How to import hmac to lua script?

[yukha-dw]

Hello, is there any way to install and import lua modules?

I want to import hmac module inside lua script so I can create a new signature for every request, but i got this error instead

./script.lua: ./extension.lua:1: module 'hmac' not found:
        no field package.preload['hmac']
        no file './hmac.lua'
        no file '/usr/local/share/luajit-2.0.3/hmac.lua'
        no file '/usr/local/share/lua/5.1/hmac.lua'
        no file '/usr/local/share/lua/5.1/hmac/init.lua'
        no file './hmac.so'
        no file '/usr/local/lib/lua/5.1/hmac.so'
        no file '/usr/local/lib/lua/5.1/loadall.so'