This files contain an implementation of AES in ComputerCraft (http://www.computercraft.info/) Lua.

aeslua.lua contains a simple API to encrypt and decrypt lua strings.

To encrypt the string "geheim" with the password "password" use:

os.loadAPI("aeslua"); cipher = aeslua.encrypt("password", "secret");

and to decrypt the string again:

plain = aeslua.decrypt("password", cipher);

You can also specify the key size and the encryption mode. For further examples look into the file spec/cipher_spec.lua.

To use AES directly, have a look at aeslua.lua and at the example usage in spec/cipher_spec.lua.

The implementation is rather optimized (it uses tables for most AES operations) but still cannot compete with AES written in other languages. Typical AES implementations reach several 100 MBit per second, this implementation only reaches 30 kB per second (245 kBit per second). The most plausible reason is the heavy reliance of AES on bit operations.

So if you need to encrypt much data with AES, do yourself a favor and use a C-Implementation. But if you only need to encrypt short strings and you have no control over the lua environment (like in games :-)) use this library.

AESLua is now build with Howl. Run /Howl build to build and run tests.