2 // X509Extension.cs: Base class for all X.509 extensions.
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // (C) 2003 Motus Technologies Inc. (http://www.motus.com)
8 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 using System
.Globalization
;
36 namespace Mono
.Security
.X509
{
38 * Extension ::= SEQUENCE {
39 * extnID OBJECT IDENTIFIER,
40 * critical BOOLEAN DEFAULT FALSE,
41 * extnValue OCTET STRING
51 protected string extnOid
;
52 protected bool extnCritical
;
53 protected ASN1 extnValue
;
55 protected X509Extension ()
60 public X509Extension (ASN1 asn1
)
62 if ((asn1
.Tag
!= 0x30) || (asn1
.Count
< 2))
63 throw new ArgumentException (Locale
.GetText ("Invalid X.509 extension."));
64 if (asn1
[0].Tag
!= 0x06)
65 throw new ArgumentException (Locale
.GetText ("Invalid X.509 extension."));
67 extnOid
= ASN1Convert
.ToOid (asn1
[0]);
68 extnCritical
= ((asn1
[1].Tag
== 0x01) && (asn1
[1].Value
[0] == 0xFF));
69 // last element is an octet string which may need to be decoded
70 extnValue
= asn1
[asn1
.Count
- 1];
71 if ((extnValue
.Tag
== 0x04) && (extnValue
.Length
> 0) && (extnValue
.Count
== 0)) {
73 ASN1 encapsulated
= new ASN1 (extnValue
.Value
);
74 extnValue
.Value
= null;
75 extnValue
.Add (encapsulated
);
84 public X509Extension (X509Extension extension
)
86 if (extension
== null)
87 throw new ArgumentNullException ("extension");
88 if ((extension
.Value
== null) || (extension
.Value
.Tag
!= 0x04) || (extension
.Value
.Count
!= 1))
89 throw new ArgumentException (Locale
.GetText ("Invalid X.509 extension."));
91 extnOid
= extension
.Oid
;
92 extnCritical
= extension
.Critical
;
93 extnValue
= extension
.Value
;
97 // encode the extension *into* an OCTET STRING
98 protected virtual void Decode ()
102 // decode the extension from *inside* an OCTET STRING
103 protected virtual void Encode ()
109 ASN1 extension
= new ASN1 (0x30);
110 extension
.Add (ASN1Convert
.FromOid (extnOid
));
112 extension
.Add (new ASN1 (0x01, new byte [1] { 0xFF }
));
114 extension
.Add (extnValue
);
120 get { return extnOid; }
123 public bool Critical
{
124 get { return extnCritical; }
125 set { extnCritical = value; }
128 // this gets overrided with more meaningful names
129 public virtual string Name
{
130 get { return extnOid; }
135 if (extnValue
== null) {
142 public override bool Equals (object obj
)
147 X509Extension ex
= (obj
as X509Extension
);
151 if (extnCritical
!= ex
.extnCritical
)
153 if (extnOid
!= ex
.extnOid
)
155 if (extnValue
.Length
!= ex
.extnValue
.Length
)
158 for (int i
=0; i
< extnValue
.Length
; i
++) {
159 if (extnValue
[i
] != ex
.extnValue
[i
])
165 public byte[] GetBytes ()
167 return ASN1
.GetBytes ();
170 public override int GetHashCode ()
172 // OID should be unique in a collection of extensions
173 return extnOid
.GetHashCode ();
176 private void WriteLine (StringBuilder sb
, int n
, int pos
)
178 byte[] value = extnValue
.Value
;
180 for (int j
=0; j
< 8; j
++) {
182 sb
.Append (value [p
++].ToString ("X2", CultureInfo
.InvariantCulture
));
190 for (int j
=0; j
< n
; j
++) {
191 byte b
= value [p
++];
195 sb
.Append (Convert
.ToChar (b
));
197 sb
.Append (Environment
.NewLine
);
200 public override string ToString ()
202 StringBuilder sb
= new StringBuilder ();
203 int div
= (extnValue
.Length
>> 3);
204 int rem
= (extnValue
.Length
- (div
<< 3));
206 for (int i
=0; i
< div
; i
++) {
207 WriteLine (sb
, 8, x
);
210 WriteLine (sb
, rem
, x
);
211 return sb
.ToString ();