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 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 #if NET_2_0
  41         [ComVisible (true)]
  42 #endif
  43         public abstract class RSA : AsymmetricAlgorithm {
  44
  45                 public static new RSA Create ()
  46                 {
  47                         return Create ("System.Security.Cryptography.RSA");
  48                 }
  49
  50                 public static new RSA Create (string algName)
  51                 {
  52                         return (RSA) CryptoConfig.CreateFromName (algName);
  53                 }
  54
  55 #if NET_2_0
  56                 protected RSA ()
  57 #else
  58                 public RSA ()
  59 #endif
  60                 {
  61                 }
  62
  63                 public abstract byte[] EncryptValue (byte[] rgb);
  64
  65                 public abstract byte[] DecryptValue (byte[] rgb);
  66
  67                 public abstract RSAParameters ExportParameters (bool include);
  68
  69                 public abstract void ImportParameters (RSAParameters parameters);
  70
  71                 internal void ZeroizePrivateKey (RSAParameters parameters)
  72                 {
  73                         if (parameters.P != null)
  74                                 Array.Clear (parameters.P, 0, parameters.P.Length);
  75                         if (parameters.Q != null)
  76                                 Array.Clear (parameters.Q, 0, parameters.Q.Length);
  77                         if (parameters.DP != null)
  78                                 Array.Clear (parameters.DP, 0, parameters.DP.Length);
  79                         if (parameters.DQ != null)
  80                                 Array.Clear (parameters.DQ, 0, parameters.DQ.Length);
  81                         if (parameters.InverseQ != null)
  82                                 Array.Clear (parameters.InverseQ, 0, parameters.InverseQ.Length);
  83                         if (parameters.D != null)
  84                                 Array.Clear (parameters.D, 0, parameters.D.Length);
  85                 }
  86
  87                 private byte[] GetNamedParam (SecurityElement se, string param)
  88                 {
  89                         SecurityElement sep = se.SearchForChildByTag (param);
  90                         if (sep == null)
  91                                 return null;
  92                         return Convert.FromBase64String (sep.Text);
  93                 }
  94
  95                 public override void FromXmlString (string xmlString)
  96                 {
  97                         if (xmlString == null)
  98                                 throw new ArgumentNullException ("xmlString");
  99
 100                         RSAParameters rsaParams = new RSAParameters ();
 101                         try {
 102                                 SecurityParser sp = new SecurityParser ();
 103                                 sp.LoadXml (xmlString);
 104                                 SecurityElement se = sp.ToXml ();
 105
 106                                 rsaParams.P = GetNamedParam (se, "P");
 107                                 rsaParams.Q = GetNamedParam (se, "Q");
 108                                 rsaParams.D = GetNamedParam (se, "D");
 109                                 rsaParams.DP = GetNamedParam (se, "DP");
 110                                 rsaParams.DQ = GetNamedParam (se, "DQ");
 111                                 rsaParams.InverseQ = GetNamedParam (se, "InverseQ");
 112                                 rsaParams.Exponent = GetNamedParam (se, "Exponent");
 113                                 rsaParams.Modulus = GetNamedParam (se, "Modulus");
 114                                 ImportParameters (rsaParams);
 115                         }
 116                         catch (Exception e) {
 117                                 ZeroizePrivateKey (rsaParams);
 118                                 throw new CryptographicException (
 119                                         Locale.GetText ("Couldn't decode XML"), e);
 120                         }
 121                         finally {
 122                                 ZeroizePrivateKey (rsaParams);
 123                         }
 124                 }
 125
 126                 public override string ToXmlString (bool includePrivateParameters)
 127                 {
 128                         StringBuilder sb = new StringBuilder ();
 129                         RSAParameters rsaParams = ExportParameters (includePrivateParameters);
 130                         try {
 131                                 sb.Append ("<RSAKeyValue>");
 132
 133                                 sb.Append ("<Modulus>");
 134                                 sb.Append (Convert.ToBase64String (rsaParams.Modulus));
 135                                 sb.Append ("</Modulus>");
 136
 137                                 sb.Append ("<Exponent>");
 138                                 sb.Append (Convert.ToBase64String (rsaParams.Exponent));
 139                                 sb.Append ("</Exponent>");
 140
 141                                 if (includePrivateParameters) {
 142                                         // we want an ArgumentNullException is only the D is missing, but a
 143                                         // CryptographicException if other parameters (CRT) are missings
 144                                         if (rsaParams.D == null) {
 145                                                 string msg = Locale.GetText ("Missing D parameter for the private key.");
 146                                                 throw new ArgumentNullException (msg);
 147                                         } else if ((rsaParams.P == null) || (rsaParams.Q == null) || (rsaParams.DP == null) ||
 148                                                 (rsaParams.DQ == null) || (rsaParams.InverseQ == null)) {
 149                                                 // note: we can import a private key, using FromXmlString,
 150                                                 // without the CRT parameters but we export it using ToXmlString!
 151                                                 string msg = Locale.GetText ("Missing some CRT parameters for the private key.");
 152                                                 throw new CryptographicException (msg);
 153                                         }
 154
 155                                         sb.Append ("<P>");
 156                                         sb.Append (Convert.ToBase64String (rsaParams.P));
 157                                         sb.Append ("</P>");
 158
 159                                         sb.Append ("<Q>");
 160                                         sb.Append (Convert.ToBase64String (rsaParams.Q));
 161                                         sb.Append ("</Q>");
 162
 163                                         sb.Append ("<DP>");
 164                                         sb.Append (Convert.ToBase64String (rsaParams.DP));
 165                                         sb.Append ("</DP>");
 166
 167                                         sb.Append ("<DQ>");
 168                                         sb.Append (Convert.ToBase64String (rsaParams.DQ));
 169                                         sb.Append ("</DQ>");
 170
 171                                         sb.Append ("<InverseQ>");
 172                                         sb.Append (Convert.ToBase64String (rsaParams.InverseQ));
 173                                         sb.Append ("</InverseQ>");
 174
 175                                         sb.Append ("<D>");
 176                                         sb.Append (Convert.ToBase64String (rsaParams.D));
 177                                         sb.Append ("</D>");
 178                                 }
 179
 180                                 sb.Append ("</RSAKeyValue>");
 181                         }
 182                         catch {
 183                                 ZeroizePrivateKey (rsaParams);
 184                                 throw;
 185                         }
 186
 187                         return sb.ToString ();
 188                 }
 189         }
 190 }