BN_sub_word
if (!BN_sub_word(a, 1))
if (!BN_sub_word(Ri, 1))
if (!BN_sub_word(Ri, 1))
if (!BN_sub_word(Ri, 1))
if (!BN_sub_word(A1, 1))
if (!BN_sub_word(t, 1))
i = BN_sub_word(a, w);
if (!BN_sub_word(max_g, 1))
int BN_sub_word(BIGNUM *a, BN_ULONG w);
BN_sub_word(x, 1);
BN_sub_word(n, (u_long)(-i));
BN_sub_word(n, (u_long)(-i));