mcs/class/corlib/System.Security.Cryptography/RSAPKCS1KeyExchangeDeformatter.cs

   1 //
   2 // RSAPKCS1KeyExchangeDeformatter.cs - Handles PKCS#1 v.1.5 keyex decryption.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (spouliot@motus.com)
   6 //
   7 // (C) 2002 Motus Technologies Inc. (http://www.motus.com)
   8 //
   9
  10 using System;
  11
  12 namespace System.Security.Cryptography {
  13
  14 public class RSAPKCS1KeyExchangeDeformatter : AsymmetricKeyExchangeDeformatter {
  15
  16         private RSA rsa;
  17         private string param;
  18         private RandomNumberGenerator random;
  19
  20         public RSAPKCS1KeyExchangeDeformatter ()
  21         {
  22                 rsa = null;
  23         }
  24
  25         public RSAPKCS1KeyExchangeDeformatter (AsymmetricAlgorithm key)
  26         {
  27                 SetKey (key);
  28         }
  29
  30         public override string Parameters {
  31                 get { return param; }
  32                 set { param = value; }
  33         }
  34
  35         public RandomNumberGenerator RNG {
  36                 get { return random; }
  37                 set { random = value; }
  38         }
  39
  40         public override byte[] DecryptKeyExchange (byte[] rgbData)
  41         {
  42                 if (rsa == null)
  43                         throw new CryptographicException ();
  44                 return PKCS1.Decrypt_v15 (rsa, rgbData);
  45         }
  46
  47         public override void SetKey (AsymmetricAlgorithm key)
  48         {
  49                 if (key is RSA) {
  50                         rsa = (RSA)key;
  51                 }
  52                 else
  53                         throw new CryptographicException ();
  54         }
  55 }
  56
  57 }