mul

static VALUE ossl_ec_point_mul(int argc, VALUE *argv, VALUE self)
{
    EC_POINT *point1, *point2;
    const EC_GROUP *group;
    VALUE group_v = rb_iv_get(self, "@group");
    VALUE bn_v1, bn_v2, r, points_v;
    BIGNUM *bn1 = NULL, *bn2 = NULL;

    Require_EC_POINT(self, point1);
    SafeRequire_EC_GROUP(group_v, group);

    r = rb_obj_alloc(cEC_POINT);
    ossl_ec_point_initialize(1, &group_v, r);
    Require_EC_POINT(r, point2);

    argc = rb_scan_args(argc, argv, "12", &bn_v1, &points_v, &bn_v2);

    if (rb_obj_is_kind_of(bn_v1, cBN)) {
        bn1 = GetBNPtr(bn_v1);
        if (argc >= 2) {
            bn2 = GetBNPtr(points_v);
        }
        if (EC_POINT_mul(group, point2, bn2, point1, bn1, ossl_bn_ctx) != 1)
            ossl_raise(eEC_POINT, "Multiplication failed");
    } else {
        size_t i, points_len, bignums_len;
        const EC_POINT **points;
        const BIGNUM **bignums;

        Check_Type(bn_v1, T_ARRAY);
        bignums_len = RARRAY_LEN(bn_v1);
        bignums = (const BIGNUM **)OPENSSL_malloc(bignums_len * (int)sizeof(BIGNUM *));

        for (i = 0; i < bignums_len; ++i) {
            bignums[i] = GetBNPtr(rb_ary_entry(bn_v1, i));
        }

        if (!rb_obj_is_kind_of(points_v, rb_cArray)) {
            OPENSSL_free((void *)bignums);
            rb_raise(rb_eTypeError, "Argument2 must be an array");
        }

        rb_ary_unshift(points_v, self);
        points_len = RARRAY_LEN(points_v);
        points = (const EC_POINT **)OPENSSL_malloc(points_len * (int)sizeof(EC_POINT *));

        for (i = 0; i < points_len; ++i) {
            Get_EC_POINT(rb_ary_entry(points_v, i), points[i]);
        }

        if (argc >= 3) {
            bn2 = GetBNPtr(bn_v2);
        }
        if (EC_POINTs_mul(group, point2, bn2, points_len, points, bignums, ossl_bn_ctx) != 1) {
            OPENSSL_free((void *)bignums);
            OPENSSL_free((void *)points);
            ossl_raise(eEC_POINT, "Multiplication failed");
        }
        OPENSSL_free((void *)bignums);
        OPENSSL_free((void *)points);
    }

    return r;
}