gistfile1.txt

 public interface IAsymetricProviderFactory
    {
        void Initialize(byte[] cert);
        IAsymetricProvider GetProvider();
        IAsymetricProvider GetProvider(SecureString password);
    }

    public class RsaProviderFactory : IAsymetricProviderFactory
    {
        private byte[] _cert;
        public void Initialize(byte[] cert)
        {
            _cert = cert;
        }

        public IAsymetricProvider GetProvider()
        {
            var provider = new RsaProvider();
            provider.Initialize(new X509Certificate2(_cert));
            return provider;
        }

        public IAsymetricProvider GetProvider(SecureString password)
        {
            var provider = new RsaProvider();
            provider.Initialize(new X509Certificate2(_cert, password));
            return provider;
        }
    }