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// Transport Security Layer (TLS)
// Copyright (c) 2003-2004 Carlos Guzman Alvarez
//
// 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 SX509 = System.Security.Cryptography.X509Certificates;
using Mono.Security.Cryptography;
using Mono.Security.X509;
namespace Mono.Security.Protocol.Tls.Handshake.Server
{
internal class TlsServerKeyExchange : HandshakeMessage
{
#region Constructors
public TlsServerKeyExchange(Context context)
: base(context, HandshakeType.ServerKeyExchange)
{
}
#endregion
#region Methods
public override void Update()
{
throw new NotSupportedException();
}
#endregion
#region Protected Methods
protected override void ProcessAsSsl3()
{
this.ProcessAsTls1();
}
protected override void ProcessAsTls1()
{
ServerContext context = (ServerContext)this.Context;
// Select the private key information
RSA rsa = (RSA)context.SslStream.PrivateKeyCertSelectionDelegate(
new SX509.X509Certificate(context.ServerSettings.Certificates[0].RawData),
null);
RSAParameters rsaParams = rsa.ExportParameters(false);
// Write Modulus
this.WriteInt24(rsaParams.Modulus.Length);
this.Write(rsaParams.Modulus, 0, rsaParams.Modulus.Length);
// Write exponent
this.WriteInt24(rsaParams.Exponent.Length);
this.Write(rsaParams.Exponent, 0, rsaParams.Exponent.Length);
// Write signed params
byte[] signature = this.createSignature(rsa, this.ToArray());
this.WriteInt24(signature.Length);
this.Write(signature);
}
#endregion
#region Private Methods
private byte[] createSignature(RSA rsa, byte[] buffer)
{
MD5SHA1 hash = new MD5SHA1();
// Create server params array
TlsStream stream = new TlsStream();
stream.Write(this.Context.RandomCS);
stream.Write(buffer, 0, buffer.Length);
hash.ComputeHash(stream.ToArray());
stream.Reset();
return hash.CreateSignature(rsa);
}
#endregion
}
}
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