831 lines
24 KiB
C
831 lines
24 KiB
C
/**
|
|
* \file cipher.c
|
|
*
|
|
* \brief Generic cipher wrapper for PolarSSL
|
|
*
|
|
* \author Adriaan de Jong <dejong@fox-it.com>
|
|
*
|
|
* Copyright (C) 2006-2013, Brainspark B.V.
|
|
*
|
|
* This file is part of PolarSSL (http://www.polarssl.org)
|
|
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "polarssl/config.h"
|
|
|
|
#if defined(POLARSSL_CIPHER_C)
|
|
|
|
#include "polarssl/cipher.h"
|
|
#include "polarssl/cipher_wrap.h"
|
|
|
|
#include <stdlib.h>
|
|
|
|
#if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER)
|
|
#define POLARSSL_CIPHER_MODE_STREAM
|
|
#endif
|
|
|
|
#if defined _MSC_VER && !defined strcasecmp
|
|
#define strcasecmp _stricmp
|
|
#endif
|
|
|
|
static const int supported_ciphers[] = {
|
|
|
|
#if defined(POLARSSL_AES_C)
|
|
POLARSSL_CIPHER_AES_128_CBC,
|
|
POLARSSL_CIPHER_AES_192_CBC,
|
|
POLARSSL_CIPHER_AES_256_CBC,
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
POLARSSL_CIPHER_AES_128_CFB128,
|
|
POLARSSL_CIPHER_AES_192_CFB128,
|
|
POLARSSL_CIPHER_AES_256_CFB128,
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
POLARSSL_CIPHER_AES_128_CTR,
|
|
POLARSSL_CIPHER_AES_192_CTR,
|
|
POLARSSL_CIPHER_AES_256_CTR,
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
|
|
#endif /* defined(POLARSSL_AES_C) */
|
|
|
|
#if defined(POLARSSL_ARC4_C)
|
|
POLARSSL_CIPHER_ARC4_128,
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
POLARSSL_CIPHER_CAMELLIA_128_CBC,
|
|
POLARSSL_CIPHER_CAMELLIA_192_CBC,
|
|
POLARSSL_CIPHER_CAMELLIA_256_CBC,
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
POLARSSL_CIPHER_CAMELLIA_128_CFB128,
|
|
POLARSSL_CIPHER_CAMELLIA_192_CFB128,
|
|
POLARSSL_CIPHER_CAMELLIA_256_CFB128,
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
POLARSSL_CIPHER_CAMELLIA_128_CTR,
|
|
POLARSSL_CIPHER_CAMELLIA_192_CTR,
|
|
POLARSSL_CIPHER_CAMELLIA_256_CTR,
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
|
|
#endif /* defined(POLARSSL_CAMELLIA_C) */
|
|
|
|
#if defined(POLARSSL_DES_C)
|
|
POLARSSL_CIPHER_DES_CBC,
|
|
POLARSSL_CIPHER_DES_EDE_CBC,
|
|
POLARSSL_CIPHER_DES_EDE3_CBC,
|
|
#endif /* defined(POLARSSL_DES_C) */
|
|
|
|
#if defined(POLARSSL_BLOWFISH_C)
|
|
POLARSSL_CIPHER_BLOWFISH_CBC,
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
POLARSSL_CIPHER_BLOWFISH_CFB64,
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
POLARSSL_CIPHER_BLOWFISH_CTR,
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
|
|
#endif /* defined(POLARSSL_BLOWFISH_C) */
|
|
|
|
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
|
|
POLARSSL_CIPHER_NULL,
|
|
#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
|
|
|
|
0
|
|
};
|
|
|
|
const int *cipher_list( void )
|
|
{
|
|
return supported_ciphers;
|
|
}
|
|
|
|
const cipher_info_t *cipher_info_from_type( const cipher_type_t cipher_type )
|
|
{
|
|
/* Find static cipher information */
|
|
switch ( cipher_type )
|
|
{
|
|
#if defined(POLARSSL_AES_C)
|
|
case POLARSSL_CIPHER_AES_128_CBC:
|
|
return &aes_128_cbc_info;
|
|
case POLARSSL_CIPHER_AES_192_CBC:
|
|
return &aes_192_cbc_info;
|
|
case POLARSSL_CIPHER_AES_256_CBC:
|
|
return &aes_256_cbc_info;
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
case POLARSSL_CIPHER_AES_128_CFB128:
|
|
return &aes_128_cfb128_info;
|
|
case POLARSSL_CIPHER_AES_192_CFB128:
|
|
return &aes_192_cfb128_info;
|
|
case POLARSSL_CIPHER_AES_256_CFB128:
|
|
return &aes_256_cfb128_info;
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
case POLARSSL_CIPHER_AES_128_CTR:
|
|
return &aes_128_ctr_info;
|
|
case POLARSSL_CIPHER_AES_192_CTR:
|
|
return &aes_192_ctr_info;
|
|
case POLARSSL_CIPHER_AES_256_CTR:
|
|
return &aes_256_ctr_info;
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
|
|
#if defined(POLARSSL_GCM_C)
|
|
case POLARSSL_CIPHER_AES_128_GCM:
|
|
return &aes_128_gcm_info;
|
|
case POLARSSL_CIPHER_AES_256_GCM:
|
|
return &aes_256_gcm_info;
|
|
#endif /* defined(POLARSSL_GCM_C) */
|
|
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
case POLARSSL_CIPHER_CAMELLIA_128_CBC:
|
|
return &camellia_128_cbc_info;
|
|
case POLARSSL_CIPHER_CAMELLIA_192_CBC:
|
|
return &camellia_192_cbc_info;
|
|
case POLARSSL_CIPHER_CAMELLIA_256_CBC:
|
|
return &camellia_256_cbc_info;
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
case POLARSSL_CIPHER_CAMELLIA_128_CFB128:
|
|
return &camellia_128_cfb128_info;
|
|
case POLARSSL_CIPHER_CAMELLIA_192_CFB128:
|
|
return &camellia_192_cfb128_info;
|
|
case POLARSSL_CIPHER_CAMELLIA_256_CFB128:
|
|
return &camellia_256_cfb128_info;
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
case POLARSSL_CIPHER_CAMELLIA_128_CTR:
|
|
return &camellia_128_ctr_info;
|
|
case POLARSSL_CIPHER_CAMELLIA_192_CTR:
|
|
return &camellia_192_ctr_info;
|
|
case POLARSSL_CIPHER_CAMELLIA_256_CTR:
|
|
return &camellia_256_ctr_info;
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
|
|
#endif
|
|
|
|
#if defined(POLARSSL_DES_C)
|
|
case POLARSSL_CIPHER_DES_CBC:
|
|
return &des_cbc_info;
|
|
case POLARSSL_CIPHER_DES_EDE_CBC:
|
|
return &des_ede_cbc_info;
|
|
case POLARSSL_CIPHER_DES_EDE3_CBC:
|
|
return &des_ede3_cbc_info;
|
|
#endif
|
|
|
|
#if defined(POLARSSL_ARC4_C)
|
|
case POLARSSL_CIPHER_ARC4_128:
|
|
return &arc4_128_info;
|
|
#endif
|
|
|
|
#if defined(POLARSSL_BLOWFISH_C)
|
|
case POLARSSL_CIPHER_BLOWFISH_CBC:
|
|
return &blowfish_cbc_info;
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
case POLARSSL_CIPHER_BLOWFISH_CFB64:
|
|
return &blowfish_cfb64_info;
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
case POLARSSL_CIPHER_BLOWFISH_CTR:
|
|
return &blowfish_ctr_info;
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
|
|
case POLARSSL_CIPHER_NULL:
|
|
return &null_cipher_info;
|
|
#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
const cipher_info_t *cipher_info_from_string( const char *cipher_name )
|
|
{
|
|
if( NULL == cipher_name )
|
|
return NULL;
|
|
|
|
/* Get the appropriate cipher information */
|
|
#if defined(POLARSSL_CAMELLIA_C)
|
|
if( !strcasecmp( "CAMELLIA-128-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_128_CBC );
|
|
if( !strcasecmp( "CAMELLIA-192-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_192_CBC );
|
|
if( !strcasecmp( "CAMELLIA-256-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_256_CBC );
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
if( !strcasecmp( "CAMELLIA-128-CFB128", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_128_CFB128 );
|
|
if( !strcasecmp( "CAMELLIA-192-CFB128", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_192_CFB128 );
|
|
if( !strcasecmp( "CAMELLIA-256-CFB128", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_256_CFB128 );
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
if( !strcasecmp( "CAMELLIA-128-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_128_CTR );
|
|
if( !strcasecmp( "CAMELLIA-192-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_192_CTR );
|
|
if( !strcasecmp( "CAMELLIA-256-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_CAMELLIA_256_CTR );
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
#endif
|
|
|
|
#if defined(POLARSSL_AES_C)
|
|
if( !strcasecmp( "AES-128-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_128_CBC );
|
|
if( !strcasecmp( "AES-192-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_192_CBC );
|
|
if( !strcasecmp( "AES-256-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_256_CBC );
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
if( !strcasecmp( "AES-128-CFB128", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_128_CFB128 );
|
|
if( !strcasecmp( "AES-192-CFB128", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_192_CFB128 );
|
|
if( !strcasecmp( "AES-256-CFB128", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_256_CFB128 );
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
if( !strcasecmp( "AES-128-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_128_CTR );
|
|
if( !strcasecmp( "AES-192-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_192_CTR );
|
|
if( !strcasecmp( "AES-256-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_AES_256_CTR );
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
#endif
|
|
|
|
#if defined(POLARSSL_ARC4_C)
|
|
if( !strcasecmp( "ARC4-128", cipher_name ) )
|
|
return( cipher_info_from_type( POLARSSL_CIPHER_ARC4_128 ) );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_DES_C)
|
|
if( !strcasecmp( "DES-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_DES_CBC );
|
|
if( !strcasecmp( "DES-EDE-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_DES_EDE_CBC );
|
|
if( !strcasecmp( "DES-EDE3-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_DES_EDE3_CBC );
|
|
#endif
|
|
|
|
#if defined(POLARSSL_BLOWFISH_C)
|
|
if( !strcasecmp( "BLOWFISH-CBC", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_BLOWFISH_CBC );
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
if( !strcasecmp( "BLOWFISH-CFB64", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_BLOWFISH_CFB64 );
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
if( !strcasecmp( "BLOWFISH-CTR", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_BLOWFISH_CTR );
|
|
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
|
|
if( !strcasecmp( "NULL", cipher_name ) )
|
|
return cipher_info_from_type( POLARSSL_CIPHER_NULL );
|
|
#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info )
|
|
{
|
|
if( NULL == cipher_info || NULL == ctx )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
memset( ctx, 0, sizeof( cipher_context_t ) );
|
|
|
|
if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
|
|
return POLARSSL_ERR_CIPHER_ALLOC_FAILED;
|
|
|
|
ctx->cipher_info = cipher_info;
|
|
|
|
/*
|
|
* Ignore possible errors caused by a cipher mode that doesn't use padding
|
|
*/
|
|
#if defined(POLARSSL_CIPHER_PADDING_PKCS7)
|
|
(void) cipher_set_padding_mode( ctx, POLARSSL_PADDING_PKCS7 );
|
|
#else
|
|
(void) cipher_set_padding_mode( ctx, POLARSSL_PADDING_NONE );
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cipher_free_ctx( cipher_context_t *ctx )
|
|
{
|
|
if( ctx == NULL || ctx->cipher_info == NULL )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx );
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cipher_setkey( cipher_context_t *ctx, const unsigned char *key,
|
|
int key_length, const operation_t operation )
|
|
{
|
|
if( NULL == ctx || NULL == ctx->cipher_info )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
ctx->key_length = key_length;
|
|
ctx->operation = operation;
|
|
|
|
/*
|
|
* For CFB and CTR mode always use the encryption key schedule
|
|
*/
|
|
if( POLARSSL_ENCRYPT == operation ||
|
|
POLARSSL_MODE_CFB == ctx->cipher_info->mode ||
|
|
POLARSSL_MODE_CTR == ctx->cipher_info->mode )
|
|
{
|
|
return ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key,
|
|
ctx->key_length );
|
|
}
|
|
|
|
if( POLARSSL_DECRYPT == operation )
|
|
return ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key,
|
|
ctx->key_length );
|
|
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
}
|
|
|
|
int cipher_reset( cipher_context_t *ctx, const unsigned char *iv )
|
|
{
|
|
if( NULL == ctx || NULL == ctx->cipher_info || NULL == iv )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
ctx->unprocessed_len = 0;
|
|
|
|
memcpy( ctx->iv, iv, cipher_get_iv_size( ctx ) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ilen,
|
|
unsigned char *output, size_t *olen )
|
|
{
|
|
int ret;
|
|
size_t copy_len = 0;
|
|
|
|
*olen = 0;
|
|
|
|
if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
|
|
{
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
}
|
|
|
|
if( input == output &&
|
|
( ctx->unprocessed_len != 0 || ilen % cipher_get_block_size( ctx ) ) )
|
|
{
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
}
|
|
|
|
if( ctx->cipher_info->mode == POLARSSL_MODE_CBC )
|
|
{
|
|
/*
|
|
* If there is not enough data for a full block, cache it.
|
|
*/
|
|
if( ( ctx->operation == POLARSSL_DECRYPT &&
|
|
ilen + ctx->unprocessed_len <= cipher_get_block_size( ctx ) ) ||
|
|
( ctx->operation == POLARSSL_ENCRYPT &&
|
|
ilen + ctx->unprocessed_len < cipher_get_block_size( ctx ) ) )
|
|
{
|
|
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
|
|
ilen );
|
|
|
|
ctx->unprocessed_len += ilen;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Process cached data first
|
|
*/
|
|
if( ctx->unprocessed_len != 0 )
|
|
{
|
|
copy_len = cipher_get_block_size( ctx ) - ctx->unprocessed_len;
|
|
|
|
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
|
|
copy_len );
|
|
|
|
if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
|
|
ctx->operation, cipher_get_block_size( ctx ), ctx->iv,
|
|
ctx->unprocessed_data, output ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
*olen += cipher_get_block_size( ctx );
|
|
output += cipher_get_block_size( ctx );
|
|
ctx->unprocessed_len = 0;
|
|
|
|
input += copy_len;
|
|
ilen -= copy_len;
|
|
}
|
|
|
|
/*
|
|
* Cache final, incomplete block
|
|
*/
|
|
if( 0 != ilen )
|
|
{
|
|
copy_len = ilen % cipher_get_block_size( ctx );
|
|
if( copy_len == 0 && ctx->operation == POLARSSL_DECRYPT )
|
|
copy_len = cipher_get_block_size(ctx);
|
|
|
|
memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ),
|
|
copy_len );
|
|
|
|
ctx->unprocessed_len += copy_len;
|
|
ilen -= copy_len;
|
|
}
|
|
|
|
/*
|
|
* Process remaining full blocks
|
|
*/
|
|
if( ilen )
|
|
{
|
|
if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
|
|
ctx->operation, ilen, ctx->iv, input, output ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
*olen += ilen;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CFB)
|
|
if( ctx->cipher_info->mode == POLARSSL_MODE_CFB )
|
|
{
|
|
if( 0 != ( ret = ctx->cipher_info->base->cfb_func( ctx->cipher_ctx,
|
|
ctx->operation, ilen, &ctx->unprocessed_len, ctx->iv,
|
|
input, output ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
*olen = ilen;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_CTR)
|
|
if( ctx->cipher_info->mode == POLARSSL_MODE_CTR )
|
|
{
|
|
if( 0 != ( ret = ctx->cipher_info->base->ctr_func( ctx->cipher_ctx,
|
|
ilen, &ctx->unprocessed_len, ctx->iv,
|
|
ctx->unprocessed_data, input, output ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
*olen = ilen;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if defined(POLARSSL_CIPHER_MODE_STREAM)
|
|
if( ctx->cipher_info->mode == POLARSSL_MODE_STREAM )
|
|
{
|
|
if( 0 != ( ret = ctx->cipher_info->base->stream_func( ctx->cipher_ctx,
|
|
ilen, input, output ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
*olen = ilen;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
}
|
|
|
|
#if defined(POLARSSL_CIPHER_PADDING_PKCS7)
|
|
/*
|
|
* PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len
|
|
*/
|
|
static void add_pkcs_padding( unsigned char *output, size_t output_len,
|
|
size_t data_len )
|
|
{
|
|
size_t padding_len = output_len - data_len;
|
|
unsigned char i = 0;
|
|
|
|
for( i = 0; i < padding_len; i++ )
|
|
output[data_len + i] = (unsigned char) padding_len;
|
|
}
|
|
|
|
static int get_pkcs_padding( unsigned char *input, size_t input_len,
|
|
size_t *data_len )
|
|
{
|
|
unsigned int i, padding_len = 0;
|
|
|
|
if( NULL == input || NULL == data_len )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
padding_len = input[input_len - 1];
|
|
|
|
if( padding_len > input_len || padding_len == 0 )
|
|
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
|
|
|
|
for( i = input_len - padding_len; i < input_len; i++ )
|
|
if( input[i] != padding_len )
|
|
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
|
|
|
|
*data_len = input_len - padding_len;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* POLARSSL_CIPHER_PADDING_PKCS7 */
|
|
|
|
#if defined(POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS)
|
|
/*
|
|
* One and zeros padding: fill with 80 00 ... 00
|
|
*/
|
|
static void add_one_and_zeros_padding( unsigned char *output,
|
|
size_t output_len, size_t data_len )
|
|
{
|
|
size_t padding_len = output_len - data_len;
|
|
unsigned char i = 0;
|
|
|
|
output[data_len] = 0x80;
|
|
for( i = 1; i < padding_len; i++ )
|
|
output[data_len + i] = 0x00;
|
|
}
|
|
|
|
static int get_one_and_zeros_padding( unsigned char *input, size_t input_len,
|
|
size_t *data_len )
|
|
{
|
|
unsigned char *p = input + input_len - 1;
|
|
|
|
if( NULL == input || NULL == data_len )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
while( *p == 0x00 && p > input )
|
|
--p;
|
|
|
|
if( *p != 0x80 )
|
|
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
|
|
|
|
*data_len = p - input;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS */
|
|
|
|
#if defined(POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN)
|
|
/*
|
|
* Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length
|
|
*/
|
|
static void add_zeros_and_len_padding( unsigned char *output,
|
|
size_t output_len, size_t data_len )
|
|
{
|
|
size_t padding_len = output_len - data_len;
|
|
unsigned char i = 0;
|
|
|
|
for( i = 1; i < padding_len; i++ )
|
|
output[data_len + i - 1] = 0x00;
|
|
output[output_len - 1] = (unsigned char) padding_len;
|
|
}
|
|
|
|
static int get_zeros_and_len_padding( unsigned char *input, size_t input_len,
|
|
size_t *data_len )
|
|
{
|
|
unsigned int i, padding_len = 0;
|
|
|
|
if( NULL == input || NULL == data_len )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
padding_len = input[input_len - 1];
|
|
|
|
if( padding_len > input_len || padding_len == 0 )
|
|
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
|
|
|
|
for( i = input_len - padding_len; i < input_len - 1; i++ )
|
|
if( input[i] != 0x00 )
|
|
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
|
|
|
|
*data_len = input_len - padding_len;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN */
|
|
|
|
#if defined(POLARSSL_CIPHER_PADDING_ZEROS)
|
|
/*
|
|
* Zero padding: fill with 00 ... 00
|
|
*/
|
|
static void add_zeros_padding( unsigned char *output,
|
|
size_t output_len, size_t data_len )
|
|
{
|
|
unsigned char i;
|
|
|
|
for( i = data_len; i < output_len; i++ )
|
|
output[i] = 0x00;
|
|
}
|
|
|
|
static int get_zeros_padding( unsigned char *input, size_t input_len,
|
|
size_t *data_len )
|
|
{
|
|
unsigned char *p = input + input_len - 1;
|
|
if( NULL == input || NULL == data_len )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
while( *p == 0x00 && p > input )
|
|
--p;
|
|
|
|
*data_len = *p == 0x00 ? 0 : p - input + 1;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* POLARSSL_CIPHER_PADDING_ZEROS */
|
|
|
|
/*
|
|
* No padding: don't pad :)
|
|
*
|
|
* There is no add_padding function (check for NULL in cipher_finish)
|
|
* but a trivial get_padding function
|
|
*/
|
|
static int get_no_padding( unsigned char *input, size_t input_len,
|
|
size_t *data_len )
|
|
{
|
|
if( NULL == input || NULL == data_len )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
*data_len = input_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cipher_finish( cipher_context_t *ctx, unsigned char *output, size_t *olen)
|
|
{
|
|
int ret = 0;
|
|
|
|
if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
|
|
*olen = 0;
|
|
|
|
if( POLARSSL_MODE_CFB == ctx->cipher_info->mode ||
|
|
POLARSSL_MODE_CTR == ctx->cipher_info->mode ||
|
|
POLARSSL_MODE_STREAM == ctx->cipher_info->mode )
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
if( POLARSSL_MODE_CBC == ctx->cipher_info->mode )
|
|
{
|
|
if( POLARSSL_ENCRYPT == ctx->operation )
|
|
{
|
|
/* check for 'no padding' mode */
|
|
if( NULL == ctx->add_padding )
|
|
{
|
|
if( 0 != ctx->unprocessed_len )
|
|
return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED;
|
|
|
|
return 0;
|
|
}
|
|
|
|
ctx->add_padding( ctx->unprocessed_data, cipher_get_iv_size( ctx ),
|
|
ctx->unprocessed_len );
|
|
}
|
|
else if ( cipher_get_block_size( ctx ) != ctx->unprocessed_len )
|
|
{
|
|
/*
|
|
* For decrypt operations, expect a full block,
|
|
* or an empty block if no padding
|
|
*/
|
|
if( NULL == ctx->add_padding && 0 == ctx->unprocessed_len )
|
|
return 0;
|
|
|
|
return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED;
|
|
}
|
|
|
|
/* cipher block */
|
|
if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
|
|
ctx->operation, cipher_get_block_size( ctx ), ctx->iv,
|
|
ctx->unprocessed_data, output ) ) )
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Set output size for decryption */
|
|
if( POLARSSL_DECRYPT == ctx->operation )
|
|
return ctx->get_padding( output, cipher_get_block_size( ctx ),
|
|
olen );
|
|
|
|
/* Set output size for encryption */
|
|
*olen = cipher_get_block_size( ctx );
|
|
return 0;
|
|
}
|
|
|
|
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
}
|
|
|
|
int cipher_set_padding_mode( cipher_context_t *ctx, cipher_padding_t mode )
|
|
{
|
|
if( NULL == ctx ||
|
|
POLARSSL_MODE_CBC != ctx->cipher_info->mode )
|
|
{
|
|
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
|
|
}
|
|
|
|
switch( mode )
|
|
{
|
|
#if defined(POLARSSL_CIPHER_PADDING_PKCS7)
|
|
case POLARSSL_PADDING_PKCS7:
|
|
ctx->add_padding = add_pkcs_padding;
|
|
ctx->get_padding = get_pkcs_padding;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS)
|
|
case POLARSSL_PADDING_ONE_AND_ZEROS:
|
|
ctx->add_padding = add_one_and_zeros_padding;
|
|
ctx->get_padding = get_one_and_zeros_padding;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN)
|
|
case POLARSSL_PADDING_ZEROS_AND_LEN:
|
|
ctx->add_padding = add_zeros_and_len_padding;
|
|
ctx->get_padding = get_zeros_and_len_padding;
|
|
break;
|
|
#endif
|
|
#if defined(POLARSSL_CIPHER_PADDING_ZEROS)
|
|
case POLARSSL_PADDING_ZEROS:
|
|
ctx->add_padding = add_zeros_padding;
|
|
ctx->get_padding = get_zeros_padding;
|
|
break;
|
|
#endif
|
|
case POLARSSL_PADDING_NONE:
|
|
ctx->add_padding = NULL;
|
|
ctx->get_padding = get_no_padding;
|
|
break;
|
|
|
|
default:
|
|
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(POLARSSL_SELF_TEST)
|
|
|
|
#include <stdio.h>
|
|
|
|
#define ASSERT(x) if (!(x)) { \
|
|
printf( "failed with %i at %s\n", value, (#x) ); \
|
|
return( 1 ); \
|
|
}
|
|
/*
|
|
* Checkup routine
|
|
*/
|
|
|
|
int cipher_self_test( int verbose )
|
|
{
|
|
((void) verbose);
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|