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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 "dcrypto.h"
#include "util.h"
void app_compute_hash(const void *p_buf, size_t num_bytes, void *p_hash,
size_t hash_len)
{
uint8_t digest[SHA256_DIGEST_SIZE];
/*
* Use the built in dcrypto engine to generate the sha1 hash of the
* buffer.
*/
DCRYPTO_SHA256_hash(p_buf, num_bytes, digest);
memcpy(p_hash, digest, MIN(hash_len, sizeof(digest)));
if (hash_len > sizeof(digest))
memset((uint8_t *)p_hash + sizeof(digest), 0,
hash_len - sizeof(digest));
}
int app_cipher(const void *salt_p, void *out_p, const void *in_p, size_t size)
{
/* See README.md for why this is not a real encryption.. */
size_t i;
const uint8_t *src;
const uint8_t *salt;
uint8_t *dst;
src = in_p;
salt = salt_p;
dst = out_p;
for (i = 0; i < size; i++)
dst[i] = src[i] ^ salt[i & 7];
return 1;
}
int crypto_enabled(void)
{
return 1;
}
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