Add a buffer reader/writer for NTLM.

net/http/ntlm_message.cc

+// Copyright (c) 2017 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/http/ntlm_message.h"
+#include "base/macros.h"
+
+namespace net {
+
+const uint8_t NtlmMessage::SIGNATURE[] = "NTLMSSP";
+const size_t NtlmMessage::SIGNATURE_LEN = arraysize(SIGNATURE);
+const size_t NtlmMessage::SECURITY_BUFFER_LEN =
+    (2 * sizeof(uint16_t)) + sizeof(uint32_t);
+const size_t NtlmMessage::NEGOTIATE_MESSAGE_LEN = 32;
+const size_t NtlmMessage::RESPONSE_V1_LEN = 24;
+const size_t NtlmMessage::CHALLENGE_LEN = 8;
+const size_t NtlmMessage::NTLM_HASH_LEN = 16;
+
+const uint32_t NtlmMessage::NEGOTIATE_MESSAGE_FLAGS =
+    NTLMSSP_NEGOTIATE_UNICODE | NTLMSSP_NEGOTIATE_OEM | NTLMSSP_REQUEST_TARGET |
+    NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
+    NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY;
+
+}  // namespace net