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hai007
05ae5583f8
them with chromium ::crypto symbols of the same names. PiperOrigin-RevId: 684566882
77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
// Copyright 2020 Google LLC
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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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// https://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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#include "internal/crypto_cros/secure_hash.h"
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#include <stddef.h>
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#include <memory>
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#include "internal/crypto_cros/openssl_util.h"
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#include <openssl/mem.h>
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#include <openssl/sha.h>
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namespace nearby::crypto {
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namespace {
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class SecureHashSHA256 : public SecureHash {
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public:
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SecureHashSHA256() {
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// Ensure that CPU features detection is performed before using
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// BoringSSL. This will enable hw accelerated implementations.
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EnsureOpenSSLInit();
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SHA256_Init(&ctx_);
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}
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SecureHashSHA256(const SecureHashSHA256& other) {
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memcpy(&ctx_, &other.ctx_, sizeof(ctx_));
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}
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~SecureHashSHA256() override { OPENSSL_cleanse(&ctx_, sizeof(ctx_)); }
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void Update(const void* input, size_t len) override {
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SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len);
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}
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void Finish(void* output, size_t len) override {
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ScopedOpenSSLSafeSizeBuffer<SHA256_DIGEST_LENGTH> result(
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static_cast<unsigned char*>(output), len);
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SHA256_Final(result.safe_buffer(), &ctx_);
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}
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std::unique_ptr<SecureHash> Clone() const override {
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return std::make_unique<SecureHashSHA256>(*this);
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}
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size_t GetHashLength() const override { return SHA256_DIGEST_LENGTH; }
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private:
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SHA256_CTX ctx_;
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};
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} // namespace
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std::unique_ptr<SecureHash> SecureHash::Create(Algorithm algorithm) {
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switch (algorithm) {
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case SHA256:
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return std::make_unique<SecureHashSHA256>();
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default:
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// NOTIMPLEMENTED();
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return nullptr;
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}
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}
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} // namespace nearby::crypto
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