var cspParameters = new CspParameters(75, null, certificateName)
            {
                Flags = CspProviderFlags.UseExistingKey | CspProviderFlags.UseMachineKeyStore | CspProviderFlags.NoPrompt,
                KeyPassword = pin
            };

            var dummyHash = new byte[32];

            using (var prov = new Gost3410CryptoServiceProvider(cspParameters))
            {
                X509Certificate2 containerCertificate = prov.ContainerCertificate;

                var contentInfo = new ContentInfo(dummyHash);
                var signedCms = new SignedCms(contentInfo, true);
                var cmsSigner = new CmsSigner(containerCertificate);


                signedCms.ComputeSignature(cmsSigner);

            }