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Ommit AEAD functions if GCM not defined

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-09-03 16:35:53 +02:00
parent aa9ffc5e98
commit 43a4780b03
3 changed files with 58 additions and 28 deletions
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61
library/cipher.c
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@ -425,6 +425,7 @@ int cipher_reset( cipher_context_t *ctx )
return 0;
}
#if defined(POLARSSL_CIPHER_MODE_AEAD)
int cipher_update_ad( cipher_context_t *ctx,
const unsigned char *ad, size_t ad_len )
{
@ -444,13 +445,11 @@ int cipher_update_ad( cipher_context_t *ctx,
return gcm_starts( ctx->cipher_ctx, ctx->operation,
ctx->iv, ctx->iv_size, ad, ad_len );
}
#else
((void) ad);
((void) ad_len);
#endif
return 0;
}
#endif /* POLARSSL_CIPHER_MODE_AEAD */
int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen )
@ -904,50 +903,62 @@ int cipher_set_padding_mode( cipher_context_t *ctx, cipher_padding_t mode )
return 0;
}
#if defined(POLARSSL_CIPHER_MODE_AEAD)
int cipher_write_tag( cipher_context_t *ctx,
unsigned char *tag, size_t tag_len )
{
if( NULL == ctx || NULL == ctx->cipher_info || NULL == tag )
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
if( POLARSSL_MODE_GCM != ctx->cipher_info->mode )
return( 0 );
if( POLARSSL_ENCRYPT != ctx->operation )
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
return gcm_finish( ctx->cipher_ctx, tag, tag_len );
#if defined(POLARSSL_GCM_C)
if( POLARSSL_MODE_GCM == ctx->cipher_info->mode )
return gcm_finish( ctx->cipher_ctx, tag, tag_len );
#endif
return 0;
}
int cipher_check_tag( cipher_context_t *ctx,
const unsigned char *tag, size_t tag_len )
{
int ret;
unsigned char check_tag[16];
size_t i;
int diff;
if( NULL == ctx || NULL == ctx->cipher_info )
if( NULL == ctx || NULL == ctx->cipher_info ||
POLARSSL_DECRYPT != ctx->operation )
{
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(POLARSSL_GCM_C)
if( POLARSSL_MODE_GCM == ctx->cipher_info->mode )
{
unsigned char check_tag[16];
size_t i;
int diff;
if( tag_len > sizeof( check_tag ) )
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
if( 0 != ( ret = gcm_finish( ctx->cipher_ctx, check_tag, tag_len ) ) )
return( ret );
/* Check the tag in "constant-time" */
for( diff = 0, i = 0; i < tag_len; i++ )
diff |= tag[i] ^ check_tag[i];
if( diff != 0 )
return( POLARSSL_ERR_GCM_AUTH_FAILED );
if( POLARSSL_MODE_GCM != ctx->cipher_info->mode )
return( 0 );
if( POLARSSL_DECRYPT != ctx->operation || tag_len > sizeof( check_tag ) )
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
if( 0 != ( ret = gcm_finish( ctx->cipher_ctx, check_tag, tag_len ) ) )
return( ret );
/* On decryption, check the tag (in "constant-time") */
for( diff = 0, i = 0; i < tag_len; i++ )
diff |= tag[i] ^ check_tag[i];
if( diff != 0 )
return( POLARSSL_ERR_GCM_AUTH_FAILED );
}
#endif
return( 0 );
}
#endif /* POLARSSL_CIPHER_MODE_AEAD */
#if defined(POLARSSL_SELF_TEST)