installed, not sure where to find it

[augisbud]

i installed luacrypto, but when i run my program i still get

root@LPG1:~# lua a.lua
lua: a.lua:1: module 'crypto' not found:
        no field package.preload['crypto']
        no file '/usr/local/share/lua/5.2/crypto.lua'
        no file '/usr/local/share/lua/5.2/crypto/init.lua'
        no file '/usr/local/lib/lua/5.2/crypto.lua'
        no file '/usr/local/lib/lua/5.2/crypto/init.lua'
        no file '/usr/share/lua/5.2/crypto.lua'
        no file '/usr/share/lua/5.2/crypto/init.lua'
        no file './crypto.lua'
        no file '/usr/local/lib/lua/5.2/crypto.so'
        no file '/usr/lib/x86_64-linux-gnu/lua/5.2/crypto.so'
        no file '/usr/lib/lua/5.2/crypto.so'
        no file '/usr/local/lib/lua/5.2/loadall.so'
        no file './crypto.so'
stack traceback:
        [C]: in function 'require'
        a.lua:1: in main chunk
        [C]: in ?

ideas?