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

Hcs.Client/ClientApi/HcsCertificateHelper.cs

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+using GostCryptography.Base;
+using System;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+
+namespace Hcs.ClientApi
+{
+    public static class HcsCertificateHelper
+    {
+        public static bool IsGostPrivateKey(this X509Certificate2 certificate)
+        {
+            try
+            {
+                if (certificate.HasPrivateKey)
+                {
+                    var cspInfo = certificate.GetPrivateKeyInfo();
+                    if (cspInfo.ProviderType == (int)ProviderType.CryptoPro ||
+                        cspInfo.ProviderType == (int)ProviderType.VipNet ||
+                        cspInfo.ProviderType == (int)ProviderType.CryptoPro_2012_512 ||
+                        cspInfo.ProviderType == (int)ProviderType.CryptoPro_2012_1024)
+                        return true;
+                    else
+                        return false;
+
+                }
+                return false;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public static Hcs.GostXades.CryptoProviderTypeEnum GetProviderType(this X509Certificate2 certificate)
+        {
+            return (Hcs.GostXades.CryptoProviderTypeEnum)GetProviderInfo(certificate).Item1;
+        }
+
+        public static Tuple<int, string> GetProviderInfo(this X509Certificate2 certificate)
+        {
+            if (certificate.HasPrivateKey)
+            {
+                var cspInfo = certificate.GetPrivateKeyInfo();
+                return new Tuple<int, string>(cspInfo.ProviderType, cspInfo.ProviderName);
+            }
+            else
+                throw new Exception("Certificate has no private key");
+        }
+
+        public static X509Certificate2 FindCertificate(Func<X509Certificate2, bool> predicate)
+        {
+            if (predicate == null) throw new ArgumentException("Null subject predicate");
+            X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
+
+            try
+            {
+                store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
+
+                var collection = store.Certificates
+                    .OfType<X509Certificate2>()
+                    .Where(x => x.HasPrivateKey && x.IsGostPrivateKey());
+
+                var now = DateTime.Now;
+                return collection.First(
+                    x => now >= x.NotBefore && now <= x.NotAfter && predicate(x));
+            }
+            finally
+            {
+                store.Close();
+            }
+        }
+
+        public static X509Certificate2 ShowCertificateUI()
+        {
+            X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
+            try
+            {
+                store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
+
+                var collection = store.Certificates
+                    .OfType<X509Certificate2>()
+                    .Where(x => x.HasPrivateKey && x.IsGostPrivateKey());
+
+                string prompt = "Выберите сертификат";
+                var cert = X509Certificate2UI.SelectFromCollection(
+                    new X509Certificate2Collection(
+                        collection.ToArray()), prompt, "", X509SelectionFlag.SingleSelection)[0];
+                return cert;
+            }
+            finally
+            {
+                store.Close();
+            }
+        }
+    }
+}