AIVD password check script - ropchain.com

#!/usr/bin/lua

--
-- password checker
--

function fa( x )
    return ((x + 3141592653))
end

function fb( x )
    return ((3*x + 1732050808))
end

function fc( x )
    return ((5*x + 2236067977))
end

function fd( x )
    return ((7*x + 2645751311))
end


function check( input )
    local t = {}
    local fl = {}
    local len = string.len(input)
    local res = true

    print("Let me check your password...")

    if len ~= 16 then
        print("Nope...")
        return
    end


    fl[1] = fa
    fl[2] = fb
    fl[3] = fc
    fl[4] = fd

    for i = 0,3 do
        t[i+1] = 16777216*string.byte(input, 4*i+1)
        t[i+1] = t[i+1] + 65536*string.byte(input, 4*i+2)
        t[i+1] = t[i+1] + 256*string.byte(input, 4*i+3)
        t[i+1] = t[i+1] + string.byte(input, 4*i+4)
    end

    for j = 1,10000000 do
        for i = 1, #t do
            local fi = fl[(t[i] % 4)+1]
            t[i] = fi(t[i]) % 4294967296
        end
    end


    if t[1] ~= 2066590424 then
        res = false
    end

    if t[2] ~= 4241186467 then
        res = false
    end

    if t[3] ~= 2486763883 then
        res = false
    end

    if t[4] ~= 2743090029 then
        res = false
    end

    if res == true then
        print("Congratulations!")
    else
        print("Nope...")
    end

end

--
-- Main program
--

io.write("Please enter the password: ")
io.flush()
pwd = io.read()
check( pwd )