mcs/class/corlib/System.Reflection/StrongNameKeyPair.cs

   1 //
   2 // System.Reflection.StrongNameKeyPair.cs
   3 //
   4 // Authors:
   5 //      Kevin Winchester (kwin@ns.sympatico.ca)
   6 //      Sebastien Pouliot (sebastien@ximian.com)
   7 //
   8 // (C) 2002 Kevin Winchester
   9 // Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
  10 // (C) 2004 Novell (http://www.novell.com)
  11 //
  12
  13 //
  14 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System.IO;
  37 using System.Security.Cryptography;
  38
  39 using Mono.Security;
  40 using Mono.Security.Cryptography;
  41
  42 namespace System.Reflection {
  43
  44 [Serializable]
  45 public class StrongNameKeyPair
  46 {
  47         private byte[] _publicKey;
  48         private string _keyPairContainer;
  49         private bool _keyPairExported;
  50         private byte[] _keyPairArray;
  51
  52         [NonSerialized]
  53         private RSA _rsa;
  54
  55         public StrongNameKeyPair (byte[] keyPairArray)
  56         {
  57                 if (keyPairArray == null)
  58                         throw new ArgumentNullException ("keyPairArray");
  59
  60                 LoadKey (keyPairArray);
  61                 GetRSA ();
  62         }
  63
  64         public StrongNameKeyPair (FileStream keyPairFile)
  65         {
  66                 if (keyPairFile == null)
  67                         throw new ArgumentNullException ("keyPairFile");
  68
  69                 byte[] input = new byte [keyPairFile.Length];
  70                 keyPairFile.Read (input, 0, input.Length);
  71                 LoadKey (input);
  72                 GetRSA ();
  73         }
  74
  75         public StrongNameKeyPair (string keyPairContainer)
  76         {
  77                 // named key container
  78                 if (keyPairContainer == null)
  79                         throw new ArgumentNullException ("keyPairContainer");
  80
  81                 _keyPairContainer = keyPairContainer;
  82                 GetRSA ();
  83         }
  84
  85         private RSA GetRSA ()
  86         {
  87                 if (_rsa != null) return _rsa;
  88
  89                 if (_keyPairArray != null) {
  90                         try {
  91                                 _rsa = CryptoConvert.FromCapiKeyBlob (_keyPairArray);
  92                         }
  93                         catch {
  94                                 // exception is thrown when getting PublicKey
  95                                 // to match MS implementation
  96                                 _keyPairArray = null;
  97                         }
  98                 }
  99                 else if (_keyPairContainer != null) {
 100                         CspParameters csp = new CspParameters ();
 101                         csp.KeyContainerName = _keyPairContainer;
 102                         _rsa = new RSACryptoServiceProvider (csp);
 103                 }
 104                 return _rsa;
 105         }
 106
 107         private void LoadKey (byte[] key)
 108         {
 109                 try {
 110                         // check for ECMA key
 111                         if (key.Length == 16) {
 112                                 int i = 0;
 113                                 int sum = 0;
 114                                 while (i < key.Length)
 115                                         sum += key [i++];
 116                                 if (sum == 4) {
 117                                         // it is the ECMA key
 118                                         _publicKey = (byte[]) key.Clone ();
 119                                 }
 120                         }
 121                         else
 122                                 _keyPairArray = key;
 123                 }
 124                 catch
 125                 {
 126                         // exception is thrown when getting PublicKey
 127                         // to match MS implementation
 128                 }
 129         }
 130
 131         public byte[] PublicKey {
 132                 get {
 133                         if (_publicKey == null) {
 134                                 RSA rsa = GetRSA ();
 135                                 // ECMA "key" is valid but doesn't produce a RSA instance
 136                                 if (rsa == null)
 137                                         throw new ArgumentException ("invalid keypair");
 138
 139                                 byte[] blob = CryptoConvert.ToCapiKeyBlob (rsa, false);
 140                                 _publicKey = new byte [blob.Length + 12];
 141                                 // The first 12 bytes are documented at:
 142                                 // http://msdn.microsoft.com/library/en-us/cprefadd/html/grfungethashfromfile.asp
 143                                 // ALG_ID - Signature
 144                                 _publicKey[0] = 0x00;
 145                                 _publicKey[1] = 0x24;
 146                                 _publicKey[2] = 0x00;
 147                                 _publicKey[3] = 0x00;
 148                                 // ALG_ID - Hash
 149                                 _publicKey[4] = 0x04;
 150                                 _publicKey[5] = 0x80;
 151                                 _publicKey[6] = 0x00;
 152                                 _publicKey[7] = 0x00;
 153                                 // Length of Public Key (in bytes)
 154                                 int lastPart = blob.Length;
 155                                 _publicKey[8] = (byte)(lastPart % 256);
 156                                 _publicKey[9] = (byte)(lastPart / 256); // just in case
 157                                 _publicKey[10] = 0x00;
 158                                 _publicKey[11] = 0x00;
 159
 160                                 Buffer.BlockCopy (blob, 0, _publicKey, 12, blob.Length);
 161                         }
 162                         return _publicKey;
 163                 }
 164         }
 165
 166         internal StrongName StrongName ()
 167         {
 168                 RSA rsa = GetRSA ();
 169                 if (rsa != null)
 170                         return new StrongName (rsa);
 171                 if (_publicKey != null)
 172                         return new StrongName (_publicKey);
 173                 return null;
 174         }
 175 }
 176
 177 }