CipherData.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Security / System / Security / Cryptography / Xml / CipherData.cs / 1305376 / CipherData.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// CipherData.cs 
//
// This object implements the CipherData element.
//
// 04/01/2001 
//
 
namespace System.Security.Cryptography.Xml 
{
    using System; 
    using System.Collections;
    using System.Xml;

    [System.Security.Permissions.HostProtection(MayLeakOnAbort = true)] 
    public sealed class CipherData {
        private XmlElement m_cachedXml = null; 
        private CipherReference m_cipherReference = null; 
        private byte[] m_cipherValue = null;
 
        public CipherData () {}

        public CipherData (byte[] cipherValue) {
            this.CipherValue = cipherValue; 
        }
 
        public CipherData (CipherReference cipherReference) { 
            this.CipherReference = cipherReference;
        } 

        private bool CacheValid {
            get {
                return (m_cachedXml != null); 
            }
        } 
 
        public CipherReference CipherReference {
            get { return m_cipherReference; } 
            set {
                if (value == null)
                    throw new ArgumentNullException("value");
                if (this.CipherValue != null) 
                    throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CipherValueElementRequired"));
 
                m_cipherReference = value; 
                m_cachedXml = null;
            } 
        }

        public byte[] CipherValue {
            get { return m_cipherValue; } 
            set {
                if (value == null) 
                    throw new ArgumentNullException("value"); 
                if (this.CipherReference != null)
                    throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CipherValueElementRequired")); 

                m_cipherValue = (byte[]) value.Clone();
                m_cachedXml = null;
            } 
        }
 
        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 CipherData element 
            XmlElement cipherDataElement = (XmlElement)document.CreateElement("CipherData", EncryptedXml.XmlEncNamespaceUrl);
            if (CipherValue != null) { 
                XmlElement cipherValueElement = document.CreateElement("CipherValue", EncryptedXml.XmlEncNamespaceUrl);
                cipherValueElement.AppendChild(document.CreateTextNode(Convert.ToBase64String(CipherValue)));
                cipherDataElement.AppendChild(cipherValueElement);
            } else { 
                // No CipherValue specified, see if there is a CipherReference
                if (CipherReference == null) 
                    throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CipherValueElementRequired")); 
                cipherDataElement.AppendChild(CipherReference.GetXml(document));
            } 
            return cipherDataElement;
        }

        public void LoadXml (XmlElement value) { 
            if (value == null)
                throw new ArgumentNullException("value"); 
 
            XmlNamespaceManager nsm = new XmlNamespaceManager(value.OwnerDocument.NameTable);
            nsm.AddNamespace("enc", EncryptedXml.XmlEncNamespaceUrl); 

            XmlNode cipherValueNode = value.SelectSingleNode("enc:CipherValue", nsm);
            XmlNode cipherReferenceNode = value.SelectSingleNode("enc:CipherReference", nsm);
            if (cipherValueNode != null) { 
                if (cipherReferenceNode != null)
                    throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CipherValueElementRequired")); 
                m_cipherValue = Convert.FromBase64String(Utils.DiscardWhiteSpaces(cipherValueNode.InnerText)); 
            } else if (cipherReferenceNode != null) {
                m_cipherReference = new CipherReference(); 
                m_cipherReference.LoadXml((XmlElement) cipherReferenceNode);
            } else {
                throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CipherValueElementRequired"));
            } 

            // Save away the cached value 
            m_cachedXml = value; 
        }
    } 
}

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

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