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mbedtls/library/psa_crypto_cipher.c
Gilles Peskine bc3f917fb3 crypto_config.h: Don't list mechanisms that are not implemented 
Don't list mechanisms that are not implemented in
`include/psa/crypto_config.h`, even commented out. Uncommenting them
wouldn't help anyway: they don't work. Having them listed, even commented
out, causes `find_dependencies_not_implemented()` in `psa_test_case.py` to
consider those mechanisms to be implemented, and thus causes
`generate_psa_tests.py` to generate test cases that cannot be executed.

The affected mechanisms are:

* `PSA_ALG_CBC_MAC` (`PSA_WANT_ALG_CBC_MAC`)
* `PSA_ALG_XTS` (`PSA_WANT_ALG_XTS`)
* `PSA_ECC_FAMILY_SECP_K1` 224-bit (`PSA_WANT_ECC_SECP_K1_224`)

Also remove the affected mechanisms from configuration adjustment files,
since that is code that can never be triggered.

There were already no generated test cases for SECP224K1 because
`PSA_WANT_ECC_SECP_K1_224` was already detected as a dependency that cannot
be implemented, because that is not a valid size: PSA defines SECP224K1 as
225-bit, and `crypto_knowledge.py` follows suite, so `generate_psa_tests.py`
saw `PSA_WANT_ECC_SECP_K1_225` in its enumeration but skipped it because it
was never mentioned in `crypto_config.h`.

This causes generated PSA tests to no longer include positive test cases for
`PSA_ALG_CBC_MAC` and `PSA_ALG_XTS`.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2024-12-24 20:03:29 +01:00

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/*
* PSA cipher driver entry points
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "common.h"
#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "psa_crypto_cipher.h"
#include "psa_crypto_core.h"
#include "psa_crypto_random_impl.h"
#include "mbedtls/cipher.h"
#include "mbedtls/error.h"
#include <string.h>
/* mbedtls_cipher_values_from_psa() below only checks if the proper build symbols
* are enabled, but it does not provide any compatibility check between them
* (i.e. if the specified key works with the specified algorithm). This helper
* function is meant to provide this support.
* mbedtls_cipher_info_from_psa() might be used for the same purpose, but it
* requires CIPHER_C to be enabled.
*/
static psa_status_t mbedtls_cipher_validate_values(
psa_algorithm_t alg,
psa_key_type_t key_type)
{
/* Reduce code size - hinting to the compiler about what it can assume allows the compiler to
eliminate bits of the logic below. */
#if !defined(PSA_WANT_KEY_TYPE_AES)
MBEDTLS_ASSUME(key_type != PSA_KEY_TYPE_AES);
#endif
#if !defined(PSA_WANT_KEY_TYPE_ARIA)
MBEDTLS_ASSUME(key_type != PSA_KEY_TYPE_ARIA);
#endif
#if !defined(PSA_WANT_KEY_TYPE_CAMELLIA)
MBEDTLS_ASSUME(key_type != PSA_KEY_TYPE_CAMELLIA);
#endif
#if !defined(PSA_WANT_KEY_TYPE_CHACHA20)
MBEDTLS_ASSUME(key_type != PSA_KEY_TYPE_CHACHA20);
#endif
#if !defined(PSA_WANT_KEY_TYPE_DES)
MBEDTLS_ASSUME(key_type != PSA_KEY_TYPE_DES);
#endif
#if !defined(PSA_WANT_ALG_CCM)
MBEDTLS_ASSUME(alg != PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, 0));
#endif
#if !defined(PSA_WANT_ALG_GCM)
MBEDTLS_ASSUME(alg != PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, 0));
#endif
#if !defined(PSA_WANT_ALG_STREAM_CIPHER)
MBEDTLS_ASSUME(alg != PSA_ALG_STREAM_CIPHER);
#endif
#if !defined(PSA_WANT_ALG_CHACHA20_POLY1305)
MBEDTLS_ASSUME(alg != PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CHACHA20_POLY1305, 0));
#endif
#if !defined(PSA_WANT_ALG_CCM_STAR_NO_TAG)
MBEDTLS_ASSUME(alg != PSA_ALG_CCM_STAR_NO_TAG);
#endif
#if !defined(PSA_WANT_ALG_CTR)
MBEDTLS_ASSUME(alg != PSA_ALG_CTR);
#endif
#if !defined(PSA_WANT_ALG_CFB)
MBEDTLS_ASSUME(alg != PSA_ALG_CFB);
#endif
#if !defined(PSA_WANT_ALG_OFB)
MBEDTLS_ASSUME(alg != PSA_ALG_OFB);
#endif
#if !defined(PSA_WANT_ALG_ECB_NO_PADDING)
MBEDTLS_ASSUME(alg != PSA_ALG_ECB_NO_PADDING);
#endif
#if !defined(PSA_WANT_ALG_CBC_NO_PADDING)
MBEDTLS_ASSUME(alg != PSA_ALG_CBC_NO_PADDING);
#endif
#if !defined(PSA_WANT_ALG_CBC_PKCS7)
MBEDTLS_ASSUME(alg != PSA_ALG_CBC_PKCS7);
#endif
#if !defined(PSA_WANT_ALG_CMAC)
MBEDTLS_ASSUME(alg != PSA_ALG_CMAC);
#endif
if (alg == PSA_ALG_STREAM_CIPHER ||
alg == PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CHACHA20_POLY1305, 0)) {
if (key_type == PSA_KEY_TYPE_CHACHA20) {
return PSA_SUCCESS;
}
}
if (alg == PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, 0) ||
alg == PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, 0) ||
alg == PSA_ALG_CCM_STAR_NO_TAG) {
if (key_type == PSA_KEY_TYPE_AES ||
key_type == PSA_KEY_TYPE_ARIA ||
key_type == PSA_KEY_TYPE_CAMELLIA) {
return PSA_SUCCESS;
}
}
if (alg == PSA_ALG_CTR ||
alg == PSA_ALG_CFB ||
alg == PSA_ALG_OFB ||
alg == PSA_ALG_XTS ||
alg == PSA_ALG_ECB_NO_PADDING ||
alg == PSA_ALG_CBC_NO_PADDING ||
alg == PSA_ALG_CBC_PKCS7 ||
alg == PSA_ALG_CMAC) {
if (key_type == PSA_KEY_TYPE_AES ||
key_type == PSA_KEY_TYPE_ARIA ||
key_type == PSA_KEY_TYPE_DES ||
key_type == PSA_KEY_TYPE_CAMELLIA) {
return PSA_SUCCESS;
}
}
return PSA_ERROR_NOT_SUPPORTED;
}
psa_status_t mbedtls_cipher_values_from_psa(
psa_algorithm_t alg,
psa_key_type_t key_type,
size_t *key_bits,
mbedtls_cipher_mode_t *mode,
mbedtls_cipher_id_t *cipher_id)
{
mbedtls_cipher_id_t cipher_id_tmp;
/* Only DES modifies key_bits */
#if !defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
(void) key_bits;
#endif
if (PSA_ALG_IS_AEAD(alg)) {
alg = PSA_ALG_AEAD_WITH_SHORTENED_TAG(alg, 0);
}
if (PSA_ALG_IS_CIPHER(alg) || PSA_ALG_IS_AEAD(alg)) {
switch (alg) {
#if defined(MBEDTLS_PSA_BUILTIN_ALG_STREAM_CIPHER)
case PSA_ALG_STREAM_CIPHER:
*mode = MBEDTLS_MODE_STREAM;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CTR)
case PSA_ALG_CTR:
*mode = MBEDTLS_MODE_CTR;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CFB)
case PSA_ALG_CFB:
*mode = MBEDTLS_MODE_CFB;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_OFB)
case PSA_ALG_OFB:
*mode = MBEDTLS_MODE_OFB;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING)
case PSA_ALG_ECB_NO_PADDING:
*mode = MBEDTLS_MODE_ECB;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING)
case PSA_ALG_CBC_NO_PADDING:
*mode = MBEDTLS_MODE_CBC;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7)
case PSA_ALG_CBC_PKCS7:
*mode = MBEDTLS_MODE_CBC;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM_STAR_NO_TAG)
case PSA_ALG_CCM_STAR_NO_TAG:
*mode = MBEDTLS_MODE_CCM_STAR_NO_TAG;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, 0):
*mode = MBEDTLS_MODE_CCM;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, 0):
*mode = MBEDTLS_MODE_GCM;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CHACHA20_POLY1305, 0):
*mode = MBEDTLS_MODE_CHACHAPOLY;
break;
#endif
default:
return PSA_ERROR_NOT_SUPPORTED;
}
} else if (alg == PSA_ALG_CMAC) {
*mode = MBEDTLS_MODE_ECB;
} else {
return PSA_ERROR_NOT_SUPPORTED;
}
switch (key_type) {
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_AES)
case PSA_KEY_TYPE_AES:
cipher_id_tmp = MBEDTLS_CIPHER_ID_AES;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ARIA)
case PSA_KEY_TYPE_ARIA:
cipher_id_tmp = MBEDTLS_CIPHER_ID_ARIA;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
case PSA_KEY_TYPE_DES:
/* key_bits is 64 for Single-DES, 128 for two-key Triple-DES,
* and 192 for three-key Triple-DES. */
if (*key_bits == 64) {
cipher_id_tmp = MBEDTLS_CIPHER_ID_DES;
} else {
cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES;
}
/* mbedtls doesn't recognize two-key Triple-DES as an algorithm,
* but two-key Triple-DES is functionally three-key Triple-DES
* with K1=K3, so that's how we present it to mbedtls. */
if (*key_bits == 128) {
*key_bits = 192;
}
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CAMELLIA)
case PSA_KEY_TYPE_CAMELLIA:
cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20)
case PSA_KEY_TYPE_CHACHA20:
cipher_id_tmp = MBEDTLS_CIPHER_ID_CHACHA20;
break;
#endif
default:
return PSA_ERROR_NOT_SUPPORTED;
}
if (cipher_id != NULL) {
*cipher_id = cipher_id_tmp;
}
return mbedtls_cipher_validate_values(alg, key_type);
}
#if defined(MBEDTLS_CIPHER_C)
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
psa_algorithm_t alg,
psa_key_type_t key_type,
size_t key_bits,
mbedtls_cipher_id_t *cipher_id)
{
mbedtls_cipher_mode_t mode;
psa_status_t status;
mbedtls_cipher_id_t cipher_id_tmp = MBEDTLS_CIPHER_ID_NONE;
status = mbedtls_cipher_values_from_psa(alg, key_type, &key_bits, &mode, &cipher_id_tmp);
if (status != PSA_SUCCESS) {
return NULL;
}
if (cipher_id != NULL) {
*cipher_id = cipher_id_tmp;
}
return mbedtls_cipher_info_from_values(cipher_id_tmp, (int) key_bits, mode);
}
#endif /* MBEDTLS_CIPHER_C */
#if defined(MBEDTLS_PSA_BUILTIN_CIPHER)
static psa_status_t psa_cipher_setup(
mbedtls_psa_cipher_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
mbedtls_operation_t cipher_operation)
{
int ret = 0;
size_t key_bits;
const mbedtls_cipher_info_t *cipher_info = NULL;
psa_key_type_t key_type = attributes->type;
(void) key_buffer_size;
mbedtls_cipher_init(&operation->ctx.cipher);
operation->alg = alg;
key_bits = attributes->bits;
cipher_info = mbedtls_cipher_info_from_psa(alg, key_type,
key_bits, NULL);
if (cipher_info == NULL) {
return PSA_ERROR_NOT_SUPPORTED;
}
ret = mbedtls_cipher_setup(&operation->ctx.cipher, cipher_info);
if (ret != 0) {
goto exit;
}
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
if (key_type == PSA_KEY_TYPE_DES && key_bits == 128) {
/* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */
uint8_t keys[24];
memcpy(keys, key_buffer, 16);
memcpy(keys + 16, key_buffer, 8);
ret = mbedtls_cipher_setkey(&operation->ctx.cipher,
keys,
192, cipher_operation);
} else
#endif
{
ret = mbedtls_cipher_setkey(&operation->ctx.cipher, key_buffer,
(int) key_bits, cipher_operation);
}
if (ret != 0) {
goto exit;
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7)
switch (alg) {
case PSA_ALG_CBC_NO_PADDING:
ret = mbedtls_cipher_set_padding_mode(&operation->ctx.cipher,
MBEDTLS_PADDING_NONE);
break;
case PSA_ALG_CBC_PKCS7:
ret = mbedtls_cipher_set_padding_mode(&operation->ctx.cipher,
MBEDTLS_PADDING_PKCS7);
break;
default:
/* The algorithm doesn't involve padding. */
ret = 0;
break;
}
if (ret != 0) {
goto exit;
}
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING ||
MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7 */
operation->block_length = (PSA_ALG_IS_STREAM_CIPHER(alg) ? 1 :
PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type));
operation->iv_length = PSA_CIPHER_IV_LENGTH(key_type, alg);
exit:
return mbedtls_to_psa_error(ret);
}
psa_status_t mbedtls_psa_cipher_encrypt_setup(
mbedtls_psa_cipher_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg)
{
return psa_cipher_setup(operation, attributes,
key_buffer, key_buffer_size,
alg, MBEDTLS_ENCRYPT);
}
psa_status_t mbedtls_psa_cipher_decrypt_setup(
mbedtls_psa_cipher_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg)
{
return psa_cipher_setup(operation, attributes,
key_buffer, key_buffer_size,
alg, MBEDTLS_DECRYPT);
}
psa_status_t mbedtls_psa_cipher_set_iv(
mbedtls_psa_cipher_operation_t *operation,
const uint8_t *iv, size_t iv_length)
{
if (iv_length != operation->iv_length) {
return PSA_ERROR_INVALID_ARGUMENT;
}
return mbedtls_to_psa_error(
mbedtls_cipher_set_iv(&operation->ctx.cipher,
iv, iv_length));
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING)
/** Process input for which the algorithm is set to ECB mode.
*
* This requires manual processing, since the PSA API is defined as being
* able to process arbitrary-length calls to psa_cipher_update() with ECB mode,
* but the underlying mbedtls_cipher_update only takes full blocks.
*
* \param ctx The mbedtls cipher context to use. It must have been
* set up for ECB.
* \param[in] input The input plaintext or ciphertext to process.
* \param input_length The number of bytes to process from \p input.
* This does not need to be aligned to a block boundary.
* If there is a partial block at the end of the input,
* it is stored in \p ctx for future processing.
* \param output The buffer where the output is written. It must be
* at least `BS * floor((p + input_length) / BS)` bytes
* long, where `p` is the number of bytes in the
* unprocessed partial block in \p ctx (with
* `0 <= p <= BS - 1`) and `BS` is the block size.
* \param output_length On success, the number of bytes written to \p output.
* \c 0 on error.
*
* \return #PSA_SUCCESS or an error from a hardware accelerator
*/
static psa_status_t psa_cipher_update_ecb(
mbedtls_cipher_context_t *ctx,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t *output_length)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t block_size = mbedtls_cipher_info_get_block_size(ctx->cipher_info);
size_t internal_output_length = 0;
*output_length = 0;
if (input_length == 0) {
status = PSA_SUCCESS;
goto exit;
}
if (ctx->unprocessed_len > 0) {
/* Fill up to block size, and run the block if there's a full one. */
size_t bytes_to_copy = block_size - ctx->unprocessed_len;
if (input_length < bytes_to_copy) {
bytes_to_copy = input_length;
}
memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]),
input, bytes_to_copy);
input_length -= bytes_to_copy;
input += bytes_to_copy;
ctx->unprocessed_len += bytes_to_copy;
if (ctx->unprocessed_len == block_size) {
status = mbedtls_to_psa_error(
mbedtls_cipher_update(ctx,
ctx->unprocessed_data,
block_size,
output, &internal_output_length));
if (status != PSA_SUCCESS) {
goto exit;
}
output += internal_output_length;
*output_length += internal_output_length;
ctx->unprocessed_len = 0;
}
}
while (input_length >= block_size) {
/* Run all full blocks we have, one by one */
status = mbedtls_to_psa_error(
mbedtls_cipher_update(ctx, input,
block_size,
output, &internal_output_length));
if (status != PSA_SUCCESS) {
goto exit;
}
input_length -= block_size;
input += block_size;
output += internal_output_length;
*output_length += internal_output_length;
}
if (input_length > 0) {
/* Save unprocessed bytes for later processing */
memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]),
input, input_length);
ctx->unprocessed_len += input_length;
}
status = PSA_SUCCESS;
exit:
return status;
}
#endif /* MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING */
psa_status_t mbedtls_psa_cipher_update(
mbedtls_psa_cipher_operation_t *operation,
const uint8_t *input, size_t input_length,
uint8_t *output, size_t output_size, size_t *output_length)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t expected_output_size;
if (!PSA_ALG_IS_STREAM_CIPHER(operation->alg)) {
/* Take the unprocessed partial block left over from previous
* update calls, if any, plus the input to this call. Remove
* the last partial block, if any. You get the data that will be
* output in this call. */
expected_output_size =
(operation->ctx.cipher.unprocessed_len + input_length)
/ operation->block_length * operation->block_length;
} else {
expected_output_size = input_length;
}
if (output_size < expected_output_size) {
return PSA_ERROR_BUFFER_TOO_SMALL;
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING)
if (operation->alg == PSA_ALG_ECB_NO_PADDING) {
/* mbedtls_cipher_update has an API inconsistency: it will only
* process a single block at a time in ECB mode. Abstract away that
* inconsistency here to match the PSA API behaviour. */
status = psa_cipher_update_ecb(&operation->ctx.cipher,
input,
input_length,
output,
output_length);
} else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING */
if (input_length == 0) {
/* There is no input, nothing to be done */
*output_length = 0;
status = PSA_SUCCESS;
} else {
status = mbedtls_to_psa_error(
mbedtls_cipher_update(&operation->ctx.cipher, input,
input_length, output, output_length));
if (*output_length > output_size) {
return PSA_ERROR_CORRUPTION_DETECTED;
}
}
return status;
}
psa_status_t mbedtls_psa_cipher_finish(
mbedtls_psa_cipher_operation_t *operation,
uint8_t *output, size_t output_size, size_t *output_length)
{
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
uint8_t temp_output_buffer[MBEDTLS_MAX_BLOCK_LENGTH];
if (operation->ctx.cipher.unprocessed_len != 0) {
if (operation->alg == PSA_ALG_ECB_NO_PADDING ||
operation->alg == PSA_ALG_CBC_NO_PADDING) {
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
}
status = mbedtls_to_psa_error(
mbedtls_cipher_finish(&operation->ctx.cipher,
temp_output_buffer,
output_length));
if (status != PSA_SUCCESS) {
goto exit;
}
if (*output_length == 0) {
; /* Nothing to copy. Note that output may be NULL in this case. */
} else if (output_size >= *output_length) {
memcpy(output, temp_output_buffer, *output_length);
} else {
status = PSA_ERROR_BUFFER_TOO_SMALL;
}
exit:
mbedtls_platform_zeroize(temp_output_buffer,
sizeof(temp_output_buffer));
return status;
}
psa_status_t mbedtls_psa_cipher_abort(
mbedtls_psa_cipher_operation_t *operation)
{
/* Sanity check (shouldn't happen: operation->alg should
* always have been initialized to a valid value). */
if (!PSA_ALG_IS_CIPHER(operation->alg)) {
return PSA_ERROR_BAD_STATE;
}
mbedtls_cipher_free(&operation->ctx.cipher);
return PSA_SUCCESS;
}
psa_status_t mbedtls_psa_cipher_encrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *iv,
size_t iv_length,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
mbedtls_psa_cipher_operation_t operation = MBEDTLS_PSA_CIPHER_OPERATION_INIT;
size_t update_output_length, finish_output_length;
status = mbedtls_psa_cipher_encrypt_setup(&operation, attributes,
key_buffer, key_buffer_size,
alg);
if (status != PSA_SUCCESS) {
goto exit;
}
if (iv_length > 0) {
status = mbedtls_psa_cipher_set_iv(&operation, iv, iv_length);
if (status != PSA_SUCCESS) {
goto exit;
}
}
status = mbedtls_psa_cipher_update(&operation, input, input_length,
output, output_size,
&update_output_length);
if (status != PSA_SUCCESS) {
goto exit;
}
status = mbedtls_psa_cipher_finish(
&operation,
mbedtls_buffer_offset(output, update_output_length),
output_size - update_output_length, &finish_output_length);
if (status != PSA_SUCCESS) {
goto exit;
}
*output_length = update_output_length + finish_output_length;
exit:
if (status == PSA_SUCCESS) {
status = mbedtls_psa_cipher_abort(&operation);
} else {
mbedtls_psa_cipher_abort(&operation);
}
return status;
}
psa_status_t mbedtls_psa_cipher_decrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
mbedtls_psa_cipher_operation_t operation = MBEDTLS_PSA_CIPHER_OPERATION_INIT;
size_t olength, accumulated_length;
status = mbedtls_psa_cipher_decrypt_setup(&operation, attributes,
key_buffer, key_buffer_size,
alg);
if (status != PSA_SUCCESS) {
goto exit;
}
if (operation.iv_length > 0) {
status = mbedtls_psa_cipher_set_iv(&operation,
input, operation.iv_length);
if (status != PSA_SUCCESS) {
goto exit;
}
}
status = mbedtls_psa_cipher_update(
&operation,
mbedtls_buffer_offset_const(input, operation.iv_length),
input_length - operation.iv_length,
output, output_size, &olength);
if (status != PSA_SUCCESS) {
goto exit;
}
accumulated_length = olength;
status = mbedtls_psa_cipher_finish(
&operation,
mbedtls_buffer_offset(output, accumulated_length),
output_size - accumulated_length, &olength);
if (status != PSA_SUCCESS) {
goto exit;
}
*output_length = accumulated_length + olength;
exit:
if (status == PSA_SUCCESS) {
status = mbedtls_psa_cipher_abort(&operation);
} else {
mbedtls_psa_cipher_abort(&operation);
}
return status;
}
#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
#endif /* MBEDTLS_PSA_CRYPTO_C */
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