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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_PRF.cs

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+using GostCryptography.Base;
+using GostCryptography.Gost_28147_89;
+using System.Security;
+
+namespace GostCryptography.Gost_R3411
+{
+    /// <summary>
+    /// Реализация PRF на базе алгоритма хэширования ГОСТ Р 34.11-94
+    /// </summary>
+    public sealed class Gost_R3411_94_PRF : Gost_R3411_PRF<Gost_R3411_94_HMAC>
+    {
+        /// <summary>
+        /// Наименование алгоритма PRF на базе ГОСТ Р 34.11-94 для использования в протоколе WS-Trust
+        /// </summary>
+        public const string WsTrustAlgorithmNameValue = "http://docs.oasis-open.org/ws-sx/ws-trust/200512/CK/PGOSTR3411";
+
+        /// <summary>
+        /// Наименование алгоритма PRF на базе ГОСТ Р 34.11-94 для использования в протоколах на базе WS-SecureConversation
+        /// </summary>
+        public const string WsSecureConversationAlgorithmNameValue = "http://docs.oasis-open.org/ws-sx/ws-secureconversation/200512/dk/p_gostr3411";
+
+        /// <summary>
+        /// Известные наименования алгоритма PRF на базе ГОСТ Р 34.11-94
+        /// </summary>
+        public static readonly string[] KnownAlgorithmNames = { WsTrustAlgorithmNameValue, WsSecureConversationAlgorithmNameValue };
+
+        /// <inheritdoc />
+        [SecuritySafeCritical]
+        public Gost_R3411_94_PRF(Gost_28147_89_SymmetricAlgorithmBase key, byte[] label, byte[] seed) : base(key, label, seed)
+        {
+        }
+
+        /// <inheritdoc />
+        [SecuritySafeCritical]
+        public Gost_R3411_94_PRF(ProviderType providerType, byte[] key, byte[] label, byte[] seed) : base(providerType, key, label, seed)
+        {
+        }
+
+        /// <inheritdoc />
+        public override string AlgorithmName => WsTrustAlgorithmNameValue;
+
+        /// <inheritdoc />
+        [SecuritySafeCritical]
+        protected override Gost_R3411_94_HMAC CreateHMAC(Gost_28147_89_SymmetricAlgorithm key)
+        {
+            return new Gost_R3411_94_HMAC(key);
+        }
+    }
+}