lib/ed25519_keccak/ed25519base.rb
def secret_to_public(secret, form=:byte)
      publickey = p_secret_to_public( change_argument_format(secret, form) )
      return change_result_format( publickey, form )
    end
def secret_to_public(secret, form=:byte)
      publickey = p_secret_to_public( change_argument_format(secret, form) )
      return change_result_format( publickey, form )
    end
calculate public key from secret