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The BSD License Copyright (c) 2010-2012 RIPE NCC All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: - Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. - Neither the name of the RIPE NCC nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 package net.ripe.rpki.commons.crypto.x509cert;
 
 
 import java.net.URI;
 import java.util.List;
 
 import static net.ripe.rpki.commons.crypto.x509cert.X509CertificateBuilderHelper.DEFAULT_SIGNATURE_PROVIDER;
 
 public final class X509CertificateUtil {
 
     private X509CertificateUtil() {
         //Utility classes should not have a public or default constructor.
     }
 
     public static byte[] getSubjectKeyIdentifier(X509Extension certificate) {
         try {
             byte[] extensionValue = certificate.getExtensionValue(......getId());
             if (extensionValue == null) {
                 return null;
             }
             return SubjectKeyIdentifier.getInstance(X509ExtensionUtil.fromExtensionValue(extensionValue)).getKeyIdentifier();
         } catch (IOException e) {
             throw new X509CertificateOperationException("Cannot get SubjectKeyIdentifier for certificate"e);
         }
     }
 
     public static byte[] getAuthorityKeyIdentifier(X509Extension certificate) {
         try {
             byte[] extensionValue = certificate.getExtensionValue(......getId());
             if (extensionValue == null) {
                 return null;
             }
             return AuthorityKeyIdentifier.getInstance(X509ExtensionUtil.fromExtensionValue(extensionValue)).getKeyIdentifier();
         } catch (IOException e) {
             throw new X509CertificateOperationException("Can not get AuthorityKeyIdentifier for certificate"e);
         }
    }
    public static X509ResourceCertificate parseDerEncoded(byte[] encoded) {
        parser.parse(ValidationResult.withLocation("unknown.cer"), encoded);
        return parser.getCertificate();
    }

    
Get a base 64-encoded, DER-encoded X.509 subjectPublicKeyInfo as used for the Trust Anchor Locator (TAL)

    public static String getEncodedSubjectPublicKeyInfo(X509Certificate certificate) {
        byte[] tbsCertificate;
        try {
            tbsCertificate = certificate.getTBSCertificate();
        } catch (CertificateEncodingException e) {
            throw new X509CertificateOperationException("Can't extract TBSCertificate from certificate"e);
        }
        ASN1Sequence tbsCertificateSequence = (ASN1Sequence) Asn1Util.decode(tbsCertificate);
        TBSCertificateStructure tbsCertificateStructure = new TBSCertificateStructure(tbsCertificateSequence);
        SubjectPublicKeyInfo subjectPublicKeyInfo = tbsCertificateStructure.getSubjectPublicKeyInfo();
        try {
            byte[] data = subjectPublicKeyInfo.getEncoded();
            Base64Encoder encoder = new Base64Encoder();
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            encoder.encode(data, 0, data.lengthout);
            out.flush();
            return out.toString();
        } catch (IOException e) {
            throw new X509CertificateOperationException("Can't encode SubjectPublicKeyInfo for certificate"e);
        }
    }
    public static boolean isRoot(X509Certificate certificate) {
        return certificate.getSubjectX500Principal().equals(certificate.getIssuerX500Principal());
    }
    public static boolean isCa(X509Certificate certificate) {
        try {
            byte[] basicConstraintsExtension = certificate.getExtensionValue(......getId());
            if (basicConstraintsExtension == null) {
                
The Basic Constraints extension field [...] MUST be present when the Subject is a CA, and MUST NOT be present otherwise. http://tools.ietf.org/html/draft-ietf-sidr-res-certs-21#section-4.9.1
                return false;
            }
            BasicConstraints constraints = BasicConstraints.getInstance(X509ExtensionUtil.fromExtensionValue(basicConstraintsExtension));
            return constraints.isCA();
        } catch (IOException e) {
            throw new X509CertificateOperationException(e);
        }
    }
    public static boolean isEe(X509Certificate certificate) {
        return !isCa(certificate);
    }
        try {
            byte[] extensionValue = certificate.getExtensionValue(......getId());
            if (extensionValue == null) {
                return null;
            }
            AccessDescription[] accessDescriptions = AuthorityInformationAccess.getInstance(X509ExtensionUtil.fromExtensionValue(extensionValue)).getAccessDescriptions();
            return X509CertificateInformationAccessDescriptor.convertAccessDescriptors(accessDescriptions);
        } catch (IOException e) {
            throw new X509CertificateOperationException(e);
        }
    }
        try {
            byte[] extensionValue = certificate.getExtensionValue(......getId());
            if (extensionValue == null) {
                return null;
            }
            AccessDescription[] accessDescriptions = AuthorityInformationAccess.getInstance(X509ExtensionUtil.fromExtensionValue(extensionValue)).getAccessDescriptions();
            return X509CertificateInformationAccessDescriptor.convertAccessDescriptors(accessDescriptions);
        } catch (IOException e) {
            throw new X509CertificateOperationException(e);
        }
    }
        Validate.notNull(method"method is null");
        return findFirstByMethod(method"rsync"getAuthorityInformationAccess(certificate));
    }
    public static URI findFirstSubjectInformationAccessByMethod(X509Certificate certificateASN1ObjectIdentifier method) {
        Validate.notNull(method"method is null");
        return findFirstByMethod(method"rsync"getSubjectInformationAccess(certificate));
    }
    private static URI findFirstByMethod(ASN1ObjectIdentifier methodString schemeX509CertificateInformationAccessDescriptor[] accessDescriptor) {
        if (accessDescriptor == null) {
            return null;
        }
        for (X509CertificateInformationAccessDescriptor ad : accessDescriptor) {
            if ((method.equals(ad.getMethod())) && (ad.getLocation().getScheme().equals(scheme))) {
                return ad.getLocation();
            }
        }
        return null;
    }
    public static URI[] getCrlDistributionPoints(X509Certificate certificate) {
        byte[] extensionValue = certificate.getExtensionValue(......getId());
        if (extensionValue == null) {
            return null;
        }
        try {
            CRLDistPoint crldp = CRLDistPoint.getInstance(X509ExtensionUtil.fromExtensionValue(extensionValue));
            return convertCrlDistributionPointToUris(crldp);
        } catch (IOException e) {
            return null;
        }
    }
    private static URI[] convertCrlDistributionPointToUris(CRLDistPoint crldp) {
        List<URIresult = new ArrayList<URI>();
        for (DistributionPoint dp : crldp.getDistributionPoints()) {
            GeneralNames names = (GeneralNamesdp.getDistributionPoint().getName();
            for (GeneralName name : names.getNames()) {
                DERIA5String uri = (DERIA5Stringname.getName();
                result.add(URI.create(uri.getString()));
            }
        }
        return result.toArray(new URI[result.size()]);
    }
    public static URI findFirstRsyncCrlDistributionPoint(X509Certificate certificate) {
        URI[] crlDistributionPoints = getCrlDistributionPoints(certificate);
        if (crlDistributionPoints == null) {
            return null;
        }
        for (URI uri : crlDistributionPoints) {
            if (uri.getScheme().equals("rsync")) {
                return uri;
            }
        }
        return null;
    }
    public static URI getManifestUri(X509Certificate certificate) {
    }
    public static URI getRepositoryUri(X509Certificate certificate) {
    }
    public static boolean isObjectIssuer(X509Certificate certificate) {
        return getManifestUri(certificate) != null;
    }
    public static ValidityPeriod getValidityPeriod(X509Certificate certificate) {
        return new ValidityPeriod(certificate.getNotBefore(), certificate.getNotAfter());
    }
    public static BigInteger getSerialNumber(X509Certificate certificate) {
        return certificate.getSerialNumber();
    }
    public static X500Principal getSubject(X509Certificate certificate) {
        return certificate.getSubjectX500Principal();
    }
    public static X500Principal getIssuer(X509Certificate certificate) {
        return certificate.getIssuerX500Principal();
    }
    public static PublicKey getPublicKey(X509Certificate certificate) {
        return certificate.getPublicKey();
    }
    public static void verify(X509Certificate certificatePublicKey publicKeythrows InvalidKeyExceptionSignatureException {
        try {
            certificate.verify(publicKey);
        } catch (CertificateException e) {
            throw new IllegalArgumentException(e);
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalArgumentException(e);
        } catch (NoSuchProviderException e) {
            throw new IllegalArgumentException(e);
        }
    }
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