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

   1 //
   2 // CipherData.cs - CipherData implementation for XML Encryption
   3 // http://www.w3.org/2001/04/xmlenc#sec-CipherData
   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.Security.Cryptography;
  34 using System.IO;
  35 using System.Xml;
  36
  37 namespace System.Security.Cryptography.Xml {
  38         public sealed class CipherData {
  39
  40                 #region Fields
  41
  42                 byte[] cipherValue;
  43                 CipherReference cipherReference;
  44
  45                 #endregion // Fields
  46
  47                 #region Constructors
  48
  49                 public CipherData ()
  50                 {
  51                 }
  52
  53                 public CipherData (byte[] cipherValue)
  54                 {
  55                         CipherValue = cipherValue;
  56                 }
  57
  58                 public CipherData (CipherReference cipherReference)
  59                 {
  60                         CipherReference = cipherReference;
  61                 }
  62
  63                 #endregion // Constructors
  64
  65                 #region Properties
  66
  67                 public CipherReference CipherReference {
  68                         get { return cipherReference; }
  69                         set {
  70                                 if (CipherValue != null)
  71                                         throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
  72                                 cipherReference = value;
  73                         }
  74                 }
  75
  76                 public byte[] CipherValue {
  77                         get { return cipherValue; }
  78                         set {
  79                                 if (CipherReference != null)
  80                                         throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
  81                                 cipherValue = value;
  82                         }
  83                 }
  84
  85                 #endregion // Properties
  86
  87                 #region Methods
  88
  89                 public XmlElement GetXml ()
  90                 {
  91                         return GetXml (new XmlDocument ());
  92                 }
  93
  94                 internal XmlElement GetXml (XmlDocument document)
  95                 {
  96                         if (CipherReference == null && CipherValue == null)
  97                                 throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
  98
  99                         XmlElement xel = document.CreateElement (XmlEncryption.ElementNames.CipherData, EncryptedXml.XmlEncNamespaceUrl);
 100                         if (CipherReference != null)
 101                                 xel.AppendChild (document.ImportNode (cipherReference.GetXml (), true));
 102
 103                         if (CipherValue != null) {
 104                                 XmlElement xcv = document.CreateElement (XmlEncryption.ElementNames.CipherValue, EncryptedXml.XmlEncNamespaceUrl);
 105                                 StreamReader reader = new StreamReader (new CryptoStream (new MemoryStream (cipherValue), new ToBase64Transform (), CryptoStreamMode.Read));
 106                                 xcv.InnerText = reader.ReadToEnd ();
 107                                 reader.Close ();
 108                                 xel.AppendChild (xcv);
 109                         }
 110                         return xel;
 111                 }
 112
 113                 public void LoadXml (XmlElement value)
 114                 {
 115                         CipherReference = null;
 116                         CipherValue = null;
 117
 118                         if (value == null)
 119                                 throw new ArgumentNullException ("value");
 120
 121                         if ((value.LocalName != XmlEncryption.ElementNames.CipherData) || (value.NamespaceURI != EncryptedXml.XmlEncNamespaceUrl))
 122                                 throw new CryptographicException ("Malformed Cipher Data element.");
 123                         else {
 124                                 foreach (XmlNode n in value.ChildNodes) {
 125                                         if (n is XmlWhitespace)
 126                                                 continue;
 127
 128                                         switch (n.LocalName) {
 129                                         case XmlEncryption.ElementNames.CipherReference:
 130                                                 cipherReference = new CipherReference ();
 131                                                 cipherReference.LoadXml ((XmlElement) n);
 132                                                 break;
 133                                         case XmlEncryption.ElementNames.CipherValue:
 134                                                 CipherValue = Convert.FromBase64String (n.InnerText);
 135                                                 break;
 136                                         }
 137                                 }
 138
 139                                 if (CipherReference == null && CipherValue == null)
 140                                         throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
 141                         }
 142                 }
 143
 144                 #endregion // Methods
 145         }
 146 }
 147
 148 #endif