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 // (C) 2004 Novell (http://www.novell.com)
  14 //
  15
  16 //
  17 // Permission is hereby granted, free of charge, to any person obtaining
  18 // a copy of this software and associated documentation files (the
  19 // "Software"), to deal in the Software without restriction, including
  20 // without limitation the rights to use, copy, modify, merge, publish,
  21 // distribute, sublicense, and/or sell copies of the Software, and to
  22 // permit persons to whom the Software is furnished to do so, subject to
  23 // the following conditions:
  24 //
  25 // The above copyright notice and this permission notice shall be
  26 // included in all copies or substantial portions of the Software.
  27 //
  28 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  32 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  33 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  34 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  35 //
  36
  37 using System.Collections;
  38 using System.IO;
  39 using System.Text;
  40 using System.Xml;
  41
  42 using Mono.Xml;
  43
  44 namespace System.Security.Cryptography.Xml {
  45
  46         public class XmlDsigC14NTransform : Transform {
  47                 private Type[] input;
  48                 private Type[] output;
  49                 private XmlCanonicalizer canonicalizer;
  50                 private Stream s;
  51
  52                 public XmlDsigC14NTransform ()
  53                 {
  54                         Algorithm = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315";
  55                         canonicalizer = new XmlCanonicalizer (false, false);
  56                 }
  57
  58                 public XmlDsigC14NTransform (bool includeComments)
  59                 {
  60                         canonicalizer = new XmlCanonicalizer (includeComments, false);
  61                 }
  62
  63                 public override Type[] InputTypes {
  64                         get {
  65                                 if (input == null) {
  66                                         lock (this) {
  67                                                 // this way the result is cached if called multiple time
  68                                                 input = new Type [3];
  69                                                 input[0] = typeof (System.IO.Stream);
  70                                                 input[1] = typeof (System.Xml.XmlDocument);
  71                                                 input[2] = typeof (System.Xml.XmlNodeList);
  72                                         }
  73                                 }
  74                                 return input;
  75                         }
  76                 }
  77
  78                 public override Type[] OutputTypes {
  79                         get {
  80                                 if (output == null) {
  81                                         lock (this) {
  82                                                 // this way the result is cached if called multiple time
  83                                                 output = new Type [1];
  84                                                 output[0] = typeof (System.IO.Stream);
  85                                         }
  86                                 }
  87                                 return output;
  88                         }
  89                 }
  90
  91                 protected override XmlNodeList GetInnerXml ()
  92                 {
  93                         return null; // THIS IS DOCUMENTED AS SUCH
  94                 }
  95
  96 #if NET_2_0
  97                 [MonoTODO]
  98                 public override byte[] GetDigestedOutput (HashAlgorithm hash)
  99                 {
 100                         throw new NotImplementedException ();
 101                 }
 102 #endif
 103
 104                 public override object GetOutput ()
 105                 {
 106                         return (object) s;
 107                 }
 108
 109                 public override object GetOutput (Type type)
 110                 {
 111                         if (type == Type.GetType ("Stream"))
 112                                 return GetOutput ();
 113                         throw new ArgumentException ("type");
 114                 }
 115
 116                 public override void LoadInnerXml (XmlNodeList nodeList)
 117                 {
 118                         // documented as not changing the state of the transform
 119                 }
 120
 121                 public override void LoadInput (object obj)
 122                 {
 123                         if (obj is Stream) {
 124                                 s = (obj as Stream);
 125                                 XmlDocument doc = new XmlDocument ();
 126                                 doc.PreserveWhitespace = true;  // REALLY IMPORTANT
 127                                 doc.Load (obj as Stream);
 128                                 s = canonicalizer.Canonicalize (doc);
 129                         } else if (obj is XmlDocument)
 130                                 s = canonicalizer.Canonicalize ((obj as XmlDocument));
 131                         else if (obj is XmlNodeList)
 132                                 s = canonicalizer.Canonicalize ((obj as XmlNodeList));
 133                         // note: there is no default are other types won't throw an exception
 134                 }
 135         }
 136 }
 137