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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.cert.bc;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.oiw.OIWObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.AuthorityKeyIdentifier;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.cert.X509ExtensionUtils;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.util.SubjectPublicKeyInfoFactory;
import org.bouncycastle.operator.DigestCalculator;

public class BcX509ExtensionUtils
    extends X509ExtensionUtils
{
    /**
     * Create a utility class pre-configured with a SHA-1 digest calculator based on the
     * BC implementation.
     */
    public BcX509ExtensionUtils()
    {
        super(new SHA1DigestCalculator());
    }

    public BcX509ExtensionUtils(DigestCalculator calculator)
    {
        super(calculator);
    }

    public AuthorityKeyIdentifier createAuthorityKeyIdentifier(
        AsymmetricKeyParameter publicKey)
        throws IOException
    {
        return super.createAuthorityKeyIdentifier(SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(publicKey));
    }

    /**
     * Return a RFC 3280 type 1 key identifier. As in:
     *      * (1) The keyIdentifier is composed of the 160-bit SHA-1 hash of the
     * value of the BIT STRING subjectPublicKey (excluding the tag,
     * length, and number of unused bits).
     * 
     * @param publicKey the key object containing the key identifier is to be based on.
     * @return the key identifier.
     */
    public SubjectKeyIdentifier createSubjectKeyIdentifier(
        AsymmetricKeyParameter publicKey)
        throws IOException
    {
        return super.createSubjectKeyIdentifier(SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(publicKey));
    }

    private static class SHA1DigestCalculator
        implements DigestCalculator
    {
        private ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        public AlgorithmIdentifier getAlgorithmIdentifier()
        {
            return new AlgorithmIdentifier(OIWObjectIdentifiers.idSHA1);
        }

        public OutputStream getOutputStream()
        {
            return bOut;
        }

        public byte[] getDigest()
        {
            byte[] bytes = bOut.toByteArray();

            bOut.reset();

            Digest sha1 = new SHA1Digest();

            sha1.update(bytes, 0, bytes.length);

            byte[] digest = new byte[sha1.getDigestSize()];

            sha1.doFinal(digest, 0);

            return digest;
        }
    }
}