mcs/class/corlib/System.Security.Cryptography/RSAPKCS1KeyExchangeFormatter.cs

   1 //
   2 // RSAPKCS1KeyExchangeFormatter.cs: Handles PKCS#1 v.1.5 keyex encryption.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //
   7 // (C) 2002 Motus Technologies Inc. (http://www.motus.com)
   8 // (C) 2004 Novell (http://www.novell.com)
   9 //
  10
  11 using System;
  12 using System.Globalization;
  13 using Mono.Security.Cryptography;
  14
  15 namespace System.Security.Cryptography {
  16
  17         // LAMESPEC: There seems no way to select a hash algorithm. The default
  18         // algorithm, is SHA1 because the class use the PKCS1MaskGenerationMethod -
  19         // which default to SHA1.
  20         public class RSAPKCS1KeyExchangeFormatter: AsymmetricKeyExchangeFormatter
  21         {
  22                 private RSA rsa;
  23                 private RandomNumberGenerator random;
  24
  25                 public RSAPKCS1KeyExchangeFormatter ()
  26                 {
  27                 }
  28
  29                 public RSAPKCS1KeyExchangeFormatter (AsymmetricAlgorithm key)
  30                 {
  31                         SetKey (key);
  32                 }
  33
  34                 public RandomNumberGenerator Rng
  35                 {
  36                         get { return random; }
  37                         set { random = value; }
  38                 }
  39
  40                 public override string Parameters
  41                 {
  42                         get { return "<enc:KeyEncryptionMethod enc:Algorithm=\"http://www.microsoft.com/xml/security/algorithm/PKCS1-v1.5-KeyEx\" xmlns:enc=\"http://www.microsoft.com/xml/security/encryption/v1.0\" />"; }
  43                 }
  44
  45                 public override byte[] CreateKeyExchange (byte[] rgbData)
  46                 {
  47                         if (random == null)
  48                                 random = RandomNumberGenerator.Create ();  // create default
  49                         return PKCS1.Encrypt_v15 (rsa, random, rgbData);
  50                 }
  51
  52                 public override byte[] CreateKeyExchange (byte[] rgbData, Type symAlgType)
  53                 {
  54                         // documentation says that symAlgType is not used !?!
  55                         return CreateKeyExchange (rgbData);
  56                 }
  57
  58                 public override void SetKey (AsymmetricAlgorithm key)
  59                 {
  60                         rsa = (RSA) key;
  61                 }
  62         }
  63 }