99 lines
2.9 KiB
C#
99 lines
2.9 KiB
C#
// Transport Security Layer (TLS)
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// Copyright (c) 2003-2004 Carlos Guzman Alvarez
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// Copyright (C) 2006 Novell, Inc (http://www.novell.com)
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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 Mono.Security.Cryptography;
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namespace Mono.Security.Protocol.Tls.Handshake.Client
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{
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internal class TlsClientKeyExchange : HandshakeMessage
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{
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#region Constructors
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public TlsClientKeyExchange (Context context) :
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base(context, HandshakeType.ClientKeyExchange)
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{
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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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// a large chunk of code is common to both SSL3 and TLS1
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// SSL3 doesn't send the length of the buffer
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ProcessCommon (false);
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}
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protected override void ProcessAsTls1()
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{
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// a large chunk of code is common to both SSL3 and TLS1
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// TLS1 does send the length of the buffer
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ProcessCommon (true);
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}
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public void ProcessCommon (bool sendLength)
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{
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// Compute pre master secret
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byte[] preMasterSecret = this.Context.Negotiating.Cipher.CreatePremasterSecret ();
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// Create a new RSA key
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RSA rsa = null;
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if (this.Context.ServerSettings.ServerKeyExchange)
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{
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// this is the case for "exportable" ciphers
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rsa = new RSAManaged ();
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rsa.ImportParameters (this.Context.ServerSettings.RsaParameters);
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}
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else
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{
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rsa = this.Context.ServerSettings.CertificateRSA;
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}
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// Encrypt premaster_sercret
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RSAPKCS1KeyExchangeFormatter formatter = new RSAPKCS1KeyExchangeFormatter (rsa);
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// Write the preMasterSecret encrypted
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byte[] buffer = formatter.CreateKeyExchange (preMasterSecret);
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if (sendLength)
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this.Write ((short) buffer.Length);
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this.Write (buffer);
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// Create master secret
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this.Context.Negotiating.Cipher.ComputeMasterSecret (preMasterSecret);
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// Create keys
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this.Context.Negotiating.Cipher.ComputeKeys ();
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// Clear resources
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rsa.Clear ();
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}
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#endregion
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}
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}
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