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Add cipher_auth_{en,de}crypt()

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This commit is contained in:
Manuel Pégourié-Gonnard
2014-05-13 12:19:29 +02:00
parent 8764d271fa
commit 4562ffe2e6
2 changed files with 121 additions and 0 deletions
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56
library/cipher.c
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@ -799,6 +799,62 @@ int cipher_crypt( cipher_context_t *ctx,
return( 0 );
}
#if defined(POLARSSL_CIPHER_MODE_AEAD)
/*
* Packet-oriented encryption for AEAD modes
*/
int cipher_auth_encrypt( cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len,
const unsigned char *ad, size_t ad_len,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen,
unsigned char *tag, size_t tag_len )
{
#if defined(POLARSSL_GCM_C)
if( POLARSSL_MODE_GCM == ctx->cipher_info->mode )
{
*olen = ilen;
return( gcm_crypt_and_tag( ctx->cipher_ctx, GCM_ENCRYPT, ilen,
iv, iv_len, ad, ad_len, input, output,
tag_len, tag ) );
}
#endif
return( POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE );
}
/*
* Packet-oriented decryption for AEAD modes
*/
int cipher_auth_decrypt( cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len,
const unsigned char *ad, size_t ad_len,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen,
const unsigned char *tag, size_t tag_len )
{
#if defined(POLARSSL_GCM_C)
if( POLARSSL_MODE_GCM == ctx->cipher_info->mode )
{
int ret;
*olen = ilen;
ret = gcm_auth_decrypt( ctx->cipher_ctx, ilen,
iv, iv_len, ad, ad_len,
tag, tag_len, input, output );
if( ret == POLARSSL_ERR_GCM_AUTH_FAILED )
ret = POLARSSL_ERR_CIPHER_AUTH_FAILED;
return( ret );
}
#endif
return( POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE );
}
#endif /* POLARSSL_CIPHER_MODE_AEAD */
#if defined(POLARSSL_SELF_TEST)
/*