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

//
// EncryptedReference.cs - EncryptedReference implementation for XML Encryption
// http://www.w3.org/2001/04/xmlenc#sec-EncryptedReference
//
// 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.Xml;

namespace System.Security.Cryptography.Xml{
  public abstract class EncryptedReference {

    #region Fields

    bool cacheValid;
    string referenceType;
    string uri;
    TransformChain tc;

    #endregion // Fields

    #region Constructors

    protected EncryptedReference ()
    {
      TransformChain = new TransformChain ();
    }
  
    protected EncryptedReference (string uri)
    {
      Uri = uri;
      TransformChain = new TransformChain ();
    }
  
    protected EncryptedReference (string uri, TransformChain tc)
      : this ()
    {
      Uri = uri;
      TransformChain = tc;
    }
  
    #endregion // Constructors

    #region Properties

    [MonoTODO()]
    protected internal bool CacheValid {
      get { return cacheValid; }
    }

    protected string ReferenceType {
      get { return referenceType; }
      set { referenceType = value; }
    }

    public TransformChain TransformChain {
      get { return tc; }
      set { tc = value; }
    }

    public string Uri {
      get { return uri; }
      set { uri = value; }
    }

    #endregion // Properties
  
    #region Methods

    public void AddTransform (Transform transform)
    {
      TransformChain.Add (transform);
    }

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

    internal virtual XmlElement GetXml (XmlDocument document)
    {
      XmlElement xel = document.CreateElement (ReferenceType, EncryptedXml.XmlEncNamespaceUrl);

      xel.SetAttribute (XmlEncryption.AttributeNames.URI, Uri);

                        if (TransformChain != null && TransformChain.Count > 0) {
                                XmlElement xtr = document.CreateElement (XmlEncryption.ElementNames.Transforms, EncryptedXml.XmlEncNamespaceUrl);
                                foreach (Transform t in TransformChain)
                                        xtr.AppendChild (document.ImportNode (t.GetXml (), true));
                                xel.AppendChild (xtr);
                        }

      return xel;
    }

    [MonoTODO ("Make compliant.")]
    public virtual void LoadXml (XmlElement value)
    {
      if (value == null)
        throw new ArgumentNullException ("value");
      else {
        Uri = null;
        TransformChain = new TransformChain ();

        foreach (XmlNode n in value.ChildNodes) {
          if (n is XmlWhitespace)
            continue;

          switch (n.LocalName) {
          case XmlEncryption.ElementNames.Transforms:
            foreach (XmlNode xn in ((XmlElement) n).GetElementsByTagName (XmlSignature.ElementNames.Transform, XmlSignature.NamespaceURI)) {
              Transform t = null;
              switch (((XmlElement) xn).Attributes [XmlSignature.AttributeNames.Algorithm].Value) {
              case XmlSignature.AlgorithmNamespaces.XmlDsigBase64Transform:
                t = new XmlDsigBase64Transform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDsigC14NTransform:
                t = new XmlDsigC14NTransform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDsigC14NWithCommentsTransform:
                t = new XmlDsigC14NWithCommentsTransform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDsigEnvelopedSignatureTransform:
                t = new XmlDsigEnvelopedSignatureTransform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDsigXPathTransform:
                t = new XmlDsigXPathTransform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDsigXsltTransform:
                t = new XmlDsigXsltTransform ();
                break;
#if NET_2_0
              case XmlSignature.AlgorithmNamespaces.XmlDsigExcC14NTransform:
                t = new XmlDsigExcC14NTransform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDsigExcC14NWithCommentsTransform:
                t = new XmlDsigExcC14NWithCommentsTransform ();
                break;
              case XmlSignature.AlgorithmNamespaces.XmlDecryptionTransform:
                t = new XmlDecryptionTransform ();
                break;
#endif
              default:
                continue;
              }

              t.LoadInnerXml (((XmlElement) xn).ChildNodes);
              TransformChain.Add (t);
            }
            break;
          }
        }

        if (value.HasAttribute (XmlEncryption.AttributeNames.URI))
          Uri = value.Attributes [XmlEncryption.AttributeNames.URI].Value;
      }
    }

    #endregion // Methods
  }
}

#endif