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

Hcs.Client/GostCryptography/Base/GostSymmetricAlgorithm.cs

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+using GostCryptography.Config;
+using System.Security;
+using System.Security.Cryptography;
+
+namespace GostCryptography.Base
+{
+    /// <summary>
+    /// Базовый класс для всех алгоритмов симметричного шифрования ГОСТ
+    /// </summary>
+    public abstract class GostSymmetricAlgorithm : SymmetricAlgorithm, IGostAlgorithm
+    {
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        /// <remarks>
+        /// По умолчанию использует криптографический провайдер, установленный в <see cref="GostCryptoConfig.ProviderType"/>
+        /// </remarks>
+        [SecuritySafeCritical]
+        protected GostSymmetricAlgorithm() : this(GostCryptoConfig.ProviderType)
+        {
+        }
+
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        /// <param name="providerType">Тип криптографического провайдера</param>
+        [SecuritySafeCritical]
+        protected GostSymmetricAlgorithm(ProviderType providerType)
+        {
+            ProviderType = providerType;
+        }
+
+        /// <inheritdoc />
+        public ProviderType ProviderType { get; }
+
+        /// <inheritdoc />
+        public abstract string AlgorithmName { get; }
+    }
+}