How to implement Lua script encryption and decryption?

There are several steps to implement script encryption and decryption in Lua.

1. Encryption script:
2. Compress the Lua script by removing unnecessary information such as spaces and comments.
3. Encrypt the compressed script using symmetric encryption algorithms like AES or asymmetric encryption algorithms like RSA.
4. Decrypt the script:
5. Decrypt the encrypted script using the corresponding decryption algorithm to restore the compressed script before encryption.
6. Decompress the decrypted script to restore the original Lua script.

Here is an example code demonstrating how to encrypt and decrypt Lua scripts using the AES algorithm.

-- 使用lua-aes加密库：https://github.com/RamiLego4Game/lua-aes
local aes = require("aes")

-- 压缩和加密Lua脚本
function encryptScript(script, key)
    -- 压缩脚本（这里省略压缩步骤）
    local compressedScript = compress(script)
    
    -- 加密脚本
    local encryptedScript = aes.encrypt(key, compressedScript)
    
    return encryptedScript
end

-- 解密和解压缩Lua脚本
function decryptScript(encryptedScript, key)
    -- 解密脚本
    local compressedScript = aes.decrypt(key, encryptedScript)
    
    -- 解压缩脚本（这里省略解压缩步骤）
    local script = decompress(compressedScript)
    
    return script
end

-- 示例使用：
local originalScript = [[
print("Hello, Lua!")
]]

local key = "encryption_key"

local encryptedScript = encryptScript(originalScript, key)
print("Encrypted Script:", encryptedScript)

local decryptedScript = decryptScript(encryptedScript, key)
print("Decrypted Script:", decryptedScript)

Please note that this is just a simple example code and does not fully implement compression and decompression functions. In actual use, you may need to use appropriate compression libraries to compress and decompress scripts. Similarly, encryption and decryption algorithms should be chosen based on actual requirements and ensure the security of the key.