constant_time_eq_int_8
mask = constant_time_eq_int_8(0,
static ossl_inline unsigned char constant_time_eq_int_8(int a, int b);
if (a == b && !TEST_int_eq(constant_time_eq_int_8(a, b), CONSTTIME_TRUE_8))
if (a != b && !TEST_int_eq(constant_time_eq_int_8(a, b), CONSTTIME_FALSE_8))