94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*
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* Copyright (C) 2021 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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#pragma once
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#include <string>
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#include <vector>
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#include <fs_avb/fs_avb_util.h>
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uint8_t HexDigitToByte(char c);
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bool HexToBytes(const std::string &hex, std::vector<uint8_t> *bytes);
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// The abstract class of SHA algorithms.
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class ShaHasher {
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protected:
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const uint32_t digest_size_;
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ShaHasher(uint32_t digest_size) : digest_size_(digest_size) {}
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public:
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virtual ~ShaHasher() {}
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uint32_t GetDigestSize() const { return digest_size_; }
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virtual bool CalculateDigest(const void *buffer, size_t size,
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const void *salt, uint32_t block_length,
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uint8_t *digest) const = 0;
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};
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template <typename CTX_TYPE>
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class ShaHasherImpl : public ShaHasher {
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private:
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typedef int (*InitFunc)(CTX_TYPE *);
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typedef int (*UpdateFunc)(CTX_TYPE *sha, const void *data, size_t len);
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typedef int (*FinalFunc)(uint8_t *md, CTX_TYPE *sha);
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const InitFunc init_func_;
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const UpdateFunc update_func_;
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const FinalFunc final_func_;
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public:
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ShaHasherImpl(InitFunc init_func, UpdateFunc update_func,
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FinalFunc final_func, uint32_t digest_size)
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: ShaHasher(digest_size),
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init_func_(init_func),
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update_func_(update_func),
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final_func_(final_func) {}
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~ShaHasherImpl() {}
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bool CalculateDigest(const void *buffer, size_t size, const void *salt,
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uint32_t salt_length, uint8_t *digest) const {
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CTX_TYPE ctx;
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if (init_func_(&ctx) != 1) {
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return false;
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}
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if (update_func_(&ctx, salt, salt_length) != 1) {
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return false;
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}
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if (update_func_(&ctx, buffer, size) != 1) {
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return false;
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}
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if (final_func_(digest, &ctx) != 1) {
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return false;
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}
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return true;
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}
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};
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// Creates a hasher with the parameters corresponding to the algorithm name.
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std::unique_ptr<ShaHasher> CreateShaHasher(const std::string &algorithm);
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// Checks whether the public key is an official GSI key or not.
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bool ValidatePublicKeyBlob(const std::string &key_blob_to_validate);
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uint32_t GetProductFirstApiLevel();
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uint32_t GetBoardApiLevel();
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