public byte[] SignData(byte[] data)
{
    using (var sha256 = SHA256.Create())
    {
        using (var rsa = (RSACryptoServiceProvider) Certificate.PrivateKey)
        {
            return rsa.SignData(data, sha256);
        }
    }
}


public bool VerifySignature(byte[] data, byte[] signature)
{
    using (var sha256 = SHA256.Create())
    {
        using (var rsa = (RSACryptoServiceProvider) Certificate.PrivateKey)
        {
            return rsa.VerifyData(data, sha256, signature);
        }
    }
}