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

   1 //
   2 // KeyAttributesExtension.cs: Handles X.509 *DEPRECATED* KeyAttributes extensions.
   3 //
   4 // Author:
   5 //      Sebastien Pouliot  <sebastien@ximian.com>
   6 //
   7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   8 // (C) 2004 Novell (http://www.novell.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Globalization;
  34 using System.Text;
  35
  36 using Mono.Security;
  37 using Mono.Security.X509;
  38
  39 namespace Mono.Security.X509.Extensions {
  40         public class KeyAttributesExtension : X509Extension {
  41
  42                 private byte[] keyId;
  43                 private int kubits;
  44                 private DateTime notBefore;
  45                 private DateTime notAfter;
  46
  47                 public KeyAttributesExtension () : base ()
  48                 {
  49                         extnOid = "2.5.29.2";
  50                 }
  51
  52                 public KeyAttributesExtension (ASN1 asn1) : base (asn1)
  53                 {
  54                 }
  55
  56                 public KeyAttributesExtension (X509Extension extension) : base (extension)
  57                 {
  58                 }
  59
  60                 protected override void Decode ()
  61                 {
  62                         ASN1 seq = new ASN1 (extnValue.Value);
  63                         if (seq.Tag != 0x30)
  64                                 throw new ArgumentException ("Invalid KeyAttributesExtension extension");
  65                         int n = 0;
  66                         // check for KeyIdentifier
  67                         if (n < seq.Count) {
  68                                 ASN1 item = seq [n];
  69                                 if (item.Tag == 0x04) {
  70                                         n++;
  71                                         keyId = item.Value;
  72                                 }
  73                         }
  74                         // check for KeyUsage
  75                         if (n < seq.Count) {
  76                                 ASN1 item = seq [n];
  77                                 if (item.Tag == 0x03) {
  78                                         n++;
  79                                         int i = 1; // byte zero has the number of unused bits (ASN1's BITSTRING)
  80                                         while (i < item.Value.Length)
  81                                                 kubits = (kubits << 8) + item.Value [i++];
  82                                 }
  83                         }
  84                         // check for PrivateKeyValidity
  85                         if (n < seq.Count) {
  86                                 ASN1 item = seq [n];
  87                                 if (item.Tag == 0x30) {
  88                                         int i = 0;
  89                                         if (i < item.Count) {
  90                                                 ASN1 dt = item [i];
  91                                                 if (dt.Tag == 0x81) {
  92                                                         i++;
  93                                                         notBefore = ASN1Convert.ToDateTime (dt);
  94                                                 }
  95                                         }
  96                                         if (i < item.Count) {
  97                                                 ASN1 dt = item [i];
  98                                                 if (dt.Tag == 0x82)
  99                                                         notAfter = ASN1Convert.ToDateTime (dt);
 100                                         }
 101                                 }
 102                         }
 103                 }
 104
 105                 public byte[] KeyIdentifier {
 106                         get {
 107                                 if (keyId == null)
 108                                         return null;
 109                                 return (byte[]) keyId.Clone ();
 110                         }
 111                 }
 112
 113                 public override string Name {
 114                         get { return "Key Attributes"; }
 115                 }
 116
 117                 public DateTime NotAfter {
 118                         get { return notAfter; }
 119                 }
 120
 121                 public DateTime NotBefore {
 122                         get { return notBefore; }
 123                 }
 124
 125                 public bool Support (KeyUsages usage)
 126                 {
 127                         int x = Convert.ToInt32 (usage, CultureInfo.InvariantCulture);
 128                         return ((x & kubits) == x);
 129                 }
 130
 131                 public override string ToString ()
 132                 {
 133                         StringBuilder sb = new StringBuilder ();
 134                         if (keyId != null) {
 135                                 sb.Append ("KeyID=");
 136                                 int x = 0;
 137                                 while (x < keyId.Length) {
 138                                         sb.Append (keyId [x].ToString ("X2", CultureInfo.InvariantCulture));
 139                                         if (x % 2 == 1)
 140                                                 sb.Append (" ");
 141                                         x++;
 142                                 }
 143                                 sb.Append (Environment.NewLine);
 144                         }
 145
 146                         if (kubits != 0) {
 147                                 sb.Append ("Key Usage=");
 148                                 const string separator = " , ";
 149                                 if (Support (KeyUsages.digitalSignature))
 150                                         sb.Append ("Digital Signature");
 151                                 if (Support (KeyUsages.nonRepudiation)) {
 152                                         if (sb.Length > 0)
 153                                                 sb.Append (separator);
 154                                         sb.Append ("Non-Repudiation");
 155                                 }
 156                                 if (Support (KeyUsages.keyEncipherment)) {
 157                                         if (sb.Length > 0)
 158                                                 sb.Append (separator);
 159                                         sb.Append ("Key Encipherment");
 160                                 }
 161                                 if (Support (KeyUsages.dataEncipherment)) {
 162                                         if (sb.Length > 0)
 163                                                 sb.Append (separator);
 164                                         sb.Append ("Data Encipherment");
 165                                 }
 166                                 if (Support (KeyUsages.keyAgreement)) {
 167                                         if (sb.Length > 0)
 168                                                 sb.Append (separator);
 169                                         sb.Append ("Key Agreement");
 170                                 }
 171                                 if (Support (KeyUsages.keyCertSign)) {
 172                                         if (sb.Length > 0)
 173                                                 sb.Append (separator);
 174                                         sb.Append ("Certificate Signing");
 175                                 }
 176                                 if (Support (KeyUsages.cRLSign)) {
 177                                         if (sb.Length > 0)
 178                                                 sb.Append (separator);
 179                                         sb.Append ("CRL Signing");
 180                                 }
 181                                 if (Support (KeyUsages.encipherOnly)) {
 182                                         if (sb.Length > 0)
 183                                                 sb.Append (separator);
 184                                         sb.Append ("Encipher Only ");   // ???
 185                                 }
 186                                 if (Support (KeyUsages.decipherOnly)) {
 187                                         if (sb.Length > 0)
 188                                                 sb.Append (separator);
 189                                         sb.Append ("Decipher Only");    // ???
 190                                 }
 191                                 sb.Append ("(");
 192                                 sb.Append (kubits.ToString ("X2", CultureInfo.InvariantCulture));
 193                                 sb.Append (")");
 194                                 sb.Append (Environment.NewLine);
 195                         }
 196
 197                         if (notBefore != DateTime.MinValue) {
 198                                 sb.Append ("Not Before=");
 199                                 sb.Append (notBefore.ToString (CultureInfo.CurrentUICulture));
 200                                 sb.Append (Environment.NewLine);
 201                         }
 202                         if (notAfter != DateTime.MinValue) {
 203                                 sb.Append ("Not After=");
 204                                 sb.Append (notAfter.ToString (CultureInfo.CurrentUICulture));
 205                                 sb.Append (Environment.NewLine);
 206                         }
 207                         return sb.ToString ();
 208                 }
 209         }
 210 }