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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 TlsClientKeyExchange : HandshakeMessage
{
#region Constructors
public TlsClientKeyExchange (Context context) :
base(context, HandshakeType.ClientKeyExchange)
{
}
#endregion
#region Protected Methods
protected override void ProcessAsSsl3()
{
// a large chunk of code is common to both SSL3 and TLS1
// SSL3 doesn't send the length of the buffer
ProcessCommon (false);
}
protected override void ProcessAsTls1()
{
// a large chunk of code is common to both SSL3 and TLS1
// TLS1 does send the length of the buffer
ProcessCommon (true);
}
public void ProcessCommon (bool sendLength)
{
// Compute pre master secret
byte[] preMasterSecret = this.Context.Negotiating.Cipher.CreatePremasterSecret ();
// Create a new RSA key
RSA rsa = null;
if (this.Context.ServerSettings.ServerKeyExchange)
{
// this is the case for "exportable" ciphers
rsa = new RSAManaged ();
rsa.ImportParameters (this.Context.ServerSettings.RsaParameters);
}
else
{
rsa = this.Context.ServerSettings.CertificateRSA;
}
// Encrypt premaster_sercret
RSAPKCS1KeyExchangeFormatter formatter = new RSAPKCS1KeyExchangeFormatter (rsa);
// Write the preMasterSecret encrypted
byte[] buffer = formatter.CreateKeyExchange (preMasterSecret);
if (sendLength)
this.Write ((short) buffer.Length);
this.Write (buffer);
// Create master secret
this.Context.Negotiating.Cipher.ComputeMasterSecret (preMasterSecret);
// Create keys
this.Context.Negotiating.Cipher.ComputeKeys ();
// Clear resources
rsa.Clear ();
}
#endregion
}
}
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