Code to encypt, decrypt json data

vitalitymobile

We use this to hide some sensitive data (level, score ..). Hope it will be useful to you!

local function convert(chars,dist,inv) local charInt = string.byte(chars); for i=1,dist do if(inv)then charInt = charInt - 1; else charInt = charInt + 1; end if(charInt<32)then if(inv)then charInt = 126; else charInt = 126; end elseif(charInt>126)then if(inv)then charInt = 32; else charInt = 32; end end end return string.char(charInt); end --Change this key, value from 0 to 255 local zendiosKey = {0,123,123,255,101}; local function crypt(str,inv) local enc= ""; for i=1,#str do if(#str-zendiosKey[5] >= i or not inv)then for inc=0,3 do if(i%4 == inc)then enc = enc .. convert(string.sub(str,i,i),zendiosKey[inc+1],inv); break; end end end end if(not inv)then for i=1,zendiosKey[5] do enc = enc .. string.char(math.random(32,126)); end end return enc; end   -- Sample usage: local data_json_sample = "{framework:'Gideros'}"; local encrypt_string = crypt(data_json_sample,false); print (encrypt_string) local decrypt_string = crypt(encrypt_string,true); print (decrypt_string)

Output:

Uploading finished. 8#Ta*"Yo/({'c&Fe/,U':s^>)O5;wT^*NDOkPDaRYE c)[rNfODjTAz[0C,fzZ"?%\,prXdq!,cZ4&0[<a href="http://forum.giderosmobile.com/profile/%26gt" rel="nofollow">@&gt</a>;B^llRZku-[F8,q&HV<T5=*l,;jukfZBq5r57S}%'   {framework:'Gideros'}

asakharov

you use it with your own server?
Scoreoid for example, use the DES encryption algorithm.
Anyone have an implementation of the algorithm DES for lua?)

vitalitymobile

Yes, my purpose is just want to hide some plain text.