Send the ClientHello handshake message. Fix a bug in

net/quic/crypto/crypto_utils.cc

+// 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/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,
+                                         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.
+  // TODO(wtc): if server_hostname_ is a DNS name, store it in
+  // message->tag_value_map[kSNI].
+}
+
+}  // namespace net