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# H3 Tiny AES128 in C
This is a small portable (and slow?) implementation of AES128 in C.
AES128 ECB is symmetric, so you use the same function for encrypting and decrypting.
The module uses just a bit more than 200 bytes of RAM and 1K ROM when compiled for ARM.
YMMV depending on target platform and optimization skills of your compiler.
GCC size output when compiled for ARM:
$ arm-none-eabi-gcc -Os -c aes.c -o aes.o
$ size aes.o
text data bss dec hex filename
1079 0 204 1283 503 aes.o
$ arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.8.3 20131129 (release) [ARM/embedded-4_8-branch revision 205641]
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The implementation is verified against the data in National Institute of Standards and Technology Special Publication 800-38A 2001 ED.