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

Hcs.Client/GostCryptography/Gost_R3411/Gost_R3411_94_HashAlgorithm.cs

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+using GostCryptography.Base;
+using GostCryptography.Native;
+using System.Security;
+
+namespace GostCryptography.Gost_R3411
+{
+    /// <summary>
+    /// Реализация алгоритма хэширования ГОСТ Р 34.11-94
+    /// </summary>
+    public sealed class Gost_R3411_94_HashAlgorithm : Gost_R3411_HashAlgorithm
+    {
+        /// <summary>
+        /// Размер хэша ГОСТ Р 34.11-94
+        /// </summary>
+        public const int DefaultHashSizeValue = 256;
+
+        /// <summary>
+        /// Наименование алгоритма хэширования ГОСТ Р 34.11-94
+        /// </summary>
+        public const string AlgorithmNameValue = "urn:ietf:params:xml:ns:cpxmlsec:algorithms:gostr3411";
+
+        /// <summary>
+        /// Устаревшее наименование алгоритма хэширования ГОСТ Р 34.11-94
+        /// </summary>
+        public const string ObsoleteAlgorithmNameValue = "http://www.w3.org/2001/04/xmldsig-more#gostr3411";
+
+        /// <summary>
+        /// Известные наименования алгоритма хэширования ГОСТ Р 34.11-94
+        /// </summary>
+        public static readonly string[] KnownAlgorithmNames = { AlgorithmNameValue, ObsoleteAlgorithmNameValue };
+
+        /// <inheritdoc />
+        [SecuritySafeCritical]
+        public Gost_R3411_94_HashAlgorithm() : base(DefaultHashSizeValue)
+        {
+        }
+
+        /// <inheritdoc />
+        [SecuritySafeCritical]
+        public Gost_R3411_94_HashAlgorithm(ProviderType providerType) : base(providerType, DefaultHashSizeValue)
+        {
+        }
+
+        [SecurityCritical]
+        internal Gost_R3411_94_HashAlgorithm(ProviderType providerType, SafeProvHandleImpl providerHandle) : base(providerType, providerHandle, DefaultHashSizeValue)
+        {
+        }
+
+        /// <inheritdoc />
+        public override string AlgorithmName => AlgorithmNameValue;
+
+        /// <inheritdoc />
+        [SecurityCritical]
+        protected override SafeHashHandleImpl CreateHashHandle(SafeProvHandleImpl providerHandle)
+        {
+            return CryptoApiHelper.CreateHash_3411_94(providerHandle);
+        }
+    }
+}