Update ccm.h
minor changes based on comments
@@ -118,6 +118,7 @@ void mbedtls_ccm_free( mbedtls_ccm_context *ctx );
* 4, 6, 8, 10, 12, 14 or 16.
*
* \return \c 0 on success.
+ * \return A cipher-specific error code on failure.
*/
int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
const unsigned char *iv, size_t iv_len,
@@ -143,8 +144,8 @@ int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
* \param tag_len The length of the tag in Bytes.
* 4, 6, 8, 10, 12, 14 or 16.
*
- * \return 0 if successful and authenticated.
- * \return #MBEDTLS_ERR_CCM_AUTH_FAILED if the tag does not match.
+ * \return \c 0 on success.
+ * \return A cipher-specific error code on failure.
*/
int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
const unsigned char *iv, size_t iv_len,
