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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.selector;

import java.math.BigInteger;

import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.IssuerAndSerialNumber;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Selector;

/**
 * a basic index for a X509CertificateHolder class
 */
public class X509CertificateHolderSelector
    implements Selector
{
    private byte[] subjectKeyId;

    private X500Name issuer;
    private BigInteger serialNumber;

    /**
     * Construct a selector with the value of a public key's subjectKeyId.
     *
     * @param subjectKeyId a subjectKeyId
     */
    public X509CertificateHolderSelector(byte[] subjectKeyId)
    {
        this(null, null, subjectKeyId);
    }

    /**
     * Construct a signer ID based on the issuer and serial number of the signer's associated
     * certificate.
     *
     * @param issuer the issuer of the signer's associated certificate.
     * @param serialNumber the serial number of the signer's associated certificate.
     */
    public X509CertificateHolderSelector(X500Name issuer, BigInteger serialNumber)
    {
        this(issuer, serialNumber, null);
    }

    /**
     * Construct a signer ID based on the issuer and serial number of the signer's associated
     * certificate.
     *
     * @param issuer the issuer of the signer's associated certificate.
     * @param serialNumber the serial number of the signer's associated certificate.
     * @param subjectKeyId the subject key identifier to use to match the signers associated certificate.
     */
    public X509CertificateHolderSelector(X500Name issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        this.issuer = issuer;
        this.serialNumber = serialNumber;
        this.subjectKeyId = subjectKeyId;
    }

    public X500Name getIssuer()
    {
        return issuer;
    }

    public BigInteger getSerialNumber()
    {
        return serialNumber;
    }

    public byte[] getSubjectKeyIdentifier()
    {
        return Arrays.clone(subjectKeyId);
    }

    public int hashCode()
    {
        int code = Arrays.hashCode(subjectKeyId);

        if (this.serialNumber != null)
        {
            code ^= this.serialNumber.hashCode();
        }

        if (this.issuer != null)
        {
            code ^= this.issuer.hashCode();
        }

        return code;
    }

    public boolean equals(
        Object  o)
    {
        if (!(o instanceof X509CertificateHolderSelector))
        {
            return false;
        }

        X509CertificateHolderSelector id = (X509CertificateHolderSelector)o;

        return Arrays.areEqual(subjectKeyId, id.subjectKeyId)
            && equalsObj(this.serialNumber, id.serialNumber)
            && equalsObj(this.issuer, id.issuer);
    }

    private boolean equalsObj(Object a, Object b)
    {
        return (a != null) ? a.equals(b) : b == null;
    }

    public boolean match(Object obj)
    {
        if (obj instanceof X509CertificateHolder)
        {
            X509CertificateHolder certHldr = (X509CertificateHolder)obj;

            if (this.getSerialNumber() != null)
            {
                IssuerAndSerialNumber iAndS = new IssuerAndSerialNumber(certHldr.toASN1Structure());

                return iAndS.getName().equals(this.issuer)
                    && iAndS.getSerialNumber().hasValue(this.serialNumber);
            }
            else if (subjectKeyId != null)
            {
                Extension ext = certHldr.getExtension(Extension.subjectKeyIdentifier);

                if (ext == null)
                {
                    return Arrays.areEqual(subjectKeyId, MSOutlookKeyIdCalculator.calculateKeyId(certHldr.getSubjectPublicKeyInfo()));
                }

                byte[] subKeyID = ASN1OctetString.getInstance(ext.getParsedValue()).getOctets();

                return Arrays.areEqual(subjectKeyId, subKeyID);
            }
        }
        else if (obj instanceof byte[])
        {
            return Arrays.areEqual(subjectKeyId, (byte[])obj);
        }

        return false;
    }

    public Object clone()
    {
        return new X509CertificateHolderSelector(this.issuer, this.serialNumber, this.subjectKeyId);
    }
}