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//
// EncryptionMethod.cs - EncryptionMethod implementation for XML Encryption
// http://www.w3.org/2001/04/xmlenc#sec-EncryptionMethod
//
// 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 class EncryptionMethod {
#region Fields
string algorithm;
int keySize;
#endregion // Fields
#region Constructors
public EncryptionMethod ()
{
KeyAlgorithm = null;
}
public EncryptionMethod (string strAlgorithm)
{
KeyAlgorithm = strAlgorithm;
}
#endregion // Constructors
#region Properties
public string KeyAlgorithm {
get { return algorithm; }
set { algorithm = value; }
}
public int KeySize {
get { return keySize; }
set {
if (value <= 0)
throw new ArgumentOutOfRangeException ("The key size should be a non negative integer.");
keySize = value;
}
}
#endregion // Properties
#region Methods
public XmlElement GetXml ()
{
return GetXml (new XmlDocument ());
}
internal XmlElement GetXml (XmlDocument document)
{
XmlElement xel = document.CreateElement (XmlEncryption.ElementNames.EncryptionMethod, EncryptedXml.XmlEncNamespaceUrl);
if (KeySize != 0) {
XmlElement xks = document.CreateElement (XmlEncryption.ElementNames.KeySize, EncryptedXml.XmlEncNamespaceUrl);
xks.InnerText = String.Format ("{0}", keySize);
xel.AppendChild (xks);
}
if (KeyAlgorithm != null)
xel.SetAttribute (XmlEncryption.AttributeNames.Algorithm, KeyAlgorithm);
return xel;
}
public void LoadXml (XmlElement value)
{
if (value == null)
throw new ArgumentNullException ("value");
if ((value.LocalName != XmlEncryption.ElementNames.EncryptionMethod) || (value.NamespaceURI != EncryptedXml.XmlEncNamespaceUrl))
throw new CryptographicException ("Malformed EncryptionMethod element.");
else {
KeyAlgorithm = null;
foreach (XmlNode n in value.ChildNodes) {
if (n is XmlWhitespace)
continue;
switch (n.LocalName) {
case XmlEncryption.ElementNames.KeySize:
KeySize = Int32.Parse (n.InnerText);
break;
}
}
if (value.HasAttribute (XmlEncryption.AttributeNames.Algorithm))
KeyAlgorithm = value.Attributes [XmlEncryption.AttributeNames.Algorithm].Value;
}
}
#endregion // Methods
}
}
#endif
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