Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.IdentityModel/System/IdentityModel/CipherDataElement.cs

@@ -0,0 +1,84 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.IdentityModel
+{
+    using System;
+    using System.Xml;
+
+    internal class CipherDataElement
+    {
+        byte[] _iv;
+        byte[] _cipherText;
+
+        public byte[] CipherValue
+        {
+            get
+            {
+                if ( _iv != null )
+                {
+                    byte[] buffer = new byte[_iv.Length + _cipherText.Length];
+                    Buffer.BlockCopy( _iv, 0, buffer, 0, _iv.Length );
+                    Buffer.BlockCopy( _cipherText, 0, buffer, _iv.Length, _cipherText.Length );
+                    _iv = null;
+                }
+
+                return _cipherText;
+            }
+            set
+            {
+                _cipherText = value;
+            }
+        }
+
+        public void ReadXml( XmlDictionaryReader reader )
+        {
+            if ( reader == null )
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull( "reader" );
+            }
+
+            reader.MoveToContent();
+            if ( !reader.IsStartElement( XmlEncryptionConstants.Elements.CipherData, XmlEncryptionConstants.Namespace ) )
+            {
+                throw DiagnosticUtility.ThrowHelperXml( reader, SR.GetString( SR.ID4188 ) );
+            }
+
+            reader.ReadStartElement( XmlEncryptionConstants.Elements.CipherData, XmlEncryptionConstants.Namespace );
+            reader.ReadStartElement( XmlEncryptionConstants.Elements.CipherValue, XmlEncryptionConstants.Namespace );
+
+            _cipherText = reader.ReadContentAsBase64();
+            _iv         = null;
+
+            // <CipherValue>
+            reader.MoveToContent();           
+            reader.ReadEndElement();
+
+            
+            // <CipherData>
+            reader.MoveToContent();
+            reader.ReadEndElement(); 
+        }
+
+        public void SetCipherValueFragments( byte[] iv, byte[] cipherText )
+        {
+            _iv         = iv;
+            _cipherText = cipherText;
+        }
+
+        public void WriteXml( XmlWriter writer )
+        {
+            writer.WriteStartElement( XmlEncryptionConstants.Prefix, XmlEncryptionConstants.Elements.CipherData, XmlEncryptionConstants.Namespace );
+            writer.WriteStartElement( XmlEncryptionConstants.Prefix, XmlEncryptionConstants.Elements.CipherValue, XmlEncryptionConstants.Namespace );
+
+            if ( _iv != null )
+                writer.WriteBase64( _iv, 0, _iv.Length );
+
+            writer.WriteBase64( _cipherText, 0, _cipherText.Length );
+
+            writer.WriteEndElement(); // CipherValue
+            writer.WriteEndElement(); // CipherData
+        }
+    }
+}