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

Hcs.Client/GostCryptography/Reflection/CryptographyUtils.cs

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+using System;
+using System.Reflection;
+using System.Security.Cryptography;
+
+namespace GostCryptography.Reflection
+{
+    static class CryptographyUtils
+    {
+        private static readonly object ObjToHashAlgorithmMethodSync = new object();
+        private static volatile MethodInfo _objToHashAlgorithmMethod;
+
+        public static HashAlgorithm ObjToHashAlgorithm(object hashAlg)
+        {
+            if (hashAlg == null)
+            {
+                throw ExceptionUtility.ArgumentNull(nameof(hashAlg));
+            }
+
+            HashAlgorithm hashAlgorithm = null;
+
+            if (_objToHashAlgorithmMethod == null)
+            {
+                lock (ObjToHashAlgorithmMethodSync)
+                {
+                    if (_objToHashAlgorithmMethod == null)
+                    {
+                        var utilsType = Type.GetType("System.Security.Cryptography.Utils");
+
+                        if (utilsType != null)
+                        {
+                            _objToHashAlgorithmMethod = utilsType.GetMethod("ObjToHashAlgorithm", BindingFlags.Static | BindingFlags.NonPublic, null, new[] { typeof(object) }, null);
+                        }
+                    }
+                }
+            }
+
+            if (_objToHashAlgorithmMethod != null)
+            {
+                try
+                {
+                    hashAlgorithm = _objToHashAlgorithmMethod.Invoke(null, new[] { hashAlg }) as HashAlgorithm;
+                }
+                catch (TargetInvocationException exception)
+                {
+                    if (exception.InnerException != null)
+                    {
+                        throw exception.InnerException;
+                    }
+
+                    throw;
+                }
+            }
+
+            return hashAlgorithm;
+        }
+    }
+}