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

Hcs.Client/GostCryptography/ExceptionUtility.cs

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+using System;
+using System.Security.Cryptography;
+
+namespace GostCryptography
+{
+    static class ExceptionUtility
+    {
+        public static ArgumentException Argument(string argument, string message = null, params object[] messageParameters)
+        {
+            return new ArgumentException(FormatErrorMessage(message, messageParameters), argument);
+        }
+
+        public static ArgumentNullException ArgumentNull(string argument, string message = null, params object[] messageParameters)
+        {
+            return new ArgumentNullException(argument, FormatErrorMessage(message, messageParameters));
+        }
+
+        public static ArgumentOutOfRangeException ArgumentOutOfRange(string argument, string message = null, params object[] messageParameters)
+        {
+            return new ArgumentOutOfRangeException(argument, FormatErrorMessage(message, messageParameters));
+        }
+
+        public static NotSupportedException NotSupported(string message = null, params object[] messageParameters)
+        {
+            return new NotSupportedException(FormatErrorMessage(message, messageParameters));
+        }
+
+        public static CryptographicException CryptographicException(int nativeError)
+        {
+            return new CryptographicException(nativeError);
+        }
+
+        public static CryptographicException CryptographicException(string message = null, params object[] messageParameters)
+        {
+            return new CryptographicException(FormatErrorMessage(message, messageParameters));
+        }
+
+        public static CryptographicException CryptographicException(Exception innerException, string message = null, params object[] messageParameters)
+        {
+            return new CryptographicException(FormatErrorMessage(message, messageParameters), innerException);
+        }
+
+        private static string FormatErrorMessage(string message, params object[] messageParameters)
+        {
+            return (message != null && messageParameters != null) ? string.Format(message, messageParameters) : message;
+        }
+    }
+}