//
// AsnEncodedData.cs - System.Security.Cryptography.AsnEncodedData
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005 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 SECURITY_DEP || MOONLIGHT
using System.Security.Cryptography.X509Certificates;
using System.Text;
using Mono.Security;
using Mono.Security.Cryptography;
namespace System.Security.Cryptography{
internal enum AsnDecodeStatus {
NotDecoded = -1,
Ok = 0,
BadAsn = 1,
BadTag = 2,
BadLength = 3,
InformationNotAvailable = 4
}
public class AsnEncodedData {
internal Oid _oid;
internal byte[] _raw;
// constructors
protected AsnEncodedData ()
{
}
public AsnEncodedData (string oid, byte[] rawData)
{
_oid = new Oid (oid);
RawData = rawData;
}
public AsnEncodedData (Oid oid, byte[] rawData)
{
Oid = oid;
RawData = rawData;
// yes, here oid == null is legal (by design),
// but no, it would not be legal for an oid string
// see MSDN FDBK11479
}
public AsnEncodedData (AsnEncodedData asnEncodedData)
{
if (asnEncodedData == null)
throw new ArgumentNullException ("asnEncodedData");
if (asnEncodedData._oid != null)
Oid = new Oid (asnEncodedData._oid);
RawData = asnEncodedData._raw;
}
public AsnEncodedData (byte[] rawData)
{
RawData = rawData;
}
// properties
public Oid Oid {
get { return _oid; }
set {
if (value == null)
_oid = null;
else
_oid = new Oid (value);
}
}
public byte[] RawData {
get { return _raw; }
set {
if (value == null)
throw new ArgumentNullException ("RawData");
_raw = (byte[])value.Clone ();
}
}
// methods
public virtual void CopyFrom (AsnEncodedData asnEncodedData)
{
if (asnEncodedData == null)
throw new ArgumentNullException ("asnEncodedData");
if (asnEncodedData._oid == null)
Oid = null;
else
Oid = new Oid (asnEncodedData._oid);
RawData = asnEncodedData._raw;
}
public virtual string Format (bool multiLine)
{
if (_raw == null)
return String.Empty;
if (_oid == null)
return Default (multiLine);
return ToString (multiLine);
}
// internal decoding/formatting methods
internal virtual string ToString (bool multiLine)
{
switch (_oid.Value) {
// fx supported objects
case X509BasicConstraintsExtension.oid:
return BasicConstraintsExtension (multiLine);
case X509EnhancedKeyUsageExtension.oid:
return EnhancedKeyUsageExtension (multiLine);
case X509KeyUsageExtension.oid:
return KeyUsageExtension (multiLine);
case X509SubjectKeyIdentifierExtension.oid:
return SubjectKeyIdentifierExtension (multiLine);
// other known objects (i.e. supported structure) -
// but without any corresponding framework class
case Oid.oidSubjectAltName:
return SubjectAltName (multiLine);
case Oid.oidNetscapeCertType:
return NetscapeCertType (multiLine);
default:
return Default (multiLine);
}
}
internal string Default (bool multiLine)
{
StringBuilder sb = new StringBuilder ();
for (int i=0; i < _raw.Length; i++) {
sb.Append (_raw [i].ToString ("x2"));
if (i != _raw.Length - 1)
sb.Append (" ");
}
return sb.ToString ();
}
// Indirectly (undocumented but) supported extensions
internal string BasicConstraintsExtension (bool multiLine)
{
try {
X509BasicConstraintsExtension bc = new X509BasicConstraintsExtension (this, false);
return bc.ToString (multiLine);
}
catch {
return String.Empty;
}
}
internal string EnhancedKeyUsageExtension (bool multiLine)
{
try {
X509EnhancedKeyUsageExtension eku = new X509EnhancedKeyUsageExtension (this, false);
return eku.ToString (multiLine);
}
catch {
return String.Empty;
}
}
internal string KeyUsageExtension (bool multiLine)
{
try {
X509KeyUsageExtension ku = new X509KeyUsageExtension (this, false);
return ku.ToString (multiLine);
}
catch {
return String.Empty;
}
}
internal string SubjectKeyIdentifierExtension (bool multiLine)
{
try {
X509SubjectKeyIdentifierExtension ski = new X509SubjectKeyIdentifierExtension (this, false);
return ski.ToString (multiLine);
}
catch {
return String.Empty;
}
}
// Indirectly (undocumented but) supported extensions
internal string SubjectAltName (bool multiLine)
{
if (_raw.Length < 5)
return "Information Not Available";
try {
ASN1 ex = new ASN1 (_raw);
StringBuilder sb = new StringBuilder ();
for (int i=0; i < ex.Count; i++) {
ASN1 el = ex [i];
string type = null;
string name = null;
switch (el.Tag) {
case 0x81:
type = "RFC822 Name=";
name = Encoding.ASCII.GetString (el.Value);
break;
case 0x82:
type = "DNS Name=";
name = Encoding.ASCII.GetString (el.Value);
break;
default:
type = String.Format ("Unknown ({0})=", el.Tag);
name = CryptoConvert.ToHex (el.Value);
break;
}
sb.Append (type);
sb.Append (name);
if (multiLine) {
sb.Append (Environment.NewLine);
} else if (i < ex.Count - 1) {
sb.Append (", ");
}
}
return sb.ToString ();
}
catch {
return String.Empty;
}
}
internal string NetscapeCertType (bool multiLine)
{
// 4 byte long, BITSTRING (0x03), Value length of 2
if ((_raw.Length < 4) || (_raw [0] != 0x03) || (_raw [1] != 0x02))
return "Information Not Available";
// first value byte is the number of unused bits
int value = (_raw [3] >> _raw [2]) << _raw [2];
StringBuilder sb = new StringBuilder ();
if ((value & 0x80) == 0x80) {
sb.Append ("SSL Client Authentication");
}
if ((value & 0x40) == 0x40) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("SSL Server Authentication");
}
if ((value & 0x20) == 0x20) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("SMIME");
}
if ((value & 0x10) == 0x10) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("Signature"); // a.k.a. Object Signing / Code Signing
}
if ((value & 0x08) == 0x08) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("Unknown cert type");
}
if ((value & 0x04) == 0x04) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("SSL CA"); // CA == Certificate Authority
}
if ((value & 0x02) == 0x02) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("SMIME CA");
}
if ((value & 0x01) == 0x01) {
if (sb.Length > 0)
sb.Append (", ");
sb.Append ("Signature CA");
}
sb.AppendFormat (" ({0})", value.ToString ("x2"));
return sb.ToString ();
}
}
}
#endif
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