1/*
2 * Copyright (c) 2024-2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15#include "securec.h"
16#include "fs_verity_digest.h"
17#include "signature_tools_log.h"
18
19namespace OHOS {
20namespace SignatureTools {
21const std::string FsVerityDigest::FSVERITY_DIGEST_MAGIC = "FSVerity";
22const int FsVerityDigest::DIGEST_HEADER_SIZE = 12;
23
24void FsVerityDigest::GetFsVerityDigest(int8_t algoID, std::vector<int8_t>& digest,
25                                       std::vector<int8_t> &ret)
26{
27    const int size = DIGEST_HEADER_SIZE + digest.size();
28    if (size <= 0) {
29        ret = std::vector<int8_t>();
30        return;
31    }
32    std::unique_ptr<ByteBuffer> buffer = std::make_unique<ByteBuffer>(ByteBuffer(size));
33    buffer->PutData(FSVERITY_DIGEST_MAGIC.c_str(), (int32_t)FSVERITY_DIGEST_MAGIC.length());
34    buffer->PutInt16(algoID);
35    buffer->PutInt16((int16_t)digest.size());
36    buffer->PutData(digest.data(), digest.size());
37    buffer->Flip();
38    char dataArr[size];
39    if (memset_s(dataArr, sizeof(dataArr), 0, sizeof(dataArr)) != RET_OK) {
40        SIGNATURE_TOOLS_LOGE("memcpy_s failed");
41        ret = std::vector<int8_t>();
42        return;
43    }
44    buffer->GetData(dataArr, size);
45    ret = std::vector<int8_t>(dataArr, dataArr + size);
46    return;
47}
48} // namespace SignatureTools
49} // namespace OHOS
50