111 lines
3.0 KiB
C#
111 lines
3.0 KiB
C#
// Transport Security Layer (TLS)
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// Copyright (c) 2003-2004 Carlos Guzman Alvarez
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Security.Cryptography;
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using SX509 = System.Security.Cryptography.X509Certificates;
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using Mono.Security.Cryptography;
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using Mono.Security.X509;
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namespace Mono.Security.Protocol.Tls.Handshake.Server
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{
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internal class TlsServerKeyExchange : HandshakeMessage
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{
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#region Constructors
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public TlsServerKeyExchange(Context context)
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: base(context, HandshakeType.ServerKeyExchange)
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{
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}
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#endregion
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#region Methods
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public override void Update()
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{
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throw new NotSupportedException();
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}
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#endregion
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#region Protected Methods
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protected override void ProcessAsSsl3()
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{
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this.ProcessAsTls1();
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}
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protected override void ProcessAsTls1()
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{
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ServerContext context = (ServerContext)this.Context;
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// Select the private key information
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RSA rsa = (RSA)context.SslStream.PrivateKeyCertSelectionDelegate(
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new SX509.X509Certificate(context.ServerSettings.Certificates[0].RawData),
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null);
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RSAParameters rsaParams = rsa.ExportParameters(false);
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// Write Modulus
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this.WriteInt24(rsaParams.Modulus.Length);
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this.Write(rsaParams.Modulus, 0, rsaParams.Modulus.Length);
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// Write exponent
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this.WriteInt24(rsaParams.Exponent.Length);
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this.Write(rsaParams.Exponent, 0, rsaParams.Exponent.Length);
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// Write signed params
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byte[] signature = this.createSignature(rsa, this.ToArray());
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this.WriteInt24(signature.Length);
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this.Write(signature);
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}
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#endregion
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#region Private Methods
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private byte[] createSignature(RSA rsa, byte[] buffer)
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{
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MD5SHA1 hash = new MD5SHA1();
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// Create server params array
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TlsStream stream = new TlsStream();
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stream.Write(this.Context.RandomCS);
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stream.Write(buffer, 0, buffer.Length);
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hash.ComputeHash(stream.ToArray());
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stream.Reset();
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return hash.CreateSignature(rsa);
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}
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#endregion
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}
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}
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