mcs/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 #if FULL_AOT_RUNTIME
  46                         return new System.Security.Cryptography.RSACryptoServiceProvider ();
  47 #else
  48                         return Create ("System.Security.Cryptography.RSA");
  49 #endif
  50                 }
  51
  52                 public static new RSA Create (string algName)
  53                 {
  54                         return (RSA) CryptoConfig.CreateFromName (algName);
  55                 }
  56
  57                 protected RSA ()
  58                 {
  59                 }
  60
  61                 public abstract byte[] EncryptValue (byte[] rgb);
  62
  63                 public abstract byte[] DecryptValue (byte[] rgb);
  64
  65                 public abstract RSAParameters ExportParameters (bool includePrivateParameters);
  66
  67                 public abstract void ImportParameters (RSAParameters parameters);
  68
  69                 internal void ZeroizePrivateKey (RSAParameters parameters)
  70                 {
  71                         if (parameters.P != null)
  72                                 Array.Clear (parameters.P, 0, parameters.P.Length);
  73                         if (parameters.Q != null)
  74                                 Array.Clear (parameters.Q, 0, parameters.Q.Length);
  75                         if (parameters.DP != null)
  76                                 Array.Clear (parameters.DP, 0, parameters.DP.Length);
  77                         if (parameters.DQ != null)
  78                                 Array.Clear (parameters.DQ, 0, parameters.DQ.Length);
  79                         if (parameters.InverseQ != null)
  80                                 Array.Clear (parameters.InverseQ, 0, parameters.InverseQ.Length);
  81                         if (parameters.D != null)
  82                                 Array.Clear (parameters.D, 0, parameters.D.Length);
  83                 }
  84
  85                 public override void FromXmlString (string xmlString)
  86                 {
  87                         if (xmlString == null)
  88                                 throw new ArgumentNullException ("xmlString");
  89
  90                         RSAParameters rsaParams = new RSAParameters ();
  91                         try {
  92                                 rsaParams.P = GetNamedParam (xmlString, "P");
  93                                 rsaParams.Q = GetNamedParam (xmlString, "Q");
  94                                 rsaParams.D = GetNamedParam (xmlString, "D");
  95                                 rsaParams.DP = GetNamedParam (xmlString, "DP");
  96                                 rsaParams.DQ = GetNamedParam (xmlString, "DQ");
  97                                 rsaParams.InverseQ = GetNamedParam (xmlString, "InverseQ");
  98                                 rsaParams.Exponent = GetNamedParam (xmlString, "Exponent");
  99                                 rsaParams.Modulus = GetNamedParam (xmlString, "Modulus");
 100                                 ImportParameters (rsaParams);
 101                         }
 102                         catch (Exception e) {
 103                                 ZeroizePrivateKey (rsaParams);
 104                                 throw new CryptographicException (
 105                                         Locale.GetText ("Couldn't decode XML"), e);
 106                         }
 107                         finally {
 108                                 ZeroizePrivateKey (rsaParams);
 109                         }
 110                 }
 111
 112                 public override string ToXmlString (bool includePrivateParameters)
 113                 {
 114                         StringBuilder sb = new StringBuilder ();
 115                         RSAParameters rsaParams = ExportParameters (includePrivateParameters);
 116                         try {
 117                                 sb.Append ("<RSAKeyValue>");
 118
 119                                 sb.Append ("<Modulus>");
 120                                 sb.Append (Convert.ToBase64String (rsaParams.Modulus));
 121                                 sb.Append ("</Modulus>");
 122
 123                                 sb.Append ("<Exponent>");
 124                                 sb.Append (Convert.ToBase64String (rsaParams.Exponent));
 125                                 sb.Append ("</Exponent>");
 126
 127                                 if (includePrivateParameters) {
 128                                         // we want an ArgumentNullException is only the D is missing, but a
 129                                         // CryptographicException if other parameters (CRT) are missings
 130                                         if (rsaParams.D == null) {
 131                                                 string msg = Locale.GetText ("Missing D parameter for the private key.");
 132                                                 throw new ArgumentNullException (msg);
 133                                         } else if ((rsaParams.P == null) || (rsaParams.Q == null) || (rsaParams.DP == null) ||
 134                                                 (rsaParams.DQ == null) || (rsaParams.InverseQ == null)) {
 135                                                 // note: we can import a private key, using FromXmlString,
 136                                                 // without the CRT parameters but we export it using ToXmlString!
 137                                                 string msg = Locale.GetText ("Missing some CRT parameters for the private key.");
 138                                                 throw new CryptographicException (msg);
 139                                         }
 140
 141                                         sb.Append ("<P>");
 142                                         sb.Append (Convert.ToBase64String (rsaParams.P));
 143                                         sb.Append ("</P>");
 144
 145                                         sb.Append ("<Q>");
 146                                         sb.Append (Convert.ToBase64String (rsaParams.Q));
 147                                         sb.Append ("</Q>");
 148
 149                                         sb.Append ("<DP>");
 150                                         sb.Append (Convert.ToBase64String (rsaParams.DP));
 151                                         sb.Append ("</DP>");
 152
 153                                         sb.Append ("<DQ>");
 154                                         sb.Append (Convert.ToBase64String (rsaParams.DQ));
 155                                         sb.Append ("</DQ>");
 156
 157                                         sb.Append ("<InverseQ>");
 158                                         sb.Append (Convert.ToBase64String (rsaParams.InverseQ));
 159                                         sb.Append ("</InverseQ>");
 160
 161                                         sb.Append ("<D>");
 162                                         sb.Append (Convert.ToBase64String (rsaParams.D));
 163                                         sb.Append ("</D>");
 164                                 }
 165
 166                                 sb.Append ("</RSAKeyValue>");
 167                         }
 168                         catch {
 169                                 ZeroizePrivateKey (rsaParams);
 170                                 throw;
 171                         }
 172
 173                         return sb.ToString ();
 174                 }
 175         }
 176 }