void Import()
        {
            X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadWrite);

            var certs = Read(@"c:\temp\cert\test2.pfx", "123");
            foreach(var cert in certs)
            {
                store.Add(cert);
            }

            store.Close();
        }

        public X509Certificate2[] Read(string filename, string password)
        {

            FileStream stream = new FileStream(filename, FileMode.Open);
            byte[] buffer = new byte[stream.Length];
            stream.Read(buffer, 0, buffer.Length);
            stream.Close();

            CRYPT_DATA_BLOB cryptdata = new CRYPT_DATA_BLOB();
            cryptdata.cbData = buffer.Length;
            cryptdata.pbData = Marshal.AllocHGlobal(cryptdata.cbData);
            Marshal.Copy(buffer, 0, cryptdata.pbData, buffer.Length);

            IntPtr hMemStore = PFXImportCertStore(ref cryptdata, password, PKCS12_IMPORT_SILENT);
            Marshal.FreeHGlobal(cryptdata.pbData);

            uint provinfosize = 0;
            uint hcryptrovsize = 0;

            List<X509Certificate2> certs = new List<X509Certificate2>();

            IntPtr certHandle = IntPtr.Zero;
            while ((certHandle = CertEnumCertificatesInStore(hMemStore, certHandle)) != IntPtr.Zero)
            {
                
                if (CertGetCertificateContextProperty(certHandle, CERT_KEY_PROV_INFO_PROP_ID, IntPtr.Zero, ref provinfosize))
                {
                    IntPtr info = Marshal.AllocHGlobal((int)provinfosize);
                    if (CertGetCertificateContextProperty(certHandle, CERT_KEY_PROV_INFO_PROP_ID, info, ref provinfosize))
                    {
                        IntPtr HCRYPTPROV = IntPtr.Zero;
                        if (CertGetCertificateContextProperty(certHandle, CERT_HCRYPTPROV_OR_NCRYPT_KEY_HANDLE_PROP_ID, HCRYPTPROV, ref hcryptrovsize))
                        {
                            CryptSetProvParam(HCRYPTPROV, PP_SET_PIN, Encoding.ASCII.GetBytes("123"), 0); // в эту строчку не заходит
                        }
                        else
                        {
                            var err = GetLastError(); //ошибка CRYPT_E_NOT_FOUND
                        }

                        
                        var certData = new X509Certificate2(certHandle).Export(X509ContentType.SerializedCert);
                        certs.Add(new X509Certificate2(certData));
                    }
                    Marshal.FreeHGlobal(info);

                }
            }

            Marshal.FreeHGlobal(hMemStore);
            return certs.ToArray();

        }

        void Import()
        {
            X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadWrite);

            var certs = Read(@"c:\temp\cert\test.pfx", "123");
            SecureString pass = new SecureString();
            pass.AppendChar('1');
            pass.AppendChar('2');
            pass.AppendChar('3');
            foreach (var cert in certs)
            {
                ((Gost3410_2012_256CryptoServiceProvider)cert.PrivateKey).SetContainerPassword(pass);
                store.Add(cert);
            }


            store.Close();
       }