mcs/class/corlib/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 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Globalization;
  35 using System.Text;
  36
  37 using Mono.Security;
  38 using Mono.Security.X509;
  39
  40 namespace Mono.Security.X509.Extensions {
  41
  42         /*
  43          * id-ce-subjectKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 14 }
  44          *
  45          * SubjectKeyIdentifier ::= KeyIdentifier
  46          *
  47          * KeyIdentifier ::= OCTET STRING
  48          */
  49
  50 #if INSIDE_CORLIB
  51         internal
  52 #else
  53         public
  54 #endif
  55         class SubjectKeyIdentifierExtension : X509Extension {
  56
  57                 private byte[] ski;
  58
  59                 public SubjectKeyIdentifierExtension () : base ()
  60                 {
  61                         extnOid = "2.5.29.14";
  62                 }
  63
  64                 public SubjectKeyIdentifierExtension (ASN1 asn1) : base (asn1)
  65                 {
  66                 }
  67
  68                 public SubjectKeyIdentifierExtension (X509Extension extension) : base (extension)
  69                 {
  70                 }
  71
  72                 protected override void Decode ()
  73                 {
  74                         ASN1 sequence = new ASN1 (extnValue.Value);
  75                         if (sequence.Tag != 0x04)
  76                                 throw new ArgumentException ("Invalid SubjectKeyIdentifier extension");
  77                         ski = sequence.Value;
  78                 }
  79
  80                 public override string Name {
  81                         get { return "Subject Key Identifier"; }
  82                 }
  83
  84                 public byte[] Identifier {
  85                         get {
  86                                 if (ski == null)
  87                                         return null;
  88                                 return (byte[]) ski.Clone ();
  89                         }
  90                 }
  91
  92                 public override string ToString ()
  93                 {
  94                         if (ski == null)
  95                                 return null;
  96
  97                         StringBuilder sb = new StringBuilder ();
  98                         int x = 0;
  99                         while (x < ski.Length) {
 100                                 sb.Append (ski [x].ToString ("X2", CultureInfo.InvariantCulture));
 101                                 if (x % 2 == 1)
 102                                         sb.Append (" ");
 103                                 x++;
 104                         }
 105                         return sb.ToString ();
 106                 }
 107         }
 108 }