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//
// 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
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