ROBLOX Lua的低影响加密公式 [英] Low impact encryption formula for ROBLOX Lua

问题描述

在ROBLOX上的一个项目中，我正在寻找一种轻量级的纯Lua密码，该密码可以使用密钥相当快地加密和解密字符串.我一直在寻找，大多数解决方案都需要实现C库，或者对于我要找的东西来说太重了.我对加密不是很了解，但不应太明显，但也不要太复杂.是否有一个我不知所措的图书馆可以解决此问题?

In a project on ROBLOX, I am looking for a lightweight pure Lua cipher which can encrypt and decrypt a string fairly quickly using a key. I've been looking around, and most solutions require implementation of a C library, or are too heavy for what I'm looking for. I don't know too much about encryption, but it shouldn't be bluntly obvious, but not too complex. Is there a library out there that I'm somehow missing that would resolve this issue?

推荐答案

以下是轻量级纯Lua密码的示例.
它可以在没有外部库的情况下在Lua 5.1、5.2、5.3上运行.

Here is an example of a lightweight pure Lua cipher.
It works on Lua 5.1, 5.2, 5.3 without external libraries.

do
  -- This is your secret 67-bit key (any random bits are OK)
  local Key53 = 8186484168865098
  local Key14 = 4887

  local inv256

  function encode(str)
    if not inv256 then
      inv256 = {}
      for M = 0, 127 do
        local inv = -1
        repeat inv = inv + 2
        until inv * (2*M + 1) % 256 == 1
        inv256[M] = inv
      end
    end
    local K, F = Key53, 16384 + Key14
    return (str:gsub('.',
      function(m)
        local L = K % 274877906944  -- 2^38
        local H = (K - L) / 274877906944
        local M = H % 128
        m = m:byte()
        local c = (m * inv256[M] - (H - M) / 128) % 256
        K = L * F + H + c + m
        return ('%02x'):format(c)
      end
    ))
  end

  function decode(str)
    local K, F = Key53, 16384 + Key14
    return (str:gsub('%x%x',
      function(c)
        local L = K % 274877906944  -- 2^38
        local H = (K - L) / 274877906944
        local M = H % 128
        c = tonumber(c, 16)
        local m = (c + (H - M) / 128) * (2*M + 1) % 256
        K = L * F + H + c + m
        return string.char(m)
      end
    ))
  end
end

local s = 'Hello world'
print(       encode(s) ) --> 80897dfa1dd85ec196bc84
print(decode(encode(s))) --> Hello world

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