Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Packaging / CustomSignedXml.cs / 1305600 / CustomSignedXml.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Wrapper class for existing SignedXml class that works around // DevDiv Schedule bug: 39530 (mdownen PM) // // History: // 07/08/2005: BruceMac: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.Xml; using System.Windows; // for SR using System.Security.Cryptography.Xml; using MS.Internal.WindowsBase; namespace MS.Internal.IO.Packaging { ////// SignedXml wrapper that supports reference targeting of internal ID's /// ///See: http://www.w3.org/TR/2002/REC-xmldsig-core-20020212/ for details internal class CustomSignedXml : SignedXml { ////// Returns the XmlElement that matches the given id /// /// /// ///element if found, otherwise return null public override XmlElement GetIdElement(XmlDocument document, string idValue) { // Always let the base class have a first try at finding the element XmlElement elem = base.GetIdElement(document, idValue); // If not found then we will try to find it ourselves if (elem == null) { elem = SelectNodeByIdFromObjects(m_signature, idValue); } return elem; } ////// Locate and return the node identified by idValue /// /// /// ///node if found - else null ///Tries to match each object in the Object list. private static XmlElement SelectNodeByIdFromObjects(Signature signature, string idValue) { XmlElement node = null; // enumerate the objects foreach (DataObject dataObject in signature.ObjectList) { // direct reference to Object id - supported for all reference typs if (String.CompareOrdinal(idValue, dataObject.Id) == 0) { // anticipate duplicate ID's and throw if any found if (node != null) throw new XmlException(SR.Get(SRID.DuplicateObjectId)); node = dataObject.GetXml(); } } // now search for XAdES specific references if (node == null) { // For XAdES we implement special case where the reference may // be to an internal tag with matching "Id" attribute. node = SelectSubObjectNodeForXAdES(signature, idValue); } return node; } ////// Locate any signed Object tag that matches the XAdES "target type" /// /// /// ///element if found; null if not found ///Special purpose code to support Sub-Object signing required by XAdES signatures private static XmlElement SelectSubObjectNodeForXAdES(Signature signature, string idValue) { XmlElement node = null; // enumerate the References to determine if any are of type XAdES foreach (Reference reference in signature.SignedInfo.References) { // if we get a match by Type? if (String.CompareOrdinal(reference.Type, _XAdESTargetType) == 0) { // now try to match by Uri // strip off any preceding # mark to facilitate matching string uri; if ((reference.Uri.Length > 0) && (reference.Uri[0] == '#')) uri = reference.Uri.Substring(1); else continue; // ignore non-local references // if we have a XAdES type reference and the ID matches the requested one // search all object tags for the XML with this ID if (String.CompareOrdinal(uri, idValue) == 0) { node = SelectSubObjectNodeForXAdESInDataObjects(signature, idValue); break; } } } return node; } ////// Locates and selects the target XmlElement from all available Object tags /// /// /// ///element if found; null if not found ///relies on XPath query to search the Xml in each Object tag private static XmlElement SelectSubObjectNodeForXAdESInDataObjects(Signature signature, string idValue) { XmlElement node = null; // now find an object tag that includes an element that matches foreach (DataObject dataObject in signature.ObjectList) { // skip the package object if (String.CompareOrdinal(dataObject.Id, XTable.Get(XTable.ID.OpcAttrValue)) != 0) { XmlElement element = dataObject.GetXml(); // NOTE: this is executing an XPath query XmlElement local = element.SelectSingleNode("//*[@Id='" + idValue + "']") as XmlElement; if (local == null) continue; // node found? if (local != null) { XmlNode temp = local; // climb the tree towards the root until we find our namespace while ((temp != null) && (temp.NamespaceURI.Length == 0)) temp = temp.ParentNode; // only match if the target is in the XAdES namespace if ((temp != null) && (String.CompareOrdinal(temp.NamespaceURI, _XAdESNameSpace) == 0)) { node = local as XmlElement; break; } } } } return node; } private const string _XAdESNameSpace = @"http://uri.etsi.org/01903/v1.2.2#"; private const string _XAdESTargetType = _XAdESNameSpace + @"SignedProperties"; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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