mcs/class/Mono.Security/Mono.Security.X509.Extensions/SubjectKeyIdentifierExtension.cs

   1 //
   2 // SubjectKeyIdentifierExtension.cs: Handles X.509 SubjectKeyIdentifier extensions.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // (C) 2004 Novell (http://www.novell.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Globalization;
  33 using System.Text;
  34
  35 using Mono.Security;
  36 using Mono.Security.X509;
  37
  38 namespace Mono.Security.X509.Extensions {
  39
  40         /*
  41          * id-ce-subjectKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 14 }
  42          *
  43          * SubjectKeyIdentifier ::= KeyIdentifier
  44          *
  45          * KeyIdentifier ::= OCTET STRING
  46          */
  47
  48 #if INSIDE_CORLIB
  49         internal
  50 #else
  51         public
  52 #endif
  53         class SubjectKeyIdentifierExtension : X509Extension {
  54
  55                 private byte[] ski;
  56
  57                 public SubjectKeyIdentifierExtension () : base ()
  58                 {
  59                         extnOid = "2.5.29.14";
  60                 }
  61
  62                 public SubjectKeyIdentifierExtension (ASN1 asn1) : base (asn1)
  63                 {
  64                 }
  65
  66                 public SubjectKeyIdentifierExtension (X509Extension extension) : base (extension)
  67                 {
  68                 }
  69
  70                 protected override void Decode ()
  71                 {
  72                         ASN1 sequence = new ASN1 (extnValue.Value);
  73                         if (sequence.Tag != 0x04)
  74                                 throw new ArgumentException ("Invalid SubjectKeyIdentifier extension");
  75                         ski = sequence.Value;
  76                 }
  77
  78                 public override string Name {
  79                         get { return "Subject Key Identifier"; }
  80                 }
  81
  82                 public byte[] Identifier {
  83                         get {
  84                                 if (ski == null)
  85                                         return null;
  86                                 return (byte[]) ski.Clone ();
  87                         }
  88                 }
  89
  90                 public override string ToString ()
  91                 {
  92                         if (ski == null)
  93                                 return null;
  94
  95                         StringBuilder sb = new StringBuilder ();
  96                         int x = 0;
  97                         while (x < ski.Length) {
  98                                 sb.Append (ski [x].ToString ("X2", CultureInfo.InvariantCulture));
  99                                 if (x % 2 == 1)
 100                                         sb.Append (" ");
 101                                 x++;
 102                         }
 103                         return sb.ToString ();
 104                 }
 105         }
 106 }