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 // Copyright (C) 2004-2005,2007 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Globalization;
  31 using System.Text;
  32
  33 using Mono.Security;
  34 using Mono.Security.X509;
  35
  36 namespace Mono.Security.X509.Extensions {
  37
  38         /*
  39          * id-ce-authorityKeyIdentifier OBJECT IDENTIFIER ::=  { id-ce 35 }
  40          *
  41          * AuthorityKeyIdentifier ::= SEQUENCE {
  42          *    keyIdentifier             [0] KeyIdentifier           OPTIONAL,
  43          *    authorityCertIssuer       [1] GeneralNames            OPTIONAL,
  44          *    authorityCertSerialNumber [2] CertificateSerialNumber OPTIONAL  }
  45          *
  46          * KeyIdentifier ::= OCTET STRING
  47          */
  48
  49 #if INSIDE_SYSTEM
  50         internal
  51 #else
  52         public
  53 #endif
  54         class AuthorityKeyIdentifierExtension : X509Extension {
  55
  56                 private byte[] aki;
  57
  58                 public AuthorityKeyIdentifierExtension () : base ()
  59                 {
  60                         extnOid = "2.5.29.35";
  61                 }
  62
  63                 public AuthorityKeyIdentifierExtension (ASN1 asn1) : base (asn1)
  64                 {
  65                 }
  66
  67                 public AuthorityKeyIdentifierExtension (X509Extension extension) : base (extension)
  68                 {
  69                 }
  70
  71                 protected override void Decode ()
  72                 {
  73                         ASN1 sequence = new ASN1 (extnValue.Value);
  74                         if (sequence.Tag != 0x30)
  75                                 throw new ArgumentException ("Invalid AuthorityKeyIdentifier extension");
  76                         for (int i=0; i < sequence.Count; i++) {
  77                                 ASN1 el = sequence [i];
  78                                 switch (el.Tag) {
  79                                         case 0x80:
  80                                                 aki = el.Value;
  81                                                 break;
  82                                         default:
  83                                                 // don't throw on stuff we don't yet support
  84                                                 // e.g. authorityCertIssuer/authorityCertSerialNumber
  85                                                 break;
  86                                 }
  87                         }
  88                 }
  89
  90                 protected override void Encode ()
  91                 {
  92                         ASN1 seq = new ASN1 (0x30);
  93                         if (aki == null) {
  94                                 throw new InvalidOperationException ("Invalid AuthorityKeyIdentifier extension");
  95                         }
  96
  97                         seq.Add (new ASN1 (0x80, aki));
  98                         extnValue = new ASN1 (0x04);
  99                         extnValue.Add (seq);
 100                 }
 101
 102                 public override string Name {
 103                         get { return "Authority Key Identifier"; }
 104                 }
 105
 106                 public byte[] Identifier {
 107                         get {
 108                                 if (aki == null)
 109                                         return null;
 110                                 return (byte[]) aki.Clone ();
 111                         }
 112                         set { aki = value; }
 113                 }
 114
 115                 public override string ToString ()
 116                 {
 117                         StringBuilder sb = new StringBuilder ();
 118                         if (aki != null) {
 119                                 // [0] KeyIdentifier
 120                                 int x = 0;
 121                                 sb.Append ("KeyID=");
 122                                 while (x < aki.Length) {
 123                                         sb.Append (aki [x].ToString ("X2", CultureInfo.InvariantCulture));
 124                                         if (x % 2 == 1)
 125                                                 sb.Append (" ");
 126                                         x++;
 127                                 }
 128                                 // [1] GeneralNames
 129                                 // TODO
 130                                 // [2] CertificateSerialNumber
 131                                 // TODO
 132                         }
 133                         return sb.ToString ();
 134                 }
 135         }
 136 }