BN_mod_add_quick
if (!BN_mod_add_quick(tmp2, tmp2, x, &group->field))
if (!BN_mod_add_quick(tmp1, tmp1, tmp2, &group->field))
if (!BN_mod_add_quick(tmp1, tmp1, tmp2, &group->field))
if (!BN_mod_add_quick(tmp1, tmp1, &group->b, &group->field))
if (!BN_mod_add_quick(tmp, tmp, Z4, p))
if (!BN_mod_add_quick(rh, rh, tmp, p))
if (!BN_mod_add_quick(rh, rh, tmp, p))
if (!BN_mod_add_quick(rh, rh, &group->a, p))
if (!BN_mod_add_quick(rh, rh, &group->b, p))
if (!BN_mod_add_quick(n1, n1, n3, p))
if (!BN_mod_add_quick(n2, n2, n4, p))
if (!BN_mod_add_quick(n0, n0, n1, p))
if (!BN_mod_add_quick(n1, n0, &group->a, p))
if (!BN_mod_add_quick(n0, &a->X, n1, p))
if (!BN_mod_add_quick(n1, n0, n1, p))
if (!BN_mod_add_quick(n0, n0, n1, p))
if (!BN_mod_add_quick(n1, n1, n0, p))
int BN_mod_add_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m);