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/* Copyright 2018 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <openssl/evp.h>
#define HIDE_EC_STDLIB
#include "dcrypto.h"
#include "registers.h"
enum dcrypto_result DCRYPTO_aes_ctr(uint8_t *out, const uint8_t *key,
uint32_t key_bits, const uint8_t *iv,
const uint8_t *in, size_t in_len)
{
EVP_CIPHER_CTX *ctx;
enum dcrypto_result ret = DCRYPTO_FAIL;
int out_len = 0;
ctx = EVP_CIPHER_CTX_new();
if (!ctx)
return DCRYPTO_FAIL;
if (EVP_EncryptInit_ex(ctx, EVP_aes_256_ctr(), NULL, key, iv) != 1)
goto cleanup;
if (EVP_EncryptUpdate(ctx, out, &out_len, in, in_len) != 1)
goto cleanup;
if (EVP_EncryptFinal(ctx, out + out_len, &out_len) != 1)
goto cleanup;
ret = DCRYPTO_OK;
cleanup:
EVP_CIPHER_CTX_free(ctx);
return ret;
}
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