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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 "base/logging.h"
#include "base/pickle.h"
#include "crypto/third_party/nss/chromium-blapi.h"
#include "crypto/third_party/nss/chromium-sha256.h"
namespace crypto {
namespace {
const char kSHA256Descriptor[] = "NSS";
class SecureHashSHA256NSS : public SecureHash {
public:
static const int kSecureHashVersion = 1;
SecureHashSHA256NSS() {
SHA256_Begin(&ctx_);
}
~SecureHashSHA256NSS() override { memset(&ctx_, 0, sizeof(ctx_)); }
// SecureHash implementation:
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 {
SHA256_End(&ctx_, static_cast<unsigned char*>(output), NULL,
static_cast<unsigned int>(len));
}
bool Serialize(Pickle* pickle) override;
bool Deserialize(PickleIterator* data_iterator) override;
private:
SHA256Context ctx_;
};
bool SecureHashSHA256NSS::Serialize(Pickle* pickle) {
if (!pickle)
return false;
if (!pickle->WriteInt(kSecureHashVersion) ||
!pickle->WriteString(kSHA256Descriptor) ||
!pickle->WriteBytes(&ctx_, sizeof(ctx_))) {
return false;
}
return true;
}
bool SecureHashSHA256NSS::Deserialize(PickleIterator* data_iterator) {
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 SecureHashSHA256NSS();
default:
NOTIMPLEMENTED();
return NULL;
}
}
} // namespace crypto
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