class/corlib/System.Security.Cryptography/RSA.cs

   1 //
   2 // System.Security.Cryptography.RSA.cs
   3 //
   4 // Authors:
   5 //      Dan Lewis (dihlewis@yahoo.co.uk)
   6 //      Sebastien Pouliot (sebastien@ximian.com)
   7 //
   8 // (C) 2002
   9 // Portions (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
  10 // Copyright (C) 2004-2006,2008 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Globalization;
  33 using System.Runtime.InteropServices;
  34 using System.Text;
  35
  36 using Mono.Xml;
  37
  38 namespace System.Security.Cryptography {
  39
  40         [ComVisible (true)]
  41         public abstract class RSA : AsymmetricAlgorithm {
  42
  43                 public static new RSA Create ()
  44                 {
  45                         return Create ("System.Security.Cryptography.RSA");
  46                 }
  47
  48                 public static new RSA Create (string algName)
  49                 {
  50                         return (RSA) CryptoConfig.CreateFromName (algName);
  51                 }
  52
  53                 protected RSA ()
  54                 {
  55                 }
  56
  57                 public abstract byte[] EncryptValue (byte[] rgb);
  58
  59                 public abstract byte[] DecryptValue (byte[] rgb);
  60
  61                 public abstract RSAParameters ExportParameters (bool includePrivateParameters);
  62
  63                 public abstract void ImportParameters (RSAParameters parameters);
  64
  65                 internal void ZeroizePrivateKey (RSAParameters parameters)
  66                 {
  67                         if (parameters.P != null)
  68                                 Array.Clear (parameters.P, 0, parameters.P.Length);
  69                         if (parameters.Q != null)
  70                                 Array.Clear (parameters.Q, 0, parameters.Q.Length);
  71                         if (parameters.DP != null)
  72                                 Array.Clear (parameters.DP, 0, parameters.DP.Length);
  73                         if (parameters.DQ != null)
  74                                 Array.Clear (parameters.DQ, 0, parameters.DQ.Length);
  75                         if (parameters.InverseQ != null)
  76                                 Array.Clear (parameters.InverseQ, 0, parameters.InverseQ.Length);
  77                         if (parameters.D != null)
  78                                 Array.Clear (parameters.D, 0, parameters.D.Length);
  79                 }
  80
  81                 public override void FromXmlString (string xmlString)
  82                 {
  83                         if (xmlString == null)
  84                                 throw new ArgumentNullException ("xmlString");
  85
  86                         RSAParameters rsaParams = new RSAParameters ();
  87                         try {
  88                                 rsaParams.P = GetNamedParam (xmlString, "P");
  89                                 rsaParams.Q = GetNamedParam (xmlString, "Q");
  90                                 rsaParams.D = GetNamedParam (xmlString, "D");
  91                                 rsaParams.DP = GetNamedParam (xmlString, "DP");
  92                                 rsaParams.DQ = GetNamedParam (xmlString, "DQ");
  93                                 rsaParams.InverseQ = GetNamedParam (xmlString, "InverseQ");
  94                                 rsaParams.Exponent = GetNamedParam (xmlString, "Exponent");
  95                                 rsaParams.Modulus = GetNamedParam (xmlString, "Modulus");
  96                                 ImportParameters (rsaParams);
  97                         }
  98                         catch (Exception e) {
  99                                 ZeroizePrivateKey (rsaParams);
 100                                 throw new CryptographicException (
 101                                         Locale.GetText ("Couldn't decode XML"), e);
 102                         }
 103                         finally {
 104                                 ZeroizePrivateKey (rsaParams);
 105                         }
 106                 }
 107
 108                 public override string ToXmlString (bool includePrivateParameters)
 109                 {
 110                         StringBuilder sb = new StringBuilder ();
 111                         RSAParameters rsaParams = ExportParameters (includePrivateParameters);
 112                         try {
 113                                 sb.Append ("<RSAKeyValue>");
 114
 115                                 sb.Append ("<Modulus>");
 116                                 sb.Append (Convert.ToBase64String (rsaParams.Modulus));
 117                                 sb.Append ("</Modulus>");
 118
 119                                 sb.Append ("<Exponent>");
 120                                 sb.Append (Convert.ToBase64String (rsaParams.Exponent));
 121                                 sb.Append ("</Exponent>");
 122
 123                                 if (includePrivateParameters) {
 124                                         // we want an ArgumentNullException is only the D is missing, but a
 125                                         // CryptographicException if other parameters (CRT) are missings
 126                                         if (rsaParams.D == null) {
 127                                                 string msg = Locale.GetText ("Missing D parameter for the private key.");
 128                                                 throw new ArgumentNullException (msg);
 129                                         } else if ((rsaParams.P == null) || (rsaParams.Q == null) || (rsaParams.DP == null) ||
 130                                                 (rsaParams.DQ == null) || (rsaParams.InverseQ == null)) {
 131                                                 // note: we can import a private key, using FromXmlString,
 132                                                 // without the CRT parameters but we export it using ToXmlString!
 133                                                 string msg = Locale.GetText ("Missing some CRT parameters for the private key.");
 134                                                 throw new CryptographicException (msg);
 135                                         }
 136
 137                                         sb.Append ("<P>");
 138                                         sb.Append (Convert.ToBase64String (rsaParams.P));
 139                                         sb.Append ("</P>");
 140
 141                                         sb.Append ("<Q>");
 142                                         sb.Append (Convert.ToBase64String (rsaParams.Q));
 143                                         sb.Append ("</Q>");
 144
 145                                         sb.Append ("<DP>");
 146                                         sb.Append (Convert.ToBase64String (rsaParams.DP));
 147                                         sb.Append ("</DP>");
 148
 149                                         sb.Append ("<DQ>");
 150                                         sb.Append (Convert.ToBase64String (rsaParams.DQ));
 151                                         sb.Append ("</DQ>");
 152
 153                                         sb.Append ("<InverseQ>");
 154                                         sb.Append (Convert.ToBase64String (rsaParams.InverseQ));
 155                                         sb.Append ("</InverseQ>");
 156
 157                                         sb.Append ("<D>");
 158                                         sb.Append (Convert.ToBase64String (rsaParams.D));
 159                                         sb.Append ("</D>");
 160                                 }
 161
 162                                 sb.Append ("</RSAKeyValue>");
 163                         }
 164                         catch {
 165                                 ZeroizePrivateKey (rsaParams);
 166                                 throw;
 167                         }
 168
 169                         return sb.ToString ();
 170                 }
 171         }
 172 }