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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 Mono.Security.Cryptography;
using Mono.Security.X509;
namespace Mono.Security.Protocol.Tls.Handshake.Client
{
internal class TlsServerKeyExchange : HandshakeMessage
{
#region Fields
private RSAParameters rsaParams;
private byte[] signedParams;
#endregion
#region Constructors
public TlsServerKeyExchange(Context context, byte[] buffer)
: base(context, HandshakeType.ServerKeyExchange, buffer)
{
this.verifySignature();
}
#endregion
#region Methods
public override void Update()
{
base.Update();
this.Context.ServerSettings.ServerKeyExchange = true;
this.Context.ServerSettings.RsaParameters = this.rsaParams;
this.Context.ServerSettings.SignedParams = this.signedParams;
}
#endregion
#region Protected Methods
protected override void ProcessAsSsl3()
{
this.ProcessAsTls1();
}
protected override void ProcessAsTls1()
{
this.rsaParams = new RSAParameters();
// Read modulus
this.rsaParams.Modulus = this.ReadBytes(this.ReadInt16());
// Read exponent
this.rsaParams.Exponent = this.ReadBytes(this.ReadInt16());
// Read signed params
this.signedParams = this.ReadBytes(this.ReadInt16());
}
#endregion
#region Private Methods
private void verifySignature()
{
MD5SHA1 hash = new MD5SHA1();
// Calculate size of server params
int size = rsaParams.Modulus.Length + rsaParams.Exponent.Length + 4;
// Create server params array
TlsStream stream = new TlsStream();
stream.Write(this.Context.RandomCS);
stream.Write(this.ToArray(), 0, size);
hash.ComputeHash(stream.ToArray());
stream.Reset();
bool isValidSignature = hash.VerifySignature(
this.Context.ServerSettings.CertificateRSA,
this.signedParams);
if (!isValidSignature)
{
throw new TlsException(
AlertDescription.DecodeError,
"Data was not signed with the server certificate.");
}
}
#endregion
}
}
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