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Basic formatting applied. Unnecessary comments have been removed. Suspicious code is covered by TODO.

Hcs.Client/Microsoft/Xades/SignaturePolicyIdentifier.cs

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+// SignaturePolicyIdentifier.cs
+//
+// XAdES Starter Kit for Microsoft .NET 3.5 (and above)
+// 2010 Microsoft France
+// Published under the CECILL-B Free Software license agreement.
+// (http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt)
+// 
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, 
+// WHETHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED 
+// WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. 
+// THE ENTIRE RISK OF USE OR RESULTS IN CONNECTION WITH THE USE OF THIS CODE 
+// AND INFORMATION REMAINS WITH THE USER.
+
+using System;
+using System.Security.Cryptography;
+using System.Xml;
+
+namespace Microsoft.Xades
+{
+    /// <summary>
+    /// This class contains an identifier of a signature policy
+    /// </summary>
+    public class SignaturePolicyIdentifier
+    {
+        #region Private variables
+        private SignaturePolicyId signaturePolicyId;
+        private bool signaturePolicyImplied;
+        #endregion
+
+        #region Public properties
+        /// <summary>
+        /// The SignaturePolicyId element is an explicit and unambiguous identifier
+        /// of a Signature Policy together with a hash value of the signature
+        /// policy, so it can be verified that the policy selected by the signer is
+        /// the one being used by the verifier. An explicit signature policy has a
+        /// globally unique reference, which, in this way, is bound to an
+        /// electronic signature by the signer as part of the signature
+        /// calculation.
+        /// </summary>
+        public SignaturePolicyId SignaturePolicyId
+        {
+            get
+            {
+                return this.signaturePolicyId;
+            }
+            set
+            {
+                this.signaturePolicyId = value;
+                this.signaturePolicyImplied = false;
+            }
+        }
+
+        /// <summary>
+        /// The empty SignaturePolicyImplied element will appear when the
+        /// data object(s) being signed and other external data imply the
+        /// signature policy
+        /// </summary>
+        public bool SignaturePolicyImplied
+        {
+            get
+            {
+                return this.signaturePolicyImplied;
+            }
+            set
+            {
+                this.signaturePolicyImplied = value;
+                if (this.signaturePolicyImplied == true)
+                {
+                    this.signaturePolicyId = null;
+                }
+            }
+        }
+        #endregion
+
+        #region Constructors
+        /// <summary>
+        /// Default constructor
+        /// </summary>
+        public SignaturePolicyIdentifier()
+        {
+            this.signaturePolicyId = new SignaturePolicyId();
+            this.signaturePolicyImplied = false;
+        }
+        #endregion
+
+        #region Public methods
+        /// <summary>
+        /// Check to see if something has changed in this instance and needs to be serialized
+        /// </summary>
+        /// <returns>Flag indicating if a member needs serialization</returns>
+        public bool HasChanged()
+        {
+            bool retVal = false;
+
+            if (this.signaturePolicyId != null && this.signaturePolicyId.HasChanged())
+            {
+                retVal = true;
+            }
+
+            if (this.signaturePolicyImplied)
+            {
+                retVal = true;
+            }
+
+            return retVal;
+        }
+
+        /// <summary>
+        /// Load state from an XML element
+        /// </summary>
+        /// <param name="xmlElement">XML element containing new state</param>
+        public void LoadXml(System.Xml.XmlElement xmlElement)
+        {
+            XmlNamespaceManager xmlNamespaceManager;
+            XmlNodeList xmlNodeList;
+
+            if (xmlElement == null)
+            {
+                throw new ArgumentNullException("xmlElement");
+            }
+
+            xmlNamespaceManager = new XmlNamespaceManager(xmlElement.OwnerDocument.NameTable);
+            xmlNamespaceManager.AddNamespace("xsd", XadesSignedXml.XadesNamespaceUri);
+
+            xmlNodeList = xmlElement.SelectNodes("xsd:SignaturePolicyId", xmlNamespaceManager);
+            if (xmlNodeList.Count != 0)
+            {
+                this.signaturePolicyId = new SignaturePolicyId();
+                this.signaturePolicyId.LoadXml((XmlElement)xmlNodeList.Item(0));
+                this.signaturePolicyImplied = false;
+            }
+            else
+            {
+                xmlNodeList = xmlElement.SelectNodes("xsd:SignaturePolicyImplied", xmlNamespaceManager);
+                if (xmlNodeList.Count != 0)
+                {
+                    this.signaturePolicyImplied = true;
+                    this.signaturePolicyId = null;
+                }
+                else
+                {
+                    throw new CryptographicException("SignaturePolicyId or SignaturePolicyImplied missing");
+                }
+            }
+        }
+
+        /// <summary>
+        /// Returns the XML representation of the this object
+        /// </summary>
+        /// <returns>XML element containing the state of this object</returns>
+        public XmlElement GetXml()
+        {
+            XmlDocument creationXmlDocument;
+            XmlElement retVal;
+            XmlElement bufferXmlElement;
+
+            creationXmlDocument = new XmlDocument();
+            retVal = creationXmlDocument.CreateElement("xades", "SignaturePolicyIdentifier", XadesSignedXml.XadesNamespaceUri);
+
+            if (this.signaturePolicyImplied)
+            { //Append empty element as required
+                bufferXmlElement = creationXmlDocument.CreateElement("xades", "SignaturePolicyImplied", XadesSignedXml.XadesNamespaceUri);
+                retVal.AppendChild(bufferXmlElement);
+            }
+            else
+            {
+                if (this.signaturePolicyId != null && this.signaturePolicyId.HasChanged())
+                {
+                    retVal.AppendChild(creationXmlDocument.ImportNode(this.signaturePolicyId.GetXml(), true));
+                }
+                else
+                {
+                    throw new CryptographicException("SignaturePolicyId or SignaturePolicyImplied missing in SignaturePolicyIdentifier");
+                }
+            }
+
+            return retVal;
+        }
+        #endregion
+    }
+}