mcs/class/Mono.Security/Test/Mono.Security.Cryptography/DiffieHellmanManagedTest.cs

   1 //
   2 // DiffieHellmanManagedTest.cs - NUnit Test Cases for DH (PKCS#3)
   3 //
   4 // Authors:
   5 //      Pieter Philippaerts (Pieter@mentalis.org)
   6 //      Sebastien Pouliot <sebastien@ximian.com>
   7 //
   8 // (C) 2003 The Mentalis.org Team (http://www.mentalis.org/)
   9 // (C) 2004 Novell (http://www.novell.com)
  10 //
  11
  12 using NUnit.Framework;
  13 using System;
  14 using System.IO;
  15 using Mono.Security.Cryptography;
  16 using System.Text;
  17
  18 namespace MonoTests.Mono.Security.Cryptography {
  19
  20         // References:
  21         // a.   PKCS #3: Diffie-Hellman Key-Agreement Standard (version 1.4)
  22         //      ftp://ftp.rsasecurity.com/pub/pkcs/ascii/pkcs-3.asc
  23         // b.   Diffie-Hellman Key Agreement Method
  24         //      http://www.ietf.org/rfc/rfc2631.txt
  25
  26         [TestFixture]
  27         public class DiffieHellmanManagedTest : Assertion {
  28
  29                 // because most crypto stuff works with byte[] buffers
  30                 static public void AssertEquals (string msg, byte[] array1, byte[] array2)
  31                 {
  32                         if ((array1 == null) && (array2 == null))
  33                                 return;
  34                         if (array1 == null)
  35                                 Assertion.Fail (msg + " -> First array is NULL");
  36                         if (array2 == null)
  37                                 Assertion.Fail (msg + " -> Second array is NULL");
  38
  39                         bool a = (array1.Length == array2.Length);
  40                         if (a) {
  41                                 for (int i = 0; i < array1.Length; i++) {
  42                                         if (array1 [i] != array2 [i]) {
  43                                                 a = false;
  44                                                 break;
  45                                         }
  46                                 }
  47                         }
  48                         if (array1.Length > 0) {
  49                                 msg += " -> Expected " + BitConverter.ToString (array1, 0);
  50                                 msg += " is different than " + BitConverter.ToString (array2, 0);
  51                         }
  52                         Assertion.Assert (msg, a);
  53                 }
  54
  55                 [Test]
  56                 public void KeyExchange ()
  57                 {
  58                         // create a new DH instance
  59                         DiffieHellman dh1 = new DiffieHellmanManaged ();
  60                         // export the public parameters of the first DH instance
  61                         DHParameters dhp = dh1.ExportParameters (false);
  62                         // create a second DH instance and initialize it with the public parameters of the first instance
  63                         DiffieHellman dh2 = new DiffieHellmanManaged (dhp.P, dhp.G, 160);
  64                         // generate the public key of the first DH instance
  65                         byte[] ke1 = dh1.CreateKeyExchange ();
  66                         // generate the public key of the second DH instance
  67                         byte[] ke2 = dh2.CreateKeyExchange ();
  68                         // let the first DH instance compute the shared secret using the second DH public key
  69                         byte[] dh1k = dh1.DecryptKeyExchange (ke2);
  70                         // let the second DH instance compute the shared secret using the first DH public key
  71                         byte[] dh2k = dh2.DecryptKeyExchange (ke1);
  72                         // both shared secrets are the same
  73                         AssertEquals ("Shared Secret", dh1k, dh2k);
  74                 }
  75
  76                 // TODO: More is needed !
  77         }
  78 }