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

   1 //
   2 // ExtendedKeyUsageExtension.cs: Handles X.509 ExtendedKeyUsage extensions.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot (spouliot@motus.com)
   6 //
   7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   8 //
   9
  10 using System;
  11 using System.Collections;
  12 using System.Text;
  13
  14 using Mono.Security;
  15 using Mono.Security.X509;
  16
  17 namespace Mono.Security.X509.Extensions {
  18
  19         /*
  20          * id-ce-extKeyUsage OBJECT IDENTIFIER ::= { id-ce 37 }
  21          *
  22          * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
  23          *
  24          * KeyPurposeId ::= OBJECT IDENTIFIER
  25          */
  26
  27         public class ExtendedKeyUsageExtension : X509Extension {
  28
  29                 private ArrayList keyPurpose;
  30
  31                 public ExtendedKeyUsageExtension () : base ()
  32                 {
  33                         extnOid = "2.5.29.37";
  34                         keyPurpose = new ArrayList ();
  35                 }
  36
  37                 public ExtendedKeyUsageExtension (ASN1 asn1) : base (asn1) {}
  38
  39                 public ExtendedKeyUsageExtension (X509Extension extension) : base (extension) {}
  40
  41                 protected override void Decode ()
  42                 {
  43                         keyPurpose = new ArrayList ();
  44                         ASN1 sequence = new ASN1 (extnValue.Value);
  45                         if (sequence.Tag != 0x30)
  46                                 throw new ArgumentException ("Invalid ExtendedKeyUsage extension");
  47                         // for every policy OID
  48                         for (int i=0; i < sequence.Count; i++)
  49                                 keyPurpose.Add (ASN1Convert.ToOID (sequence [i]));
  50                 }
  51
  52                 protected override void Encode ()
  53                 {
  54                         if (extnValue == null) {
  55                                 extnValue = new ASN1 (0x30);
  56                                 foreach (string oid in keyPurpose) {
  57                                         extnValue.Add (ASN1Convert.FromOID (oid));
  58                                 }
  59                         }
  60                 }
  61
  62                 public ArrayList KeyPurpose {
  63                         get { return keyPurpose; }
  64                 }
  65
  66                 public override string Name {
  67                         get { return "Extended Key Usage"; }
  68                 }
  69
  70                 // serverAuth           1.3.6.1.5.5.7.3.1
  71                 // clientAuth           1.3.6.1.5.5.7.3.2
  72                 // codeSigning          1.3.6.1.5.5.7.3.3
  73                 // emailProtection      1.3.6.1.5.5.7.3.4
  74                 // timeStamping         1.3.6.1.5.5.7.3.8
  75                 // OCSPSigning          1.3.6.1.5.5.7.3.9
  76                 public override string ToString ()
  77                 {
  78                         StringBuilder sb = new StringBuilder ();
  79                         foreach (string s in keyPurpose) {
  80                                 switch (s) {
  81                                         case "1.3.6.1.5.5.7.3.3":
  82                                                 sb.Append ("Code Signing");
  83                                                 break;
  84                                         default:
  85                                                 sb.Append ("unknown");
  86                                                 break;
  87                                 }
  88                                 sb.Append (" (");
  89                                 sb.Append (s);
  90                                 sb.Append (")");
  91                                 sb.Append (Environment.NewLine);
  92                         }
  93                         return sb.ToString ();
  94                 }
  95         }
  96 }