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//
// Mono.Security.Protocol.Ntlm.MessageBase
// abstract class for all NTLM messages
//
// Author:
// Sebastien Pouliot (spouliot@motus.com)
//
// Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
//
// References
// a. NTLM Authentication Scheme for HTTP, Ronald Tschalär
// http://www.innovation.ch/java/ntlm.html
// b. The NTLM Authentication Protocol, Copyright © 2003 Eric Glass
// http://davenport.sourceforge.net/ntlm.html
//
using System;
namespace Mono.Security.Protocol.Ntlm {
public abstract class MessageBase {
static private byte[] header = { 0x4e, 0x54, 0x4c, 0x4d, 0x53, 0x53, 0x50, 0x00 };
private int _type;
private NtlmFlags _flags;
protected MessageBase (int messageType)
{
_type = messageType;
}
public NtlmFlags Flags {
get { return _flags; }
set { _flags = value; }
}
public int Type {
get { return _type; }
}
protected byte[] PrepareMessage (int messageSize)
{
byte[] message = new byte [messageSize];
Buffer.BlockCopy (header, 0, message, 0, 8);
message [ 8] = (byte) _type;
message [ 9] = (byte)(_type >> 8);
message [10] = (byte)(_type >> 16);
message [11] = (byte)(_type >> 24);
return message;
}
protected virtual void Decode (byte[] message)
{
if (message == null)
throw new ArgumentNullException ("message");
if (message.Length < 12)
throw new ArgumentOutOfRangeException ("message", message.Length, "minimum is 12 bytes");
if (!CheckHeader (message))
throw new ArgumentException ("Invalid Type" + _type + " message");
}
protected bool CheckHeader (byte[] message)
{
for (int i=0; i < header.Length; i++) {
if (message [i] != header [i])
return false;
}
return (BitConverter.ToUInt32 (message, 8) == _type);
}
public abstract byte[] GetBytes ();
}
}
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