Examples with Time org.spongycastle.asn1.x509.Time used on opensource projects

Example 1 with Time

use of org.spongycastle.asn1.x509.Time in project Openfire by igniterealtime.

the class CertificateManager method createX509V3Certificate.

/**
     * Creates an X509 version3 certificate.
     *
     * @param kp           KeyPair that keeps the public and private keys for the new certificate.
     * @param days       time to live
     * @param issuerBuilder     IssuerDN builder
     * @param subjectBuilder    SubjectDN builder
     * @param domain       Domain of the server.
     * @param signAlgoritm Signature algorithm. This can be either a name or an OID.
     * @return X509 V3 Certificate
     * @throws GeneralSecurityException
     * @throws IOException
     */
public static synchronized X509Certificate createX509V3Certificate(KeyPair kp, int days, X500NameBuilder issuerBuilder, X500NameBuilder subjectBuilder, String domain, String signAlgoritm) throws GeneralSecurityException, IOException {
    PublicKey pubKey = kp.getPublic();
    PrivateKey privKey = kp.getPrivate();
    byte[] serno = new byte[8];
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    random.setSeed((new Date().getTime()));
    random.nextBytes(serno);
    BigInteger serial = (new java.math.BigInteger(serno)).abs();
    X500Name issuerDN = issuerBuilder.build();
    X500Name subjectDN = subjectBuilder.build();
    // builder
    JcaX509v3CertificateBuilder certBuilder = new //
    JcaX509v3CertificateBuilder(//
    issuerDN, //
    serial, //
    new Date(), //
    new Date(System.currentTimeMillis() + days * (1000L * 60 * 60 * 24)), //
    subjectDN, //
    pubKey);
    // add subjectAlternativeName extension
    boolean critical = subjectDN.getRDNs().length == 0;
    ASN1Sequence othernameSequence = new DERSequence(new ASN1Encodable[] { new ASN1ObjectIdentifier("1.3.6.1.5.5.7.8.5"), new DERUTF8String(domain) });
    GeneralName othernameGN = new GeneralName(GeneralName.otherName, othernameSequence);
    GeneralNames subjectAltNames = new GeneralNames(new GeneralName[] { othernameGN });
    certBuilder.addExtension(Extension.subjectAlternativeName, critical, subjectAltNames);
    // add keyIdentifiers extensions
    JcaX509ExtensionUtils utils = new JcaX509ExtensionUtils();
    certBuilder.addExtension(Extension.subjectKeyIdentifier, false, utils.createSubjectKeyIdentifier(pubKey));
    certBuilder.addExtension(Extension.authorityKeyIdentifier, false, utils.createAuthorityKeyIdentifier(pubKey));
    try {
        // build the certificate
        ContentSigner signer = new JcaContentSignerBuilder(signAlgoritm).build(privKey);
        X509CertificateHolder cert = certBuilder.build(signer);
        // verify the validity
        if (!cert.isValidOn(new Date())) {
            throw new GeneralSecurityException("Certificate validity not valid");
        }
        // verify the signature (self-signed)
        ContentVerifierProvider verifierProvider = new JcaContentVerifierProviderBuilder().build(pubKey);
        if (!cert.isSignatureValid(verifierProvider)) {
            throw new GeneralSecurityException("Certificate signature not valid");
        }
        return new JcaX509CertificateConverter().getCertificate(cert);
    } catch (OperatorCreationException | CertException e) {
        throw new GeneralSecurityException(e);
    }
}

Example 2 with Time

use of org.spongycastle.asn1.x509.Time in project android_frameworks_base by ResurrectionRemix.

the class AndroidKeyStoreKeyPairGeneratorSpi method generateSelfSignedCertificateWithFakeSignature.

@SuppressWarnings("deprecation")
private X509Certificate generateSelfSignedCertificateWithFakeSignature(PublicKey publicKey) throws IOException, CertificateParsingException {
    V3TBSCertificateGenerator tbsGenerator = new V3TBSCertificateGenerator();
    ASN1ObjectIdentifier sigAlgOid;
    AlgorithmIdentifier sigAlgId;
    byte[] signature;
    switch(mKeymasterAlgorithm) {
        case KeymasterDefs.KM_ALGORITHM_EC:
            sigAlgOid = X9ObjectIdentifiers.ecdsa_with_SHA256;
            sigAlgId = new AlgorithmIdentifier(sigAlgOid);
            ASN1EncodableVector v = new ASN1EncodableVector();
            v.add(new DERInteger(0));
            v.add(new DERInteger(0));
            signature = new DERSequence().getEncoded();
            break;
        case KeymasterDefs.KM_ALGORITHM_RSA:
            sigAlgOid = PKCSObjectIdentifiers.sha256WithRSAEncryption;
            sigAlgId = new AlgorithmIdentifier(sigAlgOid, DERNull.INSTANCE);
            signature = new byte[1];
            break;
        default:
            throw new ProviderException("Unsupported key algorithm: " + mKeymasterAlgorithm);
    }
    try (ASN1InputStream publicKeyInfoIn = new ASN1InputStream(publicKey.getEncoded())) {
        tbsGenerator.setSubjectPublicKeyInfo(SubjectPublicKeyInfo.getInstance(publicKeyInfoIn.readObject()));
    }
    tbsGenerator.setSerialNumber(new ASN1Integer(mSpec.getCertificateSerialNumber()));
    X509Principal subject = new X509Principal(mSpec.getCertificateSubject().getEncoded());
    tbsGenerator.setSubject(subject);
    tbsGenerator.setIssuer(subject);
    tbsGenerator.setStartDate(new Time(mSpec.getCertificateNotBefore()));
    tbsGenerator.setEndDate(new Time(mSpec.getCertificateNotAfter()));
    tbsGenerator.setSignature(sigAlgId);
    TBSCertificate tbsCertificate = tbsGenerator.generateTBSCertificate();
    ASN1EncodableVector result = new ASN1EncodableVector();
    result.add(tbsCertificate);
    result.add(sigAlgId);
    result.add(new DERBitString(signature));
    return new X509CertificateObject(Certificate.getInstance(new DERSequence(result)));
}

Example 3 with Time

use of org.spongycastle.asn1.x509.Time in project android_frameworks_base by AOSPA.

the class AndroidKeyStoreKeyPairGeneratorSpi method generateSelfSignedCertificateWithFakeSignature.

@SuppressWarnings("deprecation")
private X509Certificate generateSelfSignedCertificateWithFakeSignature(PublicKey publicKey) throws IOException, CertificateParsingException {
    V3TBSCertificateGenerator tbsGenerator = new V3TBSCertificateGenerator();
    ASN1ObjectIdentifier sigAlgOid;
    AlgorithmIdentifier sigAlgId;
    byte[] signature;
    switch(mKeymasterAlgorithm) {
        case KeymasterDefs.KM_ALGORITHM_EC:
            sigAlgOid = X9ObjectIdentifiers.ecdsa_with_SHA256;
            sigAlgId = new AlgorithmIdentifier(sigAlgOid);
            ASN1EncodableVector v = new ASN1EncodableVector();
            v.add(new DERInteger(0));
            v.add(new DERInteger(0));
            signature = new DERSequence().getEncoded();
            break;
        case KeymasterDefs.KM_ALGORITHM_RSA:
            sigAlgOid = PKCSObjectIdentifiers.sha256WithRSAEncryption;
            sigAlgId = new AlgorithmIdentifier(sigAlgOid, DERNull.INSTANCE);
            signature = new byte[1];
            break;
        default:
            throw new ProviderException("Unsupported key algorithm: " + mKeymasterAlgorithm);
    }
    try (ASN1InputStream publicKeyInfoIn = new ASN1InputStream(publicKey.getEncoded())) {
        tbsGenerator.setSubjectPublicKeyInfo(SubjectPublicKeyInfo.getInstance(publicKeyInfoIn.readObject()));
    }
    tbsGenerator.setSerialNumber(new ASN1Integer(mSpec.getCertificateSerialNumber()));
    X509Principal subject = new X509Principal(mSpec.getCertificateSubject().getEncoded());
    tbsGenerator.setSubject(subject);
    tbsGenerator.setIssuer(subject);
    tbsGenerator.setStartDate(new Time(mSpec.getCertificateNotBefore()));
    tbsGenerator.setEndDate(new Time(mSpec.getCertificateNotAfter()));
    tbsGenerator.setSignature(sigAlgId);
    TBSCertificate tbsCertificate = tbsGenerator.generateTBSCertificate();
    ASN1EncodableVector result = new ASN1EncodableVector();
    result.add(tbsCertificate);
    result.add(sigAlgId);
    result.add(new DERBitString(signature));
    return new X509CertificateObject(Certificate.getInstance(new DERSequence(result)));
}

Example 4 with Time

use of org.spongycastle.asn1.x509.Time in project robovm by robovm.

the class PKIXCertPathValidatorSpi method engineValidate.

// END android-added
public CertPathValidatorResult engineValidate(CertPath certPath, CertPathParameters params) throws CertPathValidatorException, InvalidAlgorithmParameterException {
    if (!(params instanceof PKIXParameters)) {
        throw new InvalidAlgorithmParameterException("Parameters must be a " + PKIXParameters.class.getName() + " instance.");
    }
    ExtendedPKIXParameters paramsPKIX;
    if (params instanceof ExtendedPKIXParameters) {
        paramsPKIX = (ExtendedPKIXParameters) params;
    } else {
        paramsPKIX = ExtendedPKIXParameters.getInstance((PKIXParameters) params);
    }
    if (paramsPKIX.getTrustAnchors() == null) {
        throw new InvalidAlgorithmParameterException("trustAnchors is null, this is not allowed for certification path validation.");
    }
    //
    // 6.1.1 - inputs
    //
    //
    // (a)
    //
    List certs = certPath.getCertificates();
    int n = certs.size();
    if (certs.isEmpty()) {
        throw new CertPathValidatorException("Certification path is empty.", null, certPath, 0);
    }
    // BEGIN android-added
    {
        X509Certificate cert = (X509Certificate) certs.get(0);
        if (cert != null) {
            BigInteger serial = cert.getSerialNumber();
            if (blacklist.isSerialNumberBlackListed(serial)) {
                // emulate CRL exception message in RFC3280CertPathUtilities.checkCRLs
                String message = "Certificate revocation of serial 0x" + serial.toString(16);
                System.out.println(message);
                AnnotatedException e = new AnnotatedException(message);
                throw new CertPathValidatorException(e.getMessage(), e, certPath, 0);
            }
        }
    }
    // END android-added
    //
    // (b)
    //
    // Date validDate = CertPathValidatorUtilities.getValidDate(paramsPKIX);
    //
    // (c)
    //
    Set userInitialPolicySet = paramsPKIX.getInitialPolicies();
    //
    // (d)
    // 
    TrustAnchor trust;
    try {
        trust = CertPathValidatorUtilities.findTrustAnchor((X509Certificate) certs.get(certs.size() - 1), paramsPKIX.getTrustAnchors(), paramsPKIX.getSigProvider());
    } catch (AnnotatedException e) {
        throw new CertPathValidatorException(e.getMessage(), e, certPath, certs.size() - 1);
    }
    if (trust == null) {
        throw new CertPathValidatorException("Trust anchor for certification path not found.", null, certPath, -1);
    }
    //
    // (e), (f), (g) are part of the paramsPKIX object.
    //
    Iterator certIter;
    int index = 0;
    int i;
    // Certificate for each interation of the validation loop
    // Signature information for each iteration of the validation loop
    //
    // 6.1.2 - setup
    //
    //
    // (a)
    //
    List[] policyNodes = new ArrayList[n + 1];
    for (int j = 0; j < policyNodes.length; j++) {
        policyNodes[j] = new ArrayList();
    }
    Set policySet = new HashSet();
    policySet.add(RFC3280CertPathUtilities.ANY_POLICY);
    PKIXPolicyNode validPolicyTree = new PKIXPolicyNode(new ArrayList(), 0, policySet, null, new HashSet(), RFC3280CertPathUtilities.ANY_POLICY, false);
    policyNodes[0].add(validPolicyTree);
    //
    // (b) and (c)
    //
    PKIXNameConstraintValidator nameConstraintValidator = new PKIXNameConstraintValidator();
    // (d)
    //
    int explicitPolicy;
    Set acceptablePolicies = new HashSet();
    if (paramsPKIX.isExplicitPolicyRequired()) {
        explicitPolicy = 0;
    } else {
        explicitPolicy = n + 1;
    }
    //
    // (e)
    //
    int inhibitAnyPolicy;
    if (paramsPKIX.isAnyPolicyInhibited()) {
        inhibitAnyPolicy = 0;
    } else {
        inhibitAnyPolicy = n + 1;
    }
    //
    // (f)
    //
    int policyMapping;
    if (paramsPKIX.isPolicyMappingInhibited()) {
        policyMapping = 0;
    } else {
        policyMapping = n + 1;
    }
    //
    // (g), (h), (i), (j)
    //
    PublicKey workingPublicKey;
    X500Principal workingIssuerName;
    X509Certificate sign = trust.getTrustedCert();
    try {
        if (sign != null) {
            workingIssuerName = CertPathValidatorUtilities.getSubjectPrincipal(sign);
            workingPublicKey = sign.getPublicKey();
        } else {
            workingIssuerName = new X500Principal(trust.getCAName());
            workingPublicKey = trust.getCAPublicKey();
        }
    } catch (IllegalArgumentException ex) {
        throw new ExtCertPathValidatorException("Subject of trust anchor could not be (re)encoded.", ex, certPath, -1);
    }
    AlgorithmIdentifier workingAlgId = null;
    try {
        workingAlgId = CertPathValidatorUtilities.getAlgorithmIdentifier(workingPublicKey);
    } catch (CertPathValidatorException e) {
        throw new ExtCertPathValidatorException("Algorithm identifier of public key of trust anchor could not be read.", e, certPath, -1);
    }
    DERObjectIdentifier workingPublicKeyAlgorithm = workingAlgId.getObjectId();
    ASN1Encodable workingPublicKeyParameters = workingAlgId.getParameters();
    //
    // (k)
    //
    int maxPathLength = n;
    if (paramsPKIX.getTargetConstraints() != null && !paramsPKIX.getTargetConstraints().match((X509Certificate) certs.get(0))) {
        throw new ExtCertPathValidatorException("Target certificate in certification path does not match targetConstraints.", null, certPath, 0);
    }
    // 
    // initialize CertPathChecker's
    //
    List pathCheckers = paramsPKIX.getCertPathCheckers();
    certIter = pathCheckers.iterator();
    while (certIter.hasNext()) {
        ((PKIXCertPathChecker) certIter.next()).init(false);
    }
    X509Certificate cert = null;
    for (index = certs.size() - 1; index >= 0; index--) {
        // BEGIN android-added
        if (blacklist.isPublicKeyBlackListed(workingPublicKey)) {
            // emulate CRL exception message in RFC3280CertPathUtilities.checkCRLs
            String message = "Certificate revocation of public key " + workingPublicKey;
            System.out.println(message);
            AnnotatedException e = new AnnotatedException(message);
            throw new CertPathValidatorException(e.getMessage(), e, certPath, index);
        }
        // END android-added
        // try
        // {
        //
        // i as defined in the algorithm description
        //
        i = n - index;
        //
        // set certificate to be checked in this round
        // sign and workingPublicKey and workingIssuerName are set
        // at the end of the for loop and initialized the
        // first time from the TrustAnchor
        //
        cert = (X509Certificate) certs.get(index);
        boolean verificationAlreadyPerformed = (index == certs.size() - 1);
        //
        // 6.1.3
        //
        RFC3280CertPathUtilities.processCertA(certPath, paramsPKIX, index, workingPublicKey, verificationAlreadyPerformed, workingIssuerName, sign);
        RFC3280CertPathUtilities.processCertBC(certPath, index, nameConstraintValidator);
        validPolicyTree = RFC3280CertPathUtilities.processCertD(certPath, index, acceptablePolicies, validPolicyTree, policyNodes, inhibitAnyPolicy);
        validPolicyTree = RFC3280CertPathUtilities.processCertE(certPath, index, validPolicyTree);
        RFC3280CertPathUtilities.processCertF(certPath, index, validPolicyTree, explicitPolicy);
        if (i != n) {
            if (cert != null && cert.getVersion() == 1) {
                throw new CertPathValidatorException("Version 1 certificates can't be used as CA ones.", null, certPath, index);
            }
            RFC3280CertPathUtilities.prepareNextCertA(certPath, index);
            validPolicyTree = RFC3280CertPathUtilities.prepareCertB(certPath, index, policyNodes, validPolicyTree, policyMapping);
            RFC3280CertPathUtilities.prepareNextCertG(certPath, index, nameConstraintValidator);
            // (h)
            explicitPolicy = RFC3280CertPathUtilities.prepareNextCertH1(certPath, index, explicitPolicy);
            policyMapping = RFC3280CertPathUtilities.prepareNextCertH2(certPath, index, policyMapping);
            inhibitAnyPolicy = RFC3280CertPathUtilities.prepareNextCertH3(certPath, index, inhibitAnyPolicy);
            //
            // (i)
            //
            explicitPolicy = RFC3280CertPathUtilities.prepareNextCertI1(certPath, index, explicitPolicy);
            policyMapping = RFC3280CertPathUtilities.prepareNextCertI2(certPath, index, policyMapping);
            // (j)
            inhibitAnyPolicy = RFC3280CertPathUtilities.prepareNextCertJ(certPath, index, inhibitAnyPolicy);
            // (k)
            RFC3280CertPathUtilities.prepareNextCertK(certPath, index);
            // (l)
            maxPathLength = RFC3280CertPathUtilities.prepareNextCertL(certPath, index, maxPathLength);
            // (m)
            maxPathLength = RFC3280CertPathUtilities.prepareNextCertM(certPath, index, maxPathLength);
            // (n)
            RFC3280CertPathUtilities.prepareNextCertN(certPath, index);
            Set criticalExtensions = cert.getCriticalExtensionOIDs();
            if (criticalExtensions != null) {
                criticalExtensions = new HashSet(criticalExtensions);
                // these extensions are handled by the algorithm
                criticalExtensions.remove(RFC3280CertPathUtilities.KEY_USAGE);
                criticalExtensions.remove(RFC3280CertPathUtilities.CERTIFICATE_POLICIES);
                criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_MAPPINGS);
                criticalExtensions.remove(RFC3280CertPathUtilities.INHIBIT_ANY_POLICY);
                criticalExtensions.remove(RFC3280CertPathUtilities.ISSUING_DISTRIBUTION_POINT);
                criticalExtensions.remove(RFC3280CertPathUtilities.DELTA_CRL_INDICATOR);
                criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_CONSTRAINTS);
                criticalExtensions.remove(RFC3280CertPathUtilities.BASIC_CONSTRAINTS);
                criticalExtensions.remove(RFC3280CertPathUtilities.SUBJECT_ALTERNATIVE_NAME);
                criticalExtensions.remove(RFC3280CertPathUtilities.NAME_CONSTRAINTS);
            } else {
                criticalExtensions = new HashSet();
            }
            // (o)
            RFC3280CertPathUtilities.prepareNextCertO(certPath, index, criticalExtensions, pathCheckers);
            // set signing certificate for next round
            sign = cert;
            // (c)
            workingIssuerName = CertPathValidatorUtilities.getSubjectPrincipal(sign);
            // (d)
            try {
                workingPublicKey = CertPathValidatorUtilities.getNextWorkingKey(certPath.getCertificates(), index);
            } catch (CertPathValidatorException e) {
                throw new CertPathValidatorException("Next working key could not be retrieved.", e, certPath, index);
            }
            workingAlgId = CertPathValidatorUtilities.getAlgorithmIdentifier(workingPublicKey);
            // (f)
            workingPublicKeyAlgorithm = workingAlgId.getObjectId();
            // (e)
            workingPublicKeyParameters = workingAlgId.getParameters();
        }
    }
    //
    // 6.1.5 Wrap-up procedure
    //
    explicitPolicy = RFC3280CertPathUtilities.wrapupCertA(explicitPolicy, cert);
    explicitPolicy = RFC3280CertPathUtilities.wrapupCertB(certPath, index + 1, explicitPolicy);
    //
    // (c) (d) and (e) are already done
    //
    //
    // (f)
    //
    Set criticalExtensions = cert.getCriticalExtensionOIDs();
    if (criticalExtensions != null) {
        criticalExtensions = new HashSet(criticalExtensions);
        // these extensions are handled by the algorithm
        criticalExtensions.remove(RFC3280CertPathUtilities.KEY_USAGE);
        criticalExtensions.remove(RFC3280CertPathUtilities.CERTIFICATE_POLICIES);
        criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_MAPPINGS);
        criticalExtensions.remove(RFC3280CertPathUtilities.INHIBIT_ANY_POLICY);
        criticalExtensions.remove(RFC3280CertPathUtilities.ISSUING_DISTRIBUTION_POINT);
        criticalExtensions.remove(RFC3280CertPathUtilities.DELTA_CRL_INDICATOR);
        criticalExtensions.remove(RFC3280CertPathUtilities.POLICY_CONSTRAINTS);
        criticalExtensions.remove(RFC3280CertPathUtilities.BASIC_CONSTRAINTS);
        criticalExtensions.remove(RFC3280CertPathUtilities.SUBJECT_ALTERNATIVE_NAME);
        criticalExtensions.remove(RFC3280CertPathUtilities.NAME_CONSTRAINTS);
        criticalExtensions.remove(RFC3280CertPathUtilities.CRL_DISTRIBUTION_POINTS);
    } else {
        criticalExtensions = new HashSet();
    }
    RFC3280CertPathUtilities.wrapupCertF(certPath, index + 1, pathCheckers, criticalExtensions);
    PKIXPolicyNode intersection = RFC3280CertPathUtilities.wrapupCertG(certPath, paramsPKIX, userInitialPolicySet, index + 1, policyNodes, validPolicyTree, acceptablePolicies);
    if ((explicitPolicy > 0) || (intersection != null)) {
        return new PKIXCertPathValidatorResult(trust, intersection, cert.getPublicKey());
    }
    throw new CertPathValidatorException("Path processing failed on policy.", null, certPath, index);
}

Example 5 with Time

use of org.spongycastle.asn1.x509.Time in project android_frameworks_base by crdroidandroid.

the class AndroidKeyStoreKeyPairGeneratorSpi method generateSelfSignedCertificateWithFakeSignature.

@SuppressWarnings("deprecation")
private X509Certificate generateSelfSignedCertificateWithFakeSignature(PublicKey publicKey) throws IOException, CertificateParsingException {
    V3TBSCertificateGenerator tbsGenerator = new V3TBSCertificateGenerator();
    ASN1ObjectIdentifier sigAlgOid;
    AlgorithmIdentifier sigAlgId;
    byte[] signature;
    switch(mKeymasterAlgorithm) {
        case KeymasterDefs.KM_ALGORITHM_EC:
            sigAlgOid = X9ObjectIdentifiers.ecdsa_with_SHA256;
            sigAlgId = new AlgorithmIdentifier(sigAlgOid);
            ASN1EncodableVector v = new ASN1EncodableVector();
            v.add(new DERInteger(0));
            v.add(new DERInteger(0));
            signature = new DERSequence().getEncoded();
            break;
        case KeymasterDefs.KM_ALGORITHM_RSA:
            sigAlgOid = PKCSObjectIdentifiers.sha256WithRSAEncryption;
            sigAlgId = new AlgorithmIdentifier(sigAlgOid, DERNull.INSTANCE);
            signature = new byte[1];
            break;
        default:
            throw new ProviderException("Unsupported key algorithm: " + mKeymasterAlgorithm);
    }
    try (ASN1InputStream publicKeyInfoIn = new ASN1InputStream(publicKey.getEncoded())) {
        tbsGenerator.setSubjectPublicKeyInfo(SubjectPublicKeyInfo.getInstance(publicKeyInfoIn.readObject()));
    }
    tbsGenerator.setSerialNumber(new ASN1Integer(mSpec.getCertificateSerialNumber()));
    X509Principal subject = new X509Principal(mSpec.getCertificateSubject().getEncoded());
    tbsGenerator.setSubject(subject);
    tbsGenerator.setIssuer(subject);
    tbsGenerator.setStartDate(new Time(mSpec.getCertificateNotBefore()));
    tbsGenerator.setEndDate(new Time(mSpec.getCertificateNotAfter()));
    tbsGenerator.setSignature(sigAlgId);
    TBSCertificate tbsCertificate = tbsGenerator.generateTBSCertificate();
    ASN1EncodableVector result = new ASN1EncodableVector();
    result.add(tbsCertificate);
    result.add(sigAlgId);
    result.add(new DERBitString(signature));
    return new X509CertificateObject(Certificate.getInstance(new DERSequence(result)));
}