000000000000000000000000000000ffffffffffffffffffffffffffffffff":"03000000000000000000000000000000":"02000000000000000000000000000000"
+
+Poly1305 RFC 7539 Test Vector #7
+mbedtls_poly1305:"0100000000000000000000000000000000000000000000000000000000000000":"05000000000000000000000000000000":"fffffffffffffffffffffffffffffffff0ffffffffffffffffffffffffffffff11000000000000000000000000000000"
+
+Poly1305 RFC 7539 Test Vector #8
+mbedtls_poly1305:"0100000000000000000000000000000000000000000000000000000000000000":"00000000000000000000000000000000":"fffffffffffffffffffffffffffffffffbfefefefefefefefefefefefefefefe01010101010101010101010101010101"
+
+Poly1305 RFC 7539 Test Vector #9
+mbedtls_poly1305:"0200000000000000000000000000000000000000000000000000000000000000":"faffffffffffffffffffffffffffffff":"fdffffffffffffffffffffffffffffff"
+
+Poly1305 RFC 7539 Test Vector #10
+mbedtls_poly1305:"0100000000000000040000000000000000000000000000000000000000000000":"14000000000000005500000000000000":"e33594d7505e43b900000000000000003394d7505e4379cd01000000000000000000000000000000000000000000000001000000000000000000000000000000"
+
+Poly1305 RFC 7539 Test Vector #11
+mbedtls_poly1305:"0100000000000000040000000000000000000000000000000000000000000000":"13000000000000000000000000000000":"e33594d7505e43b900000000000000003394d7505e4379cd010000000000000000000000000000000000000000000000"
+
+Poly1305 Parameter validation
+poly1305_bad_params:
+
+Poly1305 Selftest
+depends_on:MBEDTLS_SELF_TEST
+poly1305_selftest:
diff --git a/tests/suites/test_suite_poly1305.function b/tests/suites/test_suite_poly1305.function
new file mode 100644
index 0000000..62d2ad9
--- /dev/null
+++ b/tests/suites/test_suite_poly1305.function
@@ -0,0 +1,140 @@
+/* BEGIN_HEADER */
+#include "mbedtls/poly1305.h"
+#include <stddef.h>
+/* END_HEADER */
+
+/* BEGIN_DEPENDENCIES
+ * depends_on:MBEDTLS_POLY1305_C
+ * END_DEPENDENCIES
+ */
+
+/* BEGIN_CASE */
+void mbedtls_poly1305( char *hex_key_string, char *hex_mac_string, char *hex_src_string  )
+{
+    unsigned char src_str[375]; /* max size of binary input */
+    unsigned char key[32]; /* size set by the standard */
+    unsigned char mac[16]; /* size set by the standard */
+    unsigned char mac_str[33]; /* hex expansion of the above */
+    size_t src_len;
+    mbedtls_poly1305_context ctx;
+
+    memset( src_str, 0x00, sizeof( src_str ) );
+    memset( mac_str, 0x00, sizeof( mac_str ) );
+    memset( key,     0x00, sizeof( key ) );
+    memset( mac,     0x00, sizeof( mac ) );
+
+    src_len = unhexify( src_str, hex_src_string );
+    unhexify( key, hex_key_string );
+
+    /*
+     * Test the integrated API
+     */
+    TEST_ASSERT( mbedtls_poly1305_mac( key, src_str, src_len, mac ) == 0 );
+
+    hexify( mac_str, mac, 16 );
+    TEST_ASSERT( strcmp( (char *) mac_str, hex_mac_string ) == 0 );
+
+    /*
+     * Test the streaming API
+     */
+    mbedtls_poly1305_init( &ctx );
+
+    TEST_ASSERT( mbedtls_poly1305_starts( &ctx, key ) == 0 );
+
+    TEST_ASSERT( mbedtls_poly1305_update( &ctx, src_str, src_len ) == 0 );
+
+    TEST_ASSERT( mbedtls_poly1305_finish( &ctx, mac ) == 0 );
+
+    hexify( mac_str, mac, 16 );
+    TEST_ASSERT( strcmp( (char *) mac_str, hex_mac_string ) == 0 );
+
+    /*
+     * Test the streaming API again, piecewise
+     */
+
+    /* Don't free/init the context, in order to test that starts() does the
+     * right thing. */
+    if( src_len >= 1 )
+    {
+        TEST_ASSERT( mbedtls_poly1305_starts( &ctx, key ) == 0 );
+
+        TEST_ASSERT( mbedtls_poly1305_update( &ctx, src_str, 1 ) == 0 );
+        TEST_ASSERT( mbedtls_poly1305_update( &ctx, src_str + 1, src_len - 1 ) == 0 );
+
+        TEST_ASSERT( mbedtls_poly1305_finish( &ctx, mac ) == 0 );
+
+        hexify( mac_str, mac, 16 );
+        TEST_ASSERT( strcmp( (char *) mac_str, hex_mac_string ) == 0 );
+    }
+
+    /*
+     * Again with more pieces
+     */
+    if( src_len >= 2 )
+    {
+        TEST_ASSERT( mbedtls_poly1305_starts( &ctx, key ) == 0 );
+
+        TEST_ASSERT( mbedtls_poly1305_update( &ctx, src_str, 1 ) == 0 );
+        TEST_ASSERT( mbedtls_poly1305_update( &ctx, src_str + 1, 1 ) == 0 );
+        TEST_ASSERT( mbedtls_poly1305_update( &ctx, src_str + 2, src_len - 2 ) == 0 );
+
+        TEST_ASSERT( mbedtls_poly1305_finish( &ctx, mac ) == 0 );
+
+        hexify( mac_str, mac, 16 );
+        TEST_ASSERT( strcmp( (char *) mac_str, hex_mac_string ) == 0 );
+    }
+
+    mbedtls_poly1305_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE */
+void poly1305_bad_params()
+{
+    unsigned char src[1];
+    unsigned char key[32];
+    unsigned char mac[16];
+    size_t src_len = sizeof( src );
+    mbedtls_poly1305_context ctx;
+
+    mbedtls_poly1305_init( NULL );
+    mbedtls_poly1305_free( NULL );
+
+    mbedtls_poly1305_init( &ctx );
+
+    TEST_ASSERT( mbedtls_poly1305_starts( NULL, key )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_starts( &ctx, NULL )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_poly1305_update( NULL, src, 0 )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_update( &ctx, NULL, src_len )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_update( &ctx, NULL, 0 )
+                 == 0 );
+
+    TEST_ASSERT( mbedtls_poly1305_finish( NULL, mac )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_finish( &ctx, NULL )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+
+    TEST_ASSERT( mbedtls_poly1305_mac( NULL, src, 0, mac )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_mac( key, NULL, src_len, mac )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_mac( key, src, 0, NULL )
+                 == MBEDTLS_ERR_POLY1305_BAD_INPUT_DATA );
+    TEST_ASSERT( mbedtls_poly1305_mac( key, NULL, 0, mac )
+                 == 0 );
+
+    mbedtls_poly1305_free( &ctx );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
+void poly1305_selftest()
+{
+    TEST_ASSERT( mbedtls_poly1305_self_test( 1 ) == 0 );
+}
+/* END_CASE */
diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index 4c5c480..664bcad 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -158,6 +158,8 @@
     <ClInclude Include="..\..\include\mbedtls\camellia.h" />
     <ClInclude Include="..\..\include\mbedtls\ccm.h" />
     <ClInclude Include="..\..\include\mbedtls\certs.h" />
+    <ClInclude Include="..\..\include\mbedtls\chacha20.h" />
+    <ClInclude Include="..\..\include\mbedtls\chachapoly.h" />
     <ClInclude Include="..\..\include\mbedtls\check_config.h" />
     <ClInclude Include="..\..\include\mbedtls\cipher.h" />
     <ClInclude Include="..\..\include\mbedtls\cipher_internal.h" />
@@ -199,6 +201,7 @@
     <ClInclude Include="..\..\include\mbedtls\platform.h" />
     <ClInclude Include="..\..\include\mbedtls\platform_time.h" />
     <ClInclude Include="..\..\include\mbedtls\platform_util.h" />
+    <ClInclude Include="..\..\include\mbedtls\poly1305.h" />
     <ClInclude Include="..\..\include\mbedtls\ripemd160.h" />
     <ClInclude Include="..\..\include\mbedtls\rsa.h" />
     <ClInclude Include="..\..\include\mbedtls\rsa_internal.h" />
@@ -232,6 +235,8 @@
     <ClCompile Include="..\..\library\camellia.c" />
     <ClCompile Include="..\..\library\ccm.c" />
     <ClCompile Include="..\..\library\certs.c" />
+    <ClCompile Include="..\..\library\chacha20.c" />
+    <ClCompile Include="..\..\library\chachapoly.c" />
     <ClCompile Include="..\..\library\cipher.c" />
     <ClCompile Include="..\..\library\cipher_wrap.c" />
     <ClCompile Include="..\..\library\cmac.c" />
@@ -270,6 +275,7 @@
     <ClCompile Include="..\..\library\pkwrite.c" />
     <ClCompile Include="..\..\library\platform.c" />
     <ClCompile Include="..\..\library\platform_util.c" />
+    <ClCompile Include="..\..\library\poly1305.c" />
     <ClCompile Include="..\..\library\ripemd160.c" />
     <ClCompile Include="..\..\library\rsa.c" />
     <ClCompile Include="..\..\library\rsa_internal.c" />