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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;
using System.Security.Cryptography;
using Mono.Security.Cryptography;
namespace Mono.Security.Protocol.Tls.Handshake.Client
{
internal class TlsServerFinished : HandshakeMessage
{
#region Constructors
public TlsServerFinished(Context context, byte[] buffer)
: base(context, HandshakeType.Finished, buffer)
{
}
#endregion
#region Methods
public override void Update()
{
base.Update();
// Hahdshake is finished
this.Context.HandshakeState = HandshakeState.Finished;
}
#endregion
#region Protected Methods
static private byte[] Ssl3Marker = new byte [4] { 0x53, 0x52, 0x56, 0x52 };
protected override void ProcessAsSsl3()
{
// Compute handshake messages hashes
HashAlgorithm hash = new SslHandshakeHash(this.Context.MasterSecret);
byte[] data = this.Context.HandshakeMessages.ToArray ();
hash.TransformBlock (data, 0, data.Length, data, 0);
hash.TransformBlock (Ssl3Marker, 0, Ssl3Marker.Length, Ssl3Marker, 0);
// hack to avoid memory allocation
hash.TransformFinalBlock (CipherSuite.EmptyArray, 0, 0);
byte[] serverHash = this.ReadBytes((int)Length);
byte[] clientHash = hash.Hash;
// Check server prf against client prf
if (!Compare (clientHash, serverHash))
{
#warning Review that selected alert is correct
throw new TlsException(AlertDescription.InsuficientSecurity, "Invalid ServerFinished message received.");
}
}
protected override void ProcessAsTls1()
{
byte[] serverPRF = this.ReadBytes((int)Length);
HashAlgorithm hash = new MD5SHA1();
// note: we could call HashAlgorithm.ComputeHash(Stream) but that would allocate (on Mono)
// a 4096 bytes buffer to process the hash - which is bigger than HandshakeMessages
byte[] data = this.Context.HandshakeMessages.ToArray ();
byte[] digest = hash.ComputeHash (data, 0, data.Length);
byte[] clientPRF = this.Context.Current.Cipher.PRF(this.Context.MasterSecret, "server finished", digest, 12);
// Check server prf against client prf
if (!Compare (clientPRF, serverPRF))
{
throw new TlsException("Invalid ServerFinished message received.");
}
}
#endregion
}
}
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