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

Hcs.Client/GostCryptography/Asn1/Ber/Asn1Null.cs

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+using System;
+
+namespace GostCryptography.Asn1.Ber
+{
+    [Serializable]
+    public class Asn1Null : Asn1Type
+    {
+        public static readonly Asn1Tag Tag = new Asn1Tag(0, 0, NullTypeCode);
+        public static readonly Asn1Null NullValue = new Asn1Null();
+
+        public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
+        {
+            if (explicitTagging)
+            {
+                MatchTag(buffer, Tag);
+            }
+
+            buffer.TypeCode = NullTypeCode;
+        }
+
+        public override int Encode(Asn1BerEncodeBuffer buffer, bool explicitTagging)
+        {
+            var len = 0;
+
+            if (explicitTagging)
+            {
+                len += buffer.EncodeTagAndLength(Tag, len);
+            }
+
+            return len;
+        }
+
+        public override void Encode(Asn1BerOutputStream outs, bool explicitTagging)
+        {
+            if (explicitTagging)
+            {
+                outs.EncodeTag(Tag);
+            }
+
+            outs.EncodeLength(0);
+        }
+
+        public override string ToString()
+        {
+            return "NULL";
+        }
+    }
+}