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//
// XmlDecryptionTransform.cs - XmlDecryptionTransform implementation for XML Encryption
//
// Author:
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2004
//
// 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
using System.Collections;
using System.IO;
using System.Xml;
namespace System.Security.Cryptography.Xml {
public class XmlDecryptionTransform : Transform {
#region Fields
EncryptedXml encryptedXml;
Type[] inputTypes;
Type[] outputTypes;
object inputObj;
ArrayList exceptUris;
object lockObject;
const string NamespaceUri = "http://www.w3.org/2002/07/decrypt#";
#endregion // Fields
#region Constructors
public XmlDecryptionTransform ()
{
Algorithm = XmlSignature.AlgorithmNamespaces.XmlDecryptionTransform;
encryptedXml = new EncryptedXml ();
exceptUris = new ArrayList ();
lockObject = new object ();
}
#endregion // Constructors
#region Properties
public EncryptedXml EncryptedXml {
get { return encryptedXml; }
set { encryptedXml = value; }
}
public override Type[] InputTypes {
get {
if (inputTypes == null) {
lock (lockObject) {
inputTypes = new Type [2] {typeof (System.IO.Stream), typeof (System.Xml.XmlDocument)};
}
}
return inputTypes;
}
}
public override Type[] OutputTypes {
get {
if (outputTypes == null) {
lock (lockObject) {
outputTypes = new Type [1] {typeof (System.Xml.XmlDocument)};
}
}
return outputTypes;
}
}
#endregion // Properties
#region Methods
public void AddExceptUri (string uri)
{
exceptUris.Add (uri);
}
private void ClearExceptUris ()
{
exceptUris.Clear ();
}
[MonoTODO ("Verify")]
protected override XmlNodeList GetInnerXml ()
{
XmlDocument doc = new XmlDocument ();
doc.AppendChild (doc.CreateElement ("DecryptionTransform"));
foreach (object o in exceptUris) {
XmlElement element = doc.CreateElement ("Except", NamespaceUri);
element.Attributes.Append (doc.CreateAttribute ("URI", NamespaceUri));
element.Attributes ["URI", NamespaceUri].Value = (string) o;
doc.DocumentElement.AppendChild (element);
}
return doc.GetElementsByTagName ("Except", NamespaceUri);
}
[MonoTODO ("Verify processing of ExceptURIs")]
public override object GetOutput ()
{
XmlDocument document;
if (inputObj is Stream) {
document = new XmlDocument ();
document.PreserveWhitespace = true;
document.XmlResolver = GetResolver ();
document.Load (new XmlSignatureStreamReader (
new StreamReader (inputObj as Stream)));
}
else if (inputObj is XmlDocument) {
document = inputObj as XmlDocument;
}
else
throw new NullReferenceException ();
XmlNodeList nodes = document.GetElementsByTagName ("EncryptedData", EncryptedXml.XmlEncNamespaceUrl);
foreach (XmlNode node in nodes) {
if (node == document.DocumentElement && exceptUris.Contains ("#xpointer(/)"))
break;
// Need to exclude based on ExceptURI. Only accept #id references.
foreach (string uri in exceptUris)
if (IsTargetElement ((XmlElement) node, uri.Substring (1)))
break;
EncryptedData encryptedData = new EncryptedData ();
encryptedData.LoadXml ((XmlElement) node);
SymmetricAlgorithm symAlg = EncryptedXml.GetDecryptionKey (encryptedData, encryptedData.EncryptionMethod.KeyAlgorithm);
EncryptedXml.ReplaceData ((XmlElement) node, EncryptedXml.DecryptData (encryptedData, symAlg));
}
return document;
}
public override object GetOutput (Type type)
{
if (type == Type.GetType ("Stream"))
return GetOutput ();
throw new ArgumentException ("type");
}
[MonoTODO ("verify")]
protected virtual bool IsTargetElement (XmlElement inputElement, string idValue)
{
return (inputElement.Attributes ["id"].Value == idValue);
}
[MonoTODO ("This doesn't seem to work in .NET")]
public override void LoadInnerXml (XmlNodeList nodeList)
{
if (nodeList == null)
throw new NullReferenceException ();
ClearExceptUris ();
foreach (XmlNode node in nodeList) {
XmlElement element = node as XmlElement;
if (element.NamespaceURI.Equals (NamespaceUri) && element.LocalName.Equals ("Except")) {
string uri = element.Attributes ["URI", NamespaceUri].Value;
if (!uri.StartsWith ("#"))
throw new CryptographicException ("A Uri attribute is required for a CipherReference element.");
AddExceptUri (uri);
}
}
}
public override void LoadInput (object obj)
{
inputObj = obj;
}
#endregion // Methods
}
}
#endif
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