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authorSumit Garg <sumit.garg@linaro.org>2019-11-15 10:43:00 +0530
committerSumit Garg <sumit.garg@linaro.org>2020-03-06 16:40:37 +0530
commit7cda17bb0f92db39d123a4f2a1732c9978556453 (patch)
tree341aa1c3de6d7db4ca669c6901340905be92bb00 /include/drivers
parentd95f7a7287b21422f6a32fde8a4d735ec78e2659 (diff)
downloadtrusted-firmware-a-7cda17bb0f92db39d123a4f2a1732c9978556453.tar.gz
drivers: crypto: Add authenticated decryption framework
Add framework for autheticated decryption of data. Currently this patch optionally imports mbedtls library as a backend if build option "DECRYPTION_SUPPORT = aes_gcm" is set to perform authenticated decryption using AES-GCM algorithm. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Change-Id: I2966f0e79033151012bf4ffc66f484cd949e7271
Diffstat (limited to 'include/drivers')
-rw-r--r--include/drivers/auth/crypto_mod.h34
-rw-r--r--include/drivers/auth/mbedtls/mbedtls_config.h6
2 files changed, 36 insertions, 4 deletions
diff --git a/include/drivers/auth/crypto_mod.h b/include/drivers/auth/crypto_mod.h
index f211035d70..71cf67306d 100644
--- a/include/drivers/auth/crypto_mod.h
+++ b/include/drivers/auth/crypto_mod.h
@@ -13,9 +13,18 @@ enum crypto_ret_value {
CRYPTO_ERR_INIT,
CRYPTO_ERR_HASH,
CRYPTO_ERR_SIGNATURE,
+ CRYPTO_ERR_DECRYPTION,
CRYPTO_ERR_UNKNOWN
};
+#define CRYPTO_MAX_IV_SIZE 16U
+#define CRYPTO_MAX_TAG_SIZE 16U
+
+/* Decryption algorithm */
+enum crypto_dec_algo {
+ CRYPTO_GCM_DECRYPT = 0
+};
+
/*
* Cryptographic library descriptor
*/
@@ -44,6 +53,15 @@ typedef struct crypto_lib_desc_s {
unsigned int data_len, unsigned char *output);
#endif /* MEASURED_BOOT */
+ /*
+ * Authenticated decryption. Return one of the
+ * 'enum crypto_ret_value' options.
+ */
+ int (*auth_decrypt)(enum crypto_dec_algo dec_algo, void *data_ptr,
+ size_t len, const void *key, unsigned int key_len,
+ unsigned int key_flags, const void *iv,
+ unsigned int iv_len, const void *tag,
+ unsigned int tag_len);
} crypto_lib_desc_t;
/* Public functions */
@@ -54,6 +72,11 @@ int crypto_mod_verify_signature(void *data_ptr, unsigned int data_len,
void *pk_ptr, unsigned int pk_len);
int crypto_mod_verify_hash(void *data_ptr, unsigned int data_len,
void *digest_info_ptr, unsigned int digest_info_len);
+int crypto_mod_auth_decrypt(enum crypto_dec_algo dec_algo, void *data_ptr,
+ size_t len, const void *key, unsigned int key_len,
+ unsigned int key_flags, const void *iv,
+ unsigned int iv_len, const void *tag,
+ unsigned int tag_len);
#if MEASURED_BOOT
int crypto_mod_calc_hash(unsigned int alg, void *data_ptr,
@@ -61,21 +84,24 @@ int crypto_mod_calc_hash(unsigned int alg, void *data_ptr,
/* Macro to register a cryptographic library */
#define REGISTER_CRYPTO_LIB(_name, _init, _verify_signature, _verify_hash, \
- _calc_hash) \
+ _calc_hash, _auth_decrypt) \
const crypto_lib_desc_t crypto_lib_desc = { \
.name = _name, \
.init = _init, \
.verify_signature = _verify_signature, \
.verify_hash = _verify_hash, \
- .calc_hash = _calc_hash \
+ .calc_hash = _calc_hash, \
+ .auth_decrypt = _auth_decrypt \
}
#else
-#define REGISTER_CRYPTO_LIB(_name, _init, _verify_signature, _verify_hash) \
+#define REGISTER_CRYPTO_LIB(_name, _init, _verify_signature, _verify_hash, \
+ _auth_decrypt) \
const crypto_lib_desc_t crypto_lib_desc = { \
.name = _name, \
.init = _init, \
.verify_signature = _verify_signature, \
- .verify_hash = _verify_hash \
+ .verify_hash = _verify_hash, \
+ .auth_decrypt = _auth_decrypt \
}
#endif /* MEASURED_BOOT */
diff --git a/include/drivers/auth/mbedtls/mbedtls_config.h b/include/drivers/auth/mbedtls/mbedtls_config.h
index 6e179bbd1e..dc00da7d60 100644
--- a/include/drivers/auth/mbedtls/mbedtls_config.h
+++ b/include/drivers/auth/mbedtls/mbedtls_config.h
@@ -79,6 +79,12 @@
#define MBEDTLS_X509_USE_C
#define MBEDTLS_X509_CRT_PARSE_C
+#if TF_MBEDTLS_USE_AES_GCM
+#define MBEDTLS_AES_C
+#define MBEDTLS_CIPHER_C
+#define MBEDTLS_GCM_C
+#endif
+
/* MPI / BIGNUM options */
#define MBEDTLS_MPI_WINDOW_SIZE 2