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

   1 //
   2 // CipherReference.cs - CipherReference implementation for XML Encryption
   3 // http://www.w3.org/2001/04/xmlenc#sec-CipherReference
   4 //
   5 // Author:
   6 //      Tim Coleman (tim@timcoleman.com)
   7 //
   8 // Copyright (C) Tim Coleman, 2004
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 #if NET_2_0
  32
  33 using System.Xml;
  34
  35 namespace System.Security.Cryptography.Xml {
  36         public sealed class CipherReference : EncryptedReference {
  37
  38                 #region Constructors
  39
  40                 public CipherReference ()
  41                         : base ()
  42                 {
  43                 }
  44
  45                 public CipherReference (string uri)
  46                         : base (uri)
  47                 {
  48                 }
  49
  50                 public CipherReference (string uri, TransformChain tc)
  51                         : base (uri, tc)
  52                 {
  53                 }
  54
  55                 #endregion // Constructors
  56
  57                 #region Methods
  58
  59                 public override XmlElement GetXml ()
  60                 {
  61                         return GetXml (new XmlDocument ());
  62                 }
  63
  64                 internal override XmlElement GetXml (XmlDocument document)
  65                 {
  66                         XmlElement xel = document.CreateElement (XmlEncryption.ElementNames.CipherReference, EncryptedXml.XmlEncNamespaceUrl);
  67
  68                         xel.SetAttribute (XmlEncryption.AttributeNames.URI, Uri);
  69
  70                         if (TransformChain != null && TransformChain.Count > 0) {
  71                                 XmlElement xtr = document.CreateElement (XmlEncryption.ElementNames.Transforms, EncryptedXml.XmlEncNamespaceUrl);
  72                                 foreach (Transform t in TransformChain)
  73                                         xtr.AppendChild (document.ImportNode (t.GetXml (), true));
  74                                 xel.AppendChild (xtr);
  75                         }
  76
  77                         return xel;
  78                 }
  79
  80                 public override void LoadXml (XmlElement value)
  81                 {
  82                         if (value == null)
  83                                 throw new ArgumentNullException ("value");
  84                         if ((value.LocalName != XmlEncryption.ElementNames.CipherReference) || (value.NamespaceURI != EncryptedXml.XmlEncNamespaceUrl))
  85                                 throw new CryptographicException ("Malformed CipherReference element.");
  86                         else {
  87                                 Uri = null;
  88                                 TransformChain = new TransformChain ();
  89
  90                                 foreach (XmlNode n in value.ChildNodes) {
  91                                         if (n is XmlWhitespace)
  92                                                 continue;
  93
  94                                         switch (n.LocalName) {
  95                                         case XmlEncryption.ElementNames.Transforms:
  96                                                 foreach (XmlNode xn in ((XmlElement) n).GetElementsByTagName (XmlSignature.ElementNames.Transform, XmlSignature.NamespaceURI)) {
  97                                                         Transform t = null;
  98                                                         switch (((XmlElement) xn).Attributes [XmlSignature.AttributeNames.Algorithm].Value) {
  99                                                         case XmlSignature.AlgorithmNamespaces.XmlDsigBase64Transform:
 100                                                                 t = new XmlDsigBase64Transform ();
 101                                                                 break;
 102                                                         case XmlSignature.AlgorithmNamespaces.XmlDsigC14NTransform:
 103                                                                 t = new XmlDsigC14NTransform ();
 104                                                                 break;
 105                                                         case XmlSignature.AlgorithmNamespaces.XmlDsigC14NWithCommentsTransform:
 106                                                                 t = new XmlDsigC14NWithCommentsTransform ();
 107                                                                 break;
 108                                                         case XmlSignature.AlgorithmNamespaces.XmlDsigEnvelopedSignatureTransform:
 109                                                                 t = new XmlDsigEnvelopedSignatureTransform ();
 110                                                                 break;
 111                                                         case XmlSignature.AlgorithmNamespaces.XmlDsigXPathTransform:
 112                                                                 t = new XmlDsigXPathTransform ();
 113                                                                 break;
 114                                                         case XmlSignature.AlgorithmNamespaces.XmlDsigXsltTransform:
 115                                                                 t = new XmlDsigXsltTransform ();
 116                                                                 break;
 117 #if NET_2_0
 118                                                         case XmlSignature.AlgorithmNamespaces.XmlDecryptionTransform:
 119                                                                 t = new XmlDecryptionTransform ();
 120                                                                 break;
 121 #endif
 122                                                         default:
 123                                                                 continue;
 124                                                         }
 125
 126                                                         t.LoadInnerXml (((XmlElement) xn).ChildNodes);
 127                                                         TransformChain.Add (t);
 128                                                 }
 129                                                 break;
 130                                         }
 131                                 }
 132
 133                                 if (value.HasAttribute (XmlEncryption.AttributeNames.URI))
 134                                         Uri = value.Attributes [XmlEncryption.AttributeNames.URI].Value;
 135                         }
 136                 }
 137
 138                 #endregion // Methods
 139         }
 140 }
 141
 142 #endif