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/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 <openssl/crypto.h> /* for CRYPTO_memcmp */
#include <string.h>
#include "block_device.h"
#include "block_mac.h"
#include "transaction.h"
static size_t block_mac_block_size(const struct fs* fs) {
size_t size = fs->block_num_size;
assert(size);
assert(size <= sizeof(data_block_t));
return size;
}
static size_t block_mac_mac_size(const struct fs* fs) {
size_t size = fs->mac_size;
assert(size);
assert(size <= sizeof(struct mac));
return size;
}
void block_mac_clear(const struct transaction* tr, struct block_mac* dest) {
memset(dest, 0, block_mac_block_size(tr->fs) + block_mac_mac_size(tr->fs));
}
data_block_t block_mac_to_block_fs(const struct fs* fs,
const struct block_mac* block_mac) {
data_block_t block = 0;
memcpy(&block, block_mac->data, block_mac_block_size(fs));
return block;
}
data_block_t block_mac_to_block(const struct transaction* tr,
const struct block_mac* block_mac) {
assert(tr);
return block_mac_to_block_fs(tr->fs, block_mac);
}
const void* block_mac_to_mac(const struct transaction* tr,
const struct block_mac* block_mac) {
return block_mac->data + block_mac_block_size(tr->fs);
}
void block_mac_set_block(const struct transaction* tr,
struct block_mac* block_mac,
data_block_t block) {
memcpy(block_mac->data, &block, block_mac_block_size(tr->fs));
}
void block_mac_set_mac(const struct transaction* tr,
struct block_mac* block_mac,
const struct mac* mac) {
memcpy(block_mac->data + block_mac_block_size(tr->fs), mac,
block_mac_mac_size(tr->fs));
}
bool block_mac_eq(const struct transaction* tr,
const struct block_mac* a,
const struct block_mac* b) {
return !CRYPTO_memcmp(
a, b, block_mac_block_size(tr->fs) + block_mac_mac_size(tr->fs));
}
void block_mac_copy(const struct transaction* tr,
struct block_mac* dest,
const struct block_mac* src) {
memcpy(dest, src,
block_mac_block_size(tr->fs) + block_mac_mac_size(tr->fs));
}
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