mcs/class/System.Security/System.Security.Cryptography.Xml/XmlDsigC14NTransform.cs

   1 //
   2 // XmlDsigC14NTransform.cs - C14N Transform implementation for XML Signature
   3 // http://www.w3.org/TR/xml-c14n
   4 //
   5 // Authors:
   6 //      Sebastien Pouliot <sebastien@ximian.com>
   7 //      Aleksey Sanin (aleksey@aleksey.com)
   8 //      Tim Coleman (tim@timcoleman.com)
   9 //
  10 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
  11 // (C) 2003 Aleksey Sanin (aleksey@aleksey.com)
  12 // Copyright (C) Tim Coleman, 2004
  13 // Copyright (C) 2004-2005 Novell Inc. (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System.Collections;
  36 using System.IO;
  37 using System.Runtime.InteropServices;
  38 using System.Text;
  39 using System.Xml;
  40
  41 using Mono.Xml;
  42
  43 namespace System.Security.Cryptography.Xml {
  44
  45         public class XmlDsigC14NTransform : Transform {
  46                 private Type[] input;
  47                 private Type[] output;
  48                 private XmlCanonicalizer canonicalizer;
  49                 private Stream s;
  50
  51                 public XmlDsigC14NTransform () : this (false)
  52                 {
  53                 }
  54
  55                 public XmlDsigC14NTransform (bool includeComments)
  56                 {
  57                         if (includeComments)
  58                                 Algorithm = XmlSignature.AlgorithmNamespaces.XmlDsigC14NWithCommentsTransform;
  59                         else
  60                                 Algorithm = XmlSignature.AlgorithmNamespaces.XmlDsigC14NTransform;
  61                         canonicalizer = new XmlCanonicalizer (includeComments, false, PropagatedNamespaces);
  62                 }
  63
  64                 public override Type[] InputTypes {
  65                         get {
  66                                 if (input == null) {
  67                                         input = new Type [3];
  68                                         input[0] = typeof (System.IO.Stream);
  69                                         input[1] = typeof (System.Xml.XmlDocument);
  70                                         input[2] = typeof (System.Xml.XmlNodeList);
  71                                 }
  72                                 return input;
  73                         }
  74                 }
  75
  76                 public override Type[] OutputTypes {
  77                         get {
  78                                 if (output == null) {
  79                                         output = new Type [1];
  80                                         output[0] = typeof (System.IO.Stream);
  81                                 }
  82                                 return output;
  83                         }
  84                 }
  85
  86                 protected override XmlNodeList GetInnerXml ()
  87                 {
  88                         return null; // THIS IS DOCUMENTED AS SUCH
  89                 }
  90
  91 #if NET_2_0
  92                 [ComVisible (false)]
  93                 public override byte[] GetDigestedOutput (HashAlgorithm hash)
  94                 {
  95                         // no null check, MS throws a NullReferenceException here
  96                         return hash.ComputeHash ((Stream) GetOutput ());
  97                 }
  98 #endif
  99
 100                 public override object GetOutput ()
 101                 {
 102                         return (object) s;
 103                 }
 104
 105                 public override object GetOutput (Type type)
 106                 {
 107                         if (type == typeof (Stream))
 108                                 return GetOutput ();
 109                         throw new ArgumentException ("type");
 110                 }
 111
 112                 public override void LoadInnerXml (XmlNodeList nodeList)
 113                 {
 114                         // documented as not changing the state of the transform
 115                 }
 116
 117                 public override void LoadInput (object obj)
 118                 {
 119                         // possible input: Stream, XmlDocument, and XmlNodeList
 120                         Stream stream = (obj as Stream);
 121                         if (stream != null) {
 122                                 XmlDocument doc = new XmlDocument ();
 123                                 doc.PreserveWhitespace = true;  // REALLY IMPORTANT
 124                                 doc.XmlResolver = GetResolver ();
 125                                 doc.Load (new XmlSignatureStreamReader (new StreamReader (stream)));
 126 //                              doc.Load ((Stream) obj);
 127                                 s = canonicalizer.Canonicalize (doc);
 128                                 return;
 129                         }
 130
 131                         XmlDocument xd = (obj as XmlDocument);
 132                         if (xd != null) {
 133                                 s = canonicalizer.Canonicalize (xd);
 134                                 return;
 135                         }
 136
 137                         XmlNodeList nl = (obj as XmlNodeList);
 138                         if (nl != null) {
 139                                 s = canonicalizer.Canonicalize (nl);
 140                         }
 141 #if NET_2_0
 142                         else
 143                                 throw new ArgumentException ("obj");
 144 #else
 145                         // note: there is no default are other types won't throw an exception
 146 #endif
 147                 }
 148         }
 149 }
 150