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/* Transport Security Layer (TLS)
* Copyright (c) 2003 Carlos Guzmán Álvarez
*
* 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 : TlsHandshakeMessage
{
#region CONSTRUCTORS
public TlsServerFinished(TlsSession session, byte[] buffer)
: base(session, TlsHandshakeType.ServerHello, buffer)
{
}
#endregion
#region METHODS
public override void UpdateSession()
{
base.UpdateSession();
// Reset Hahdshake messages information
this.Session.Context.HandshakeMessages.Reset();
// Hahdshake is finished
this.Session.Context.HandshakeFinished = true;
}
#endregion
#region PROTECTED_METHODS
protected override void ProcessAsSsl3()
{
// Compute handshake messages hashes
HashAlgorithm hash = new TlsSslHandshakeHash(this.Session.Context.MasterSecret);
TlsStream data = new TlsStream();
data.Write(this.Session.Context.HandshakeMessages.ToArray());
data.Write((int)0x53525652);
hash.TransformFinalBlock(data.ToArray(), 0, (int)data.Length);
data.Reset();
byte[] serverHash = this.ReadBytes((int)Length);
byte[] clientHash = hash.Hash;
// Check server prf against client prf
if (clientHash.Length != serverHash.Length)
{
throw new TlsException("Invalid ServerFinished message received.");
}
for (int i = 0; i < serverHash.Length; i++)
{
if (clientHash[i] != serverHash[i])
{
throw new TlsException("Invalid ServerFinished message received.");
}
}
}
protected override void ProcessAsTls1()
{
byte[] serverPRF = this.ReadBytes((int)Length);
HashAlgorithm hash = new MD5SHA1CryptoServiceProvider();
hash.ComputeHash(
Session.Context.HandshakeMessages.ToArray(),
0,
(int)Session.Context.HandshakeMessages.Length);
byte[] clientPRF = this.Session.Context.Cipher.PRF(this.Session.Context.MasterSecret, "server finished", hash.Hash, 12);
// Check server prf against client prf
if (clientPRF.Length != serverPRF.Length)
{
throw new TlsException("Invalid ServerFinished message received.");
}
for (int i = 0; i < serverPRF.Length; i++)
{
if (clientPRF[i] != serverPRF[i])
{
throw new TlsException("Invalid ServerFinished message received.");
}
}
}
#endregion
}
}
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