public byte[] HashPassword(byte[] password, byte[] salt)
{
var saltedPassword = salt.Concat(password).ToArray();
var hashedPassword = new SHA512Managed().ComputeHash(saltedPassword);
var hashedSalt = new SHA512Managed().ComputeHash(salt);
var saltedHash = hashedSalt.Concat(hashedPassword).ToArray();
return(saltedHash);
}