class/System.Security/System.Security.Cryptography.Xml/XmlDsigBase64Transform.cs

   1 //
   2 // XmlDsigBase64Transform.cs - Base64 Transform implementation for XML Signature
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //
   7 // (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
   8 // (C) 2004 Novell (http://www.novell.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.IO;
  33 using System.Security.Cryptography;
  34 using System.Text;
  35 using System.Xml;
  36
  37 namespace System.Security.Cryptography.Xml {
  38
  39         // http://www.w3.org/2000/09/xmldsig#base64
  40         public class XmlDsigBase64Transform : Transform {
  41
  42                 private CryptoStream cs;
  43                 private Type[] input;
  44                 private Type[] output;
  45
  46                 public XmlDsigBase64Transform ()
  47                 {
  48                         Algorithm = XmlSignature.AlgorithmNamespaces.XmlDsigBase64Transform;
  49                 }
  50
  51                 public override Type[] InputTypes {
  52                         get {
  53                                 if (input == null) {
  54                                         input = new Type [3];
  55                                         input[0] = typeof (System.IO.Stream);
  56                                         input[1] = typeof (System.Xml.XmlDocument);
  57                                         input[2] = typeof (System.Xml.XmlNodeList);
  58                                 }
  59                                 return input;
  60                         }
  61                 }
  62
  63                 public override Type[] OutputTypes {
  64                         get {
  65                                 if (output == null) {
  66                                         output = new Type [1];
  67                                         output[0] = typeof (System.IO.Stream);
  68                                 }
  69                                 return output;
  70                         }
  71                 }
  72
  73                 protected override XmlNodeList GetInnerXml ()
  74                 {
  75                         return null; // THIS IS DOCUMENTED AS SUCH
  76                 }
  77
  78                 public override object GetOutput ()
  79                 {
  80                         return (object) cs;
  81                 }
  82
  83                 public override object GetOutput (Type type)
  84                 {
  85                         if (type != typeof (System.IO.Stream))
  86                                 throw new ArgumentException ("type");
  87                         return GetOutput ();
  88                 }
  89
  90                 public override void LoadInnerXml (XmlNodeList nodeList)
  91                 {
  92                         // documented as not changing the state of the transform
  93                 }
  94
  95                 public override void LoadInput (object obj)
  96                 {
  97                         XmlNodeList xnl = null;
  98                         Stream stream = null;
  99
 100                         if (obj is Stream)
 101                                 stream = (obj as Stream);
 102                         else if (obj is XmlDocument)
 103                                 xnl = (obj as XmlDocument).SelectNodes ("//.");
 104                         else if (obj is XmlNodeList)
 105                                 xnl = (XmlNodeList) obj;
 106
 107                         if (xnl != null) {
 108                                 stream = new MemoryStream ();
 109                                 StreamWriter sw = new StreamWriter (stream);
 110                                 foreach (XmlNode xn in xnl) {
 111                                         switch (xn.NodeType) {
 112                                         case XmlNodeType.Attribute:
 113                                         case XmlNodeType.Text:
 114                                         case XmlNodeType.CDATA:
 115                                         case XmlNodeType.SignificantWhitespace:
 116                                         case XmlNodeType.Whitespace:
 117                                                 sw.Write (xn.Value);
 118                                                 break;
 119                                         }
 120                                 }
 121                                 sw.Flush ();
 122                                 // ready to be re-used
 123                                 stream.Position = 0;
 124                         }
 125
 126                         if (stream != null)
 127                                 cs = new CryptoStream (stream, new FromBase64Transform (), CryptoStreamMode.Read);
 128                         // note: there is no default are other types won't throw an exception
 129                 }
 130         }
 131 }