Crystal Kell AES

Question

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

Is there any other small version of the well-known name AES or a fix for the functions used that seem to be unknown on Linux?

My compiler says these 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 

Because they should be known, given that they include:

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

Answer 1

The reference implementation for AES can be found here: http://www.efgh.com/software/rijndael.htm . The main source file includes only <stdio.h> , but it does not even depend on it; You should not have any problems using it on any platform.

Answer 2

Use a well-tested cryptographic library, such as cryptlib or OpenSSL , instead of some random snippets found on the 40th page of search results. Depending on what you are doing, you probably should also use higher level constructors, not AES directly.

Answer 3

since it goes high in Google's search for this error, here is what I did for my program, which refused to compile on the x64 CentOS system, which ia32intrin.h lacks:

 #if !defined(_rotr) && (defined(__i386__) || defined(__x86_64__)) static inline unsigned int _rotr(unsigned int n, const int count) { asm volatile ( "rorl %1, %0;" : "=r" (n) : "nI" (count), "0" (n) ); return n; } #endif 

as mentioned in avakar, you need to enable cstring or alternatively string.h to get memset and memcpy.

the code for _rotl would be identical, except for the operation code mnemonics, which would be roll .