+++ /dev/null
-/**
- * \file cipher.c
- *
- * \brief Generic cipher wrapper for mbed TLS
- *
- * \author Adriaan de Jong <dejong@fox-it.com>
- *
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: GPL-2.0
- *
- * 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.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#if defined(MBEDTLS_CIPHER_C)
-
-#include "mbedtls/cipher.h"
-#include "mbedtls/cipher_internal.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-#if defined(MBEDTLS_GCM_C)
-#include "mbedtls/gcm.h"
-#endif
-
-#if defined(MBEDTLS_CCM_C)
-#include "mbedtls/ccm.h"
-#endif
-
-#if defined(MBEDTLS_CMAC_C)
-#include "mbedtls/cmac.h"
-#endif
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#define mbedtls_calloc calloc
-#define mbedtls_free free
-#endif
-
-#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
-#define MBEDTLS_CIPHER_MODE_STREAM
-#endif
-
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
- volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
-}
-
-static int supported_init = 0;
-
-const int *mbedtls_cipher_list( void )
-{
- const mbedtls_cipher_definition_t *def;
- int *type;
-
- if( ! supported_init )
- {
- def = mbedtls_cipher_definitions;
- type = mbedtls_cipher_supported;
-
- while( def->type != 0 )
- *type++ = (*def++).type;
-
- *type = 0;
-
- supported_init = 1;
- }
-
- return( mbedtls_cipher_supported );
-}
-
-const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type )
-{
- const mbedtls_cipher_definition_t *def;
-
- for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
- if( def->type == cipher_type )
- return( def->info );
-
- return( NULL );
-}
-
-const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name )
-{
- const mbedtls_cipher_definition_t *def;
-
- if( NULL == cipher_name )
- return( NULL );
-
- for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
- if( ! strcmp( def->info->name, cipher_name ) )
- return( def->info );
-
- return( NULL );
-}
-
-const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( const mbedtls_cipher_id_t cipher_id,
- int key_bitlen,
- const mbedtls_cipher_mode_t mode )
-{
- const mbedtls_cipher_definition_t *def;
-
- for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
- if( def->info->base->cipher == cipher_id &&
- def->info->key_bitlen == (unsigned) key_bitlen &&
- def->info->mode == mode )
- return( def->info );
-
- return( NULL );
-}
-
-void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx )
-{
- memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
-}
-
-void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx )
-{
- if( ctx == NULL )
- return;
-
-#if defined(MBEDTLS_CMAC_C)
- if( ctx->cmac_ctx )
- {
- mbedtls_zeroize( ctx->cmac_ctx, sizeof( mbedtls_cmac_context_t ) );
- mbedtls_free( ctx->cmac_ctx );
- }
-#endif
-
- if( ctx->cipher_ctx )
- ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx );
-
- mbedtls_zeroize( ctx, sizeof(mbedtls_cipher_context_t) );
-}
-
-int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx, const mbedtls_cipher_info_t *cipher_info )
-{
- if( NULL == cipher_info || NULL == ctx )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
-
- if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
- return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
-
- ctx->cipher_info = cipher_info;
-
-#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
- /*
- * Ignore possible errors caused by a cipher mode that doesn't use padding
- */
-#if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
- (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_PKCS7 );
-#else
- (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_NONE );
-#endif
-#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
-
- return( 0 );
-}
-
-int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *key,
- int key_bitlen, const mbedtls_operation_t operation )
-{
- if( NULL == ctx || NULL == ctx->cipher_info )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN ) == 0 &&
- (int) ctx->cipher_info->key_bitlen != key_bitlen )
- {
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
- ctx->key_bitlen = key_bitlen;
- ctx->operation = operation;
-
- /*
- * For CFB and CTR mode always use the encryption key schedule
- */
- if( MBEDTLS_ENCRYPT == operation ||
- MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
- MBEDTLS_MODE_CTR == ctx->cipher_info->mode )
- {
- return ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key,
- ctx->key_bitlen );
- }
-
- if( MBEDTLS_DECRYPT == operation )
- return ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key,
- ctx->key_bitlen );
-
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-}
-
-int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
- const unsigned char *iv, size_t iv_len )
-{
- size_t actual_iv_size;
-
- if( NULL == ctx || NULL == ctx->cipher_info || NULL == iv )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- /* avoid buffer overflow in ctx->iv */
- if( iv_len > MBEDTLS_MAX_IV_LENGTH )
- return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
-
- if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN ) != 0 )
- actual_iv_size = iv_len;
- else
- {
- actual_iv_size = ctx->cipher_info->iv_size;
-
- /* avoid reading past the end of input buffer */
- if( actual_iv_size > iv_len )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
- memcpy( ctx->iv, iv, actual_iv_size );
- ctx->iv_size = actual_iv_size;
-
- return( 0 );
-}
-
-int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx )
-{
- if( NULL == ctx || NULL == ctx->cipher_info )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- ctx->unprocessed_len = 0;
-
- return( 0 );
-}
-
-#if defined(MBEDTLS_GCM_C)
-int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
- const unsigned char *ad, size_t ad_len )
-{
- if( NULL == ctx || NULL == ctx->cipher_info )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
- {
- return mbedtls_gcm_starts( (mbedtls_gcm_context *) ctx->cipher_ctx, ctx->operation,
- ctx->iv, ctx->iv_size, ad, ad_len );
- }
-
- return( 0 );
-}
-#endif /* MBEDTLS_GCM_C */
-
-int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input,
- size_t ilen, unsigned char *output, size_t *olen )
-{
- int ret;
- size_t block_size = 0;
-
- if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
- {
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
- *olen = 0;
- block_size = mbedtls_cipher_get_block_size( ctx );
-
- if( ctx->cipher_info->mode == MBEDTLS_MODE_ECB )
- {
- if( ilen != block_size )
- return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
-
- *olen = ilen;
-
- if( 0 != ( ret = ctx->cipher_info->base->ecb_func( ctx->cipher_ctx,
- ctx->operation, input, output ) ) )
- {
- return( ret );
- }
-
- return( 0 );
- }
-
-#if defined(MBEDTLS_GCM_C)
- if( ctx->cipher_info->mode == MBEDTLS_MODE_GCM )
- {
- *olen = ilen;
- return mbedtls_gcm_update( (mbedtls_gcm_context *) ctx->cipher_ctx, ilen, input,
- output );
- }
-#endif
-
- if ( 0 == block_size )
- {
- return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
- }
-
- if( input == output &&
- ( ctx->unprocessed_len != 0 || ilen % block_size ) )
- {
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
-#if defined(MBEDTLS_CIPHER_MODE_CBC)
- if( ctx->cipher_info->mode == MBEDTLS_MODE_CBC )
- {
- size_t copy_len = 0;
-
- /*
- * If there is not enough data for a full block, cache it.
- */
- if( ( ctx->operation == MBEDTLS_DECRYPT &&
- ilen <= block_size - ctx->unprocessed_len ) ||
- ( ctx->operation == MBEDTLS_ENCRYPT &&
- ilen < block_size - ctx->unprocessed_len ) )
- {
- memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
- ilen );
-
- ctx->unprocessed_len += ilen;
- return( 0 );
- }
-
- /*
- * Process cached data first
- */
- if( 0 != ctx->unprocessed_len )
- {
- copy_len = block_size - 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, block_size, ctx->iv,
- ctx->unprocessed_data, output ) ) )
- {
- return( ret );
- }
-
- *olen += block_size;
- output += block_size;
- ctx->unprocessed_len = 0;
-
- input += copy_len;
- ilen -= copy_len;
- }
-
- /*
- * Cache final, incomplete block
- */
- if( 0 != ilen )
- {
- if( 0 == block_size )
- {
- return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
- }
-
- copy_len = ilen % block_size;
- if( copy_len == 0 && ctx->operation == MBEDTLS_DECRYPT )
- copy_len = block_size;
-
- 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 );
- }
-#endif /* MBEDTLS_CIPHER_MODE_CBC */
-
-#if defined(MBEDTLS_CIPHER_MODE_CFB)
- if( ctx->cipher_info->mode == MBEDTLS_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 /* MBEDTLS_CIPHER_MODE_CFB */
-
-#if defined(MBEDTLS_CIPHER_MODE_CTR)
- if( ctx->cipher_info->mode == MBEDTLS_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 /* MBEDTLS_CIPHER_MODE_CTR */
-
-#if defined(MBEDTLS_CIPHER_MODE_STREAM)
- if( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM )
- {
- if( 0 != ( ret = ctx->cipher_info->base->stream_func( ctx->cipher_ctx,
- ilen, input, output ) ) )
- {
- return( ret );
- }
-
- *olen = ilen;
-
- return( 0 );
- }
-#endif /* MBEDTLS_CIPHER_MODE_STREAM */
-
- return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
-}
-
-#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
-#if defined(MBEDTLS_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;
-
- 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 )
-{
- size_t i, pad_idx;
- unsigned char padding_len, bad = 0;
-
- if( NULL == input || NULL == data_len )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- padding_len = input[input_len - 1];
- *data_len = input_len - padding_len;
-
- /* Avoid logical || since it results in a branch */
- bad |= padding_len > input_len;
- bad |= padding_len == 0;
-
- /* The number of bytes checked must be independent of padding_len,
- * so pick input_len, which is usually 8 or 16 (one block) */
- pad_idx = input_len - padding_len;
- for( i = 0; i < input_len; i++ )
- bad |= ( input[i] ^ padding_len ) * ( i >= pad_idx );
-
- return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
-}
-#endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */
-
-#if defined(MBEDTLS_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 )
-{
- size_t i;
- unsigned char done = 0, prev_done, bad;
-
- if( NULL == input || NULL == data_len )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- bad = 0xFF;
- *data_len = 0;
- for( i = input_len; i > 0; i-- )
- {
- prev_done = done;
- done |= ( input[i-1] != 0 );
- *data_len |= ( i - 1 ) * ( done != prev_done );
- bad &= ( input[i-1] ^ 0x80 ) | ( done == prev_done );
- }
-
- return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
-
-}
-#endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */
-
-#if defined(MBEDTLS_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 )
-{
- size_t i, pad_idx;
- unsigned char padding_len, bad = 0;
-
- if( NULL == input || NULL == data_len )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- padding_len = input[input_len - 1];
- *data_len = input_len - padding_len;
-
- /* Avoid logical || since it results in a branch */
- bad |= padding_len > input_len;
- bad |= padding_len == 0;
-
- /* The number of bytes checked must be independent of padding_len */
- pad_idx = input_len - padding_len;
- for( i = 0; i < input_len - 1; i++ )
- bad |= input[i] * ( i >= pad_idx );
-
- return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
-}
-#endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */
-
-#if defined(MBEDTLS_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 )
-{
- size_t 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 )
-{
- size_t i;
- unsigned char done = 0, prev_done;
-
- if( NULL == input || NULL == data_len )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- *data_len = 0;
- for( i = input_len; i > 0; i-- )
- {
- prev_done = done;
- done |= ( input[i-1] != 0 );
- *data_len |= i * ( done != prev_done );
- }
-
- return( 0 );
-}
-#endif /* MBEDTLS_CIPHER_PADDING_ZEROS */
-
-/*
- * No padding: don't pad :)
- *
- * There is no add_padding function (check for NULL in mbedtls_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( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- *data_len = input_len;
-
- return( 0 );
-}
-#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
-
-int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
- unsigned char *output, size_t *olen )
-{
- if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- *olen = 0;
-
- if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
- MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
- MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
- MBEDTLS_MODE_STREAM == ctx->cipher_info->mode )
- {
- return( 0 );
- }
-
- if( MBEDTLS_MODE_ECB == ctx->cipher_info->mode )
- {
- if( ctx->unprocessed_len != 0 )
- return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
-
- return( 0 );
- }
-
-#if defined(MBEDTLS_CIPHER_MODE_CBC)
- if( MBEDTLS_MODE_CBC == ctx->cipher_info->mode )
- {
- int ret = 0;
-
- if( MBEDTLS_ENCRYPT == ctx->operation )
- {
- /* check for 'no padding' mode */
- if( NULL == ctx->add_padding )
- {
- if( 0 != ctx->unprocessed_len )
- return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
-
- return( 0 );
- }
-
- ctx->add_padding( ctx->unprocessed_data, mbedtls_cipher_get_iv_size( ctx ),
- ctx->unprocessed_len );
- }
- else if( mbedtls_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( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
- }
-
- /* cipher block */
- if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
- ctx->operation, mbedtls_cipher_get_block_size( ctx ), ctx->iv,
- ctx->unprocessed_data, output ) ) )
- {
- return( ret );
- }
-
- /* Set output size for decryption */
- if( MBEDTLS_DECRYPT == ctx->operation )
- return ctx->get_padding( output, mbedtls_cipher_get_block_size( ctx ),
- olen );
-
- /* Set output size for encryption */
- *olen = mbedtls_cipher_get_block_size( ctx );
- return( 0 );
- }
-#else
- ((void) output);
-#endif /* MBEDTLS_CIPHER_MODE_CBC */
-
- return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
-}
-
-#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
-int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx, mbedtls_cipher_padding_t mode )
-{
- if( NULL == ctx ||
- MBEDTLS_MODE_CBC != ctx->cipher_info->mode )
- {
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
- switch( mode )
- {
-#if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
- case MBEDTLS_PADDING_PKCS7:
- ctx->add_padding = add_pkcs_padding;
- ctx->get_padding = get_pkcs_padding;
- break;
-#endif
-#if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
- case MBEDTLS_PADDING_ONE_AND_ZEROS:
- ctx->add_padding = add_one_and_zeros_padding;
- ctx->get_padding = get_one_and_zeros_padding;
- break;
-#endif
-#if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
- case MBEDTLS_PADDING_ZEROS_AND_LEN:
- ctx->add_padding = add_zeros_and_len_padding;
- ctx->get_padding = get_zeros_and_len_padding;
- break;
-#endif
-#if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
- case MBEDTLS_PADDING_ZEROS:
- ctx->add_padding = add_zeros_padding;
- ctx->get_padding = get_zeros_padding;
- break;
-#endif
- case MBEDTLS_PADDING_NONE:
- ctx->add_padding = NULL;
- ctx->get_padding = get_no_padding;
- break;
-
- default:
- return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
- }
-
- return( 0 );
-}
-#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
-
-#if defined(MBEDTLS_GCM_C)
-int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
- unsigned char *tag, size_t tag_len )
-{
- if( NULL == ctx || NULL == ctx->cipher_info || NULL == tag )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- if( MBEDTLS_ENCRYPT != ctx->operation )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
- return mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx, tag, tag_len );
-
- return( 0 );
-}
-
-int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
- const unsigned char *tag, size_t tag_len )
-{
- int ret;
-
- if( NULL == ctx || NULL == ctx->cipher_info ||
- MBEDTLS_DECRYPT != ctx->operation )
- {
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
- }
-
- if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
- {
- unsigned char check_tag[16];
- size_t i;
- int diff;
-
- if( tag_len > sizeof( check_tag ) )
- return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
-
- if( 0 != ( ret = mbedtls_gcm_finish( (mbedtls_gcm_context *) 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( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
-
- return( 0 );
- }
-
- return( 0 );
-}
-#endif /* MBEDTLS_GCM_C */
-
-/*
- * Packet-oriented wrapper for non-AEAD modes
- */
-int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx,
- const unsigned char *iv, size_t iv_len,
- const unsigned char *input, size_t ilen,
- unsigned char *output, size_t *olen )
-{
- int ret;
- size_t finish_olen;
-
- if( ( ret = mbedtls_cipher_set_iv( ctx, iv, iv_len ) ) != 0 )
- return( ret );
-
- if( ( ret = mbedtls_cipher_reset( ctx ) ) != 0 )
- return( ret );
-
- if( ( ret = mbedtls_cipher_update( ctx, input, ilen, output, olen ) ) != 0 )
- return( ret );
-
- if( ( ret = mbedtls_cipher_finish( ctx, output + *olen, &finish_olen ) ) != 0 )
- return( ret );
-
- *olen += finish_olen;
-
- return( 0 );
-}
-
-#if defined(MBEDTLS_CIPHER_MODE_AEAD)
-/*
- * Packet-oriented encryption for AEAD modes
- */
-int mbedtls_cipher_auth_encrypt( mbedtls_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(MBEDTLS_GCM_C)
- if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
- {
- *olen = ilen;
- return( mbedtls_gcm_crypt_and_tag( ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT, ilen,
- iv, iv_len, ad, ad_len, input, output,
- tag_len, tag ) );
- }
-#endif /* MBEDTLS_GCM_C */
-#if defined(MBEDTLS_CCM_C)
- if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode )
- {
- *olen = ilen;
- return( mbedtls_ccm_encrypt_and_tag( ctx->cipher_ctx, ilen,
- iv, iv_len, ad, ad_len, input, output,
- tag, tag_len ) );
- }
-#endif /* MBEDTLS_CCM_C */
-
- return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
-}
-
-/*
- * Packet-oriented decryption for AEAD modes
- */
-int mbedtls_cipher_auth_decrypt( mbedtls_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(MBEDTLS_GCM_C)
- if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
- {
- int ret;
-
- *olen = ilen;
- ret = mbedtls_gcm_auth_decrypt( ctx->cipher_ctx, ilen,
- iv, iv_len, ad, ad_len,
- tag, tag_len, input, output );
-
- if( ret == MBEDTLS_ERR_GCM_AUTH_FAILED )
- ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
-
- return( ret );
- }
-#endif /* MBEDTLS_GCM_C */
-#if defined(MBEDTLS_CCM_C)
- if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode )
- {
- int ret;
-
- *olen = ilen;
- ret = mbedtls_ccm_auth_decrypt( ctx->cipher_ctx, ilen,
- iv, iv_len, ad, ad_len,
- input, output, tag, tag_len );
-
- if( ret == MBEDTLS_ERR_CCM_AUTH_FAILED )
- ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
-
- return( ret );
- }
-#endif /* MBEDTLS_CCM_C */
-
- return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
-}
-#endif /* MBEDTLS_CIPHER_MODE_AEAD */
-
-#endif /* MBEDTLS_CIPHER_C */
projects / reactos.git / blobdiff