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//
// System.Security.Cryptography.X509EnhancedKeyUsageExtension
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0 && SECURITY_DEP
using System.Text;
using Mono.Security;
namespace System.Security.Cryptography.X509Certificates {
public sealed class X509EnhancedKeyUsageExtension : X509Extension {
internal const string oid = "2.5.29.37";
internal const string friendlyName = "Enhanced Key Usage";
private OidCollection _enhKeyUsage;
private AsnDecodeStatus _status;
// constructors
public X509EnhancedKeyUsageExtension ()
{
_oid = new Oid (oid, friendlyName);
}
public X509EnhancedKeyUsageExtension (AsnEncodedData encodedEnhancedKeyUsages, bool critical)
{
// ignore the Oid provided by encodedKeyUsage (our rules!)
_oid = new Oid (oid, friendlyName);
_raw = encodedEnhancedKeyUsages.RawData;
base.Critical = critical;
_status = Decode (this.RawData);
}
public X509EnhancedKeyUsageExtension (OidCollection enhancedKeyUsages, bool critical)
{
if (enhancedKeyUsages == null)
throw new ArgumentNullException ("enhancedKeyUsages");
_oid = new Oid (oid, friendlyName);
base.Critical = critical;
_enhKeyUsage = enhancedKeyUsages.ReadOnlyCopy ();
RawData = Encode ();
}
// properties
public OidCollection EnhancedKeyUsages {
get {
switch (_status) {
case AsnDecodeStatus.Ok:
case AsnDecodeStatus.InformationNotAvailable:
if (_enhKeyUsage == null)
_enhKeyUsage = new OidCollection ();
_enhKeyUsage.ReadOnly = true;
return _enhKeyUsage;
default:
throw new CryptographicException ("Badly encoded extension.");
}
}
}
// methods
public override void CopyFrom (AsnEncodedData asnEncodedData)
{
if (asnEncodedData == null)
throw new ArgumentNullException ("encodedData");
X509Extension ex = (asnEncodedData as X509Extension);
if (ex == null)
throw new ArgumentException (Locale.GetText ("Wrong type."), "asnEncodedData");
if (ex._oid == null)
_oid = new Oid (oid, friendlyName);
else
_oid = new Oid (ex._oid);
RawData = ex.RawData;
base.Critical = ex.Critical;
// and we deal with the rest later
_status = Decode (this.RawData);
}
// internal
internal AsnDecodeStatus Decode (byte[] extension)
{
if ((extension == null) || (extension.Length == 0))
return AsnDecodeStatus.BadAsn;
if (extension [0] != 0x30)
return AsnDecodeStatus.BadTag;
if (_enhKeyUsage == null)
_enhKeyUsage = new OidCollection ();
try {
ASN1 ex = new ASN1 (extension);
if (ex.Tag != 0x30)
throw new CryptographicException (Locale.GetText ("Invalid ASN.1 Tag"));
for (int i=0; i < ex.Count; i++) {
_enhKeyUsage.Add (new Oid (ASN1Convert.ToOid (ex [i])));
}
}
catch {
return AsnDecodeStatus.BadAsn;
}
return AsnDecodeStatus.Ok;
}
internal byte[] Encode ()
{
ASN1 ex = new ASN1 (0x30);
foreach (Oid oid in _enhKeyUsage) {
ex.Add (ASN1Convert.FromOid (oid.Value));
}
return ex.GetBytes ();
}
internal override string ToString (bool multiLine)
{
switch (_status) {
case AsnDecodeStatus.BadAsn:
return String.Empty;
case AsnDecodeStatus.BadTag:
case AsnDecodeStatus.BadLength:
return FormatUnkownData (_raw);
case AsnDecodeStatus.InformationNotAvailable:
return "Information Not Available";
}
if (_oid.Value != oid)
return String.Format ("Unknown Key Usage ({0})", _oid.Value);
if (_enhKeyUsage.Count == 0)
return "Information Not Available";
StringBuilder sb = new StringBuilder ();
for (int i=0; i < _enhKeyUsage.Count; i++) {
Oid o = _enhKeyUsage [i];
switch (o.Value) {
case "1.3.6.1.5.5.7.3.1":
sb.Append ("Server Authentication (");
break;
default:
sb.Append ("Unknown Key Usage (");
break;
}
sb.Append (o.Value);
sb.Append (")");
if (multiLine)
sb.Append (Environment.NewLine);
else if (i != (_enhKeyUsage.Count - 1))
sb.Append (", ");
}
return sb.ToString ();
}
}
}
#endif
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