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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/protocol/auth_util.h"
- #include "base/base64.h"
- #include "base/logging.h"
- #include "base/strings/string_util.h"
- #include "crypto/hmac.h"
- #include "crypto/sha2.h"
- #include "net/base/net_errors.h"
- #include "net/socket/ssl_socket.h"
- namespace remoting {
- namespace protocol {
- const char kClientAuthSslExporterLabel[] =
- "EXPORTER-remoting-channel-auth-client";
- const char kHostAuthSslExporterLabel[] =
- "EXPORTER-remoting-channel-auth-host";
- const char kSslFakeHostName[] = "chromoting";
- std::string GetSharedSecretHash(const std::string& tag,
- const std::string& shared_secret) {
- crypto::HMAC response(crypto::HMAC::SHA256);
- if (!response.Init(tag)) {
- LOG(FATAL) << "HMAC::Init failed";
- }
- unsigned char out_bytes[kSharedSecretHashLength];
- if (!response.Sign(shared_secret, out_bytes, sizeof(out_bytes))) {
- LOG(FATAL) << "HMAC::Sign failed";
- }
- return std::string(out_bytes, out_bytes + sizeof(out_bytes));
- }
- // static
- std::string GetAuthBytes(net::SSLSocket* socket,
- const base::StringPiece& label,
- const base::StringPiece& shared_secret) {
- // Get keying material from SSL.
- unsigned char key_material[kAuthDigestLength];
- int export_result = socket->ExportKeyingMaterial(
- label, false, "", key_material, kAuthDigestLength);
- if (export_result != net::OK) {
- LOG(ERROR) << "Error fetching keying material: " << export_result;
- return std::string();
- }
- // Generate auth digest based on the keying material and shared secret.
- crypto::HMAC response(crypto::HMAC::SHA256);
- if (!response.Init(key_material, kAuthDigestLength)) {
- NOTREACHED() << "HMAC::Init failed";
- return std::string();
- }
- unsigned char out_bytes[kAuthDigestLength];
- if (!response.Sign(shared_secret, out_bytes, kAuthDigestLength)) {
- NOTREACHED() << "HMAC::Sign failed";
- return std::string();
- }
- return std::string(out_bytes, out_bytes + kAuthDigestLength);
- }
- } // namespace protocol
- } // namespace remoting
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