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208 lines
5.2 KiB
C#
208 lines
5.2 KiB
C#
//
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// X509Extension.cs: Base class for all X.509 extensions.
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//
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// Author:
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// Sebastien Pouliot <sebastien@ximian.com>
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//
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// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Globalization;
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using System.Text;
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namespace Emby.Common.Implementations.Security
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{
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/*
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* Extension ::= SEQUENCE {
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* extnID OBJECT IDENTIFIER,
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* critical BOOLEAN DEFAULT FALSE,
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* extnValue OCTET STRING
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* }
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*/
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public class X509Extension {
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protected string extnOid;
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protected bool extnCritical;
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protected ASN1 extnValue;
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protected X509Extension ()
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{
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extnCritical = false;
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}
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public X509Extension (ASN1 asn1)
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{
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if ((asn1.Tag != 0x30) || (asn1.Count < 2))
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throw new ArgumentException (("Invalid X.509 extension."));
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if (asn1[0].Tag != 0x06)
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throw new ArgumentException (("Invalid X.509 extension."));
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extnOid = ASN1Convert.ToOid (asn1[0]);
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extnCritical = ((asn1[1].Tag == 0x01) && (asn1[1].Value[0] == 0xFF));
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// last element is an octet string which may need to be decoded
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extnValue = asn1 [asn1.Count - 1];
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if ((extnValue.Tag == 0x04) && (extnValue.Length > 0) && (extnValue.Count == 0)) {
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try {
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ASN1 encapsulated = new ASN1 (extnValue.Value);
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extnValue.Value = null;
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extnValue.Add (encapsulated);
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}
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catch {
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// data isn't ASN.1
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}
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}
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Decode ();
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}
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public X509Extension (X509Extension extension)
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{
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if (extension == null)
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throw new ArgumentNullException ("extension");
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if ((extension.Value == null) || (extension.Value.Tag != 0x04) || (extension.Value.Count != 1))
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throw new ArgumentException (("Invalid X.509 extension."));
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extnOid = extension.Oid;
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extnCritical = extension.Critical;
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extnValue = extension.Value;
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Decode ();
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}
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// encode the extension *into* an OCTET STRING
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protected virtual void Decode ()
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{
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}
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// decode the extension from *inside* an OCTET STRING
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protected virtual void Encode ()
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{
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}
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public ASN1 ASN1 {
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get {
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ASN1 extension = new ASN1 (0x30);
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extension.Add (ASN1Convert.FromOid (extnOid));
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if (extnCritical)
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extension.Add (new ASN1 (0x01, new byte [1] { 0xFF }));
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Encode ();
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extension.Add (extnValue);
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return extension;
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}
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}
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public string Oid {
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get { return extnOid; }
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}
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public bool Critical {
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get { return extnCritical; }
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set { extnCritical = value; }
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}
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// this gets overrided with more meaningful names
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public virtual string Name {
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get { return extnOid; }
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}
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public ASN1 Value {
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get {
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if (extnValue == null) {
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Encode ();
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}
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return extnValue;
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}
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}
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public override bool Equals (object obj)
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{
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if (obj == null)
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return false;
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X509Extension ex = (obj as X509Extension);
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if (ex == null)
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return false;
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if (extnCritical != ex.extnCritical)
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return false;
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if (extnOid != ex.extnOid)
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return false;
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if (extnValue.Length != ex.extnValue.Length)
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return false;
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for (int i=0; i < extnValue.Length; i++) {
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if (extnValue [i] != ex.extnValue [i])
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return false;
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}
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return true;
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}
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public byte[] GetBytes ()
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{
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return ASN1.GetBytes ();
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}
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public override int GetHashCode ()
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{
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// OID should be unique in a collection of extensions
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return extnOid.GetHashCode ();
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}
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private void WriteLine (StringBuilder sb, int n, int pos)
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{
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byte[] value = extnValue.Value;
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int p = pos;
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for (int j=0; j < 8; j++) {
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if (j < n) {
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sb.Append (value [p++].ToString ("X2", CultureInfo.InvariantCulture));
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sb.Append (" ");
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}
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else
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sb.Append (" ");
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}
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sb.Append (" ");
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p = pos;
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for (int j=0; j < n; j++) {
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byte b = value [p++];
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if (b < 0x20)
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sb.Append (".");
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else
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sb.Append (Convert.ToChar (b));
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}
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sb.Append (Environment.NewLine);
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}
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public override string ToString ()
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{
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StringBuilder sb = new StringBuilder ();
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int div = (extnValue.Length >> 3);
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int rem = (extnValue.Length - (div << 3));
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int x = 0;
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for (int i=0; i < div; i++) {
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WriteLine (sb, 8, x);
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x += 8;
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}
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WriteLine (sb, rem, x);
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return sb.ToString ();
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}
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}
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}
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