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//
// X509Extension.cs: Base class for all X.509 extensions.
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// (C) 2004 Novell (http://www.novell.com)
//
using System;
using System.Globalization;
using System.Text;
using Mono.Security;
namespace Mono.Security.X509 {
/*
* Extension ::= SEQUENCE {
* extnID OBJECT IDENTIFIER,
* critical BOOLEAN DEFAULT FALSE,
* extnValue OCTET STRING
* }
*/
#if INSIDE_CORLIB
internal
#else
public
#endif
class X509Extension {
protected string extnOid;
protected bool extnCritical;
protected ASN1 extnValue;
internal X509Extension ()
{
extnCritical = false;
}
public X509Extension (ASN1 asn1)
{
if ((asn1.Tag != 0x30) || (asn1.Count < 2))
throw new ArgumentException ("Invalid X.509 extension");
if (asn1[0].Tag != 0x06)
throw new ArgumentException ("Invalid X.509 extension");
extnOid = ASN1Convert.ToOid (asn1 [0]);
extnCritical = ((asn1[1].Tag == 0x01) && (asn1[1].Value[0] == 0xFF));
extnValue = asn1 [asn1.Count - 1]; // last element
Decode ();
}
public X509Extension (X509Extension extension) : this ()
{
if (extension == null)
throw new ArgumentNullException ("extension");
if ((extension.Value.Tag != 0x04) || (extension.Value.Count != 0))
throw new ArgumentException ("Invalid extension");
extnOid = extension.Oid;
extnCritical = extension.Critical;
extnValue = extension.Value;
Decode ();
}
protected virtual void Decode ()
{
}
protected virtual void Encode ()
{
}
public ASN1 ASN1 {
get {
ASN1 extension = new ASN1 (0x30);
extension.Add (ASN1Convert.FromOid (extnOid));
if (extnCritical)
extension.Add (new ASN1 (0x01, new byte [1] { 0x01 }));
ASN1 os = extension.Add (new ASN1 (0x04));
Encode ();
os.Add (extnValue);
return extension;
}
}
public string Oid {
get { return extnOid; }
}
public bool Critical {
get { return extnCritical; }
}
// this gets overrided with more meaningful names
public virtual string Name {
get { return extnOid; }
}
public ASN1 Value {
get { return extnValue; }
}
public override bool Equals (object obj)
{
if (obj == null)
return false;
X509Extension ex = (obj as X509Extension);
if (ex == null)
return false;
if (extnCritical != ex.extnCritical)
return false;
if (extnOid != ex.extnOid)
return false;
if (extnValue.Length != ex.extnValue.Length)
return false;
for (int i=0; i < extnValue.Length; i++) {
if (extnValue [i] != ex.extnValue [i])
return false;
}
return true;
}
public byte[] GetBytes ()
{
return ASN1.GetBytes ();
}
public override int GetHashCode ()
{
// OID should be unique in a collection of extensions
return extnOid.GetHashCode ();
}
private void WriteLine (StringBuilder sb, int n, int pos)
{
byte[] value = extnValue.Value;
int p = pos;
StringBuilder preview = new StringBuilder ();
for (int j=0; j < 8; j++) {
if (j < n) {
sb.Append (value [p++].ToString ("X2", CultureInfo.InvariantCulture));
sb.Append (" ");
}
else
sb.Append (" ");
}
sb.Append (" ");
p = pos;
for (int j=0; j < n; j++) {
byte b = value [p++];
if (b < 0x20)
sb.Append (".");
else
sb.Append (Convert.ToChar (b));
}
sb.Append (Environment.NewLine);
}
public override string ToString ()
{
StringBuilder sb = new StringBuilder ();
int div = (extnValue.Length >> 3);
int rem = (extnValue.Length - (div << 3));
int x = 0;
for (int i=0; i < div; i++) {
WriteLine (sb, 8, x);
x += 8;
}
WriteLine (sb, rem, x);
return sb.ToString ();
}
}
}
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