BN_div_word
BN_ULONG t = BN_div_word(bl, 0x80L);
*lp = BN_div_word(t, BN_DEC_CONV);
ret = BN_div_word(tmp, w);
BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
ret_word = BN_div_word(ret, b_word);
BN_div_word(val, (BN_ULONG)*fact);
static BN_ULONG BN_div_word(BIGNUM *, BN_ULONG);