mcs/class/System.Security/System.Security.Cryptography.Xml/Transform.cs

   1 //
   2 // Transform.cs - Transform implementation for XML Signature
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //      Atsushi Enomoto <atsushi@ximian.com>
   7 //      Tim Coleman <tim@timcoleman.com>
   8 //
   9 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
  10 // Copyright (C) Tim Coleman, 2004
  11 // Copyright (C) 2004-2006 Novell Inc. (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Collections;
  34 using System.IO;
  35 using System.Runtime.InteropServices;
  36 using System.Security;
  37 using System.Security.Policy;
  38 using System.Xml;
  39
  40 namespace System.Security.Cryptography.Xml {
  41
  42         public abstract class Transform {
  43
  44                 private string algo;
  45                 private XmlResolver xmlResolver;
  46                 private Hashtable propagated_namespaces = new Hashtable ();
  47
  48                 protected Transform ()
  49                 {
  50                         if (SecurityManager.SecurityEnabled) {
  51                                 xmlResolver = new XmlSecureResolver (new XmlUrlResolver (), (Evidence) new Evidence ());
  52                         } else {
  53                                 xmlResolver = new XmlUrlResolver ();
  54                         }
  55                 }
  56
  57                 #region Properties
  58
  59                 public string Algorithm {
  60                         get { return algo; }
  61                         set { algo = value; }
  62                 }
  63
  64                 public abstract Type[] InputTypes {
  65                         get;
  66                 }
  67
  68                 public abstract Type[] OutputTypes {
  69                         get;
  70                 }
  71
  72                 [ComVisible(false)]
  73                 public XmlResolver Resolver {
  74                         set { xmlResolver = value; }
  75                 }
  76
  77                 [MonoTODO]
  78                 [ComVisible (false)]
  79                 public XmlElement Context {
  80                         get { throw new NotImplementedException (); }
  81                         set { throw new NotImplementedException (); }
  82                 }
  83
  84                 [ComVisible (false)]
  85                 public Hashtable PropagatedNamespaces {
  86                         get { return propagated_namespaces; }
  87                 }
  88
  89                 #endregion // Properties
  90
  91                 #region Methods
  92                 [ComVisible (false)]
  93                 public virtual byte[] GetDigestedOutput (HashAlgorithm hash)
  94                 {
  95                         // no null check, MS throws a NullReferenceException here
  96                         return hash.ComputeHash ((Stream) GetOutput (typeof (Stream)));
  97                 }
  98
  99                 protected abstract XmlNodeList GetInnerXml ();
 100
 101                 public abstract object GetOutput ();
 102
 103                 public abstract object GetOutput (Type type);
 104
 105                 public XmlElement GetXml ()
 106                 {
 107                         XmlDocument document = new XmlDocument ();
 108                         document.XmlResolver = GetResolver ();
 109                         XmlElement xel = document.CreateElement (XmlSignature.ElementNames.Transform, XmlSignature.NamespaceURI);
 110                         xel.SetAttribute (XmlSignature.AttributeNames.Algorithm, algo);
 111                         XmlNodeList xnl = this.GetInnerXml ();
 112                         if (xnl != null) {
 113                                 foreach (XmlNode xn in xnl) {
 114                                         XmlNode importedNode = document.ImportNode (xn, true);
 115                                         xel.AppendChild (importedNode);
 116                                 }
 117                         }
 118                         return xel;
 119                 }
 120
 121                 public abstract void LoadInnerXml (XmlNodeList nodeList);
 122
 123                 public abstract void LoadInput (object obj);
 124
 125                 internal XmlResolver GetResolver ()
 126                 {
 127                         return xmlResolver;
 128                 }
 129
 130                 #endregion // Methods
 131         }
 132 }