2 // System.Security.Cryptography.X509EnhancedKeyUsageExtension
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
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:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
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.
35 namespace System.Security.Cryptography.X509Certificates {
37 public sealed class X509EnhancedKeyUsageExtension : X509Extension {
39 internal const string oid = "2.5.29.37";
40 internal const string friendlyName = "Enhanced Key Usage";
42 private OidCollection _enhKeyUsage;
43 private AsnDecodeStatus _status;
47 public X509EnhancedKeyUsageExtension ()
49 _oid = new Oid (oid, friendlyName);
52 public X509EnhancedKeyUsageExtension (AsnEncodedData encodedEnhancedKeyUsages, bool critical)
54 // ignore the Oid provided by encodedKeyUsage (our rules!)
55 _oid = new Oid (oid, friendlyName);
56 _raw = encodedEnhancedKeyUsages.RawData;
57 base.Critical = critical;
58 _status = Decode (this.RawData);
61 public X509EnhancedKeyUsageExtension (OidCollection enhancedKeyUsages, bool critical)
63 if (enhancedKeyUsages == null)
64 throw new ArgumentNullException ("enhancedKeyUsages");
66 _oid = new Oid (oid, friendlyName);
67 base.Critical = critical;
68 _enhKeyUsage = enhancedKeyUsages.ReadOnlyCopy ();
74 public OidCollection EnhancedKeyUsages {
77 case AsnDecodeStatus.Ok:
78 case AsnDecodeStatus.InformationNotAvailable:
79 _enhKeyUsage.ReadOnly = true;
82 throw new CryptographicException ("Badly encoded extension.");
89 public override void CopyFrom (AsnEncodedData asnEncodedData)
91 if (asnEncodedData == null)
92 throw new ArgumentException ("encodedData");
93 // MS BUG throw new ArgumentNullException ("encodedData");
95 X509Extension ex = (asnEncodedData as X509Extension);
97 throw new ArgumentException (Locale.GetText ("Wrong type."), "asnEncodedData");
100 _oid = new Oid (oid, friendlyName);
102 _oid = new Oid (ex._oid);
104 RawData = ex.RawData;
105 base.Critical = ex.Critical;
106 // and we deal with the rest later
107 _status = Decode (this.RawData);
112 internal AsnDecodeStatus Decode (byte[] extension)
114 if ((extension == null) || (extension.Length == 0))
115 return AsnDecodeStatus.BadAsn;
116 if (extension [0] != 0x30)
117 return AsnDecodeStatus.BadTag;
119 if (_enhKeyUsage == null)
120 _enhKeyUsage = new OidCollection ();
123 ASN1 ex = new ASN1 (extension);
125 throw new CryptographicException (Locale.GetText ("Invalid ASN.1 Tag"));
126 for (int i=0; i < ex.Count; i++) {
127 _enhKeyUsage.Add (new Oid (ASN1Convert.ToOid (ex [i])));
131 return AsnDecodeStatus.BadAsn;
134 return AsnDecodeStatus.Ok;
137 internal byte[] Encode ()
139 ASN1 ex = new ASN1 (0x30);
140 foreach (Oid oid in _enhKeyUsage) {
141 ex.Add (ASN1Convert.FromOid (oid.Value));
143 return ex.GetBytes ();
146 internal override string ToString (bool multiLine)
149 case AsnDecodeStatus.BadAsn:
151 case AsnDecodeStatus.BadTag:
152 case AsnDecodeStatus.BadLength:
153 return FormatUnkownData (_raw);
154 case AsnDecodeStatus.InformationNotAvailable:
155 return "Information Not Available";
158 if (_oid.Value != oid)
159 return String.Format ("Unknown Key Usage ({0})", _oid.Value);
160 if (_enhKeyUsage.Count == 0)
161 return "Information Not Available";
165 StringBuilder sb = new StringBuilder ();
167 for (int i=0; i < _enhKeyUsage.Count; i++) {
168 Oid o = _enhKeyUsage [i];
170 case "1.3.6.1.5.5.7.3.1":
171 sb.Append ("Server Authentication (");
174 sb.Append ("Unknown Key Usage (");
181 sb.Append (Environment.NewLine);
182 else if (i != (_enhKeyUsage.Count - 1))
186 return sb.ToString ();