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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.IO;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
namespace Mono.Security.Protocol.Tls.Handshake.Server
{
internal class TlsClientKeyExchange : HandshakeMessage
{
#region Constructors
public TlsClientKeyExchange(Context context, byte[] buffer) :
base(context,
HandshakeType.ClientKeyExchange,
buffer)
{
}
#endregion
#region Protected Methods
protected override void ProcessAsSsl3()
{
AsymmetricAlgorithm privKey = null;
ServerContext context = (ServerContext)this.Context;
// Select the private key information
privKey = context.SslStream.RaisePrivateKeySelection(
new X509Certificate(context.ServerSettings.Certificates[0].RawData),
null);
if (privKey == null)
{
throw new TlsException(AlertDescription.UserCancelled, "Server certificate Private Key unavailable.");
}
// Read client premaster secret
byte[] clientSecret = this.ReadBytes((int)this.Length);
// Decrypt premaster secret
RSAPKCS1KeyExchangeDeformatter deformatter = new RSAPKCS1KeyExchangeDeformatter(privKey);
byte[] preMasterSecret = deformatter.DecryptKeyExchange(clientSecret);
// Create master secret
this.Context.Negotiating.Cipher.ComputeMasterSecret(preMasterSecret);
// Create keys
this.Context.Negotiating.Cipher.ComputeKeys ();
// Initialize Cipher Suite
this.Context.Negotiating.Cipher.InitializeCipher ();
}
protected override void ProcessAsTls1()
{
AsymmetricAlgorithm privKey = null;
ServerContext context = (ServerContext)this.Context;
// Select the private key information
// Select the private key information
privKey = context.SslStream.RaisePrivateKeySelection(
new X509Certificate(context.ServerSettings.Certificates[0].RawData),
null);
if (privKey == null)
{
throw new TlsException(AlertDescription.UserCancelled, "Server certificate Private Key unavailable.");
}
// Read client premaster secret
byte[] clientSecret = this.ReadBytes(this.ReadInt16());
// Decrypt premaster secret
RSAPKCS1KeyExchangeDeformatter deformatter = new RSAPKCS1KeyExchangeDeformatter(privKey);
byte[] preMasterSecret = deformatter.DecryptKeyExchange(clientSecret);
// Create master secret
this.Context.Negotiating.Cipher.ComputeMasterSecret(preMasterSecret);
// Create keys
this.Context.Negotiating.Cipher.ComputeKeys();
// Initialize Cipher Suite
this.Context.Negotiating.Cipher.InitializeCipher();
}
#endregion
}
}
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