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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/secure_hash.h"
#include <stddef.h>
#include "base/memory/ptr_util.h"
#include "base/notreached.h"
#include "base/pickle.h"
#include "crypto/openssl_util.h"
#include "third_party/boringssl/src/include/openssl/mem.h"
#include "third_party/boringssl/src/include/openssl/sha.h"
namespace crypto {
namespace {
class SecureHashSHA256 : public SecureHash {
public:
SecureHashSHA256() {
// Ensure that CPU features detection is performed before using
// BoringSSL. This will enable hw accelerated implementations.
EnsureOpenSSLInit();
SHA256_Init(&ctx_);
}
SecureHashSHA256(const SecureHashSHA256& other) {
memcpy(&ctx_, &other.ctx_, sizeof(ctx_));
}
~SecureHashSHA256() override {
OPENSSL_cleanse(&ctx_, sizeof(ctx_));
}
void Update(const void* input, size_t len) override {
SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len);
}
void Finish(void* output, size_t len) override {
ScopedOpenSSLSafeSizeBuffer<SHA256_DIGEST_LENGTH> result(
static_cast<unsigned char*>(output), len);
SHA256_Final(result.safe_buffer(), &ctx_);
}
std::unique_ptr<SecureHash> Clone() const override {
return std::make_unique<SecureHashSHA256>(*this);
}
size_t GetHashLength() const override { return SHA256_DIGEST_LENGTH; }
private:
SHA256_CTX ctx_;
};
} // namespace
std::unique_ptr<SecureHash> SecureHash::Create(Algorithm algorithm) {
switch (algorithm) {
case SHA256:
return std::make_unique<SecureHashSHA256>();
default:
NOTIMPLEMENTED();
return nullptr;
}
}
} // namespace crypto
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