Examples of java.security.cert.Certificate

java.security.cert.Certificate

Abstract class for managing a variety of identity certificates. An identity certificate is a binding of a principal to a public key which is vouched for by another principal. (A principal represents an entity such as an individual user, a group, or a corporation.)
This class is an abstraction for certificates that have different formats but important common uses. For example, different types of certificates, such as X.509 and PGP, share general certificate functionality (like encoding and verifying) and some types of information (like a public key).
X.509, PGP, and SDSI certificates can all be implemented by subclassing the Certificate class, even though they contain different sets of information, and they store and retrieve the information in different ways. @see X509Certificate @see CertificateFactory @author Hemma Prafullchandra @version 1.27, 04/21/06


    String alias = sanitizeX500Principal(issuer);


    try {
      if (keyStore.containsAlias(alias)) {
        Certificate certificate = keyStore.getCertificate(alias);
        if (Objects.equal(certificate, cert)) {
          return false;
        } else {
          log.warn("Found non-equal certificate with same alias [{}]: {} vs {}", new Object[] { alias,
              certificate, cert });

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    } catch (GeneralSecurityException e) {
      throw new IllegalArgumentException("Error reading certifificate", e);
    }


    if (certificateChain == null) {
      Certificate certificate;
      try {
        certificate = keyStore.getCertificate(alias);
      } catch (GeneralSecurityException e) {
        throw new IllegalArgumentException("Error reading certifificate", e);
      }

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      CertificateFactory cf = CertificateFactory.getInstance("X.509");
      Collection<? extends Certificate> c = cf.generateCertificates(is);
      Iterator<? extends Certificate> it = c.iterator();
      while(it.hasNext()) {
        Certificate cert = it.next();
        ks.setCertificateEntry(cert.getPublicKey().toString(), cert);
      }
      FileOutputStream tmpFOS = new FileOutputStream(TMP_KEYSTORE);
      try {
        ks.store(tmpFOS, new char[0]);
      } finally {

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     * @throws AnnotatedException if DSA parameters cannot be inherited.
     */
    protected static PublicKey getNextWorkingKey(List certs, int index)
        throws CertPathValidatorException
    {
        Certificate cert = (Certificate)certs.get(index);
        PublicKey pubKey = cert.getPublicKey();
        if (!(pubKey instanceof DSAPublicKey))
        {
            return pubKey;
        }
        DSAPublicKey dsaPubKey = (DSAPublicKey)pubKey;

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        }


        //
        // verify certificate
        //
        Certificate cert = store.getCertificateChain("private")[0];


        cert.verify(pubKey);
    }

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    }


    public Collection engineReadAll()
        throws StreamParsingException
    {
        Certificate     cert;
        List certs = new ArrayList();


        while ((cert = (Certificate)engineRead()) != null)
        {
            certs.add(cert);

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      return verifySCTSignatureOverBytes(sct, toVerify);
    } else {
      Preconditions.checkArgument(chain.size() >= 2,
          "Chain with PreCertificate must contain issuer.");
      // PreCertificate
      Certificate issuerCert = chain.get(1);
      IssuerInformation issuerInformation;
      if (!CertificateInfo.isPreCertificateSigningCert(issuerCert)) {
        issuerInformation = issuerInformationFromCertificateIssuer(issuerCert);
      } else {
        Preconditions.checkArgument(chain.size() >= 3,

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        {
            bIn = new ByteArrayInputStream(bytes);


            CertificateFactory  fact = CertificateFactory.getInstance("X.509", "BC");


            Certificate cert = fact.generateCertificate(bIn);


            PublicKey    k = cert.getPublicKey();
            // System.out.println(cert);
        }
        catch (Exception e)
        {
            fail(dump + System.getProperty("line.separator") + getName() + ": "+ id + " failed - exception " + e.toString(), e);

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        {
            bIn = new ByteArrayInputStream(bytes);


            CertificateFactory  fact = CertificateFactory.getInstance("X.509", "BC");


            Certificate cert = fact.generateCertificate(bIn);


            PublicKey    k = cert.getPublicKey();


            cert.verify(k);
            // System.out.println(cert);
        }
        catch (Exception e)
        {
            fail(dump + System.getProperty("line.separator") + getName() + ": "+ id + " failed - exception " + e.toString(), e);

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    private void pemTest()
        throws Exception
    {
        CertificateFactory cf = CertificateFactory.getInstance("X.509", "BC");


        Certificate cert = readPEMCert(cf, PEMData.CERTIFICATE_1);
        if (cert == null)
        {
            fail("PEM cert not read");
        }
        cert = readPEMCert(cf, "-----BEGIN CERTIFICATE-----" + PEMData.CERTIFICATE_2);

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