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76 lines
2.4 KiB
76 lines
2.4 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "verity/build_verity_tree.h"
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include <sparse/sparse.h>
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#undef NDEBUG
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bool generate_verity_tree(const std::string& data_filename,
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const std::string& verity_filename,
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HashTreeBuilder* builder,
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const std::vector<unsigned char>& salt_content,
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size_t block_size, bool sparse, bool verbose) {
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android::base::unique_fd data_fd(open(data_filename.c_str(), O_RDONLY));
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if (data_fd == -1) {
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PLOG(ERROR) << "failed to open " << data_filename;
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return false;
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}
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struct sparse_file* file;
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if (sparse) {
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file = sparse_file_import(data_fd, false, false);
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} else {
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file = sparse_file_import_auto(data_fd, false, verbose);
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}
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if (!file) {
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LOG(ERROR) << "failed to read file " << data_filename;
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return false;
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}
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int64_t len = sparse_file_len(file, false, false);
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if (len % block_size != 0) {
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LOG(ERROR) << "file size " << len << " is not a multiple of " << block_size
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<< " byte";
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return false;
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}
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// Initialize the builder to compute the hash tree.
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if (!builder->Initialize(len, salt_content)) {
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LOG(ERROR) << "Failed to initialize HashTreeBuilder";
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return false;
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}
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auto hash_callback = [](void* priv, const void* data, size_t len) {
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auto sparse_hasher = static_cast<HashTreeBuilder*>(priv);
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return sparse_hasher->Update(static_cast<const unsigned char*>(data), len)
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? 0
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: 1;
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};
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sparse_file_callback(file, false, false, hash_callback, builder);
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sparse_file_destroy(file);
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if (!builder->BuildHashTree()) {
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return false;
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}
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return builder->WriteHashTreeToFile(verity_filename);
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}
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