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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 <openssl/crypto.h>
#include <openssl/sha.h>
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/pickle.h"
#include "crypto/openssl_util.h"
namespace crypto {
namespace {
const char kSHA256Descriptor[] = "OpenSSL";
class SecureHashSHA256OpenSSL : public SecureHash {
public:
static const int kSecureHashVersion = 1;
SecureHashSHA256OpenSSL() {
SHA256_Init(&ctx_);
}
virtual ~SecureHashSHA256OpenSSL() {
OPENSSL_cleanse(&ctx_, sizeof(ctx_));
}
virtual void Update(const void* input, size_t len) OVERRIDE {
SHA256_Update(&ctx_, static_cast<const unsigned char*>(input), len);
}
virtual 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_);
}
virtual bool Serialize(Pickle* pickle) OVERRIDE;
virtual bool Deserialize(PickleIterator* data_iterator) OVERRIDE;
private:
SHA256_CTX ctx_;
};
bool SecureHashSHA256OpenSSL::Serialize(Pickle* pickle) {
if (!pickle)
return false;
if (!pickle->WriteInt(kSecureHashVersion) ||
!pickle->WriteString(kSHA256Descriptor) ||
!pickle->WriteBytes(&ctx_, sizeof(ctx_))) {
return false;
}
return true;
}
bool SecureHashSHA256OpenSSL::Deserialize(PickleIterator* data_iterator) {
if (!data_iterator)
return false;
int version;
if (!data_iterator->ReadInt(&version))
return false;
if (version > kSecureHashVersion)
return false; // We don't know how to deal with this.
std::string type;
if (!data_iterator->ReadString(&type))
return false;
if (type != kSHA256Descriptor)
return false; // It's the wrong kind.
const char* data = NULL;
if (!data_iterator->ReadBytes(&data, sizeof(ctx_)))
return false;
memcpy(&ctx_, data, sizeof(ctx_));
return true;
}
} // namespace
SecureHash* SecureHash::Create(Algorithm algorithm) {
switch (algorithm) {
case SHA256:
return new SecureHashSHA256OpenSSL();
default:
NOTIMPLEMENTED();
return NULL;
}
}
} // namespace crypto
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