CipherData.cs :  » 2.6.4-mono-.net-core » System.Security » System » Security » Cryptography » Xml » C# / CSharp Open Source

//
// CipherData.cs - CipherData implementation for XML Encryption
// http://www.w3.org/2001/04/xmlenc#sec-CipherData
//
// Author:
//      Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2004

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#if NET_2_0

using System.Security.Cryptography;
using System.IO;
using System.Xml;

namespace System.Security.Cryptography.Xml{
  public sealed class CipherData {

    #region Fields

    byte[] cipherValue;
    CipherReference cipherReference;
  
    #endregion // Fields
  
    #region Constructors
  
    public CipherData ()
    {
    }
  
    public CipherData (byte[] cipherValue)
    {
      CipherValue = cipherValue;
    }
  
    public CipherData (CipherReference cipherReference)
    {
      CipherReference = cipherReference;
    }
  
    #endregion // Constructors
  
    #region Properties
  
    public CipherReference CipherReference {
      get { return cipherReference; }
      set { 
        if (CipherValue != null)
          throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
        cipherReference = value;
      }
    }
  
    public byte[] CipherValue {
      get { return cipherValue; }
      set {
        if (CipherReference != null)
          throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
        cipherValue = value;
      }
    }

    #endregion // Properties

    #region Methods

    public XmlElement GetXml ()
    {
      return GetXml (new XmlDocument ());
    }

    internal XmlElement GetXml (XmlDocument document)
    {
      if (CipherReference == null && CipherValue == null)
        throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");

      XmlElement xel = document.CreateElement (XmlEncryption.ElementNames.CipherData, EncryptedXml.XmlEncNamespaceUrl);
      if (CipherReference != null) 
        xel.AppendChild (document.ImportNode (cipherReference.GetXml (), true));

      if (CipherValue != null) {
        XmlElement xcv = document.CreateElement (XmlEncryption.ElementNames.CipherValue, EncryptedXml.XmlEncNamespaceUrl);
        StreamReader reader = new StreamReader (new CryptoStream (new MemoryStream (cipherValue), new ToBase64Transform (), CryptoStreamMode.Read));
        xcv.InnerText = reader.ReadToEnd ();
        reader.Close ();
        xel.AppendChild (xcv);
      }
      return xel;
    }

    public void LoadXml (XmlElement value)
    {
      CipherReference = null;
      CipherValue = null;

      if (value == null)
        throw new ArgumentNullException ("value");

      if ((value.LocalName != XmlEncryption.ElementNames.CipherData) || (value.NamespaceURI != EncryptedXml.XmlEncNamespaceUrl)) 
        throw new CryptographicException ("Malformed Cipher Data element.");
      else {
        foreach (XmlNode n in value.ChildNodes) {
          if (n is XmlWhitespace)
            continue;

          switch (n.LocalName) {
          case XmlEncryption.ElementNames.CipherReference:
            cipherReference = new CipherReference ();
            cipherReference.LoadXml ((XmlElement) n);
            break;
          case XmlEncryption.ElementNames.CipherValue:
            CipherValue = Convert.FromBase64String (n.InnerText);
            break;
          }
        }

        if (CipherReference == null && CipherValue == null)
          throw new CryptographicException ("A Cipher Data element should have either a CipherValue or a CipherReference element.");
      }
    }

    #endregion // Methods
  }
}

#endif