1 // Transport Security Layer (TLS)
2 // Copyright (c) 2003-2004 Carlos Guzman Alvarez
3 // Copyright (C) 2006 Novell, Inc (http://www.novell.com)
5 // Permission is hereby granted, free of charge, to any person obtaining
6 // a copy of this software and associated documentation files (the
7 // "Software"), to deal in the Software without restriction, including
8 // without limitation the rights to use, copy, modify, merge, publish,
9 // distribute, sublicense, and/or sell copies of the Software, and to
10 // permit persons to whom the Software is furnished to do so, subject to
11 // the following conditions:
13 // The above copyright notice and this permission notice shall be
14 // included in all copies or substantial portions of the Software.
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 using System.Security.Cryptography;
28 using Mono.Security.Cryptography;
30 namespace Mono.Security.Protocol.Tls.Handshake.Client
32 internal class TlsClientKeyExchange : HandshakeMessage
36 public TlsClientKeyExchange (Context context) :
37 base(context, HandshakeType.ClientKeyExchange)
43 #region Protected Methods
45 protected override void ProcessAsSsl3()
47 // a large chunk of code is common to both SSL3 and TLS1
48 // SSL3 doesn't send the length of the buffer
49 ProcessCommon (false);
52 protected override void ProcessAsTls1()
54 // a large chunk of code is common to both SSL3 and TLS1
55 // TLS1 does send the length of the buffer
59 public void ProcessCommon (bool sendLength)
61 // Compute pre master secret
62 byte[] preMasterSecret = this.Context.Negotiating.Cipher.CreatePremasterSecret ();
64 // Create a new RSA key
66 if (this.Context.ServerSettings.ServerKeyExchange)
68 // this is the case for "exportable" ciphers
69 rsa = new RSAManaged ();
70 rsa.ImportParameters (this.Context.ServerSettings.RsaParameters);
74 rsa = this.Context.ServerSettings.CertificateRSA;
77 // Encrypt premaster_sercret
78 RSAPKCS1KeyExchangeFormatter formatter = new RSAPKCS1KeyExchangeFormatter (rsa);
80 // Write the preMasterSecret encrypted
81 byte[] buffer = formatter.CreateKeyExchange (preMasterSecret);
83 this.Write ((short) buffer.Length);
86 // Create master secret
87 this.Context.Negotiating.Cipher.ComputeMasterSecret (preMasterSecret);
90 this.Context.Negotiating.Cipher.ComputeKeys ();