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//
// KeyAttributesExtension.cs: Handles X.509 *DEPRECATED* KeyAttributes extensions.
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// (C) 2004 Novell (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.
//
using System;
using System.Globalization;
using System.Text;
using Mono.Security;
using Mono.Security.X509;
namespace Mono.Security.X509.Extensions {
public class KeyAttributesExtension : X509Extension {
private byte[] keyId;
private int kubits;
private DateTime notBefore;
private DateTime notAfter;
public KeyAttributesExtension () : base ()
{
extnOid = "2.5.29.2";
}
public KeyAttributesExtension (ASN1 asn1) : base (asn1)
{
}
public KeyAttributesExtension (X509Extension extension) : base (extension)
{
}
protected override void Decode ()
{
ASN1 seq = new ASN1 (extnValue.Value);
if (seq.Tag != 0x30)
throw new ArgumentException ("Invalid KeyAttributesExtension extension");
int n = 0;
// check for KeyIdentifier
if (n < seq.Count) {
ASN1 item = seq [n];
if (item.Tag == 0x04) {
n++;
keyId = item.Value;
}
}
// check for KeyUsage
if (n < seq.Count) {
ASN1 item = seq [n];
if (item.Tag == 0x03) {
n++;
int i = 1; // byte zero has the number of unused bits (ASN1's BITSTRING)
while (i < item.Value.Length)
kubits = (kubits << 8) + item.Value [i++];
}
}
// check for PrivateKeyValidity
if (n < seq.Count) {
ASN1 item = seq [n];
if (item.Tag == 0x30) {
int i = 0;
if (i < item.Count) {
ASN1 dt = item [i];
if (dt.Tag == 0x81) {
i++;
notBefore = ASN1Convert.ToDateTime (dt);
}
}
if (i < item.Count) {
ASN1 dt = item [i];
if (dt.Tag == 0x82)
notAfter = ASN1Convert.ToDateTime (dt);
}
}
}
}
public byte[] KeyIdentifier {
get {
if (keyId == null)
return null;
return (byte[]) keyId.Clone ();
}
}
public override string Name {
get { return "Key Attributes"; }
}
public DateTime NotAfter {
get { return notAfter; }
}
public DateTime NotBefore {
get { return notBefore; }
}
public bool Support (KeyUsages usage)
{
int x = Convert.ToInt32 (usage, CultureInfo.InvariantCulture);
return ((x & kubits) == x);
}
public override string ToString ()
{
StringBuilder sb = new StringBuilder ();
if (keyId != null) {
sb.Append ("KeyID=");
int x = 0;
while (x < keyId.Length) {
sb.Append (keyId [x].ToString ("X2", CultureInfo.InvariantCulture));
if (x % 2 == 1)
sb.Append (" ");
x++;
}
sb.Append (Environment.NewLine);
}
if (kubits != 0) {
sb.Append ("Key Usage=");
const string separator = " , ";
if (Support (KeyUsages.digitalSignature))
sb.Append ("Digital Signature");
if (Support (KeyUsages.nonRepudiation)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Non-Repudiation");
}
if (Support (KeyUsages.keyEncipherment)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Key Encipherment");
}
if (Support (KeyUsages.dataEncipherment)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Data Encipherment");
}
if (Support (KeyUsages.keyAgreement)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Key Agreement");
}
if (Support (KeyUsages.keyCertSign)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Certificate Signing");
}
if (Support (KeyUsages.cRLSign)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("CRL Signing");
}
if (Support (KeyUsages.encipherOnly)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Encipher Only "); // ???
}
if (Support (KeyUsages.decipherOnly)) {
if (sb.Length > 0)
sb.Append (separator);
sb.Append ("Decipher Only"); // ???
}
sb.Append ("(");
sb.Append (kubits.ToString ("X2", CultureInfo.InvariantCulture));
sb.Append (")");
sb.Append (Environment.NewLine);
}
if (notBefore != DateTime.MinValue) {
sb.Append ("Not Before=");
sb.Append (notBefore.ToString (CultureInfo.CurrentUICulture));
sb.Append (Environment.NewLine);
}
if (notAfter != DateTime.MinValue) {
sb.Append ("Not After=");
sb.Append (notAfter.ToString (CultureInfo.CurrentUICulture));
sb.Append (Environment.NewLine);
}
return sb.ToString ();
}
}
}
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