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cipher.c
1680 lines (1412 loc) · 57.9 KB
/
cipher.c
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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 OR GPL-2.0-or-later
*/
#include "common.h"
#if defined(MBEDTLS_CIPHER_C)
#include "mbedtls/cipher.h"
#include "cipher_wrap.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "mbedtls/constant_time.h"
#include "constant_time_internal.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) && !defined(MBEDTLS_DEPRECATED_REMOVED)
#include "psa/crypto.h"
#endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
#if defined(MBEDTLS_NIST_KW_C)
#include "mbedtls/nist_kw.h"
#endif
#include "mbedtls/platform.h"
static int supported_init = 0;
static inline const mbedtls_cipher_base_t *mbedtls_cipher_get_base(
const mbedtls_cipher_info_t *info)
{
return mbedtls_cipher_base_lookup_table[info->base_idx];
}
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 (mbedtls_cipher_get_base(def->info)->cipher == cipher_id &&
mbedtls_cipher_info_get_key_bitlen(def->info) == (unsigned) key_bitlen &&
def->info->mode == mode) {
return def->info;
}
}
return NULL;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
static inline psa_key_type_t mbedtls_psa_translate_cipher_type(
mbedtls_cipher_type_t cipher)
{
switch (cipher) {
case MBEDTLS_CIPHER_AES_128_CCM:
case MBEDTLS_CIPHER_AES_192_CCM:
case MBEDTLS_CIPHER_AES_256_CCM:
case MBEDTLS_CIPHER_AES_128_CCM_STAR_NO_TAG:
case MBEDTLS_CIPHER_AES_192_CCM_STAR_NO_TAG:
case MBEDTLS_CIPHER_AES_256_CCM_STAR_NO_TAG:
case MBEDTLS_CIPHER_AES_128_GCM:
case MBEDTLS_CIPHER_AES_192_GCM:
case MBEDTLS_CIPHER_AES_256_GCM:
case MBEDTLS_CIPHER_AES_128_CBC:
case MBEDTLS_CIPHER_AES_192_CBC:
case MBEDTLS_CIPHER_AES_256_CBC:
case MBEDTLS_CIPHER_AES_128_ECB:
case MBEDTLS_CIPHER_AES_192_ECB:
case MBEDTLS_CIPHER_AES_256_ECB:
return PSA_KEY_TYPE_AES;
/* ARIA not yet supported in PSA. */
/* case MBEDTLS_CIPHER_ARIA_128_CCM:
case MBEDTLS_CIPHER_ARIA_192_CCM:
case MBEDTLS_CIPHER_ARIA_256_CCM:
case MBEDTLS_CIPHER_ARIA_128_CCM_STAR_NO_TAG:
case MBEDTLS_CIPHER_ARIA_192_CCM_STAR_NO_TAG:
case MBEDTLS_CIPHER_ARIA_256_CCM_STAR_NO_TAG:
case MBEDTLS_CIPHER_ARIA_128_GCM:
case MBEDTLS_CIPHER_ARIA_192_GCM:
case MBEDTLS_CIPHER_ARIA_256_GCM:
case MBEDTLS_CIPHER_ARIA_128_CBC:
case MBEDTLS_CIPHER_ARIA_192_CBC:
case MBEDTLS_CIPHER_ARIA_256_CBC:
return( PSA_KEY_TYPE_ARIA ); */
default:
return 0;
}
}
static inline psa_algorithm_t mbedtls_psa_translate_cipher_mode(
mbedtls_cipher_mode_t mode, size_t taglen)
{
switch (mode) {
case MBEDTLS_MODE_ECB:
return PSA_ALG_ECB_NO_PADDING;
case MBEDTLS_MODE_GCM:
return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, taglen);
case MBEDTLS_MODE_CCM:
return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen);
case MBEDTLS_MODE_CCM_STAR_NO_TAG:
return PSA_ALG_CCM_STAR_NO_TAG;
case MBEDTLS_MODE_CBC:
if (taglen == 0) {
return PSA_ALG_CBC_NO_PADDING;
} else {
return 0;
}
default:
return 0;
}
}
#endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
void mbedtls_cipher_init(mbedtls_cipher_context_t *ctx)
{
memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
}
void mbedtls_cipher_free(mbedtls_cipher_context_t *ctx)
{
if (ctx == NULL) {
return;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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_zeroize_and_free(cipher_psa, sizeof(*cipher_psa));
}
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t));
return;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */
#if defined(MBEDTLS_CMAC_C)
if (ctx->cmac_ctx) {
mbedtls_zeroize_and_free(ctx->cmac_ctx,
sizeof(mbedtls_cmac_context_t));
}
#endif
if (ctx->cipher_ctx) {
mbedtls_cipher_get_base(ctx->cipher_info)->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)
{
if (cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
memset(ctx, 0, sizeof(mbedtls_cipher_context_t));
if (mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func != NULL) {
ctx->cipher_ctx = mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func();
if (ctx->cipher_ctx == NULL) {
return MBEDTLS_ERR_CIPHER_ALLOC_FAILED;
}
}
ctx->cipher_info = cipher_info;
return 0;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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(((mbedtls_cipher_mode_t) cipher_info->mode), taglen);
if (alg == 0) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
if (mbedtls_psa_translate_cipher_type(((mbedtls_cipher_type_t) 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 && !MBEDTLS_DEPRECATED_REMOVED */
int mbedtls_cipher_setkey(mbedtls_cipher_context_t *ctx,
const unsigned char *key,
int key_bitlen,
const mbedtls_operation_t operation)
{
if (operation != MBEDTLS_ENCRYPT && operation != MBEDTLS_DECRYPT) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) &&
MBEDTLS_DECRYPT == operation) {
return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#endif
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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(
((mbedtls_cipher_type_t) 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,
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_PLATFORM_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 && !MBEDTLS_DEPRECATED_REMOVED */
if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN) == 0 &&
(int) mbedtls_cipher_info_get_key_bitlen(ctx->cipher_info) != key_bitlen) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
ctx->key_bitlen = key_bitlen;
ctx->operation = operation;
#if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT)
/*
* For OFB, CFB and CTR mode always use the encryption key schedule
*/
if (MBEDTLS_ENCRYPT == operation ||
MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) ||
MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key,
ctx->key_bitlen);
}
if (MBEDTLS_DECRYPT == operation) {
return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_dec_func(ctx->cipher_ctx, key,
ctx->key_bitlen);
}
#else
if (operation == MBEDTLS_ENCRYPT || operation == MBEDTLS_DECRYPT) {
return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key,
ctx->key_bitlen);
}
#endif
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
int mbedtls_cipher_set_iv(mbedtls_cipher_context_t *ctx,
const unsigned char *iv,
size_t iv_len)
{
size_t actual_iv_size;
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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 && !MBEDTLS_DEPRECATED_REMOVED */
/* 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 = mbedtls_cipher_info_get_iv_size(ctx->cipher_info);
/* 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 (((mbedtls_cipher_type_t) 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 (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305 &&
iv_len != 12) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#endif
#endif
#if defined(MBEDTLS_GCM_C)
if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
return mbedtls_gcm_starts((mbedtls_gcm_context *) ctx->cipher_ctx,
ctx->operation,
iv, iv_len);
}
#endif
#if defined(MBEDTLS_CCM_C)
if (MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
int set_lengths_result;
int ccm_star_mode;
set_lengths_result = mbedtls_ccm_set_lengths(
(mbedtls_ccm_context *) ctx->cipher_ctx,
0, 0, 0);
if (set_lengths_result != 0) {
return set_lengths_result;
}
if (ctx->operation == MBEDTLS_DECRYPT) {
ccm_star_mode = MBEDTLS_CCM_STAR_DECRYPT;
} else if (ctx->operation == MBEDTLS_ENCRYPT) {
ccm_star_mode = MBEDTLS_CCM_STAR_ENCRYPT;
} else {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
return mbedtls_ccm_starts((mbedtls_ccm_context *) ctx->cipher_ctx,
ccm_star_mode,
iv, iv_len);
}
#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)
{
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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 && !MBEDTLS_DEPRECATED_REMOVED */
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)
{
if (ctx->cipher_info == NULL) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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 && !MBEDTLS_DEPRECATED_REMOVED */
#if defined(MBEDTLS_GCM_C)
if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) {
return mbedtls_gcm_update_ad((mbedtls_gcm_context *) ctx->cipher_ctx,
ad, ad_len);
}
#endif
#if defined(MBEDTLS_CHACHAPOLY_C)
if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) 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) && !defined(MBEDTLS_DEPRECATED_REMOVED)
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 && !MBEDTLS_DEPRECATED_REMOVED */
*olen = 0;
block_size = mbedtls_cipher_get_block_size(ctx);
if (0 == block_size) {
return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
}
if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_ECB) {
if (ilen != block_size) {
return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED;
}
*olen = ilen;
if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ecb_func(ctx->cipher_ctx,
ctx->operation, input,
output))) {
return ret;
}
return 0;
}
#if defined(MBEDTLS_GCM_C)
if (((mbedtls_cipher_mode_t) 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 (((mbedtls_cipher_mode_t) 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 (((mbedtls_cipher_type_t) 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 (((mbedtls_cipher_mode_t) 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 = mbedtls_cipher_get_base(ctx->cipher_info)->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 = mbedtls_cipher_get_base(ctx->cipher_info)->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 (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CFB) {
if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->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 (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_OFB) {
if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->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 (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CTR) {
if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->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 (((mbedtls_cipher_mode_t) 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 = mbedtls_cipher_get_base(ctx->cipher_info)->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 (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_STREAM) {
if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->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;
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;
mbedtls_ct_condition_t bad = mbedtls_ct_uint_gt(padding_len, input_len);
bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(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++) {
mbedtls_ct_condition_t in_padding = mbedtls_ct_uint_ge(i, pad_idx);
mbedtls_ct_condition_t different = mbedtls_ct_uint_ne(input[i], padding_len);
bad = mbedtls_ct_bool_or(bad, mbedtls_ct_bool_and(in_padding, different));
}
return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING);
}
#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)
{
if (NULL == input || NULL == data_len) {
return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
}
mbedtls_ct_condition_t in_padding = MBEDTLS_CT_TRUE;
mbedtls_ct_condition_t bad = MBEDTLS_CT_TRUE;
*data_len = 0;
for (ptrdiff_t i = (ptrdiff_t) (input_len) - 1; i >= 0; i--) {
mbedtls_ct_condition_t is_nonzero = mbedtls_ct_bool(input[i]);
mbedtls_ct_condition_t hit_first_nonzero = mbedtls_ct_bool_and(is_nonzero, in_padding);
*data_len = mbedtls_ct_size_if(hit_first_nonzero, i, *data_len);
bad = mbedtls_ct_bool_if(hit_first_nonzero, mbedtls_ct_uint_ne(input[i], 0x80), bad);
in_padding = mbedtls_ct_bool_and(in_padding, mbedtls_ct_bool_not(is_nonzero));
}
return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING);
}
#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;
mbedtls_ct_condition_t bad;
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 = mbedtls_ct_uint_gt(padding_len, input_len);
bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(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++) {
mbedtls_ct_condition_t is_padding = mbedtls_ct_uint_ge(i, pad_idx);
mbedtls_ct_condition_t nonzero_pad_byte;
nonzero_pad_byte = mbedtls_ct_bool_if_else_0(is_padding, mbedtls_ct_bool(input[i]));
bad = mbedtls_ct_bool_or(bad, nonzero_pad_byte);
}
return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING);
}
#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)
{
memset(output + data_len, 0, output_len - data_len);
}
static int get_zeros_padding(unsigned char *input, size_t input_len,
size_t *data_len)
{
size_t i;
mbedtls_ct_condition_t done = MBEDTLS_CT_FALSE, 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 = mbedtls_ct_bool_or(done, mbedtls_ct_uint_ne(input[i-1], 0));
*data_len = mbedtls_ct_size_if(mbedtls_ct_bool_ne(done, prev_done), i, *data_len);
}
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)
{