102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "crypto/secure_hash.h"
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#include <openssl/mem.h>
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#include <openssl/sha.h>
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#include <stddef.h>
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#include "base/logging.h"
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#include "base/pickle.h"
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#include "crypto/openssl_util.h"
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namespace crypto {
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namespace {
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const char kSHA256Descriptor[] = "OpenSSL";
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class SecureHashSHA256OpenSSL : public SecureHash {
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public:
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static const int kSecureHashVersion = 1;
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SecureHashSHA256OpenSSL() {
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SHA256_Init(&ctx_);
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}
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~SecureHashSHA256OpenSSL() override {
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OPENSSL_cleanse(&ctx_, sizeof(ctx_));
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}
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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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bool Serialize(base::Pickle* pickle) override;
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bool Deserialize(base::PickleIterator* data_iterator) override;
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private:
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SHA256_CTX ctx_;
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};
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bool SecureHashSHA256OpenSSL::Serialize(base::Pickle* pickle) {
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if (!pickle)
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return false;
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if (!pickle->WriteInt(kSecureHashVersion) ||
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!pickle->WriteString(kSHA256Descriptor) ||
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!pickle->WriteBytes(&ctx_, sizeof(ctx_))) {
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return false;
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}
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return true;
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}
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bool SecureHashSHA256OpenSSL::Deserialize(base::PickleIterator* data_iterator) {
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if (!data_iterator)
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return false;
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int version;
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if (!data_iterator->ReadInt(&version))
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return false;
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if (version > kSecureHashVersion)
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return false; // We don't know how to deal with this.
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std::string type;
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if (!data_iterator->ReadString(&type))
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return false;
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if (type != kSHA256Descriptor)
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return false; // It's the wrong kind.
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const char* data = NULL;
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if (!data_iterator->ReadBytes(&data, sizeof(ctx_)))
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return false;
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memcpy(&ctx_, data, sizeof(ctx_));
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return true;
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}
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} // namespace
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SecureHash* SecureHash::Create(Algorithm algorithm) {
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switch (algorithm) {
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case SHA256:
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return new SecureHashSHA256OpenSSL();
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default:
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NOTIMPLEMENTED();
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return NULL;
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}
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}
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} // namespace crypto
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