CertificateRequest cr = new CertificateRequest(u, Base64.getEncoder().encodeToString(res), "challange");
cr.update(CertificateRequest.DEFAULT_CN, Digest.SHA512.toString(), "client", null, "", "email:" + u.getEmail(), resp.getWriter(), req);
CertificateRequest cr = new CertificateRequest(u, Base64.getEncoder().encodeToString(res), "challange");
cr.update(CertificateRequest.DEFAULT_CN, Digest.SHA512.toString(), "client", null, "", "email:" + u.getEmail(), resp.getWriter(), req);