Lua simply excludes or encrypts files

Use Lua to simply encrypt or decrypt files. Note that the decrypted key is the reverse order of the encrypted key:

 1 require ‘bit‘ 2  3 local encode = function(inpath, outpath, key) 4     local inf = assert(io.open(inpath, "rb")) 5     local outf = assert(io.open(outpath, "wb")) 6  7     if (type(key) ~= "string") or (string.len(key) == 0) then 8         key = "x" 9     end10 11     local temp = nil12     local data = inf:read(1)13     while data do14         temp = bit.bxor(string.byte(data), string.byte(string.sub(key, 1, 1)))15         for i = 2, string.len(key) do16             temp = bit.bxor(temp, string.byte(string.sub(key, i, i)))17         end18         outf:write(string.char(temp))19         data = inf:read(1)20     end21 22     assert(inf:close())23     assert(outf:close())24 end25 26 local decode = function(inf, outf, key)27     encode(inf, outf, key)28 end29 30 ------------------------------------------------31 -- interface32 --33 transform_xor = {34     en = encode,35     de = decode,36 }

 

Lua simply excludes or encrypts files