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

Hcs.Client/GostCryptography/Base/GostAsymmetricAlgorithm.cs

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+using System.Security.Cryptography;
+
+namespace GostCryptography.Base
+{
+    /// <summary>
+    /// Базовый класс для всех асимметричных алгоритмов ГОСТ
+    /// </summary>
+    public abstract class GostAsymmetricAlgorithm : AsymmetricAlgorithm, IGostAlgorithm
+    {
+        /// <summary>
+        /// Конструктор
+        /// </summary>
+        /// <param name="providerType">Тип криптографического провайдера</param>
+        /// <param name="keySize">Размер ключа в битах</param>
+        protected GostAsymmetricAlgorithm(ProviderType providerType, int keySize)
+        {
+            ProviderType = providerType;
+            KeySizeValue = keySize;
+            LegalKeySizesValue = new[] { new KeySizes(keySize, keySize, 0) };
+        }
+
+        /// <inheritdoc />
+        public ProviderType ProviderType { get; }
+
+        /// <inheritdoc />
+        public abstract string AlgorithmName { get; }
+
+        /// <summary>
+        /// Вычисляет цифровую подпись
+        /// </summary>
+        public abstract byte[] CreateSignature(byte[] hash);
+
+        /// <summary>
+        /// Проверяет цифровую подпись
+        /// </summary>
+        public abstract bool VerifySignature(byte[] hash, byte[] signature);
+
+        /// <summary>
+        /// Создает экземпляр <see cref="GostHashAlgorithm"/>
+        /// </summary>
+        public abstract GostHashAlgorithm CreateHashAlgorithm();
+
+        /// <summary>
+        /// Создает экземпляр <see cref="GostKeyExchangeFormatter"/>
+        /// </summary>
+        /// <returns></returns>
+        public abstract GostKeyExchangeFormatter CreateKeyExchangeFormatter();
+
+        /// <summary>
+        /// Создает экземпляр <see cref="GostKeyExchangeDeformatter"/>
+        /// </summary>
+        public abstract GostKeyExchangeDeformatter CreateKeyExchangeDeformatter();
+    }
+}