1. Shared code for countermeasures
2, Coron's countermeasures
	new file:   Makefile
	new file:   cm_shared.c
	new file:   cm_shared.h
	new file:   cor_aes.c
	new file:   cor_aes.h
	modified:   rp_aes.c
	modified:   rp_aes.h