#define AES_KEYLEN bites with SAMD5 compiler

Hi,

your tiny AES works flawlessly on an Arduino Feather M4 Express (AVR SAMD5 architecture).
But the #define AES_KEYLEN get's redefined in the include files from the compiler. The SAMD5 has a hardware AES module and defines it's own AES_KEYLEN.

So maybe rename some things in this library?

BR

Start by inspecting the library's include files and every use of AES_KEYLEN, then compare them with the SAMD5 compiler definitions. Rename the colliding library symbols consistently and verify that AES-128/192/256 builds and existing tests still work without redefinition warnings.

Written by the indexing model from the issue text.