1583 lines
50 KiB
C
1583 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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#include "mbedtls/platform.h"
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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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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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}
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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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}
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}
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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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}
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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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}
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}
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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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}
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}
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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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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (ctx->psa_enabled == 1) {
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if (ctx->cipher_ctx != NULL) {
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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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/* 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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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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}
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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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}
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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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}
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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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}
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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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}
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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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}
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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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}
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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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}
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if (ctx->cipher_info == NULL) {
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return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (ctx->psa_enabled == 1) {
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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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}
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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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}
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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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}
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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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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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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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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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}
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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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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (ctx->psa_enabled == 1) {
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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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}
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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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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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}
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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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/* 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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}
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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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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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}
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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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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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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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}
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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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}
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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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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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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (ctx->psa_enabled == 1) {
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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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}
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
|
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if (ctx->psa_enabled == 1) {
|
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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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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 MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
}
|
|
#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 MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
}
|
|
|
|
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. */
|
|
ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
|
|
#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)
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/*
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* Packet-oriented encryption for AEAD/NIST_KW: public function.
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*/
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int mbedtls_cipher_auth_encrypt_ext(mbedtls_cipher_context_t *ctx,
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const unsigned char *iv, size_t iv_len,
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const unsigned char *ad, size_t ad_len,
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const unsigned char *input, size_t ilen,
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unsigned char *output, size_t output_len,
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size_t *olen, size_t tag_len)
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{
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#if defined(MBEDTLS_NIST_KW_C)
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if (
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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ctx->psa_enabled == 0 &&
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#endif
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(MBEDTLS_MODE_KW == ctx->cipher_info->mode ||
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MBEDTLS_MODE_KWP == ctx->cipher_info->mode)) {
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mbedtls_nist_kw_mode_t mode = (MBEDTLS_MODE_KW == ctx->cipher_info->mode) ?
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MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP;
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/* There is no iv, tag or ad associated with KW and KWP,
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* so these length should be 0 as documented. */
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if (iv_len != 0 || tag_len != 0 || ad_len != 0) {
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return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
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}
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(void) iv;
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(void) ad;
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return mbedtls_nist_kw_wrap(ctx->cipher_ctx, mode, input, ilen,
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output, olen, output_len);
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}
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#endif /* MBEDTLS_NIST_KW_C */
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#if defined(MBEDTLS_CIPHER_MODE_AEAD)
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/* AEAD case: check length before passing on to shared function */
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if (output_len < ilen + tag_len) {
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return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
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}
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int ret = mbedtls_cipher_aead_encrypt(ctx, iv, iv_len, ad, ad_len,
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input, ilen, output, olen,
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output + ilen, tag_len);
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*olen += tag_len;
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return ret;
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#else
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return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
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#endif /* MBEDTLS_CIPHER_MODE_AEAD */
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}
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|
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/*
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* Packet-oriented decryption for AEAD/NIST_KW: public function.
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|
*/
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int mbedtls_cipher_auth_decrypt_ext(mbedtls_cipher_context_t *ctx,
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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)
|
|
{
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|
#if defined(MBEDTLS_NIST_KW_C)
|
|
if (
|
|
#if defined(MBEDTLS_USE_PSA_CRYPTO)
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ctx->psa_enabled == 0 &&
|
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#endif
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(MBEDTLS_MODE_KW == ctx->cipher_info->mode ||
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MBEDTLS_MODE_KWP == ctx->cipher_info->mode)) {
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mbedtls_nist_kw_mode_t mode = (MBEDTLS_MODE_KW == ctx->cipher_info->mode) ?
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MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP;
|
|
|
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/* 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) {
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return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
|
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}
|
|
|
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(void) iv;
|
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(void) ad;
|
|
|
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return mbedtls_nist_kw_unwrap(ctx->cipher_ctx, mode, input, ilen,
|
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output, olen, output_len);
|
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}
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#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;
|
|
}
|
|
|
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return mbedtls_cipher_aead_decrypt(ctx, iv, iv_len, ad, ad_len,
|
|
input, ilen - tag_len, output, olen,
|
|
input + ilen - tag_len, tag_len);
|
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#else
|
|
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
|
|
#endif /* MBEDTLS_CIPHER_MODE_AEAD */
|
|
}
|
|
#endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */
|
|
|
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#endif /* MBEDTLS_CIPHER_C */
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