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

Hcs.Client/GostCryptography/Base/GostPrf.cs

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+using System;
+using System.Security;
+
+namespace GostCryptography.Base
+{
+    /// <summary>
+    /// Базовый класс для всех алгоритмов генерации псевдослучайной последовательности (Pseudorandom Function, PRF) ГОСТ
+    /// </summary>
+    public abstract class GostPRF : IDisposable, IGostAlgorithm
+    {
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        /// <param name="providerType">Тип криптографического провайдера</param>
+        [SecuritySafeCritical]
+        protected GostPRF(ProviderType providerType)
+        {
+            ProviderType = providerType;
+        }
+
+        /// <inheritdoc />
+        public ProviderType ProviderType { get; }
+
+        /// <inheritdoc />
+        public abstract string AlgorithmName { get; }
+
+        /// <summary>
+        /// Освобождает неуправляемые ресурсы
+        /// </summary>
+        protected virtual void Dispose(bool disposing)
+        {
+        }
+
+        /// <inheritdoc />
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <inheritdoc />
+        ~GostPRF()
+        {
+            Dispose(false);
+        }
+    }
+}