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

local function crypt(str,k,inv)
    local enc= "";
    for i=1,#str do
        if(#str-k[5] >= i or not inv)then
            for inc=0,3 do
                if(i%4 == inc)then
                    enc = enc .. convert(string.sub(str,i,i),k[inc+1],inv);
                    break;
                end
            end
        end
    end
    if(not inv)then
        for i=1,k[5] do
            enc = enc .. string.char(math.random(32,126));
        end
    end
    return enc;
end