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AES_CBC ciphersuites now run purely via cipher layer

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This commit is contained in:
Paul Bakker 2013-08-31 17:25:14 +02:00
parent f451bac000
commit da02a7f45e
2 changed files with 123 additions and 16 deletions
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3
include/polarssl/ssl.h
View File

@ -504,6 +504,9 @@ struct _ssl_transform
md_context_t md_ctx_enc; /*!< MAC (encryption) */
md_context_t md_ctx_dec; /*!< MAC (decryption) */
cipher_context_t cipher_ctx_enc; /*!< encryption context */
cipher_context_t cipher_ctx_dec; /*!< decryption context */
uint32_t ctx_enc[SSL_CTX_MAX / 4]; /*!< encryption context */
uint32_t ctx_dec[SSL_CTX_MAX / 4]; /*!< decryption context */

136
library/ssl_tls.c
View File

@ -355,6 +355,7 @@ static void ssl_calc_finished_tls_sha384(ssl_context *,unsigned char *,int);
int ssl_derive_keys( ssl_context *ssl )
{
int ret = 0;
unsigned char tmp[64];
unsigned char keyblk[256];
unsigned char *key1;
@ -648,15 +649,46 @@ int ssl_derive_keys( ssl_context *ssl )
break;
#endif
#if defined(POLARSSL_AES_C)
case POLARSSL_CIPHER_AES_128_CBC:
case POLARSSL_CIPHER_AES_256_CBC:
aes_setkey_enc( (aes_context*) transform->ctx_enc, key1,
cipher_info->key_length );
aes_setkey_dec( (aes_context*) transform->ctx_dec, key2,
cipher_info->key_length );
if( ( ret = cipher_init_ctx( &transform->cipher_ctx_enc,
cipher_info ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_setkey( &transform->cipher_ctx_enc, key1,
cipher_info->key_length,
POLARSSL_ENCRYPT ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_set_padding_mode( &transform->cipher_ctx_enc,
POLARSSL_PADDING_NONE ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_init_ctx( &transform->cipher_ctx_dec,
cipher_info ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_setkey( &transform->cipher_ctx_dec, key2,
cipher_info->key_length,
POLARSSL_DECRYPT ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_set_padding_mode( &transform->cipher_ctx_dec,
POLARSSL_PADDING_NONE ) ) != 0 )
{
return( ret );
}
break;
#endif
#if defined(POLARSSL_CAMELLIA_C)
case POLARSSL_CIPHER_CAMELLIA_128_CBC:
@ -999,8 +1031,10 @@ static int ssl_encrypt_buf( ssl_context *ssl )
else
#endif /* POLARSSL_GCM_C */
{
int ret;
unsigned char *enc_msg;
size_t enc_msglen;
size_t olen = 0;
padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
ssl->transform_out->ivlen;
@ -1065,14 +1099,49 @@ static int ssl_encrypt_buf( ssl_context *ssl )
break;
#endif
#if defined(POLARSSL_AES_C)
case POLARSSL_CIPHER_AES_128_CBC:
case POLARSSL_CIPHER_AES_256_CBC:
aes_crypt_cbc( (aes_context *) ssl->transform_out->ctx_enc,
AES_ENCRYPT, enc_msglen,
ssl->transform_out->iv_enc, enc_msg, enc_msg );
break;
if( ( ret = cipher_reset( &ssl->transform_out->cipher_ctx_enc,
ssl->transform_out->iv_enc ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_update( &ssl->transform_out->cipher_ctx_enc,
enc_msg, enc_msglen, enc_msg,
&olen ) ) != 0 )
{
return( ret );
}
enc_msglen -= olen;
if( ( ret = cipher_finish( &ssl->transform_out->cipher_ctx_enc,
enc_msg + olen, &olen ) ) != 0 )
{
return( ret );
}
if( enc_msglen != olen )
{
SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect %d %d",
enc_msglen, olen ) );
// TODO Real error number
return( -1 );
}
#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1)
if( ssl->minor_ver < SSL_MINOR_VERSION_2 )
{
/*
* Save IV in SSL3 and TLS1
*/
memcpy( ssl->transform_out->iv_enc,
ssl->transform_out->cipher_ctx_enc.iv,
ssl->transform_out->ivlen );
}
#endif
break;
#if defined(POLARSSL_CAMELLIA_C)
case POLARSSL_CIPHER_CAMELLIA_128_CBC:
@ -1190,10 +1259,12 @@ static int ssl_decrypt_buf( ssl_context *ssl )
/*
* Decrypt and check the padding
*/
int ret;
unsigned char *dec_msg;
unsigned char *dec_msg_result;
size_t dec_msglen;
size_t minlen = 0;
size_t olen = 0;
/*
* Check immediate ciphertext sanity
@ -1252,14 +1323,47 @@ static int ssl_decrypt_buf( ssl_context *ssl )
break;
#endif
#if defined(POLARSSL_AES_C)
case POLARSSL_CIPHER_AES_128_CBC:
case POLARSSL_CIPHER_AES_256_CBC:
aes_crypt_cbc( (aes_context *) ssl->transform_in->ctx_dec,
AES_DECRYPT, dec_msglen,
ssl->transform_in->iv_dec, dec_msg, dec_msg_result );
break;
if( ( ret = cipher_reset( &ssl->transform_in->cipher_ctx_dec,
ssl->transform_in->iv_dec ) ) != 0 )
{
return( ret );
}
if( ( ret = cipher_update( &ssl->transform_in->cipher_ctx_dec,
dec_msg, dec_msglen, dec_msg_result,
&olen ) ) != 0 )
{
return( ret );
}
dec_msglen -= olen;
if( ( ret = cipher_finish( &ssl->transform_in->cipher_ctx_dec,
dec_msg_result + olen, &olen ) ) != 0 )
{
return( ret );
}
if( dec_msglen != olen )
{
SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect" ) );
// TODO Real error number
return( -1 );
}
#if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1)
if( ssl->minor_ver < SSL_MINOR_VERSION_2 )
{
/*
* Save IV in SSL3 and TLS1
*/
memcpy( ssl->transform_in->iv_dec,
ssl->transform_in->cipher_ctx_dec.iv,
ssl->transform_in->ivlen );
}
#endif
break;
#if defined(POLARSSL_CAMELLIA_C)
case POLARSSL_CIPHER_CAMELLIA_128_CBC: