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basic_robot
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encrypt: fix of vulnerabilities and a bit of spice up with nonlinear nesting

master
rnd1 2017-07-18 14:54:15 +02:00
parent 6b955f9d63
commit 0084718815
1 changed files with 8 additions and 6 deletions
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14
commands.lua
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@ -1020,18 +1020,20 @@ basic_robot.commands.machine = {
local n = 16; -- range 0-255 (for just chat can use 32 - 132)
local m = 65;
local ret = "";input = input or "";
local block_offset = 0;
local rndseed = get_hash(password, 10^30);
_G.math.randomseed(rndseed);
local block_offset = 1+math.random(n);
local offset=1+math.random(n);
for i=1, string.len(input) do
local offset = math.random(n)^2+(i%n)^3; -- yay, nonlinearity is fun
offset = (offset^2)%n
offset = math.random(n+math.random(2+(i+offset+block_offset)^2)); -- yay, nested nonlinearity is fun and makes cryptanalysis 'trivial' hehe
if i%8 == 1 then -- every 8 characters new offset using strong hash function incorporation recent offset in nonlinear way
block_offset = get_hash(_G.minetest.get_password_hash("",i*(offset+1)..password .. (block_offset^2)),n);
if math.random(100)>50 then block_offset = block_offset*math.random(n)^2 end -- extra fun, why not
block_offset = get_hash(_G.minetest.get_password_hash("",i*(offset+1)..password .. (block_offset^2)),n); -- composite fun with more serious hash function
math.randomseed(rndseed+ block_offset) -- time for change of tune, can you keep up ? :)
if math.random(100)>50 then block_offset = block_offset*math.random(n*(1+block_offset)) end -- extra fun, why not
end
offset = offset + block_offset;
offset = (offset + block_offset)%n;
local c = string.byte(input,i)-m;
c = m+((c+offset*sgn) % n);
ret = ret .. string.char(c)