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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 "remoting/base/rsa_key_pair.h"
#include <stdint.h>
#include <limits>
#include <string>
#include <utility>
#include <vector>
#include "base/base64.h"
#include "base/logging.h"
#include "base/rand_util.h"
#include "base/time/time.h"
#include "crypto/rsa_private_key.h"
#include "crypto/signature_creator.h"
#include "net/cert/x509_util.h"
namespace remoting {
RsaKeyPair::RsaKeyPair(scoped_ptr<crypto::RSAPrivateKey> key)
: key_(std::move(key)){
DCHECK(key_);
}
RsaKeyPair::~RsaKeyPair() {}
// static
scoped_refptr<RsaKeyPair> RsaKeyPair::Generate() {
scoped_ptr<crypto::RSAPrivateKey> key(crypto::RSAPrivateKey::Create(2048));
if (!key) {
LOG(ERROR) << "Cannot generate private key.";
return NULL;
}
return new RsaKeyPair(std::move(key));
}
// static
scoped_refptr<RsaKeyPair> RsaKeyPair::FromString(
const std::string& key_base64) {
std::string key_str;
if (!base::Base64Decode(key_base64, &key_str)) {
LOG(ERROR) << "Failed to decode private key.";
return NULL;
}
std::vector<uint8_t> key_buf(key_str.begin(), key_str.end());
scoped_ptr<crypto::RSAPrivateKey> key(
crypto::RSAPrivateKey::CreateFromPrivateKeyInfo(key_buf));
if (!key) {
LOG(ERROR) << "Invalid private key.";
return NULL;
}
return new RsaKeyPair(std::move(key));
}
std::string RsaKeyPair::ToString() const {
// Check that the key initialized.
DCHECK(key_.get() != NULL);
std::vector<uint8_t> key_buf;
CHECK(key_->ExportPrivateKey(&key_buf));
std::string key_str(key_buf.begin(), key_buf.end());
std::string key_base64;
base::Base64Encode(key_str, &key_base64);
return key_base64;
}
std::string RsaKeyPair::GetPublicKey() const {
std::vector<uint8_t> public_key;
CHECK(key_->ExportPublicKey(&public_key));
std::string public_key_str(public_key.begin(), public_key.end());
std::string public_key_base64;
base::Base64Encode(public_key_str, &public_key_base64);
return public_key_base64;
}
std::string RsaKeyPair::SignMessage(const std::string& message) const {
scoped_ptr<crypto::SignatureCreator> signature_creator(
crypto::SignatureCreator::Create(key_.get(),
crypto::SignatureCreator::SHA1));
signature_creator->Update(reinterpret_cast<const uint8_t*>(message.c_str()),
message.length());
std::vector<uint8_t> signature_buf;
signature_creator->Final(&signature_buf);
std::string signature_str(signature_buf.begin(), signature_buf.end());
std::string signature_base64;
base::Base64Encode(signature_str, &signature_base64);
return signature_base64;
}
std::string RsaKeyPair::GenerateCertificate() const {
std::string der_cert;
// Certificates are SHA1-signed because |key_| has likely been used to sign
// with SHA1 previously, and you should not re-use a key for signing data with
// multiple signature algorithms.
net::x509_util::CreateSelfSignedCert(
key_.get(),
net::x509_util::DIGEST_SHA1,
"CN=chromoting",
base::RandInt(1, std::numeric_limits<int>::max()),
base::Time::Now(),
base::Time::Now() + base::TimeDelta::FromDays(1),
&der_cert);
return der_cert;
}
} // namespace remoting
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