class Argon2::Password

def create(pass)
  raise ArgonHashFail, "Invalid password (expected string)" unless
    pass.is_a?(String)
  # Ensure salt is freshly generated unless it was intentionally supplied.
  salt = @salt_do_not_supply || Engine.saltgen
  Argon2::Engine.hash_argon2id_encode(
    pass, salt, @t_cost, @m_cost, @p_cost, @secret)
end