1599 lines
50 KiB
C
1599 lines
50 KiB
C
/**
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* \file cipher.c
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*
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* \brief Generic cipher wrapper for mbed TLS
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*
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* \author Adriaan de Jong <dejong@fox-it.com>
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_CIPHER_C)
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#include "mbedtls/cipher.h"
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#include "cipher_wrap.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include "mbedtls/constant_time.h"
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#include <stdlib.h>
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#include <string.h>
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#if defined(MBEDTLS_CHACHAPOLY_C)
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#include "mbedtls/chachapoly.h"
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#endif
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#if defined(MBEDTLS_GCM_C)
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#include "mbedtls/gcm.h"
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#endif
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#if defined(MBEDTLS_CCM_C)
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#include "mbedtls/ccm.h"
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#endif
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#if defined(MBEDTLS_CHACHA20_C)
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#include "mbedtls/chacha20.h"
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#endif
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#if defined(MBEDTLS_CMAC_C)
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#include "mbedtls/cmac.h"
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "psa/crypto.h"
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#include "mbedtls/psa_util.h"
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_NIST_KW_C)
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#include "mbedtls/nist_kw.h"
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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static int supported_init = 0;
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const int *mbedtls_cipher_list( void )
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{
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const mbedtls_cipher_definition_t *def;
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int *type;
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if( ! supported_init )
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{
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def = mbedtls_cipher_definitions;
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type = mbedtls_cipher_supported;
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while( def->type != 0 )
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*type++ = (*def++).type;
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*type = 0;
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supported_init = 1;
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}
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return( mbedtls_cipher_supported );
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}
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const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type(
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const mbedtls_cipher_type_t cipher_type )
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{
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const mbedtls_cipher_definition_t *def;
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for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
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if( def->type == cipher_type )
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return( def->info );
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return( NULL );
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}
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const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string(
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const char *cipher_name )
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{
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const mbedtls_cipher_definition_t *def;
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if( NULL == cipher_name )
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return( NULL );
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for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
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if( ! strcmp( def->info->name, cipher_name ) )
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return( def->info );
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return( NULL );
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}
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const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values(
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const mbedtls_cipher_id_t cipher_id,
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int key_bitlen,
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const mbedtls_cipher_mode_t mode )
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{
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const mbedtls_cipher_definition_t *def;
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for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
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if( def->info->base->cipher == cipher_id &&
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def->info->key_bitlen == (unsigned) key_bitlen &&
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def->info->mode == mode )
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return( def->info );
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return( NULL );
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}
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void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx )
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{
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memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
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}
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void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx )
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{
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if( ctx == NULL )
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return;
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if( ctx->psa_enabled == 1 )
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{
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if( ctx->cipher_ctx != NULL )
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{
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mbedtls_cipher_context_psa * const cipher_psa =
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(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
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if( cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED )
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{
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/* xxx_free() doesn't allow to return failures. */
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(void) psa_destroy_key( cipher_psa->slot );
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}
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mbedtls_platform_zeroize( cipher_psa, sizeof( *cipher_psa ) );
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mbedtls_free( cipher_psa );
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}
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mbedtls_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) );
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return;
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_CMAC_C)
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if( ctx->cmac_ctx )
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{
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mbedtls_platform_zeroize( ctx->cmac_ctx,
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sizeof( mbedtls_cmac_context_t ) );
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mbedtls_free( ctx->cmac_ctx );
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}
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#endif
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if( ctx->cipher_ctx )
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ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx );
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mbedtls_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) );
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}
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int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx,
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const mbedtls_cipher_info_t *cipher_info )
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{
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if( cipher_info == NULL )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
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if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
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return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
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ctx->cipher_info = cipher_info;
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#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
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/*
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* Ignore possible errors caused by a cipher mode that doesn't use padding
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*/
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#if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
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(void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_PKCS7 );
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#else
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(void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_NONE );
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#endif
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#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
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return( 0 );
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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#if !defined(MBEDTLS_DEPRECATED_REMOVED)
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int mbedtls_cipher_setup_psa( mbedtls_cipher_context_t *ctx,
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const mbedtls_cipher_info_t *cipher_info,
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size_t taglen )
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{
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psa_algorithm_t alg;
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mbedtls_cipher_context_psa *cipher_psa;
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if( NULL == cipher_info || NULL == ctx )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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/* Check that the underlying cipher mode and cipher type are
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* supported by the underlying PSA Crypto implementation. */
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alg = mbedtls_psa_translate_cipher_mode( cipher_info->mode, taglen );
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if( alg == 0 )
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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if( mbedtls_psa_translate_cipher_type( cipher_info->type ) == 0 )
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
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cipher_psa = mbedtls_calloc( 1, sizeof(mbedtls_cipher_context_psa ) );
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if( cipher_psa == NULL )
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return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
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cipher_psa->alg = alg;
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ctx->cipher_ctx = cipher_psa;
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ctx->cipher_info = cipher_info;
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ctx->psa_enabled = 1;
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return( 0 );
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}
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#endif /* MBEDTLS_DEPRECATED_REMOVED */
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
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const unsigned char *key,
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int key_bitlen,
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const mbedtls_operation_t operation )
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{
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if( operation != MBEDTLS_ENCRYPT && operation != MBEDTLS_DECRYPT )
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return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
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if( ctx->cipher_info == NULL )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if( ctx->psa_enabled == 1 )
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{
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mbedtls_cipher_context_psa * const cipher_psa =
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(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
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size_t const key_bytelen = ( (size_t) key_bitlen + 7 ) / 8;
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psa_status_t status;
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psa_key_type_t key_type;
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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/* PSA Crypto API only accepts byte-aligned keys. */
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if( key_bitlen % 8 != 0 )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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/* Don't allow keys to be set multiple times. */
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if( cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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key_type = mbedtls_psa_translate_cipher_type(
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ctx->cipher_info->type );
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if( key_type == 0 )
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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psa_set_key_type( &attributes, key_type );
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/* Mbed TLS' cipher layer doesn't enforce the mode of operation
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* (encrypt vs. decrypt): it is possible to setup a key for encryption
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* and use it for AEAD decryption. Until tests relying on this
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* are changed, allow any usage in PSA. */
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psa_set_key_usage_flags( &attributes,
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/* mbedtls_psa_translate_cipher_operation( operation ); */
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PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
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psa_set_key_algorithm( &attributes, cipher_psa->alg );
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status = psa_import_key( &attributes, key, key_bytelen,
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&cipher_psa->slot );
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switch( status )
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{
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case PSA_SUCCESS:
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break;
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case PSA_ERROR_INSUFFICIENT_MEMORY:
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return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
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case PSA_ERROR_NOT_SUPPORTED:
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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default:
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return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
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}
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/* Indicate that we own the key slot and need to
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* destroy it in mbedtls_cipher_free(). */
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cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
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ctx->key_bitlen = key_bitlen;
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ctx->operation = operation;
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return( 0 );
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN ) == 0 &&
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(int) ctx->cipher_info->key_bitlen != key_bitlen )
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{
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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}
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ctx->key_bitlen = key_bitlen;
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ctx->operation = operation;
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/*
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* For OFB, CFB and CTR mode always use the encryption key schedule
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*/
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if( MBEDTLS_ENCRYPT == operation ||
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MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
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MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
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MBEDTLS_MODE_CTR == ctx->cipher_info->mode )
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{
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return( ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key,
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ctx->key_bitlen ) );
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}
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if( MBEDTLS_DECRYPT == operation )
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return( ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key,
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ctx->key_bitlen ) );
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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}
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int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
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const unsigned char *iv,
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size_t iv_len )
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{
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size_t actual_iv_size;
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if( ctx->cipher_info == NULL )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if( ctx->psa_enabled == 1 )
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{
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/* While PSA Crypto has an API for multipart
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* operations, we currently don't make it
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* accessible through the cipher layer. */
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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/* avoid buffer overflow in ctx->iv */
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if( iv_len > MBEDTLS_MAX_IV_LENGTH )
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN ) != 0 )
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actual_iv_size = iv_len;
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else
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{
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actual_iv_size = ctx->cipher_info->iv_size;
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/* avoid reading past the end of input buffer */
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if( actual_iv_size > iv_len )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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}
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#if defined(MBEDTLS_CHACHA20_C)
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if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20 )
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{
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/* Even though the actual_iv_size is overwritten with a correct value
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* of 12 from the cipher info, return an error to indicate that
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* the input iv_len is wrong. */
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if( iv_len != 12 )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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if ( 0 != mbedtls_chacha20_starts( (mbedtls_chacha20_context*)ctx->cipher_ctx,
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iv,
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0U ) ) /* Initial counter value */
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{
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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}
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}
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#if defined(MBEDTLS_CHACHAPOLY_C)
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if ( ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 &&
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iv_len != 12 )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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#endif
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#endif
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#if defined(MBEDTLS_GCM_C)
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if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
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{
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return( mbedtls_gcm_starts( (mbedtls_gcm_context *) ctx->cipher_ctx,
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ctx->operation,
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iv, iv_len ) );
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}
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#endif
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#if defined(MBEDTLS_CCM_C)
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if( MBEDTLS_MODE_CCM_STAR_NO_TAG == ctx->cipher_info->mode )
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{
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int set_lengths_result;
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int ccm_star_mode;
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set_lengths_result = mbedtls_ccm_set_lengths(
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(mbedtls_ccm_context *) ctx->cipher_ctx,
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0, 0, 0 );
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if( set_lengths_result != 0 )
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return set_lengths_result;
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if( ctx->operation == MBEDTLS_DECRYPT )
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ccm_star_mode = MBEDTLS_CCM_STAR_DECRYPT;
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else if( ctx->operation == MBEDTLS_ENCRYPT )
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ccm_star_mode = MBEDTLS_CCM_STAR_ENCRYPT;
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else
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return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
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return( mbedtls_ccm_starts( (mbedtls_ccm_context *) ctx->cipher_ctx,
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ccm_star_mode,
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iv, iv_len ) );
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}
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#endif
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if ( actual_iv_size != 0 )
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{
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memcpy( ctx->iv, iv, actual_iv_size );
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ctx->iv_size = actual_iv_size;
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}
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return( 0 );
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}
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int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx )
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{
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if( ctx->cipher_info == NULL )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if( ctx->psa_enabled == 1 )
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{
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/* We don't support resetting PSA-based
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* cipher contexts, yet. */
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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ctx->unprocessed_len = 0;
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return( 0 );
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}
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#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
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int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
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const unsigned char *ad, size_t ad_len )
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{
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if( ctx->cipher_info == NULL )
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return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if( ctx->psa_enabled == 1 )
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{
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/* While PSA Crypto has an API for multipart
|
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* operations, we currently don't make it
|
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* accessible through the cipher layer. */
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return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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#if defined(MBEDTLS_GCM_C)
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if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
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{
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return( mbedtls_gcm_update_ad( (mbedtls_gcm_context *) ctx->cipher_ctx,
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ad, ad_len ) );
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}
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#endif
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#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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t block_size;
|
|
|
|
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 ( 0 == block_size )
|
|
{
|
|
return( MBEDTLS_ERR_CIPHER_INVALID_CONTEXT );
|
|
}
|
|
|
|
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 )
|
|
{
|
|
return( mbedtls_gcm_update( (mbedtls_gcm_context *) ctx->cipher_ctx,
|
|
input, ilen,
|
|
output, ilen, olen ) );
|
|
}
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_CCM_C)
|
|
if( ctx->cipher_info->mode == MBEDTLS_MODE_CCM_STAR_NO_TAG )
|
|
{
|
|
return( mbedtls_ccm_update( (mbedtls_ccm_context *) ctx->cipher_ctx,
|
|
input, ilen,
|
|
output, ilen, olen ) );
|
|
}
|
|
#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( 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 )
|
|
{
|
|
/* 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 )
|
|
{
|
|
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_CCM_STAR_NO_TAG == 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 )
|
|
{
|
|
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 )
|
|
{
|
|
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 );
|
|
}
|
|
#endif /* MBEDTLS_USE_PSA_CRYPTO */
|
|
|
|
#if defined(MBEDTLS_GCM_C)
|
|
if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
|
|
{
|
|
size_t output_length;
|
|
/* The code here doesn't yet support alternative implementations
|
|
* that can delay up to a block of output. */
|
|
return( mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx,
|
|
NULL, 0, &output_length,
|
|
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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
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 */
|
|
|
|
/* Status to return on a non-authenticated algorithm. It would make sense
|
|
* to return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT or perhaps
|
|
* MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA, but at the time I write this our
|
|
* unit tests assume 0. */
|
|
ret = 0;
|
|
|
|
#if defined(MBEDTLS_GCM_C)
|
|
if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
|
|
{
|
|
size_t output_length;
|
|
/* The code here doesn't yet support alternative implementations
|
|
* that can delay up to a block of output. */
|
|
|
|
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,
|
|
NULL, 0, &output_length,
|
|
check_tag, tag_len ) ) )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
/* Check the tag in "constant-time" */
|
|
if( mbedtls_ct_memcmp( tag, check_tag, tag_len ) != 0 )
|
|
{
|
|
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
|
|
goto exit;
|
|
}
|
|
}
|
|
#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_ct_memcmp( tag, check_tag, tag_len ) != 0 )
|
|
{
|
|
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
|
|
goto exit;
|
|
}
|
|
}
|
|
#endif /* MBEDTLS_CHACHAPOLY_C */
|
|
|
|
exit:
|
|
mbedtls_platform_zeroize( check_tag, tag_len );
|
|
return( ret );
|
|
}
|
|
#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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t finish_olen;
|
|
|
|
#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_PLATFORM_HW_ACCEL_FAILED );
|
|
|
|
if( ctx->cipher_info->mode != MBEDTLS_MODE_ECB )
|
|
{
|
|
status = psa_cipher_set_iv( &cipher_op, iv, iv_len );
|
|
if( status != PSA_SUCCESS )
|
|
return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
|
|
}
|
|
|
|
status = psa_cipher_update( &cipher_op,
|
|
input, ilen,
|
|
output, ilen, olen );
|
|
if( status != PSA_SUCCESS )
|
|
return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
|
|
|
|
status = psa_cipher_finish( &cipher_op,
|
|
output + *olen, ilen - *olen,
|
|
&part_len );
|
|
if( status != PSA_SUCCESS )
|
|
return( MBEDTLS_ERR_PLATFORM_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: internal function used by
|
|
* mbedtls_cipher_auth_encrypt_ext().
|
|
*/
|
|
static int mbedtls_cipher_aead_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_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( output == NULL || 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_PLATFORM_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 */
|
|
|
|
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
|
|
}
|
|
|
|
/*
|
|
* Packet-oriented encryption for AEAD modes: internal function used by
|
|
* mbedtls_cipher_auth_encrypt_ext().
|
|
*/
|
|
static int mbedtls_cipher_aead_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_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( input == NULL || 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_PLATFORM_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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
*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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
|
|
/* 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 */
|
|
|
|
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_MODE_AEAD */
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C)
|
|
/*
|
|
* Packet-oriented encryption for AEAD/NIST_KW: public function.
|
|
*/
|
|
int mbedtls_cipher_auth_encrypt_ext( 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 output_len,
|
|
size_t *olen, size_t tag_len )
|
|
{
|
|
#if defined(MBEDTLS_NIST_KW_C)
|
|
if(
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
ctx->psa_enabled == 0 &&
|
|
#endif
|
|
( 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,
|
|
* so these length should be 0 as documented. */
|
|
if( iv_len != 0 || tag_len != 0 || ad_len != 0 )
|
|
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
|
|
|
|
(void) iv;
|
|
(void) ad;
|
|
|
|
return( mbedtls_nist_kw_wrap( ctx->cipher_ctx, mode, input, ilen,
|
|
output, olen, output_len ) );
|
|
}
|
|
#endif /* MBEDTLS_NIST_KW_C */
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_AEAD)
|
|
/* AEAD case: check length before passing on to shared function */
|
|
if( output_len < ilen + tag_len )
|
|
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
|
|
|
|
int ret = mbedtls_cipher_aead_encrypt( ctx, iv, iv_len, ad, ad_len,
|
|
input, ilen, output, olen,
|
|
output + ilen, tag_len );
|
|
*olen += tag_len;
|
|
return( ret );
|
|
#else
|
|
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
|
|
#endif /* MBEDTLS_CIPHER_MODE_AEAD */
|
|
}
|
|
|
|
/*
|
|
* Packet-oriented decryption for AEAD/NIST_KW: public function.
|
|
*/
|
|
int mbedtls_cipher_auth_decrypt_ext( 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 output_len,
|
|
size_t *olen, size_t tag_len )
|
|
{
|
|
#if defined(MBEDTLS_NIST_KW_C)
|
|
if(
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
|
ctx->psa_enabled == 0 &&
|
|
#endif
|
|
( 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,
|
|
* so these length should be 0 as documented. */
|
|
if( iv_len != 0 || tag_len != 0 || ad_len != 0 )
|
|
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
|
|
|
|
(void) iv;
|
|
(void) ad;
|
|
|
|
return( mbedtls_nist_kw_unwrap( ctx->cipher_ctx, mode, input, ilen,
|
|
output, olen, output_len ) );
|
|
}
|
|
#endif /* MBEDTLS_NIST_KW_C */
|
|
|
|
#if defined(MBEDTLS_CIPHER_MODE_AEAD)
|
|
/* AEAD case: check length before passing on to shared function */
|
|
if( ilen < tag_len || output_len < ilen - tag_len )
|
|
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
|
|
|
|
return( mbedtls_cipher_aead_decrypt( ctx, iv, iv_len, ad, ad_len,
|
|
input, ilen - tag_len, output, olen,
|
|
input + ilen - tag_len, tag_len ) );
|
|
#else
|
|
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
|
|
#endif /* MBEDTLS_CIPHER_MODE_AEAD */
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */
|
|
|
|
#endif /* MBEDTLS_CIPHER_C */
|