OpenSSL::PKey::EC::Group#to_text

static VALUE ossl_ec_group_to_text(VALUE self)
{
    EC_GROUP *group;
    BIO *out;
    VALUE str;

    GetECGroup(self, group);
    if (!(out = BIO_new(BIO_s_mem()))) {
        ossl_raise(eEC_GROUP, "BIO_new(BIO_s_mem())");
    }
    if (!ECPKParameters_print(out, group, 0)) {
        BIO_free(out);
        ossl_raise(eEC_GROUP, NULL);
    }
    str = ossl_membio2str(out);

    return str;
}