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Asked: 2026-05-25T22:30:13+00:00

I need a small, like a two pieced, version of an AES encryption. I

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I need a small, like a two pieced, version of an AES encryption. I googled and found AES – Advanced Encryption Standard (source code), but the code seems to be written for Windows and I need a multi-platform one.

Is there any other small version of an AES encrpytion known or a fix for the used functions which seem to be unknown on Linux?

My compiler says that those are unknown functions:

./aes/AES.cpp:198:17: error: ‘_rotl’ was not declared in this scope
./aes/AES.cpp:608:20: error: ‘_rotr’ was not declared in this scope

I also got:

./aes/AES.cpp:764:34: error: ‘memset’ was not declared in this scope
./aes/AES.cpp:770:36: error: ‘memcpy’ was not declared in this scope

As those should be known, considering those includes:

#include "AES.hpp"
#include <assert.h>
#include <stdio.h>
#include <cstdio>
#include <cstdlib>
#include <fstream>
#include <iostream>
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1 Answer

  1. Editorial Team

    The reference implementation for AES can be found here: http://www.efgh.com/software/rijndael.htm. The main source file only includes <stdio.h>, but it doesn’t even depend on that; you should have absolutely no problem using it on any platform.

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