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

Hcs.Client/GostCryptography/Reflection/EncryptedXmlHelper.cs

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+using GostCryptography.Properties;
+using System.Collections;
+using System.Reflection;
+using System.Security.Cryptography.Xml;
+using System.Xml;
+
+namespace GostCryptography.Reflection
+{
+    static class EncryptedXmlHelper
+    {
+        private static readonly object DocumentFieldSync = new object();
+        private static volatile FieldInfo _documentField;
+
+        public static XmlDocument GetDocument(this EncryptedXml encryptedXml)
+        {
+            if (_documentField == null)
+            {
+                lock (DocumentFieldSync)
+                {
+                    if (_documentField == null)
+                    {
+                        _documentField = typeof(EncryptedXml).GetField("m_document", BindingFlags.Instance | BindingFlags.NonPublic);
+                    }
+                }
+            }
+
+            if (_documentField == null)
+            {
+                throw ExceptionUtility.CryptographicException(Resources.XmlCannotFindPrivateMember, "m_document");
+            }
+
+            return (XmlDocument)_documentField.GetValue(encryptedXml);
+        }
+
+        private static readonly object KeyNameMappingFieldSync = new object();
+        private static volatile FieldInfo _keyNameMappingField;
+
+        public static Hashtable GetKeyNameMapping(this EncryptedXml encryptedXml)
+        {
+            if (_keyNameMappingField == null)
+            {
+                lock (KeyNameMappingFieldSync)
+                {
+                    if (_keyNameMappingField == null)
+                    {
+                        _keyNameMappingField = typeof(EncryptedXml).GetField("m_keyNameMapping", BindingFlags.Instance | BindingFlags.NonPublic);
+                    }
+                }
+            }
+
+            if (_keyNameMappingField == null)
+            {
+                throw ExceptionUtility.CryptographicException(Resources.XmlCannotFindPrivateMember, "m_keyNameMapping");
+            }
+
+            return (Hashtable)_keyNameMappingField.GetValue(encryptedXml);
+        }
+
+        private static readonly object GetCipherValueMethodSync = new object();
+        private static volatile MethodInfo _getCipherValueMethod;
+
+        public static byte[] GetCipherValue(this EncryptedXml encryptedXml, CipherData cipherData)
+        {
+            if (_getCipherValueMethod == null)
+            {
+                lock (GetCipherValueMethodSync)
+                {
+                    if (_getCipherValueMethod == null)
+                    {
+                        _getCipherValueMethod = typeof(EncryptedXml).GetMethod("GetCipherValue", BindingFlags.Instance | BindingFlags.NonPublic);
+                    }
+                }
+            }
+
+            if (_getCipherValueMethod == null)
+            {
+                throw ExceptionUtility.CryptographicException(Resources.XmlCannotFindPrivateMember, "GetCipherValue()");
+            }
+
+            return (byte[])_getCipherValueMethod.Invoke(encryptedXml, new object[] { cipherData });
+        }
+    }
+}