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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;
 
 
 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 AbstractX509CertificateWrapperException("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 AbstractX509CertificateWrapperException("Can not get AuthorityKeyIdentifier for certificate"e);
         }
     }
 
     public static X509ResourceCertificate parseDerEncoded(byte[] encoded) {
         parser.parse(new ValidationLocation("certificate"), 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 AbstractX509CertificateWrapperException("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 AbstractX509CertificateWrapperException("Can't encode SubjectPublicKeyInfo for certificate"e);
        }
    }
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