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// Copyright (c) 2013 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 "net/quic/crypto/crypto_utils.h"
#include "base/string_piece.h"
#include "net/base/net_util.h"
#include "net/quic/crypto/crypto_protocol.h"
#include "net/quic/crypto/quic_random.h"
#include "net/quic/quic_clock.h"
using base::StringPiece;
using std::string;
namespace net {
void CryptoUtils::GenerateNonce(const QuicClock* clock,
QuicRandom* random_generator,
string* nonce) {
// a 4-byte timestamp + 28 random bytes.
nonce->reserve(kNonceSize);
nonce->resize(kNonceSize);
QuicTime::Delta now = clock->NowAsDeltaSinceUnixEpoch();
uint32 gmt_unix_time = now.ToSeconds();
const size_t time_size = sizeof(gmt_unix_time);
memcpy(&(*nonce)[0], &gmt_unix_time, time_size);
random_generator->RandBytes(&(*nonce)[time_size], kNonceSize - time_size);
}
void CryptoUtils::FillClientHelloMessage(const QuicClientCryptoConfig& config,
const string& nonce,
const string& server_hostname,
CryptoHandshakeMessage* message) {
message->tag = kCHLO;
StringPiece value;
// Version.
value.set(&config.version, sizeof(config.version));
message->tag_value_map[kVERS] = value.as_string();
// Key exchange methods.
value.set(&config.key_exchange[0],
config.key_exchange.size() * sizeof(config.key_exchange[0]));
message->tag_value_map[kKEXS] = value.as_string();
// Authenticated encryption algorithms.
value.set(&config.aead[0], config.aead.size() * sizeof(config.aead[0]));
message->tag_value_map[kAEAD] = value.as_string();
// Congestion control feedback types.
value.set(&config.congestion_control[0],
config.congestion_control.size() *
sizeof(config.congestion_control[0]));
message->tag_value_map[kCGST] = value.as_string();
// Idle connection state lifetime.
uint32 idle_connection_state_lifetime_secs =
config.idle_connection_state_lifetime.ToSeconds();
value.set(&idle_connection_state_lifetime_secs,
sizeof(idle_connection_state_lifetime_secs));
message->tag_value_map[kICSL] = value.as_string();
// Keepalive timeout.
uint32 keepalive_timeout_secs = config.keepalive_timeout.ToSeconds();
value.set(&keepalive_timeout_secs, sizeof(keepalive_timeout_secs));
message->tag_value_map[kKATO] = value.as_string();
// Connection nonce.
message->tag_value_map[kNONC] = nonce;
// Server name indication.
// If server_hostname is not an IP address literal, it is a DNS hostname.
IPAddressNumber ip_number;
if (!server_hostname.empty() &&
!ParseIPLiteralToNumber(server_hostname, &ip_number)) {
message->tag_value_map[kSNI] = server_hostname;
}
}
} // namespace net
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