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 #if NET_1_2
  11
  12 using System.Security.Cryptography;
  13 using System.IO;
  14 using System.Xml;
  15
  16 namespace System.Security.Cryptography.Xml {
  17         public sealed class CipherData {
  18
  19                 #region Fields
  20
  21                 byte[] cipherValue;
  22                 CipherReference cipherReference;
  23
  24                 #endregion // Fields
  25
  26                 #region Constructors
  27
  28                 public CipherData ()
  29                 {
  30                 }
  31
  32                 public CipherData (byte[] cipherValue)
  33                 {
  34                         CipherValue = cipherValue;
  35                 }
  36
  37                 public CipherData (CipherReference cipherReference)
  38                 {
  39                         CipherReference = cipherReference;
  40                 }
  41
  42                 #endregion // Constructors
  43
  44                 #region Properties
  45
  46                 public CipherReference CipherReference {
  47                         get { return cipherReference; }
  48                         set {
  49                                 if (CipherValue != null)
  50                                         throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
  51                                 cipherReference = value;
  52                         }
  53                 }
  54
  55                 public byte[] CipherValue {
  56                         get { return cipherValue; }
  57                         set {
  58                                 if (CipherReference != null)
  59                                         throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
  60                                 cipherValue = value;
  61                         }
  62                 }
  63
  64                 #endregion // Properties
  65
  66                 #region Methods
  67
  68                 public XmlElement GetXml ()
  69                 {
  70                         return GetXml (new XmlDocument ());
  71                 }
  72
  73                 internal XmlElement GetXml (XmlDocument document)
  74                 {
  75                         if (CipherReference == null && CipherValue == null)
  76                                 throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
  77
  78                         XmlElement xel = document.CreateElement (XmlEncryption.ElementNames.CipherData, XmlEncryption.NamespaceURI);
  79                         if (CipherReference != null)
  80                                 xel.AppendChild (document.ImportNode (cipherReference.GetXml (), true));
  81
  82                         if (CipherValue != null) {
  83                                 XmlElement xcv = document.CreateElement (XmlEncryption.ElementNames.CipherValue, XmlEncryption.NamespaceURI);
  84                                 StreamReader reader = new StreamReader (new CryptoStream (new MemoryStream (cipherValue), new ToBase64Transform (), CryptoStreamMode.Read));
  85                                 xcv.InnerText = reader.ReadToEnd ();
  86                                 reader.Close ();
  87                                 xel.AppendChild (xcv);
  88                         }
  89                         return xel;
  90                 }
  91
  92                 public void LoadXml (XmlElement value)
  93                 {
  94                         CipherReference = null;
  95                         CipherValue = null;
  96
  97                         if (value == null)
  98                                 throw new ArgumentNullException ("value");
  99
 100                         if ((value.LocalName != XmlEncryption.ElementNames.CipherData) || (value.NamespaceURI != XmlEncryption.NamespaceURI))
 101                                 throw new CryptographicException ("Malformed Cipher Data element.");
 102                         else {
 103                                 foreach (XmlNode n in value.ChildNodes) {
 104                                         if (n is XmlWhitespace)
 105                                                 continue;
 106
 107                                         switch (n.LocalName) {
 108                                         case XmlEncryption.ElementNames.CipherReference:
 109                                                 cipherReference = new CipherReference ();
 110                                                 cipherReference.LoadXml ((XmlElement) n);
 111                                                 break;
 112                                         case XmlEncryption.ElementNames.CipherValue:
 113                                                 CipherValue = Convert.FromBase64String (n.InnerText);
 114                                                 break;
 115                                         }
 116                                 }
 117
 118                                 if (CipherReference == null && CipherValue == null)
 119                                         throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
 120                         }
 121                 }
 122
 123                 #endregion // Methods
 124         }
 125 }
 126
 127 #endif