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

Hcs.Client/GostCryptography/Base/GostExternalAsymmetricAlgorithm.cs

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+using GostCryptography.Properties;
+using System;
+using System.Security.Cryptography;
+
+namespace GostCryptography.Base
+{
+    /// <summary>
+    /// На базе заданного экземпляра <see cref="AsymmetricAlgorithm"/> пытается реализовать <see cref="GostAsymmetricAlgorithm"/>.
+    /// Данный класс предназначен для интеграции со сторонними библиотеками и предназначен для внутреннего использования.
+    /// </summary>
+    sealed class GostExternalAsymmetricAlgorithm : GostAsymmetricAlgorithm
+    {
+        private readonly AsymmetricAlgorithm _algorithm;
+        private readonly Func<byte[], byte[]> _createSignature;
+        private readonly Func<byte[], byte[], bool> _verifySignature;
+
+        public GostExternalAsymmetricAlgorithm(AsymmetricAlgorithm algorithm) : base(default(ProviderType), algorithm.KeySize)
+        {
+            var createSignatureMethod = algorithm.GetType().GetMethod(nameof(CreateSignature), new[] { typeof(byte[]) });
+            var verifySignatureMethod = algorithm.GetType().GetMethod(nameof(VerifySignature), new[] { typeof(byte[]), typeof(byte[]) });
+
+            if ((createSignatureMethod == null || createSignatureMethod.ReturnType != typeof(byte[]))
+                || (verifySignatureMethod == null || verifySignatureMethod.ReturnType != typeof(bool)))
+            {
+                throw ExceptionUtility.Argument(nameof(algorithm), Resources.ShouldSupportGost3410);
+            }
+
+            _algorithm = algorithm;
+            _createSignature = hash => (byte[])createSignatureMethod.Invoke(algorithm, new object[] { hash });
+            _verifySignature = (hash, signature) => (bool)verifySignatureMethod.Invoke(algorithm, new object[] { hash, signature });
+        }
+
+        public override string AlgorithmName => _algorithm.SignatureAlgorithm;
+
+        public override string SignatureAlgorithm => _algorithm.SignatureAlgorithm;
+
+        public override string KeyExchangeAlgorithm => _algorithm.KeyExchangeAlgorithm;
+
+        public override string ToXmlString(bool includePrivateKey) => _algorithm.ToXmlString(includePrivateKey);
+
+        public override void FromXmlString(string keyParametersXml) => _algorithm.FromXmlString(keyParametersXml);
+
+        public override byte[] CreateSignature(byte[] hash) => _createSignature(hash);
+
+        public override bool VerifySignature(byte[] hash, byte[] signature) => _verifySignature(hash, signature);
+
+        public override GostHashAlgorithm CreateHashAlgorithm() => throw ExceptionUtility.NotSupported();
+
+        public override GostKeyExchangeFormatter CreateKeyExchangeFormatter() => throw ExceptionUtility.NotSupported();
+
+        public override GostKeyExchangeDeformatter CreateKeyExchangeDeformatter() => throw ExceptionUtility.NotSupported();
+    }
+}