EncryptedReference.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Security / System / Security / Cryptography / Xml / EncryptedReference.cs / 1305376 / EncryptedReference.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// EncryptedReference.cs 
//
// This object implements the EncryptedReference element.
//
// 04/01/2002 
//
 
namespace System.Security.Cryptography.Xml 
{
    using System; 
    using System.Collections;
    using System.Xml;

    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public abstract class EncryptedReference {
        private string m_uri; 
        private string m_referenceType; 
        private TransformChain m_transformChain;
        internal XmlElement m_cachedXml = null; 

        protected EncryptedReference () : this (String.Empty, new TransformChain()) {
        }
 
        protected EncryptedReference (string uri) : this (uri, new TransformChain()) {
        } 
 
        protected EncryptedReference (string uri, TransformChain transformChain) {
            this.TransformChain = transformChain; 
            this.Uri = uri;
            m_cachedXml = null;
        }
 
        public string Uri {
            get { return m_uri; } 
            set { 
                if (value == null)
                    throw new ArgumentNullException(SecurityResources.GetResourceString("Cryptography_Xml_UriRequired")); 
                m_uri = value;
                m_cachedXml = null;
            }
        } 

        public TransformChain TransformChain { 
            get { 
                if (m_transformChain == null)
                    m_transformChain = new TransformChain(); 
                return m_transformChain;
            }
            set {
                m_transformChain = value; 
                m_cachedXml = null;
            } 
        } 

        public void AddTransform (Transform transform) { 
            this.TransformChain.Add(transform);
        }

        protected string ReferenceType { 
            get { return m_referenceType; }
            set { 
                m_referenceType = value; 
                m_cachedXml = null;
            } 
        }

        internal protected bool CacheValid {
            get { 
                return (m_cachedXml != null);
            } 
        } 

        public virtual XmlElement GetXml () { 
            if (CacheValid) return m_cachedXml;

            XmlDocument document = new XmlDocument();
            document.PreserveWhitespace = true; 
            return GetXml(document);
        } 
 
        internal XmlElement GetXml (XmlDocument document) {
            if (ReferenceType == null) 
                throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_ReferenceTypeRequired"));

            // Create the Reference
            XmlElement referenceElement = document.CreateElement(ReferenceType, EncryptedXml.XmlEncNamespaceUrl); 
            if (!String.IsNullOrEmpty(m_uri))
                referenceElement.SetAttribute("URI", m_uri); 
 
            // Add the transforms to the CipherReference
            if (this.TransformChain.Count > 0) 
                referenceElement.AppendChild(this.TransformChain.GetXml(document, SignedXml.XmlDsigNamespaceUrl));

            return referenceElement;
        } 

        public virtual void LoadXml (XmlElement value) { 
            if (value == null) 
                throw new ArgumentNullException("value");
 
            this.ReferenceType = value.LocalName;
            this.Uri = Utils.GetAttribute(value, "URI", EncryptedXml.XmlEncNamespaceUrl);

            // Transforms 
            XmlNamespaceManager nsm = new XmlNamespaceManager(value.OwnerDocument.NameTable);
            nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl); 
            XmlNode transformsNode = value.SelectSingleNode("ds:Transforms", nsm); 
            if (transformsNode != null)
                this.TransformChain.LoadXml(transformsNode as XmlElement); 

            // cache the Xml
            m_cachedXml = value;
        } 
    }
 
    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public sealed class CipherReference : EncryptedReference {
        private byte[] m_cipherValue; 

        public CipherReference () : base () {
            ReferenceType = "CipherReference";
        } 

        public CipherReference (string uri) : base(uri) { 
            ReferenceType = "CipherReference"; 
        }
 
        public CipherReference (string uri, TransformChain transformChain) : base(uri, transformChain) {
            ReferenceType = "CipherReference";
        }
 
        // This method is used to cache results from resolved cipher references.
        internal byte[] CipherValue { 
            get { 
                if (!CacheValid)
                    return null; 
                return m_cipherValue;
            }
            set {
                m_cipherValue = value; 
            }
        } 
 
        public override XmlElement GetXml () {
            if (CacheValid) return m_cachedXml; 

            XmlDocument document = new XmlDocument();
            document.PreserveWhitespace = true;
            return GetXml(document); 
        }
 
        new internal XmlElement GetXml (XmlDocument document) { 
            if (ReferenceType == null)
                throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_ReferenceTypeRequired")); 

            // Create the Reference
            XmlElement referenceElement = document.CreateElement(ReferenceType, EncryptedXml.XmlEncNamespaceUrl);
            if (!String.IsNullOrEmpty(this.Uri)) 
                referenceElement.SetAttribute("URI", this.Uri);
 
            // Add the transforms to the CipherReference 
            if (this.TransformChain.Count > 0)
                referenceElement.AppendChild(this.TransformChain.GetXml(document, EncryptedXml.XmlEncNamespaceUrl)); 

            return referenceElement;
        }
 
        public override void LoadXml (XmlElement value) {
            if (value == null) 
                throw new ArgumentNullException("value"); 

            this.ReferenceType = value.LocalName; 
            this.Uri = Utils.GetAttribute(value, "URI", EncryptedXml.XmlEncNamespaceUrl);

            // Transforms
            XmlNamespaceManager nsm = new XmlNamespaceManager(value.OwnerDocument.NameTable); 
            nsm.AddNamespace("enc", EncryptedXml.XmlEncNamespaceUrl);
            XmlNode transformsNode = value.SelectSingleNode("enc:Transforms", nsm); 
            if (transformsNode != null) 
                this.TransformChain.LoadXml(transformsNode as XmlElement);
 
            // cache the Xml
            m_cachedXml = value;
        }
    } 

    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public sealed class DataReference : EncryptedReference { 
        public DataReference () : base () {
            ReferenceType = "DataReference"; 
        }

        public DataReference (string uri) : base(uri) {
            ReferenceType = "DataReference"; 
        }
 
        public DataReference (string uri, TransformChain transformChain) : base(uri, transformChain) { 
            ReferenceType = "DataReference";
        } 
    }

    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)]
    public sealed class KeyReference : EncryptedReference { 
        public KeyReference () : base () {
            ReferenceType = "KeyReference"; 
        } 

        public KeyReference (string uri) : base(uri) { 
            ReferenceType = "KeyReference";
        }

        public KeyReference (string uri, TransformChain transformChain) : base(uri, transformChain) { 
            ReferenceType = "KeyReference";
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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