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 using System;
  11 using System.Text;
  12
  13 using Mono.Security;
  14 using Mono.Security.X509;
  15
  16 namespace Mono.Security.X509.Extensions {
  17
  18         /*
  19          * id-ce-subjectKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 14 }
  20          *
  21          * SubjectKeyIdentifier ::= KeyIdentifier
  22          *
  23          * KeyIdentifier ::= OCTET STRING
  24          */
  25
  26         public class SubjectKeyIdentifierExtension : X509Extension {
  27
  28                 private byte[] ski;
  29
  30                 public SubjectKeyIdentifierExtension () : base ()
  31                 {
  32                         extnOid = "2.5.29.14";
  33                 }
  34
  35                 public SubjectKeyIdentifierExtension (ASN1 asn1) : base (asn1) {}
  36
  37                 public SubjectKeyIdentifierExtension (X509Extension extension) : base (extension) {}
  38
  39                 protected override void Decode ()
  40                 {
  41                         ASN1 sequence = new ASN1 (extnValue.Value);
  42                         if (sequence.Tag != 0x04)
  43                                 throw new ArgumentException ("Invalid SubjectKeyIdentifier extension");
  44                         ski = sequence.Value;
  45                 }
  46
  47                 public override string Name {
  48                         get { return "Subject Key Identifier"; }
  49                 }
  50
  51                 public byte[] Identifier {
  52                         get { return (byte[]) ski.Clone (); }
  53                 }
  54
  55                 public override string ToString ()
  56                 {
  57                         if (ski == null)
  58                                 return null;
  59
  60                         StringBuilder sb = new StringBuilder ();
  61                         int x = 0;
  62                         while (x < ski.Length) {
  63                                 sb.Append (ski [x].ToString ("X2"));
  64                                 if (x % 2 == 1)
  65                                         sb.Append (" ");
  66                                 x++;
  67                         }
  68                         return sb.ToString ();
  69                 }
  70         }
  71 }