to_pem

static VALUE
ossl_x509req_to_pem(VALUE self)
{
    X509_REQ *req;
    BIO *out;

    GetX509Req(self, req);
    if (!(out = BIO_new(BIO_s_mem()))) {
        ossl_raise(eX509ReqError, NULL);
    }
    if (!PEM_write_bio_X509_REQ(out, req)) {
        BIO_free(out);
        ossl_raise(eX509ReqError, NULL);
    }

    return ossl_membio2str(out);
}