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

Hcs.Client/GostCryptography/Asn1/Gost/PublicKey/SubjectPublicKeyInfo.cs

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+using GostCryptography.Asn1.Ber;
+using GostCryptography.Properties;
+
+namespace GostCryptography.Asn1.Gost.PublicKey
+{
+    public sealed class SubjectPublicKeyInfo : Asn1Type
+    {
+        public AlgorithmIdentifier Algorithm { get; set; }
+
+        public Asn1BitString SubjectPublicKey { get; set; }
+        
+        public override void Decode(Asn1BerDecodeBuffer buffer, bool explicitTagging, int implicitLength)
+        {
+            var elemLength = explicitTagging ? MatchTag(buffer, Asn1Tag.Sequence) : implicitLength;
+
+            Algorithm = null;
+            SubjectPublicKey = null;
+
+            var context = new Asn1BerDecodeContext(buffer, elemLength);
+            var parsedLen = new IntHolder();
+
+            if (!context.MatchElemTag(0, 0x20, 0x10, parsedLen, false))
+            {
+                throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
+            }
+
+            Algorithm = new AlgorithmIdentifier();
+            Algorithm.Decode(buffer, true, parsedLen.Value);
+
+            if (!context.MatchElemTag(0, 0, 3, parsedLen, false))
+            {
+                throw ExceptionUtility.CryptographicException(Resources.Asn1MissingRequiredException, buffer.ByteCount);
+            }
+
+            SubjectPublicKey = new Asn1BitString();
+            SubjectPublicKey.Decode(buffer, true, parsedLen.Value);
+        }
+
+        public override int Encode(Asn1BerEncodeBuffer buffer, bool explicitTagging)
+        {
+            var len = 0;
+            len += SubjectPublicKey.Encode(buffer, true);
+            len += Algorithm.Encode(buffer, true);
+
+            if (explicitTagging)
+            {
+                len += buffer.EncodeTagAndLength(Asn1Tag.Sequence, len);
+            }
+
+            return len;
+        }
+    }
+}