Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Security / System / Security / Cryptography / Xml / SignedInfo.cs / 1305376 / SignedInfo.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //[....] // // // SignedInfo.cs // // 21 [....] 2000 // namespace System.Security.Cryptography.Xml { using System; using System.Collections; using System.Runtime.InteropServices; using System.Xml; using System.Globalization; [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] public class SignedInfo : ICollection { private string m_id; private string m_canonicalizationMethod; private string m_signatureMethod; private string m_signatureLength; private ArrayList m_references; private XmlElement m_cachedXml = null; private SignedXml m_signedXml = null; private Transform m_canonicalizationMethodTransform = null; internal SignedXml SignedXml { get { return m_signedXml; } set { m_signedXml = value; } } public SignedInfo() { m_references = new ArrayList(); } public IEnumerator GetEnumerator() { throw new NotSupportedException(); } public void CopyTo(Array array, int index) { throw new NotSupportedException(); } public Int32 Count { get { throw new NotSupportedException(); } } public Boolean IsReadOnly { get { throw new NotSupportedException(); } } public Boolean IsSynchronized { get { throw new NotSupportedException(); } } public object SyncRoot { get { throw new NotSupportedException(); } } // // public properties // public string Id { get { return m_id; } set { m_id = value; m_cachedXml = null; } } public string CanonicalizationMethod { get { // Default the canonicalization method to C14N if (m_canonicalizationMethod == null) return SignedXml.XmlDsigC14NTransformUrl; return m_canonicalizationMethod; } set { m_canonicalizationMethod = value; m_cachedXml = null; } } [ComVisible(false)] public Transform CanonicalizationMethodObject { get { if (m_canonicalizationMethodTransform == null) { m_canonicalizationMethodTransform = CryptoConfig.CreateFromName(this.CanonicalizationMethod) as Transform; if (m_canonicalizationMethodTransform == null) throw new CryptographicException(String.Format(CultureInfo.CurrentCulture, SecurityResources.GetResourceString("Cryptography_Xml_CreateTransformFailed"), this.CanonicalizationMethod)); m_canonicalizationMethodTransform.SignedXml = this.SignedXml; m_canonicalizationMethodTransform.Reference = null; } return m_canonicalizationMethodTransform; } } public string SignatureMethod { get { return m_signatureMethod; } set { m_signatureMethod = value; m_cachedXml = null; } } public string SignatureLength { get { return m_signatureLength; } set { m_signatureLength = value; m_cachedXml = null; } } public ArrayList References { get { return m_references; } } internal bool CacheValid { get { if (m_cachedXml == null) return false; // now check all the references foreach (Reference reference in References) { if (!reference.CacheValid) return false; } return true; } } // // public methods // public XmlElement GetXml() { if (CacheValid) return m_cachedXml; XmlDocument document = new XmlDocument(); document.PreserveWhitespace = true; return GetXml(document); } internal XmlElement GetXml (XmlDocument document) { // Create the root element XmlElement signedInfoElement = document.CreateElement("SignedInfo", SignedXml.XmlDsigNamespaceUrl); if (!String.IsNullOrEmpty(m_id)) signedInfoElement.SetAttribute("Id", m_id); // Add the canonicalization method, defaults to SignedXml.XmlDsigNamespaceUrl XmlElement canonicalizationMethodElement = this.CanonicalizationMethodObject.GetXml(document, "CanonicalizationMethod"); signedInfoElement.AppendChild(canonicalizationMethodElement); // Add the signature method if (String.IsNullOrEmpty(m_signatureMethod)) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_SignatureMethodRequired")); XmlElement signatureMethodElement = document.CreateElement("SignatureMethod", SignedXml.XmlDsigNamespaceUrl); signatureMethodElement.SetAttribute("Algorithm", m_signatureMethod); // Add HMACOutputLength tag if we have one if (m_signatureLength != null) { XmlElement hmacLengthElement = document.CreateElement(null, "HMACOutputLength", SignedXml.XmlDsigNamespaceUrl); XmlText outputLength = document.CreateTextNode(m_signatureLength); hmacLengthElement.AppendChild(outputLength); signatureMethodElement.AppendChild(hmacLengthElement); } signedInfoElement.AppendChild(signatureMethodElement); // Add the references if (m_references.Count == 0) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_ReferenceElementRequired")); for (int i = 0; i < m_references.Count; ++i) { Reference reference = (Reference)m_references[i]; signedInfoElement.AppendChild(reference.GetXml(document)); } return signedInfoElement; } public void LoadXml(XmlElement value) { if (value == null) throw new ArgumentNullException("value"); // SignedInfo XmlElement signedInfoElement = value; if (!signedInfoElement.LocalName.Equals("SignedInfo")) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"), "SignedInfo"); XmlNamespaceManager nsm = new XmlNamespaceManager(value.OwnerDocument.NameTable); nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl); // Id attribute -- optional m_id = Utils.GetAttribute(signedInfoElement, "Id", SignedXml.XmlDsigNamespaceUrl); // CanonicalizationMethod -- must be present XmlElement canonicalizationMethodElement = signedInfoElement.SelectSingleNode("ds:CanonicalizationMethod", nsm) as XmlElement; if (canonicalizationMethodElement == null) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"),"SignedInfo/CanonicalizationMethod"); m_canonicalizationMethod = Utils.GetAttribute(canonicalizationMethodElement, "Algorithm", SignedXml.XmlDsigNamespaceUrl); m_canonicalizationMethodTransform = null; if (canonicalizationMethodElement.ChildNodes.Count > 0) this.CanonicalizationMethodObject.LoadInnerXml(canonicalizationMethodElement.ChildNodes); // SignatureMethod -- must be present XmlElement signatureMethodElement = signedInfoElement.SelectSingleNode("ds:SignatureMethod", nsm) as XmlElement; if (signatureMethodElement == null) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_InvalidElement"),"SignedInfo/SignatureMethod"); m_signatureMethod = Utils.GetAttribute(signatureMethodElement, "Algorithm", SignedXml.XmlDsigNamespaceUrl); // Now get the output length if we are using a MAC algorithm XmlElement signatureLengthElement = signatureMethodElement.SelectSingleNode("ds:HMACOutputLength", nsm) as XmlElement; if (signatureLengthElement != null) m_signatureLength = signatureLengthElement.InnerXml; // flush out any reference that was there m_references.Clear(); XmlNodeList referenceNodes = signedInfoElement.SelectNodes("ds:Reference", nsm); if (referenceNodes != null) { foreach(XmlNode node in referenceNodes) { XmlElement referenceElement = node as XmlElement; Reference reference = new Reference(); AddReference(reference); reference.LoadXml(referenceElement); } } // Save away the cached value m_cachedXml = signedInfoElement; } public void AddReference (Reference reference) { if (reference == null) throw new ArgumentNullException("reference"); reference.SignedXml = this.SignedXml; m_references.Add(reference); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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