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// Transport Security Layer (TLS)
// Copyright (c) 2003-2004 Carlos Guzman Alvarez
// Copyright (C) 2006 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
namespace Mono.Security.Protocol.Tls.Handshake
{
internal abstract class HandshakeMessage : TlsStream
{
#region Fields
private Context context;
private HandshakeType handshakeType;
private ContentType contentType;
private byte[] cache;
#endregion
#region Properties
public Context Context
{
get { return this.context; }
}
public HandshakeType HandshakeType
{
get { return this.handshakeType; }
}
public ContentType ContentType
{
get { return this.contentType; }
}
#endregion
#region Constructors
public HandshakeMessage(
Context context,
HandshakeType handshakeType)
: this(context, handshakeType, ContentType.Handshake)
{
}
public HandshakeMessage(
Context context,
HandshakeType handshakeType,
ContentType contentType) : base()
{
this.context = context;
this.handshakeType = handshakeType;
this.contentType = contentType;
}
public HandshakeMessage(
Context context,
HandshakeType handshakeType,
byte[] data) : base(data)
{
this.context = context;
this.handshakeType = handshakeType;
}
#endregion
#region Abstract Methods
protected abstract void ProcessAsTls1();
protected abstract void ProcessAsSsl3();
#endregion
#region Methods
public void Process()
{
switch (this.Context.SecurityProtocol)
{
case SecurityProtocolType.Tls:
case SecurityProtocolType.Default:
this.ProcessAsTls1();
break;
case SecurityProtocolType.Ssl3:
this.ProcessAsSsl3();
break;
case SecurityProtocolType.Ssl2:
default:
throw new NotSupportedException("Unsupported security protocol type");
}
}
public virtual void Update()
{
if (this.CanWrite)
{
// result may (should) be available from a previous call to EncodeMessage
if (cache == null)
cache = this.EncodeMessage ();
this.context.HandshakeMessages.Write (cache);
this.Reset();
cache = null;
}
}
public virtual byte[] EncodeMessage()
{
cache = null;
if (CanWrite)
{
byte[] hs = this.ToArray ();
int len = hs.Length;
cache = new byte[4 + len];
cache[0] = (byte) HandshakeType;
// Length as an Int24 in Network Order
cache[1] = (byte) (len >> 16);
cache[2] = (byte) (len >> 8);
cache[3] = (byte) len;
Buffer.BlockCopy (hs, 0, cache, 4, len);
}
return cache;
}
static public bool Compare (byte[] buffer1, byte[] buffer2)
{
// in our case both null can't exist (or be valid)
if ((buffer1 == null) || (buffer2 == null))
return false;
if (buffer1.Length != buffer2.Length)
return false;
for (int i = 0; i < buffer1.Length; i++) {
if (buffer1[i] != buffer2[i])
return false;
}
return true;
}
#endregion
}
}
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