Examples with DecodedPkiMessage org.xipki.scep.message.DecodedPkiMessage used on opensource projects

Example 1 with DecodedPkiMessage

use of org.xipki.scep.message.DecodedPkiMessage in project xipki by xipki.

the class ScepResponder method servicePkiOperation0.

private PkiMessage servicePkiOperation0(DecodedPkiMessage req, AuditEvent event) throws MessageDecodingException, CaException {
    TransactionId tid = req.getTransactionId();
    PkiMessage rep = new PkiMessage(tid, MessageType.CertRep, Nonce.randomNonce());
    rep.setPkiStatus(PkiStatus.SUCCESS);
    rep.setRecipientNonce(req.getSenderNonce());
    if (req.getFailureMessage() != null) {
        return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
    }
    Boolean bo = req.isSignatureValid();
    if (bo != null && !bo.booleanValue()) {
        return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badMessageCheck);
    }
    bo = req.isDecryptionSuccessful();
    if (bo != null && !bo.booleanValue()) {
        return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
    }
    Date signingTime = req.getSigningTime();
    if (maxSigningTimeBiasInMs > 0) {
        boolean isTimeBad = false;
        if (signingTime == null) {
            isTimeBad = true;
        } else {
            long now = System.currentTimeMillis();
            long diff = now - signingTime.getTime();
            if (diff < 0) {
                diff = -1 * diff;
            }
            isTimeBad = diff > maxSigningTimeBiasInMs;
        }
        if (isTimeBad) {
            return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badTime);
        }
    }
    // check the digest algorithm
    String oid = req.getDigestAlgorithm().getId();
    ScepHashAlgo hashAlgo = ScepHashAlgo.forNameOrOid(oid);
    if (hashAlgo == null) {
        LOG.warn("tid={}: unknown digest algorithm {}", tid, oid);
        return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badAlg);
    }
    // end if
    boolean supported = false;
    if (hashAlgo == ScepHashAlgo.SHA1) {
        if (caCaps.containsCapability(CaCapability.SHA1)) {
            supported = true;
        }
    } else if (hashAlgo == ScepHashAlgo.SHA256) {
        if (caCaps.containsCapability(CaCapability.SHA256)) {
            supported = true;
        }
    } else if (hashAlgo == ScepHashAlgo.SHA512) {
        if (caCaps.containsCapability(CaCapability.SHA512)) {
            supported = true;
        }
    } else if (hashAlgo == ScepHashAlgo.MD5) {
        if (control.isUseInsecureAlg()) {
            supported = true;
        }
    }
    if (!supported) {
        LOG.warn("tid={}: unsupported digest algorithm {}", tid, oid);
        return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badAlg);
    }
    // end if
    // check the content encryption algorithm
    ASN1ObjectIdentifier encOid = req.getContentEncryptionAlgorithm();
    if (CMSAlgorithm.DES_EDE3_CBC.equals(encOid)) {
        if (!caCaps.containsCapability(CaCapability.DES3)) {
            LOG.warn("tid={}: encryption with DES3 algorithm is not permitted", tid, encOid);
            return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badAlg);
        }
    } else if (AES_ENC_ALGS.contains(encOid)) {
        if (!caCaps.containsCapability(CaCapability.AES)) {
            LOG.warn("tid={}: encryption with AES algorithm {} is not permitted", tid, encOid);
            return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badAlg);
        }
    } else if (CMSAlgorithm.DES_CBC.equals(encOid)) {
        if (!control.isUseInsecureAlg()) {
            LOG.warn("tid={}: encryption with DES algorithm {} is not permitted", tid, encOid);
            return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badAlg);
        }
    } else {
        LOG.warn("tid={}: encryption with algorithm {} is not permitted", tid, encOid);
        return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badAlg);
    }
    if (rep.getPkiStatus() == PkiStatus.FAILURE) {
        return rep;
    }
    MessageType messageType = req.getMessageType();
    switch(messageType) {
        case PKCSReq:
            boolean selfSigned = req.getSignatureCert().getIssuerX500Principal().equals(req.getSignatureCert().getIssuerX500Principal());
            CertificationRequest csr = CertificationRequest.getInstance(req.getMessageData());
            if (selfSigned) {
                X500Name name = X500Name.getInstance(req.getSignatureCert().getSubjectX500Principal().getEncoded());
                if (!name.equals(csr.getCertificationRequestInfo().getSubject())) {
                    LOG.warn("tid={}: self-signed cert.subject != CSR.subject", tid);
                    return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
                }
            }
            String challengePwd = getChallengePassword(csr.getCertificationRequestInfo());
            if (challengePwd == null || !control.getSecret().equals(challengePwd)) {
                LOG.warn("challengePassword is not trusted");
                return buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
            }
            Certificate cert;
            try {
                cert = caEmulator.generateCert(csr);
            } catch (Exception ex) {
                throw new CaException("system failure: " + ex.getMessage(), ex);
            }
            if (cert != null && control.isPendingCert()) {
                rep.setPkiStatus(PkiStatus.PENDING);
            } else if (cert != null) {
                ContentInfo messageData = createSignedData(cert);
                rep.setMessageData(messageData);
            } else {
                buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badCertId);
            }
            break;
        case CertPoll:
            IssuerAndSubject is = IssuerAndSubject.getInstance(req.getMessageData());
            cert = caEmulator.pollCert(is.getIssuer(), is.getSubject());
            if (cert != null) {
                rep.setMessageData(createSignedData(cert));
            } else {
                buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badCertId);
            }
            break;
        case GetCert:
            IssuerAndSerialNumber isn = IssuerAndSerialNumber.getInstance(req.getMessageData());
            cert = caEmulator.getCert(isn.getName(), isn.getSerialNumber().getValue());
            if (cert != null) {
                rep.setMessageData(createSignedData(cert));
            } else {
                buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badCertId);
            }
            break;
        case RenewalReq:
            if (!caCaps.containsCapability(CaCapability.Renewal)) {
                buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
            } else {
                csr = CertificationRequest.getInstance(req.getMessageData());
                try {
                    cert = caEmulator.generateCert(csr);
                } catch (Exception ex) {
                    throw new CaException("system failure: " + ex.getMessage(), ex);
                }
                if (cert != null) {
                    rep.setMessageData(createSignedData(cert));
                } else {
                    rep.setPkiStatus(PkiStatus.FAILURE);
                    rep.setFailInfo(FailInfo.badCertId);
                }
            }
            break;
        case UpdateReq:
            if (!caCaps.containsCapability(CaCapability.Update)) {
                buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
            } else {
                csr = CertificationRequest.getInstance(req.getMessageData());
                try {
                    cert = caEmulator.generateCert(csr);
                } catch (Exception ex) {
                    throw new CaException("system failure: " + ex.getMessage(), ex);
                }
                if (cert != null) {
                    rep.setMessageData(createSignedData(cert));
                } else {
                    buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badCertId);
                }
            }
            break;
        case GetCRL:
            isn = IssuerAndSerialNumber.getInstance(req.getMessageData());
            CertificateList crl;
            try {
                crl = caEmulator.getCrl(isn.getName(), isn.getSerialNumber().getValue());
            } catch (Exception ex) {
                throw new CaException("system failure: " + ex.getMessage(), ex);
            }
            if (crl != null) {
                rep.setMessageData(createSignedData(crl));
            } else {
                buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badCertId);
            }
            break;
        default:
            buildPkiMessage(rep, PkiStatus.FAILURE, FailInfo.badRequest);
    }
    return rep;
}

Example 2 with DecodedPkiMessage

use of org.xipki.scep.message.DecodedPkiMessage in project xipki by xipki.

the class Client method decode.

private DecodedPkiMessage decode(CMSSignedData pkiMessage, PrivateKey recipientKey, X509Certificate recipientCert) throws ScepClientException {
    DecodedPkiMessage resp;
    try {
        resp = DecodedPkiMessage.decode(pkiMessage, recipientKey, recipientCert, responseSignerCerts);
    } catch (MessageDecodingException ex) {
        throw new ScepClientException(ex);
    }
    if (resp.getFailureMessage() != null) {
        throw new ScepClientException("Error: " + resp.getFailureMessage());
    }
    Boolean bo = resp.isSignatureValid();
    if (bo != null && !bo.booleanValue()) {
        throw new ScepClientException("Signature is invalid");
    }
    bo = resp.isDecryptionSuccessful();
    if (bo != null && !bo.booleanValue()) {
        throw new ScepClientException("Decryption failed");
    }
    Date signingTime = resp.getSigningTime();
    long maxSigningTimeBias = getMaxSigningTimeBiasInMs();
    if (maxSigningTimeBias > 0) {
        if (signingTime == null) {
            throw new ScepClientException("CMS signingTime attribute is not present");
        }
        long now = System.currentTimeMillis();
        long diff = now - signingTime.getTime();
        if (diff < 0) {
            diff = -1 * diff;
        }
        if (diff > maxSigningTimeBias) {
            throw new ScepClientException("CMS signingTime is out of permitted period");
        }
    }
    if (!resp.getSignatureCert().equals(authorityCertStore.getSignatureCert())) {
        throw new ScepClientException("the signature certificate must not be trusted");
    }
    return resp;
}

Example 3 with DecodedPkiMessage

use of org.xipki.scep.message.DecodedPkiMessage in project xipki by xipki.

the class ScepImpl method servicePkiOperation.

public ContentInfo servicePkiOperation(CMSSignedData requestContent, String certProfileName, String msgId, AuditEvent event) throws MessageDecodingException, OperationException {
    CaStatus status = getStatus();
    if (CaStatus.ACTIVE != status) {
        LOG.warn("SCEP {} is not active", caIdent);
        throw new OperationException(ErrorCode.SYSTEM_UNAVAILABLE);
    }
    DecodedPkiMessage req = DecodedPkiMessage.decode(requestContent, envelopedDataDecryptor, null);
    PkiMessage rep = servicePkiOperation0(requestContent, req, certProfileName, msgId, event);
    audit(event, CaAuditConstants.NAME_SCEP_pkiStatus, rep.getPkiStatus().toString());
    if (rep.getPkiStatus() == PkiStatus.FAILURE) {
        event.setStatus(AuditStatus.FAILED);
    }
    if (rep.getFailInfo() != null) {
        audit(event, CaAuditConstants.NAME_SCEP_failInfo, rep.getFailInfo().toString());
    }
    return encodeResponse(rep, req);
}

Example 4 with DecodedPkiMessage

use of org.xipki.scep.message.DecodedPkiMessage in project xipki by xipki.

the class ScepImpl method servicePkiOperation0.

// method servicePkiOperation
private PkiMessage servicePkiOperation0(CMSSignedData requestContent, DecodedPkiMessage req, String certProfileName, String msgId, AuditEvent event) throws MessageDecodingException, OperationException {
    ParamUtil.requireNonNull("requestContent", requestContent);
    ParamUtil.requireNonNull("req", req);
    String tid = req.getTransactionId().getId();
    // verify and decrypt the request
    audit(event, CaAuditConstants.NAME_tid, tid);
    if (req.getFailureMessage() != null) {
        audit(event, CaAuditConstants.NAME_SCEP_failureMessage, req.getFailureMessage());
    }
    Boolean bo = req.isSignatureValid();
    if (bo != null && !bo.booleanValue()) {
        audit(event, CaAuditConstants.NAME_SCEP_signature, "invalid");
    }
    bo = req.isDecryptionSuccessful();
    if (bo != null && !bo.booleanValue()) {
        audit(event, CaAuditConstants.NAME_SCEP_decryption, "failed");
    }
    PkiMessage rep = new PkiMessage(req.getTransactionId(), MessageType.CertRep, Nonce.randomNonce());
    rep.setRecipientNonce(req.getSenderNonce());
    if (req.getFailureMessage() != null) {
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(FailInfo.badRequest);
        return rep;
    }
    bo = req.isSignatureValid();
    if (bo != null && !bo.booleanValue()) {
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(FailInfo.badMessageCheck);
        return rep;
    }
    bo = req.isDecryptionSuccessful();
    if (bo != null && !bo.booleanValue()) {
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(FailInfo.badRequest);
        return rep;
    }
    Date signingTime = req.getSigningTime();
    if (maxSigningTimeBiasInMs > 0) {
        boolean isTimeBad = false;
        if (signingTime == null) {
            isTimeBad = true;
        } else {
            long now = System.currentTimeMillis();
            long diff = now - signingTime.getTime();
            if (diff < 0) {
                diff = -1 * diff;
            }
            isTimeBad = diff > maxSigningTimeBiasInMs;
        }
        if (isTimeBad) {
            rep.setPkiStatus(PkiStatus.FAILURE);
            rep.setFailInfo(FailInfo.badTime);
            return rep;
        }
    }
    // end if
    // check the digest algorithm
    String oid = req.getDigestAlgorithm().getId();
    ScepHashAlgo hashAlgo = ScepHashAlgo.forNameOrOid(oid);
    if (hashAlgo == null) {
        LOG.warn("tid={}: unknown digest algorithm {}", tid, oid);
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(FailInfo.badAlg);
        return rep;
    }
    boolean supported = false;
    if (hashAlgo == ScepHashAlgo.SHA1) {
        if (caCaps.containsCapability(CaCapability.SHA1)) {
            supported = true;
        }
    } else if (hashAlgo == ScepHashAlgo.SHA256) {
        if (caCaps.containsCapability(CaCapability.SHA256)) {
            supported = true;
        }
    } else if (hashAlgo == ScepHashAlgo.SHA512) {
        if (caCaps.containsCapability(CaCapability.SHA512)) {
            supported = true;
        }
    }
    if (!supported) {
        LOG.warn("tid={}: unsupported digest algorithm {}", tid, oid);
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(FailInfo.badAlg);
        return rep;
    }
    // check the content encryption algorithm
    ASN1ObjectIdentifier encOid = req.getContentEncryptionAlgorithm();
    if (CMSAlgorithm.DES_EDE3_CBC.equals(encOid)) {
        if (!caCaps.containsCapability(CaCapability.DES3)) {
            LOG.warn("tid={}: encryption with DES3 algorithm is not permitted", tid, encOid);
            rep.setPkiStatus(PkiStatus.FAILURE);
            rep.setFailInfo(FailInfo.badAlg);
            return rep;
        }
    } else if (AES_ENC_ALGOS.contains(encOid)) {
        if (!caCaps.containsCapability(CaCapability.AES)) {
            LOG.warn("tid={}: encryption with AES algorithm {} is not permitted", tid, encOid);
            rep.setPkiStatus(PkiStatus.FAILURE);
            rep.setFailInfo(FailInfo.badAlg);
            return rep;
        }
    } else {
        LOG.warn("tid={}: encryption with algorithm {} is not permitted", tid, encOid);
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(FailInfo.badAlg);
        return rep;
    }
    X509Ca ca;
    try {
        ca = caManager.getX509Ca(caIdent);
    } catch (CaMgmtException ex) {
        LogUtil.error(LOG, ex, tid + "=" + tid + ",could not get X509CA");
        throw new OperationException(ErrorCode.SYSTEM_FAILURE, ex);
    }
    X500Name caX500Name = ca.getCaInfo().getCert().getSubjectAsX500Name();
    try {
        SignedData signedData;
        MessageType mt = req.getMessageType();
        audit(event, CaAuditConstants.NAME_SCEP_messageType, mt.toString());
        switch(mt) {
            case PKCSReq:
            case RenewalReq:
            case UpdateReq:
                CertificationRequest csr = CertificationRequest.getInstance(req.getMessageData());
                X500Name reqSubject = csr.getCertificationRequestInfo().getSubject();
                if (LOG.isInfoEnabled()) {
                    LOG.info("tid={}, subject={}", tid, X509Util.getRfc4519Name(reqSubject));
                }
                try {
                    ca.checkCsr(csr);
                } catch (OperationException ex) {
                    LogUtil.warn(LOG, ex, "tid=" + tid + " POPO verification failed");
                    throw FailInfoException.BAD_MESSAGE_CHECK;
                }
                CertificationRequestInfo csrReqInfo = csr.getCertificationRequestInfo();
                X509Certificate reqSignatureCert = req.getSignatureCert();
                X500Principal reqSigCertSubject = reqSignatureCert.getSubjectX500Principal();
                boolean selfSigned = reqSigCertSubject.equals(reqSignatureCert.getIssuerX500Principal());
                if (selfSigned) {
                    X500Name tmp = X500Name.getInstance(reqSigCertSubject.getEncoded());
                    if (!tmp.equals(csrReqInfo.getSubject())) {
                        LOG.warn("tid={}, self-signed identityCert.subject != csr.subject");
                        throw FailInfoException.BAD_REQUEST;
                    }
                }
                if (X509Util.getCommonName(csrReqInfo.getSubject()) == null) {
                    throw new OperationException(ErrorCode.BAD_CERT_TEMPLATE, "tid=" + tid + ": no CommonName in requested subject");
                }
                NameId userIdent = null;
                String challengePwd = CaUtil.getChallengePassword(csrReqInfo);
                if (challengePwd != null) {
                    String[] strs = challengePwd.split(":");
                    if (strs == null || strs.length != 2) {
                        LOG.warn("tid={}: challengePassword does not have the format <user>:<password>", tid);
                        throw FailInfoException.BAD_REQUEST;
                    }
                    String user = strs[0];
                    String password = strs[1];
                    userIdent = ca.authenticateUser(user, password.getBytes());
                    if (userIdent == null) {
                        LOG.warn("tid={}: could not authenticate user {}", tid, user);
                        throw FailInfoException.BAD_REQUEST;
                    }
                }
                if (selfSigned) {
                    if (MessageType.PKCSReq != mt) {
                        LOG.warn("tid={}: self-signed certificate is not permitted for" + " messageType {}", tid, mt);
                        throw FailInfoException.BAD_REQUEST;
                    }
                    if (userIdent == null) {
                        LOG.warn("tid={}: could not extract user & password from challengePassword" + ", which are required for self-signed signature certificate", tid);
                        throw FailInfoException.BAD_REQUEST;
                    }
                } else {
                    // certificate is known by the CA
                    if (userIdent == null) {
                        // up to draft-nourse-scep-23 the client sends all messages to enroll
                        // certificate via MessageType PKCSReq
                        KnowCertResult knowCertRes = ca.knowsCertificate(reqSignatureCert);
                        if (!knowCertRes.isKnown()) {
                            LOG.warn("tid={}: signature certificate is not trusted by the CA", tid);
                            throw FailInfoException.BAD_REQUEST;
                        }
                        Integer userId = knowCertRes.getUserId();
                        if (userId == null) {
                            LOG.warn("tid={}: could not extract user from the signature cert", tid);
                            throw FailInfoException.BAD_REQUEST;
                        }
                        userIdent = ca.getUserIdent(userId);
                    }
                // end if
                }
                // end if
                ByUserRequestorInfo requestor = ca.getByUserRequestor(userIdent);
                checkUserPermission(requestor, certProfileName);
                byte[] tidBytes = getTransactionIdBytes(tid);
                Extensions extensions = CaUtil.getExtensions(csrReqInfo);
                CertTemplateData certTemplateData = new CertTemplateData(csrReqInfo.getSubject(), csrReqInfo.getSubjectPublicKeyInfo(), (Date) null, (Date) null, extensions, certProfileName);
                X509CertificateInfo cert = ca.generateCertificate(certTemplateData, requestor, RequestType.SCEP, tidBytes, msgId);
                /* Don't save SCEP message, since it contains password in plaintext
          if (ca.getCaInfo().isSaveRequest() && cert.getCert().getCertId() != null) {
            byte[] encodedRequest;
            try {
              encodedRequest = requestContent.getEncoded();
            } catch (IOException ex) {
              LOG.warn("could not encode request");
              encodedRequest = null;
            }
            if (encodedRequest != null) {
              long reqId = ca.addRequest(encodedRequest);
              ca.addRequestCert(reqId, cert.getCert().getCertId());
            }
          }*/
                signedData = buildSignedData(cert.getCert().getCert());
                break;
            case CertPoll:
                IssuerAndSubject is = IssuerAndSubject.getInstance(req.getMessageData());
                audit(event, CaAuditConstants.NAME_issuer, X509Util.getRfc4519Name(is.getIssuer()));
                audit(event, CaAuditConstants.NAME_subject, X509Util.getRfc4519Name(is.getSubject()));
                ensureIssuedByThisCa(caX500Name, is.getIssuer());
                signedData = pollCert(ca, is.getSubject(), req.getTransactionId());
                break;
            case GetCert:
                IssuerAndSerialNumber isn = IssuerAndSerialNumber.getInstance(req.getMessageData());
                BigInteger serial = isn.getSerialNumber().getPositiveValue();
                audit(event, CaAuditConstants.NAME_issuer, X509Util.getRfc4519Name(isn.getName()));
                audit(event, CaAuditConstants.NAME_serial, LogUtil.formatCsn(serial));
                ensureIssuedByThisCa(caX500Name, isn.getName());
                signedData = getCert(ca, isn.getSerialNumber().getPositiveValue());
                break;
            case GetCRL:
                isn = IssuerAndSerialNumber.getInstance(req.getMessageData());
                serial = isn.getSerialNumber().getPositiveValue();
                audit(event, CaAuditConstants.NAME_issuer, X509Util.getRfc4519Name(isn.getName()));
                audit(event, CaAuditConstants.NAME_serial, LogUtil.formatCsn(serial));
                ensureIssuedByThisCa(caX500Name, isn.getName());
                signedData = getCrl(ca, serial);
                break;
            default:
                LOG.error("unknown SCEP messageType '{}'", req.getMessageType());
                throw FailInfoException.BAD_REQUEST;
        }
        // end switch<
        ContentInfo ci = new ContentInfo(CMSObjectIdentifiers.signedData, signedData);
        rep.setMessageData(ci);
        rep.setPkiStatus(PkiStatus.SUCCESS);
    } catch (FailInfoException ex) {
        LogUtil.error(LOG, ex);
        rep.setPkiStatus(PkiStatus.FAILURE);
        rep.setFailInfo(ex.getFailInfo());
    }
    return rep;
}

Example 5 with DecodedPkiMessage

use of org.xipki.scep.message.DecodedPkiMessage in project xipki by xipki.

the class Client method scepGetCert.

public List<X509Certificate> scepGetCert(PrivateKey identityKey, X509Certificate identityCert, X500Name issuer, BigInteger serialNumber) throws ScepClientException {
    ScepUtil.requireNonNull("identityKey", identityKey);
    ScepUtil.requireNonNull("identityCert", identityCert);
    ScepUtil.requireNonNull("issuer", issuer);
    ScepUtil.requireNonNull("serialNumber", serialNumber);
    initIfNotInited();
    PkiMessage request = new PkiMessage(TransactionId.randomTransactionId(), MessageType.GetCert);
    IssuerAndSerialNumber isn = new IssuerAndSerialNumber(issuer, serialNumber);
    request.setMessageData(isn);
    ContentInfo envRequest = encryptThenSign(request, identityKey, identityCert);
    ScepHttpResponse httpResp = httpSend(Operation.PKIOperation, envRequest);
    CMSSignedData cmsSignedData = parsePkiMessage(httpResp.getContentBytes());
    DecodedPkiMessage response = decode(cmsSignedData, identityKey, identityCert);
    if (response.getPkiStatus() != PkiStatus.SUCCESS) {
        throw new ScepClientException("server returned " + response.getPkiStatus());
    }
    ContentInfo messageData = ContentInfo.getInstance(response.getMessageData());
    try {
        return ScepUtil.getCertsFromSignedData(SignedData.getInstance(messageData.getContent()));
    } catch (CertificateException ex) {
        throw new ScepClientException(ex.getMessage(), ex);
    }
}