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Handle NULL as a stream cipher for more uniformity

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-08-28 16:36:14 +02:00
parent 37e230c022
commit b5e85885de
4 changed files with 42 additions and 49 deletions
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23
library/cipher.c
View File

@@ -36,7 +36,7 @@
#include <stdlib.h>
#if defined(POLARSSL_ARC4_C)
#if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER)
#define POLARSSL_CIPHER_MODE_STREAM
#endif
@@ -367,11 +367,6 @@ int cipher_setkey( cipher_context_t *ctx, const unsigned char *key,
ctx->key_length = key_length;
ctx->operation = operation;
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
if( ctx->cipher_info->mode == POLARSSL_MODE_NULL )
return 0;
#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
/*
* For CFB and CTR mode always use the encryption key schedule
*/
@@ -421,19 +416,6 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
if( ctx->cipher_info->mode == POLARSSL_MODE_NULL )
{
*olen = ilen;
if( output == input )
return( 0 );
memcpy( output, input, ilen );
return 0;
}
#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
if( ctx->cipher_info->mode == POLARSSL_MODE_CBC )
{
/*
@@ -725,8 +707,7 @@ int cipher_finish( cipher_context_t *ctx, unsigned char *output, size_t *olen)
if( POLARSSL_MODE_CFB == ctx->cipher_info->mode ||
POLARSSL_MODE_CTR == ctx->cipher_info->mode ||
POLARSSL_MODE_STREAM == ctx->cipher_info->mode ||
POLARSSL_MODE_NULL == ctx->cipher_info->mode )
POLARSSL_MODE_STREAM == ctx->cipher_info->mode )
{
return 0;
}

39
library/cipher_wrap.c
View File

@@ -645,12 +645,7 @@ static int blowfish_crypt_ctr_wrap( void *ctx, size_t length,
#endif
}
static int blowfish_setkey_dec_wrap( void *ctx, const unsigned char *key, unsigned int key_length )
{
return blowfish_setkey( (blowfish_context *) ctx, key, key_length );
}
static int blowfish_setkey_enc_wrap( void *ctx, const unsigned char *key, unsigned int key_length )
static int blowfish_setkey_wrap( void *ctx, const unsigned char *key, unsigned int key_length )
{
return blowfish_setkey( (blowfish_context *) ctx, key, key_length );
}
@@ -671,8 +666,8 @@ const cipher_base_t blowfish_info = {
blowfish_crypt_cfb64_wrap,
blowfish_crypt_ctr_wrap,
NULL,
blowfish_setkey_enc_wrap,
blowfish_setkey_dec_wrap,
blowfish_setkey_wrap,
blowfish_setkey_wrap,
blowfish_ctx_alloc,
blowfish_ctx_free
};
@@ -761,12 +756,30 @@ const cipher_info_t arc4_128_info = {
#endif /* POLARSSL_ARC4_C */
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
static int null_crypt_stream( void *ctx, size_t length,
const unsigned char *input,
unsigned char *output )
{
((void) ctx);
memmove( output, input, length );
return( 0 );
}
static int null_setkey( void *ctx, const unsigned char *key,
unsigned int key_length )
{
((void) ctx);
((void) key);
((void) key_length);
return( 0 );
}
static void * null_ctx_alloc( void )
{
return (void *) 1;
}
static void null_ctx_free( void *ctx )
{
((void) ctx);
@@ -777,16 +790,16 @@ const cipher_base_t null_base_info = {
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
null_crypt_stream,
null_setkey,
null_setkey,
null_ctx_alloc,
null_ctx_free
};
const cipher_info_t null_cipher_info = {
POLARSSL_CIPHER_NULL,
POLARSSL_MODE_NULL,
POLARSSL_MODE_STREAM,
0,
"NULL",
0,