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