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

   1 //
   2 // AuthorityKeyIdentifierExtension.cs: Handles X.509 AuthorityKeyIdentifier 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-authorityKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 35 }
  42          *
  43          * AuthorityKeyIdentifier ::= SEQUENCE {
  44          *    keyIdentifier             [0] KeyIdentifier           OPTIONAL,
  45          *    authorityCertIssuer       [1] GeneralNames            OPTIONAL,
  46          *    authorityCertSerialNumber [2] CertificateSerialNumber OPTIONAL  }
  47          *
  48          * KeyIdentifier ::= OCTET STRING
  49          */
  50
  51         public class AuthorityKeyIdentifierExtension : X509Extension {
  52
  53                 private byte[] aki;
  54
  55                 public AuthorityKeyIdentifierExtension () : base ()
  56                 {
  57                         extnOid = "2.5.29.35";
  58                 }
  59
  60                 public AuthorityKeyIdentifierExtension (ASN1 asn1) : base (asn1)
  61                 {
  62                 }
  63
  64                 public AuthorityKeyIdentifierExtension (X509Extension extension) : base (extension)
  65                 {
  66                 }
  67
  68                 protected override void Decode ()
  69                 {
  70                         ASN1 sequence = new ASN1 (extnValue.Value);
  71                         if (sequence.Tag != 0x30)
  72                                 throw new ArgumentException ("Invalid AuthorityKeyIdentifier extension");
  73                         for (int i=0; i < sequence.Count; i++) {
  74                                 ASN1 el = sequence [i];
  75                                 switch (el.Tag) {
  76                                         case 0x80:
  77                                                 aki = el.Value;
  78                                                 break;
  79                                         case 0x81:
  80                                         case 0x82:
  81                                         default:
  82                                                 throw new ArgumentException ("Invalid AuthorityKeyIdentifier extension");
  83                                 }
  84                         }
  85                 }
  86
  87                 public override string Name {
  88                         get { return "Authority Key Identifier"; }
  89                 }
  90
  91                 public override string ToString ()
  92                 {
  93                         StringBuilder sb = new StringBuilder ();
  94                         if (aki != null) {
  95                                 // [0] KeyIdentifier
  96                                 int x = 0;
  97                                 sb.Append ("KeyID=");
  98                                 while (x < aki.Length) {
  99                                         sb.Append (aki [x].ToString ("X2", CultureInfo.InvariantCulture));
 100                                         if (x % 2 == 1)
 101                                                 sb.Append (" ");
 102                                         x++;
 103                                 }
 104                                 // [1] GeneralNames
 105                                 // TODO
 106                                 // [2] CertificateSerialNumber
 107                                 // TODO
 108                         }
 109                         return sb.ToString ();
 110                 }
 111         }
 112 }