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 using Mono.Security.Cryptography;
  12
  13 namespace System.Security.Cryptography {
  14
  15         public class RSAPKCS1KeyExchangeDeformatter : AsymmetricKeyExchangeDeformatter {
  16
  17                 private RSA rsa;
  18                 private string param;
  19                 private RandomNumberGenerator random;
  20
  21                 public RSAPKCS1KeyExchangeDeformatter ()
  22                 {
  23                         rsa = null;
  24                 }
  25
  26                 public RSAPKCS1KeyExchangeDeformatter (AsymmetricAlgorithm key)
  27                 {
  28                         SetKey (key);
  29                 }
  30
  31                 public override string Parameters {
  32                         get { return param; }
  33                         set { param = value; }
  34                 }
  35
  36                 public RandomNumberGenerator RNG {
  37                         get { return random; }
  38                         set { random = value; }
  39                 }
  40
  41                 public override byte[] DecryptKeyExchange (byte[] rgbData)
  42                 {
  43                         if (rsa == null)
  44                                 throw new CryptographicException ();
  45                         return PKCS1.Decrypt_v15 (rsa, rgbData);
  46                 }
  47
  48                 public override void SetKey (AsymmetricAlgorithm key)
  49                 {
  50                         if (key is RSA) {
  51                                 rsa = (RSA)key;
  52                         }
  53                         else
  54                                 throw new CryptographicException ();
  55                 }
  56         }
  57 }