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mbedtls/library/cipher.c
Gilles Peskine 1b6c09a62e Switch to the new code style 
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2023-01-11 14:52:35 +01:00

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/**
* \file cipher.c
*
* \brief Generic cipher wrapper for mbed TLS
*
* \author Adriaan de Jong <dejong@fox-it.com>
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common.h"
#if defined(MBEDTLS_CIPHER_C)
#include "mbedtls/cipher.h"
#include "mbedtls/cipher_internal.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "mbedtls/constant_time.h"
#include <stdlib.h>
#include <string.h>
#if defined(MBEDTLS_CHACHAPOLY_C)
#include "mbedtls/chachapoly.h"
#endif
#if defined(MBEDTLS_GCM_C)
#include "mbedtls/gcm.h"
#endif
#if defined(MBEDTLS_CCM_C)
#include "mbedtls/ccm.h"
#endif
#if defined(MBEDTLS_CHACHA20_C)
#include "mbedtls/chacha20.h"
#endif
#if defined(MBEDTLS_CMAC_C)
#include "mbedtls/cmac.h"
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#include "psa/crypto.h"
#include "mbedtls/psa_util.h"
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_NIST_KW_C)
#include "mbedtls/nist_kw.h"
#endif
#include "mbedtls/platform.h"
#define CIPHER_VALIDATE_RET(cond) \
MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA)
#define CIPHER_VALIDATE(cond) \
MBEDTLS_INTERNAL_VALIDATE(cond)
static int supported_init = 0;
const int *mbedtls_cipher_list(void)
{
const mbedtls_cipher_definition_t *def;
int *type;
if (!supported_init) {
def = mbedtls_cipher_definitions;
type = mbedtls_cipher_supported;
while (def->type != 0) {
*type++ = (*def++).type;
}
*type = 0;
supported_init = 1;
}
return mbedtls_cipher_supported;
}
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type(
const mbedtls_cipher_type_t cipher_type)
{
const mbedtls_cipher_definition_t *def;
for (def = mbedtls_cipher_definitions; def->info != NULL; def++) {
if (def->type == cipher_type) {
return def->info;
}
}
return NULL;
}
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string(
const char *cipher_name)
{
const mbedtls_cipher_definition_t *def;
if (NULL == cipher_name) {
return NULL;
}
for (def = mbedtls_cipher_definitions; def->info != NULL; def++) {
if (!strcmp(def->info->name, cipher_name)) {
return def->info;
}
}
return NULL;
}
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values(
const mbedtls_cipher_id_t cipher_id,
int key_bitlen,
const mbedtls_cipher_mode_t mode)
{
const mbedtls_cipher_definition_t *def;
for (def = mbedtls_cipher_definitions; def->info != NULL; def++) {
if (def->info->base->cipher == cipher_id &&
def->info->key_bitlen == (unsigned) key_bitlen &&
def->info->mode == mode) {
return def->info;
}
}
return NULL;
}
void mbedtls_cipher_init(mbedtls_cipher_context_t *ctx)
{
CIPHER_VALIDATE(ctx != NULL);
memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
}
void mbedtls_cipher_free(mbedtls_cipher_context_t *ctx)
{
if (ctx == NULL) {
return;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
if (ctx->cipher_ctx != NULL) {
mbedtls_cipher_context_psa * const cipher_psa =
(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
if (cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED) {
/* xxx_free() doesn't allow to return failures. */
(void) psa_destroy_key(cipher_psa->slot);
}
mbedtls_platform_zeroize(cipher_psa, sizeof(*cipher_psa));
mbedtls_free(cipher_psa);
}
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t));
return;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_CMAC_C)
if (ctx->cmac_ctx) {
mbedtls_platform_zeroize(ctx->cmac_ctx,
sizeof(mbedtls_cmac_context_t));
mbedtls_free(ctx->cmac_ctx);
}
#endif
if (ctx->cipher_ctx) {
ctx->cipher_info->base->ctx_free_func(ctx->cipher_ctx);
}
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t));
}
int mbedtls_cipher_setup(mbedtls_cipher_context_t *ctx,
const mbedtls_cipher_info_t *cipher_info)
{
CIPHER_VALIDATE_RET(ctx != NULL);
if (cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
if (NULL == (ctx->cipher_ctx = cipher_info->base->ctx_alloc_func())) {
return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
}
ctx->cipher_info = cipher_info;
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
/*
* Ignore possible errors caused by a cipher mode that doesn't use padding
*/
#if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
(void) mbedtls_cipher_set_padding_mode(ctx, MBEDTLS_PADDING_PKCS7);
#else
(void) mbedtls_cipher_set_padding_mode(ctx, MBEDTLS_PADDING_NONE);
#endif
#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
return 0;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int mbedtls_cipher_setup_psa(mbedtls_cipher_context_t *ctx,
const mbedtls_cipher_info_t *cipher_info,
size_t taglen)
{
psa_algorithm_t alg;
mbedtls_cipher_context_psa *cipher_psa;
if (NULL == cipher_info || NULL == ctx) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
/* Check that the underlying cipher mode and cipher type are
* supported by the underlying PSA Crypto implementation. */
alg = mbedtls_psa_translate_cipher_mode(cipher_info->mode, taglen);
if (alg == 0) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
if (mbedtls_psa_translate_cipher_type(cipher_info->type) == 0) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
cipher_psa = mbedtls_calloc(1, sizeof(mbedtls_cipher_context_psa));
if (cipher_psa == NULL) {
return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
}
cipher_psa->alg = alg;
ctx->cipher_ctx = cipher_psa;
ctx->cipher_info = cipher_info;
ctx->psa_enabled = 1;
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
int mbedtls_cipher_setkey(mbedtls_cipher_context_t *ctx,
const unsigned char *key,
int key_bitlen,
const mbedtls_operation_t operation)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(key != NULL);
CIPHER_VALIDATE_RET(operation == MBEDTLS_ENCRYPT ||
operation == MBEDTLS_DECRYPT);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
mbedtls_cipher_context_psa * const cipher_psa =
(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
size_t const key_bytelen = ((size_t) key_bitlen + 7) / 8;
psa_status_t status;
psa_key_type_t key_type;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
/* PSA Crypto API only accepts byte-aligned keys. */
if (key_bitlen % 8 != 0) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
/* Don't allow keys to be set multiple times. */
if (cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
key_type = mbedtls_psa_translate_cipher_type(
ctx->cipher_info->type);
if (key_type == 0) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
psa_set_key_type(&attributes, key_type);
/* Mbed TLS' cipher layer doesn't enforce the mode of operation
* (encrypt vs. decrypt): it is possible to setup a key for encryption
* and use it for AEAD decryption. Until tests relying on this
* are changed, allow any usage in PSA. */
psa_set_key_usage_flags(&attributes,
/* mbedtls_psa_translate_cipher_operation( operation ); */
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT);
psa_set_key_algorithm(&attributes, cipher_psa->alg);
status = psa_import_key(&attributes, key, key_bytelen,
&cipher_psa->slot);
switch (status) {
case PSA_SUCCESS:
break;
case PSA_ERROR_INSUFFICIENT_MEMORY:
return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
case PSA_ERROR_NOT_SUPPORTED:
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
default:
return MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED;
}
/* Indicate that we own the key slot and need to
* destroy it in mbedtls_cipher_free(). */
cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED;
ctx->key_bitlen = key_bitlen;
ctx->operation = operation;
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN) == 0 &&
(int) ctx->cipher_info->key_bitlen != key_bitlen) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
ctx->key_bitlen = key_bitlen;
ctx->operation = operation;
/*
* For OFB, CFB and CTR mode always use the encryption key schedule
*/
if (MBEDTLS_ENCRYPT == operation ||
MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_CTR == ctx->cipher_info->mode) {
return ctx->cipher_info->base->setkey_enc_func(ctx->cipher_ctx, key,
ctx->key_bitlen);
}
if (MBEDTLS_DECRYPT == operation) {
return ctx->cipher_info->base->setkey_dec_func(ctx->cipher_ctx, key,
ctx->key_bitlen);
}
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
int mbedtls_cipher_set_iv(mbedtls_cipher_context_t *ctx,
const unsigned char *iv,
size_t iv_len)
{
size_t actual_iv_size;
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(iv_len == 0 || iv != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto has an API for multipart
* operations, we currently don't make it
* accessible through the cipher layer. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/* avoid buffer overflow in ctx->iv */
if (iv_len > MBEDTLS_MAX_IV_LENGTH) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN) != 0) {
actual_iv_size = iv_len;
} else {
actual_iv_size = ctx->cipher_info->iv_size;
/* avoid reading past the end of input buffer */
if (actual_iv_size > iv_len) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
}
#if defined(MBEDTLS_CHACHA20_C)
if (ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20) {
/* Even though the actual_iv_size is overwritten with a correct value
* of 12 from the cipher info, return an error to indicate that
* the input iv_len is wrong. */
if (iv_len != 12) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
if (0 != mbedtls_chacha20_starts((mbedtls_chacha20_context *) ctx->cipher_ctx,
iv,
0U)) { /* Initial counter value */
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
}
#if defined(MBEDTLS_CHACHAPOLY_C)
if (ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305 &&
iv_len != 12) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#endif
#endif
if (actual_iv_size != 0) {
memcpy(ctx->iv, iv, actual_iv_size);
ctx->iv_size = actual_iv_size;
}
return 0;
}
int mbedtls_cipher_reset(mbedtls_cipher_context_t *ctx)
{
CIPHER_VALIDATE_RET(ctx != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* We don't support resetting PSA-based
* cipher contexts, yet. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
ctx->unprocessed_len = 0;
return 0;
}
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
int mbedtls_cipher_update_ad(mbedtls_cipher_context_t *ctx,
const unsigned char *ad, size_t ad_len)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(ad_len == 0 || ad != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto has an API for multipart
* operations, we currently don't make it
* accessible through the cipher layer. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_GCM_C)
if (MBEDTLS_MODE_GCM == ctx->cipher_info->mode) {
return mbedtls_gcm_starts((mbedtls_gcm_context *) ctx->cipher_ctx, ctx->operation,
ctx->iv, ctx->iv_size, ad, ad_len);
}
#endif
#if defined(MBEDTLS_CHACHAPOLY_C)
if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type) {
int result;
mbedtls_chachapoly_mode_t mode;
mode = (ctx->operation == MBEDTLS_ENCRYPT)
? MBEDTLS_CHACHAPOLY_ENCRYPT
: MBEDTLS_CHACHAPOLY_DECRYPT;
result = mbedtls_chachapoly_starts((mbedtls_chachapoly_context *) ctx->cipher_ctx,
ctx->iv,
mode);
if (result != 0) {
return result;
}
return mbedtls_chachapoly_update_aad((mbedtls_chachapoly_context *) ctx->cipher_ctx,
ad, ad_len);
}
#endif
return 0;
}
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
int mbedtls_cipher_update(mbedtls_cipher_context_t *ctx, const unsigned char *input,
size_t ilen, unsigned char *output, size_t *olen)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t block_size;
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || input != NULL);
CIPHER_VALIDATE_RET(output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto has an API for multipart
* operations, we currently don't make it
* accessible through the cipher layer. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
*olen = 0;
block_size = mbedtls_cipher_get_block_size(ctx);
if (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) {
*olen = ilen;
return mbedtls_gcm_update((mbedtls_gcm_context *) ctx->cipher_ctx, ilen, input,
output);
}
#endif
#if defined(MBEDTLS_CHACHAPOLY_C)
if (ctx->cipher_info->type == MBEDTLS_CIPHER_CHACHA20_POLY1305) {
*olen = ilen;
return mbedtls_chachapoly_update((mbedtls_chachapoly_context *) ctx->cipher_ctx,
ilen, input, output);
}
#endif
if (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)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto has an API for multipart
* operations, we currently don't make it
* accessible through the cipher layer. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
*olen = 0;
if (MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
MBEDTLS_MODE_XTS == ctx->cipher_info->mode ||
MBEDTLS_MODE_STREAM == ctx->cipher_info->mode) {
return 0;
}
if ((MBEDTLS_CIPHER_CHACHA20 == ctx->cipher_info->type) ||
(MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type)) {
return 0;
}
if (MBEDTLS_MODE_ECB == ctx->cipher_info->mode) {
if (ctx->unprocessed_len != 0) {
return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
}
return 0;
}
#if defined(MBEDTLS_CIPHER_MODE_CBC)
if (MBEDTLS_MODE_CBC == ctx->cipher_info->mode) {
int ret = 0;
if (MBEDTLS_ENCRYPT == ctx->operation) {
/* check for 'no padding' mode */
if (NULL == ctx->add_padding) {
if (0 != ctx->unprocessed_len) {
return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
}
return 0;
}
ctx->add_padding(ctx->unprocessed_data, mbedtls_cipher_get_iv_size(ctx),
ctx->unprocessed_len);
} else if (mbedtls_cipher_get_block_size(ctx) != ctx->unprocessed_len) {
/*
* For decrypt operations, expect a full block,
* or an empty block if no padding
*/
if (NULL == ctx->add_padding && 0 == ctx->unprocessed_len) {
return 0;
}
return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
}
/* cipher block */
if (0 != (ret = ctx->cipher_info->base->cbc_func(ctx->cipher_ctx,
ctx->operation,
mbedtls_cipher_get_block_size(ctx),
ctx->iv,
ctx->unprocessed_data, output))) {
return ret;
}
/* Set output size for decryption */
if (MBEDTLS_DECRYPT == ctx->operation) {
return ctx->get_padding(output, mbedtls_cipher_get_block_size(ctx),
olen);
}
/* Set output size for encryption */
*olen = mbedtls_cipher_get_block_size(ctx);
return 0;
}
#else
((void) output);
#endif /* MBEDTLS_CIPHER_MODE_CBC */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
int mbedtls_cipher_set_padding_mode(mbedtls_cipher_context_t *ctx,
mbedtls_cipher_padding_t mode)
{
CIPHER_VALIDATE_RET(ctx != NULL);
if (NULL == ctx->cipher_info || MBEDTLS_MODE_CBC != ctx->cipher_info->mode) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto knows about CBC padding
* schemes, we currently don't make them
* accessible through the cipher layer. */
if (mode != MBEDTLS_PADDING_NONE) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
switch (mode) {
#if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
case MBEDTLS_PADDING_PKCS7:
ctx->add_padding = add_pkcs_padding;
ctx->get_padding = get_pkcs_padding;
break;
#endif
#if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
case MBEDTLS_PADDING_ONE_AND_ZEROS:
ctx->add_padding = add_one_and_zeros_padding;
ctx->get_padding = get_one_and_zeros_padding;
break;
#endif
#if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
case MBEDTLS_PADDING_ZEROS_AND_LEN:
ctx->add_padding = add_zeros_and_len_padding;
ctx->get_padding = get_zeros_and_len_padding;
break;
#endif
#if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
case MBEDTLS_PADDING_ZEROS:
ctx->add_padding = add_zeros_padding;
ctx->get_padding = get_zeros_padding;
break;
#endif
case MBEDTLS_PADDING_NONE:
ctx->add_padding = NULL;
ctx->get_padding = get_no_padding;
break;
default:
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
return 0;
}
#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
int mbedtls_cipher_write_tag(mbedtls_cipher_context_t *ctx,
unsigned char *tag, size_t tag_len)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(tag_len == 0 || tag != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
if (MBEDTLS_ENCRYPT != ctx->operation) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto has an API for multipart
* operations, we currently don't make it
* accessible through the cipher layer. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_GCM_C)
if (MBEDTLS_MODE_GCM == ctx->cipher_info->mode) {
return mbedtls_gcm_finish((mbedtls_gcm_context *) ctx->cipher_ctx,
tag, tag_len);
}
#endif
#if defined(MBEDTLS_CHACHAPOLY_C)
if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type) {
/* Don't allow truncated MAC for Poly1305 */
if (tag_len != 16U) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
return mbedtls_chachapoly_finish(
(mbedtls_chachapoly_context *) ctx->cipher_ctx, tag);
}
#endif
return 0;
}
int mbedtls_cipher_check_tag(mbedtls_cipher_context_t *ctx,
const unsigned char *tag, size_t tag_len)
{
unsigned char check_tag[16];
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(tag_len == 0 || tag != NULL);
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
if (MBEDTLS_DECRYPT != ctx->operation) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* While PSA Crypto has an API for multipart
* operations, we currently don't make it
* accessible through the cipher layer. */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/* 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) {
if (tag_len > sizeof(check_tag)) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
if (0 != (ret = mbedtls_gcm_finish(
(mbedtls_gcm_context *) ctx->cipher_ctx,
check_tag, tag_len))) {
return ret;
}
/* Check the tag in "constant-time" */
if (mbedtls_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;
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(iv_len == 0 || iv != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || input != NULL);
CIPHER_VALIDATE_RET(output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (ctx->psa_enabled == 1) {
/* As in the non-PSA case, we don't check that
* a key has been set. If not, the key slot will
* still be in its default state of 0, which is
* guaranteed to be invalid, hence the PSA-call
* below will gracefully fail. */
mbedtls_cipher_context_psa * const cipher_psa =
(mbedtls_cipher_context_psa *) ctx->cipher_ctx;
psa_status_t status;
psa_cipher_operation_t cipher_op = PSA_CIPHER_OPERATION_INIT;
size_t part_len;
if (ctx->operation == MBEDTLS_DECRYPT) {
status = psa_cipher_decrypt_setup(&cipher_op,
cipher_psa->slot,
cipher_psa->alg);
} else if (ctx->operation == MBEDTLS_ENCRYPT) {
status = psa_cipher_encrypt_setup(&cipher_op,
cipher_psa->slot,
cipher_psa->alg);
} else {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
/* In the following, we can immediately return on an error,
* because the PSA Crypto API guarantees that cipher operations
* are terminated by unsuccessful calls to psa_cipher_update(),
* and by any call to psa_cipher_finish(). */
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED;
}
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_CIPHER_HW_ACCEL_FAILED;
}
}
status = psa_cipher_update(&cipher_op,
input, ilen,
output, ilen, olen);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED;
}
status = psa_cipher_finish(&cipher_op,
output + *olen, ilen - *olen,
&part_len);
if (status != PSA_SUCCESS) {
return MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED;
}
*olen += part_len;
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if ((ret = mbedtls_cipher_set_iv(ctx, iv, iv_len)) != 0) {
return ret;
}
if ((ret = mbedtls_cipher_reset(ctx)) != 0) {
return ret;
}
if ((ret = mbedtls_cipher_update(ctx, input, ilen,
output, olen)) != 0) {
return ret;
}
if ((ret = mbedtls_cipher_finish(ctx, output + *olen,
&finish_olen)) != 0) {
return ret;
}
*olen += finish_olen;
return 0;
}
#if defined(MBEDTLS_CIPHER_MODE_AEAD)
/*
* Packet-oriented encryption for AEAD modes: internal function shared by
* mbedtls_cipher_auth_encrypt() and 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_CIPHER_HW_ACCEL_FAILED;
}
*olen -= tag_len;
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_GCM_C)
if (MBEDTLS_MODE_GCM == ctx->cipher_info->mode) {
*olen = ilen;
return mbedtls_gcm_crypt_and_tag(ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT,
ilen, iv, iv_len, ad, ad_len,
input, output, tag_len, tag);
}
#endif /* MBEDTLS_GCM_C */
#if defined(MBEDTLS_CCM_C)
if (MBEDTLS_MODE_CCM == ctx->cipher_info->mode) {
*olen = ilen;
return mbedtls_ccm_encrypt_and_tag(ctx->cipher_ctx, ilen,
iv, iv_len, ad, ad_len, input, output,
tag, tag_len);
}
#endif /* MBEDTLS_CCM_C */
#if defined(MBEDTLS_CHACHAPOLY_C)
if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type) {
/* ChachaPoly has fixed length nonce and MAC (tag) */
if ((iv_len != ctx->cipher_info->iv_size) ||
(tag_len != 16U)) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
*olen = ilen;
return mbedtls_chachapoly_encrypt_and_tag(ctx->cipher_ctx,
ilen, iv, ad, ad_len, input, output, tag);
}
#endif /* MBEDTLS_CHACHAPOLY_C */
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
/*
* Packet-oriented encryption for AEAD modes: internal function shared by
* mbedtls_cipher_auth_encrypt() and 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_CIPHER_HW_ACCEL_FAILED;
}
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_GCM_C)
if (MBEDTLS_MODE_GCM == ctx->cipher_info->mode) {
int ret = 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;
}
#if !defined(MBEDTLS_DEPRECATED_REMOVED)
/*
* Packet-oriented encryption for AEAD modes: public legacy function.
*/
int mbedtls_cipher_auth_encrypt(mbedtls_cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len,
const unsigned char *ad, size_t ad_len,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen,
unsigned char *tag, size_t tag_len)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(iv_len == 0 || iv != NULL);
CIPHER_VALIDATE_RET(ad_len == 0 || ad != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || input != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
CIPHER_VALIDATE_RET(tag_len == 0 || tag != NULL);
return mbedtls_cipher_aead_encrypt(ctx, iv, iv_len, ad, ad_len,
input, ilen, output, olen,
tag, tag_len);
}
/*
* Packet-oriented decryption for AEAD modes: public legacy function.
*/
int mbedtls_cipher_auth_decrypt(mbedtls_cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len,
const unsigned char *ad, size_t ad_len,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen,
const unsigned char *tag, size_t tag_len)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(iv_len == 0 || iv != NULL);
CIPHER_VALIDATE_RET(ad_len == 0 || ad != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || input != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
CIPHER_VALIDATE_RET(tag_len == 0 || tag != NULL);
return mbedtls_cipher_aead_decrypt(ctx, iv, iv_len, ad, ad_len,
input, ilen, output, olen,
tag, tag_len);
}
#endif /* !MBEDTLS_DEPRECATED_REMOVED */
#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)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(iv_len == 0 || iv != NULL);
CIPHER_VALIDATE_RET(ad_len == 0 || ad != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || input != NULL);
CIPHER_VALIDATE_RET(output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
#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)
{
CIPHER_VALIDATE_RET(ctx != NULL);
CIPHER_VALIDATE_RET(iv_len == 0 || iv != NULL);
CIPHER_VALIDATE_RET(ad_len == 0 || ad != NULL);
CIPHER_VALIDATE_RET(ilen == 0 || input != NULL);
CIPHER_VALIDATE_RET(output_len == 0 || output != NULL);
CIPHER_VALIDATE_RET(olen != NULL);
#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 */
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