We need

* bn_mul_comba8
* bn_mul_comba4
* bn_mul_normal
* bn_mul_recursive

* bn_sqr_comba8
* bn_sqr_comba4
bn_sqr_normal -> BN_sqr
* bn_sqr_recursive

* bn_mul_low_recursive
* bn_mul_low_normal
* bn_mul_high

* bn_mul_part_recursive	# symetric but not power of 2

bn_mul_asymetric_recursive # uneven, but do the chop up.
