File: WSSignedXml.cs

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//
// WSSignedXml.cs
//
// Author:
//	Atsushi Enomoto  <atsushi@ximian.com>
//
// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
//
// 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.
//
using System;
using System.Security.Cryptography.Xml;
using System.Xml;

namespace System.ServiceModel.Channels.Security
{
	// See http://blogs.msdn.com/shawnfa/archive/2004/04/05/108098.aspx :)
	class WSSignedXml : SignedXml
	{
		public WSSignedXml ()
		{
		}

		public WSSignedXml (XmlDocument doc)
			: base (doc)
		{
		}

		public override XmlElement GetIdElement (XmlDocument doc, string id)
		{
			return SearchChildren (doc, id);
		}

		XmlElement SearchChildren (XmlNode node, string id)
		{
			for (XmlNode n = node.FirstChild; n != null; n = n.NextSibling) {
				XmlElement el = n as XmlElement;
				if (el == null)
					continue;
				if (el.GetAttribute ("Id", Constants.WsuNamespace) == id || el.GetAttribute ("Id") == id)
					return el;
				XmlElement el2 = SearchChildren (el, id);
				if (el2 != null)
					return el2;
			}
			return null;
		}
	}
}