OpenSSL::PKey::EC::Group#seed

static VALUE ossl_ec_group_get_seed(VALUE self)
{
    EC_GROUP *group = NULL;
    size_t seed_len;

    GetECGroup(self, group);
    seed_len = EC_GROUP_get_seed_len(group);

    if (seed_len == 0)
        return Qnil;

    return rb_str_new((const char *)EC_GROUP_get0_seed(group), seed_len);
}