#include <stddef.h>

int timingsafe_memcmp(const void *s1, const void *s2, size_t n)

{

	unsigned int i, ret = -1;

	const unsigned char *b1 = s1;

	const unsigned char *b2 = s2;

	for(i = 0; i < n; i++)

		ret |= (b1[i] ^ b2[i]);

	return ret;

}