Refactor client classes

Hcs.Client/Client/Internal/CertificateHelper.cs

@@ -0,0 +1,81 @@
+using GostCryptography.Base;
+using System;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+
+namespace Hcs.Client.Internal
+{
+    internal static class CertificateHelper
+    {
+        internal 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;
+            }
+        }
+
+        internal static GostXades.CryptoProviderTypeEnum GetProviderType(this X509Certificate2 certificate)
+        {
+            return (GostXades.CryptoProviderTypeEnum)GetProviderInfo(certificate).Item1;
+        }
+
+        internal 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");
+            }
+        }
+
+        internal static X509Certificate2 FindCertificate(Func<X509Certificate2, bool> predicate)
+        {
+            if (predicate == null)
+            {
+                throw new ArgumentException("Null subject predicate");
+            }
+
+            var 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();
+            }
+        }
+    }
+}