class/corlib/System.Security.Permissions/StrongNamePublicKeyBlob.cs

   1 //
   2 // StrongNamePublicKeyBlob.cs: Strong Name Public Key Blob
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // (C) 2002 Motus Technologies Inc. (http://www.motus.com)
   8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System.Runtime.InteropServices;
  31 using System.Text;
  32
  33 namespace System.Security.Permissions {
  34
  35 [ComVisible (true)]
  36 [Serializable]
  37 public sealed class StrongNamePublicKeyBlob {
  38
  39         internal byte[] pubkey;
  40
  41         public StrongNamePublicKeyBlob (byte[] publicKey)
  42         {
  43                 if (publicKey == null)
  44                         throw new ArgumentNullException ("publicKey");
  45                 // Note: No sanity check ?
  46                 pubkey = publicKey;
  47         }
  48
  49         internal static StrongNamePublicKeyBlob FromString (string s)
  50         {
  51                 if ((s == null) || (s.Length == 0))
  52                         return null;
  53
  54                 int length = s.Length / 2;
  55
  56                 byte [] array = new byte [length];
  57
  58                 for (int i = 0, j = 0; i < s.Length; i += 2, j ++) {
  59                         byte left = CharToByte (s [i]);
  60                         byte right = CharToByte (s [i+1]);
  61                         array [j] = Convert.ToByte (left * 16 + right);
  62                 }
  63
  64                 return new StrongNamePublicKeyBlob (array);
  65         }
  66
  67         static byte CharToByte (char c)
  68         {
  69                 char ch = Char.ToLowerInvariant (c);
  70
  71                 if (Char.IsDigit (ch))
  72                         return (byte) (ch - '0');
  73                 else
  74                         return (byte) (ch - 'a' + 10);
  75         }
  76
  77         public override bool Equals (object obj)
  78         {
  79                 StrongNamePublicKeyBlob snpkb = (obj as StrongNamePublicKeyBlob);
  80                 if (snpkb == null)
  81                         return false;
  82
  83                 bool result = (pubkey.Length == snpkb.pubkey.Length);
  84                 if (result) {
  85                         for (int i = 0; i < pubkey.Length; i++) {
  86                                 if (pubkey[i] != snpkb.pubkey[i])
  87                                         return false;
  88                         }
  89                 }
  90                 return result;
  91         }
  92
  93         // LAMESPEC: non standard get hash code - (a) Why ??? (b) How ???
  94         // It seems to be the first four bytes of the public key data
  95         // which seems like non sense as all valid public key will have the same header ?
  96         public override int GetHashCode ()
  97         {
  98                 int hash = 0;
  99                 int i = 0;
 100                 // a BAD public key can be less than 4 bytes
 101                 int n = Math.Min (pubkey.Length, 4);
 102                 while (i < n)
 103                         hash = (hash << 8) + pubkey [i++];
 104                 return hash;
 105         }
 106
 107         public override string ToString ()
 108         {
 109                 StringBuilder sb = new StringBuilder ();
 110                 for (int i=0; i < pubkey.Length; i++)
 111                         sb.Append (pubkey[i].ToString ("X2"));
 112                 return sb.ToString ();
 113         }
 114 }
 115
 116 }