rot256

import sys

LIMB = 64

mod   = int(sys.argv[1]) if len(sys.argv) > 1 else 28948022309329048855892746252171976963363056481941560715954676764349967630337
name  = sys.argv[2] if len(sys.argv) > 2 else 'Fp'
bits  = int(mod).bit_length()
limbs = (bits + LIMB - 1) // LIMB
size  = limbs * LIMB