/** | |
* \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: Apache-2.0 | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); you may | |
* not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | |
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
* 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 "mbedtls/platform_util.h" | |
#include <stdlib.h> | |
#include <string.h> | |
#if defined(MBEDTLS_CHACHAPOLY_C) | |
#include "mbedtls/chachapoly.h" | |
#endif | |
#if defined(MBEDTLS_GCM_C) | |
#include "mbedtls/gcm.h" | |
#endif | |
#if defined(MBEDTLS_CCM_C) | |
#include "mbedtls/ccm.h" | |
#endif | |
#if defined(MBEDTLS_CHACHA20_C) | |
#include "mbedtls/chacha20.h" | |
#endif | |
#if defined(MBEDTLS_CMAC_C) | |
#include "mbedtls/cmac.h" | |
#endif | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
#include "psa/crypto.h" | |
#include "mbedtls/psa_util.h" | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#if defined(MBEDTLS_NIST_KW_C) | |
#include "mbedtls/nist_kw.h" | |
#endif | |
#if defined(MBEDTLS_PLATFORM_C) | |
#include "mbedtls/platform.h" | |
#else | |
#define mbedtls_calloc calloc | |
#define mbedtls_free free | |
#endif | |
#define CIPHER_VALIDATE_RET( cond ) \ | |
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ) | |
#define CIPHER_VALIDATE( cond ) \ | |
MBEDTLS_INTERNAL_VALIDATE( cond ) | |
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) | |
/* Compare the contents of two buffers in constant time. | |
* Returns 0 if the contents are bitwise identical, otherwise returns | |
* a non-zero value. | |
* This is currently only used by GCM and ChaCha20+Poly1305. | |
*/ | |
static int mbedtls_constant_time_memcmp( const void *v1, const void *v2, | |
size_t len ) | |
{ | |
const unsigned char *p1 = (const unsigned char*) v1; | |
const unsigned char *p2 = (const unsigned char*) v2; | |
size_t i; | |
unsigned char diff; | |
for( diff = 0, i = 0; i < len; i++ ) | |
diff |= p1[i] ^ p2[i]; | |
return( (int)diff ); | |
} | |
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ | |
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 ) | |
{ | |
CIPHER_VALIDATE( ctx != NULL ); | |
memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) ); | |
} | |
void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx ) | |
{ | |
if( ctx == NULL ) | |
return; | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
if( ctx->cipher_ctx != NULL ) | |
{ | |
mbedtls_cipher_context_psa * const cipher_psa = | |
(mbedtls_cipher_context_psa *) ctx->cipher_ctx; | |
if( cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED ) | |
{ | |
/* xxx_free() doesn't allow to return failures. */ | |
(void) psa_destroy_key( cipher_psa->slot ); | |
} | |
mbedtls_platform_zeroize( cipher_psa, sizeof( *cipher_psa ) ); | |
mbedtls_free( cipher_psa ); | |
} | |
mbedtls_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) ); | |
return; | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#if defined(MBEDTLS_CMAC_C) | |
if( ctx->cmac_ctx ) | |
{ | |
mbedtls_platform_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_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) ); | |
} | |
int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx, | |
const mbedtls_cipher_info_t *cipher_info ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
if( cipher_info == NULL ) | |
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 ); | |
} | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
int mbedtls_cipher_setup_psa( mbedtls_cipher_context_t *ctx, | |
const mbedtls_cipher_info_t *cipher_info, | |
size_t taglen ) | |
{ | |
psa_algorithm_t alg; | |
mbedtls_cipher_context_psa *cipher_psa; | |
if( NULL == cipher_info || NULL == ctx ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
/* Check that the underlying cipher mode and cipher type are | |
* supported by the underlying PSA Crypto implementation. */ | |
alg = mbedtls_psa_translate_cipher_mode( cipher_info->mode, taglen ); | |
if( alg == 0 ) | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
if( mbedtls_psa_translate_cipher_type( cipher_info->type ) == 0 ) | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) ); | |
cipher_psa = mbedtls_calloc( 1, sizeof(mbedtls_cipher_context_psa ) ); | |
if( cipher_psa == NULL ) | |
return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED ); | |
cipher_psa->alg = alg; | |
ctx->cipher_ctx = cipher_psa; | |
ctx->cipher_info = cipher_info; | |
ctx->psa_enabled = 1; | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, | |
const unsigned char *key, | |
int key_bitlen, | |
const mbedtls_operation_t operation ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( key != NULL ); | |
CIPHER_VALIDATE_RET( operation == MBEDTLS_ENCRYPT || | |
operation == MBEDTLS_DECRYPT ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
mbedtls_cipher_context_psa * const cipher_psa = | |
(mbedtls_cipher_context_psa *) ctx->cipher_ctx; | |
size_t const key_bytelen = ( (size_t) key_bitlen + 7 ) / 8; | |
psa_status_t status; | |
psa_key_type_t key_type; | |
psa_key_usage_t key_usage; | |
psa_key_policy_t key_policy; | |
/* PSA Crypto API only accepts byte-aligned keys. */ | |
if( key_bitlen % 8 != 0 ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
/* Don't allow keys to be set multiple times. */ | |
if( cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
key_type = mbedtls_psa_translate_cipher_type( | |
ctx->cipher_info->type ); | |
if( key_type == 0 ) | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
/* Allocate a key slot to use. */ | |
status = psa_allocate_key( &cipher_psa->slot ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
/* Indicate that we own the key slot and need to | |
* destroy it in mbedtls_cipher_free(). */ | |
cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED; | |
/* From that point on, the responsibility for destroying the | |
* key slot is on mbedtls_cipher_free(). This includes the case | |
* where the policy setup or key import below fail, as | |
* mbedtls_cipher_free() needs to be called in any case. */ | |
/* Setup policy for the new key slot. */ | |
key_policy = psa_key_policy_init(); | |
/* Mbed TLS' cipher layer doesn't enforce the mode of operation | |
* (encrypt vs. decrypt): it is possible to setup a key for encryption | |
* and use it for AEAD decryption. Until tests relying on this | |
* are changed, allow any usage in PSA. */ | |
/* key_usage = mbedtls_psa_translate_cipher_operation( operation ); */ | |
key_usage = PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT; | |
psa_key_policy_set_usage( &key_policy, key_usage, cipher_psa->alg ); | |
status = psa_set_key_policy( cipher_psa->slot, &key_policy ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
/* Populate new key slot. */ | |
status = psa_import_key( cipher_psa->slot, | |
key_type, key, key_bytelen ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
ctx->key_bitlen = key_bitlen; | |
ctx->operation = operation; | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
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 OFB, CFB and CTR mode always use the encryption key schedule | |
*/ | |
if( MBEDTLS_ENCRYPT == operation || | |
MBEDTLS_MODE_CFB == ctx->cipher_info->mode || | |
MBEDTLS_MODE_OFB == 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; | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto has an API for multipart | |
* operations, we currently don't make it | |
* accessible through the cipher layer. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
/* 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 ); | |
} | |
#if defined(MBEDTLS_CHACHA20_C) | |
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 ) | |
{ | |
if ( 0 != mbedtls_chacha20_starts( (mbedtls_chacha20_context*)ctx->cipher_ctx, | |
iv, | |
0U ) ) /* Initial counter value */ | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
} | |
#endif | |
if ( actual_iv_size != 0 ) | |
{ | |
memcpy( ctx->iv, iv, actual_iv_size ); | |
ctx->iv_size = actual_iv_size; | |
} | |
return( 0 ); | |
} | |
int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* We don't support resetting PSA-based | |
* cipher contexts, yet. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
ctx->unprocessed_len = 0; | |
return( 0 ); | |
} | |
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) | |
int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx, | |
const unsigned char *ad, size_t ad_len ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto has an API for multipart | |
* operations, we currently don't make it | |
* accessible through the cipher layer. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#if defined(MBEDTLS_GCM_C) | |
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 ) ); | |
} | |
#endif | |
#if defined(MBEDTLS_CHACHAPOLY_C) | |
if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) | |
{ | |
int result; | |
mbedtls_chachapoly_mode_t mode; | |
mode = ( ctx->operation == MBEDTLS_ENCRYPT ) | |
? MBEDTLS_CHACHAPOLY_ENCRYPT | |
: MBEDTLS_CHACHAPOLY_DECRYPT; | |
result = mbedtls_chachapoly_starts( (mbedtls_chachapoly_context*) ctx->cipher_ctx, | |
ctx->iv, | |
mode ); | |
if ( result != 0 ) | |
return( result ); | |
return( mbedtls_chachapoly_update_aad( (mbedtls_chachapoly_context*) ctx->cipher_ctx, | |
ad, ad_len ) ); | |
} | |
#endif | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_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; | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( ilen == 0 || input != NULL ); | |
CIPHER_VALIDATE_RET( output != NULL ); | |
CIPHER_VALIDATE_RET( olen != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto has an API for multipart | |
* operations, we currently don't make it | |
* accessible through the cipher layer. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
*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 defined(MBEDTLS_CHACHAPOLY_C) | |
if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 ) | |
{ | |
*olen = ilen; | |
return( mbedtls_chachapoly_update( (mbedtls_chachapoly_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 && NULL != ctx->add_padding && | |
ilen <= block_size - ctx->unprocessed_len ) || | |
( ctx->operation == MBEDTLS_DECRYPT && NULL == ctx->add_padding && | |
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 ); | |
} | |
/* Encryption: only cache partial blocks | |
* Decryption w/ padding: always keep at least one whole block | |
* Decryption w/o padding: only cache partial blocks | |
*/ | |
copy_len = ilen % block_size; | |
if( copy_len == 0 && | |
ctx->operation == MBEDTLS_DECRYPT && | |
NULL != ctx->add_padding) | |
{ | |
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_OFB) | |
if( ctx->cipher_info->mode == MBEDTLS_MODE_OFB ) | |
{ | |
if( 0 != ( ret = ctx->cipher_info->base->ofb_func( ctx->cipher_ctx, | |
ilen, &ctx->unprocessed_len, ctx->iv, input, output ) ) ) | |
{ | |
return( ret ); | |
} | |
*olen = ilen; | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_CIPHER_MODE_OFB */ | |
#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_XTS) | |
if( ctx->cipher_info->mode == MBEDTLS_MODE_XTS ) | |
{ | |
if( ctx->unprocessed_len > 0 ) { | |
/* We can only process an entire data unit at a time. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
ret = ctx->cipher_info->base->xts_func( ctx->cipher_ctx, | |
ctx->operation, ilen, ctx->iv, input, output ); | |
if( ret != 0 ) | |
{ | |
return( ret ); | |
} | |
*olen = ilen; | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_CIPHER_MODE_XTS */ | |
#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 = 0x80; | |
*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] * ( 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 ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( output != NULL ); | |
CIPHER_VALIDATE_RET( olen != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto has an API for multipart | |
* operations, we currently don't make it | |
* accessible through the cipher layer. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
*olen = 0; | |
if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode || | |
MBEDTLS_MODE_OFB == ctx->cipher_info->mode || | |
MBEDTLS_MODE_CTR == ctx->cipher_info->mode || | |
MBEDTLS_MODE_GCM == ctx->cipher_info->mode || | |
MBEDTLS_MODE_XTS == ctx->cipher_info->mode || | |
MBEDTLS_MODE_STREAM == ctx->cipher_info->mode ) | |
{ | |
return( 0 ); | |
} | |
if ( ( MBEDTLS_CIPHER_CHACHA20 == ctx->cipher_info->type ) || | |
( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) ) | |
{ | |
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 ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
if( NULL == ctx->cipher_info || MBEDTLS_MODE_CBC != ctx->cipher_info->mode ) | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto knows about CBC padding | |
* schemes, we currently don't make them | |
* accessible through the cipher layer. */ | |
if( mode != MBEDTLS_PADDING_NONE ) | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
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) || defined(MBEDTLS_CHACHAPOLY_C) | |
int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx, | |
unsigned char *tag, size_t tag_len ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
if( MBEDTLS_ENCRYPT != ctx->operation ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto has an API for multipart | |
* operations, we currently don't make it | |
* accessible through the cipher layer. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#if defined(MBEDTLS_GCM_C) | |
if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) | |
return( mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx, | |
tag, tag_len ) ); | |
#endif | |
#if defined(MBEDTLS_CHACHAPOLY_C) | |
if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) | |
{ | |
/* Don't allow truncated MAC for Poly1305 */ | |
if ( tag_len != 16U ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
return( mbedtls_chachapoly_finish( | |
(mbedtls_chachapoly_context*) ctx->cipher_ctx, tag ) ); | |
} | |
#endif | |
return( 0 ); | |
} | |
int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx, | |
const unsigned char *tag, size_t tag_len ) | |
{ | |
unsigned char check_tag[16]; | |
int ret; | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL ); | |
if( ctx->cipher_info == NULL ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
if( MBEDTLS_DECRYPT != ctx->operation ) | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* While PSA Crypto has an API for multipart | |
* operations, we currently don't make it | |
* accessible through the cipher layer. */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#if defined(MBEDTLS_GCM_C) | |
if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode ) | |
{ | |
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" */ | |
if( mbedtls_constant_time_memcmp( tag, check_tag, tag_len ) != 0 ) | |
return( MBEDTLS_ERR_CIPHER_AUTH_FAILED ); | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_GCM_C */ | |
#if defined(MBEDTLS_CHACHAPOLY_C) | |
if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) | |
{ | |
/* Don't allow truncated MAC for Poly1305 */ | |
if ( tag_len != sizeof( check_tag ) ) | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
ret = mbedtls_chachapoly_finish( | |
(mbedtls_chachapoly_context*) ctx->cipher_ctx, check_tag ); | |
if ( ret != 0 ) | |
{ | |
return( ret ); | |
} | |
/* Check the tag in "constant-time" */ | |
if( mbedtls_constant_time_memcmp( tag, check_tag, tag_len ) != 0 ) | |
return( MBEDTLS_ERR_CIPHER_AUTH_FAILED ); | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_CHACHAPOLY_C */ | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_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; | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( iv_len == 0 || iv != NULL ); | |
CIPHER_VALIDATE_RET( ilen == 0 || input != NULL ); | |
CIPHER_VALIDATE_RET( output != NULL ); | |
CIPHER_VALIDATE_RET( olen != NULL ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* As in the non-PSA case, we don't check that | |
* a key has been set. If not, the key slot will | |
* still be in its default state of 0, which is | |
* guaranteed to be invalid, hence the PSA-call | |
* below will gracefully fail. */ | |
mbedtls_cipher_context_psa * const cipher_psa = | |
(mbedtls_cipher_context_psa *) ctx->cipher_ctx; | |
psa_status_t status; | |
psa_cipher_operation_t cipher_op = PSA_CIPHER_OPERATION_INIT; | |
size_t part_len; | |
if( ctx->operation == MBEDTLS_DECRYPT ) | |
{ | |
status = psa_cipher_decrypt_setup( &cipher_op, | |
cipher_psa->slot, | |
cipher_psa->alg ); | |
} | |
else if( ctx->operation == MBEDTLS_ENCRYPT ) | |
{ | |
status = psa_cipher_encrypt_setup( &cipher_op, | |
cipher_psa->slot, | |
cipher_psa->alg ); | |
} | |
else | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
/* In the following, we can immediately return on an error, | |
* because the PSA Crypto API guarantees that cipher operations | |
* are terminated by unsuccessful calls to psa_cipher_update(), | |
* and by any call to psa_cipher_finish(). */ | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
status = psa_cipher_set_iv( &cipher_op, iv, iv_len ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
status = psa_cipher_update( &cipher_op, | |
input, ilen, | |
output, ilen, olen ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
status = psa_cipher_finish( &cipher_op, | |
output + *olen, ilen - *olen, | |
&part_len ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
*olen += part_len; | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
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 ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( iv != NULL ); | |
CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL ); | |
CIPHER_VALIDATE_RET( ilen == 0 || input != NULL ); | |
CIPHER_VALIDATE_RET( output != NULL ); | |
CIPHER_VALIDATE_RET( olen != NULL ); | |
CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* As in the non-PSA case, we don't check that | |
* a key has been set. If not, the key slot will | |
* still be in its default state of 0, which is | |
* guaranteed to be invalid, hence the PSA-call | |
* below will gracefully fail. */ | |
mbedtls_cipher_context_psa * const cipher_psa = | |
(mbedtls_cipher_context_psa *) ctx->cipher_ctx; | |
psa_status_t status; | |
/* PSA Crypto API always writes the authentication tag | |
* at the end of the encrypted message. */ | |
if( tag != output + ilen ) | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
status = psa_aead_encrypt( cipher_psa->slot, | |
cipher_psa->alg, | |
iv, iv_len, | |
ad, ad_len, | |
input, ilen, | |
output, ilen + tag_len, olen ); | |
if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
*olen -= tag_len; | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#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 */ | |
#if defined(MBEDTLS_CHACHAPOLY_C) | |
if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) | |
{ | |
/* ChachaPoly has fixed length nonce and MAC (tag) */ | |
if ( ( iv_len != ctx->cipher_info->iv_size ) || | |
( tag_len != 16U ) ) | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
*olen = ilen; | |
return( mbedtls_chachapoly_encrypt_and_tag( ctx->cipher_ctx, | |
ilen, iv, ad, ad_len, input, output, tag ) ); | |
} | |
#endif /* MBEDTLS_CHACHAPOLY_C */ | |
#if defined(MBEDTLS_NIST_KW_C) | |
if( MBEDTLS_MODE_KW == ctx->cipher_info->mode || | |
MBEDTLS_MODE_KWP == ctx->cipher_info->mode ) | |
{ | |
mbedtls_nist_kw_mode_t mode = ( MBEDTLS_MODE_KW == ctx->cipher_info->mode ) ? | |
MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP; | |
/* There is no iv, tag or ad associated with KW and KWP, these length should be 0 */ | |
if( iv_len != 0 || tag_len != 0 || ad_len != 0 ) | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
return( mbedtls_nist_kw_wrap( ctx->cipher_ctx, mode, input, ilen, output, olen, SIZE_MAX ) ); | |
} | |
#endif /* MBEDTLS_NIST_KW_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 ) | |
{ | |
CIPHER_VALIDATE_RET( ctx != NULL ); | |
CIPHER_VALIDATE_RET( iv != NULL ); | |
CIPHER_VALIDATE_RET( ad_len == 0 || ad != NULL ); | |
CIPHER_VALIDATE_RET( ilen == 0 || input != NULL ); | |
CIPHER_VALIDATE_RET( output != NULL ); | |
CIPHER_VALIDATE_RET( olen != NULL ); | |
CIPHER_VALIDATE_RET( tag_len == 0 || tag != NULL ); | |
#if defined(MBEDTLS_USE_PSA_CRYPTO) | |
if( ctx->psa_enabled == 1 ) | |
{ | |
/* As in the non-PSA case, we don't check that | |
* a key has been set. If not, the key slot will | |
* still be in its default state of 0, which is | |
* guaranteed to be invalid, hence the PSA-call | |
* below will gracefully fail. */ | |
mbedtls_cipher_context_psa * const cipher_psa = | |
(mbedtls_cipher_context_psa *) ctx->cipher_ctx; | |
psa_status_t status; | |
/* PSA Crypto API always writes the authentication tag | |
* at the end of the encrypted message. */ | |
if( tag != input + ilen ) | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
status = psa_aead_decrypt( cipher_psa->slot, | |
cipher_psa->alg, | |
iv, iv_len, | |
ad, ad_len, | |
input, ilen + tag_len, | |
output, ilen, olen ); | |
if( status == PSA_ERROR_INVALID_SIGNATURE ) | |
return( MBEDTLS_ERR_CIPHER_AUTH_FAILED ); | |
else if( status != PSA_SUCCESS ) | |
return( MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED ); | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_USE_PSA_CRYPTO */ | |
#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 */ | |
#if defined(MBEDTLS_CHACHAPOLY_C) | |
if ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) | |
{ | |
int ret; | |
/* ChachaPoly has fixed length nonce and MAC (tag) */ | |
if ( ( iv_len != ctx->cipher_info->iv_size ) || | |
( tag_len != 16U ) ) | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
*olen = ilen; | |
ret = mbedtls_chachapoly_auth_decrypt( ctx->cipher_ctx, ilen, | |
iv, ad, ad_len, tag, input, output ); | |
if( ret == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED ) | |
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; | |
return( ret ); | |
} | |
#endif /* MBEDTLS_CHACHAPOLY_C */ | |
#if defined(MBEDTLS_NIST_KW_C) | |
if( MBEDTLS_MODE_KW == ctx->cipher_info->mode || | |
MBEDTLS_MODE_KWP == ctx->cipher_info->mode ) | |
{ | |
mbedtls_nist_kw_mode_t mode = ( MBEDTLS_MODE_KW == ctx->cipher_info->mode ) ? | |
MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP; | |
/* There is no iv, tag or ad associated with KW and KWP, these length should be 0 */ | |
if( iv_len != 0 || tag_len != 0 || ad_len != 0 ) | |
{ | |
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); | |
} | |
return( mbedtls_nist_kw_unwrap( ctx->cipher_ctx, mode, input, ilen, output, olen, SIZE_MAX ) ); | |
} | |
#endif /* MBEDTLS_NIST_KW_C */ | |
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); | |
} | |
#endif /* MBEDTLS_CIPHER_MODE_AEAD */ | |
#endif /* MBEDTLS_CIPHER_C */ |