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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.cms;

import java.math.BigInteger;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cert.selector.X509CertificateHolderSelector;
import org.bouncycastle.util.Selector;

/**
 * a basic index for a signer.
 */
public class SignerId
    implements Selector
{
    private X509CertificateHolderSelector baseSelector;

    private SignerId(X509CertificateHolderSelector baseSelector)
    {
        this.baseSelector = baseSelector;
    }

    /**
     * Construct a signer ID with the value of a public key's subjectKeyId.
     *
     * @param subjectKeyId a subjectKeyId
     */
    public SignerId(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 SignerId(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 SignerId(X500Name issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        this(new X509CertificateHolderSelector(issuer, serialNumber, subjectKeyId));
    }

    public X500Name getIssuer()
    {
        return baseSelector.getIssuer();
    }

    public BigInteger getSerialNumber()
    {
        return baseSelector.getSerialNumber();
    }

    public byte[] getSubjectKeyIdentifier()
    {
        return baseSelector.getSubjectKeyIdentifier();
    }

    public int hashCode()
    {
        return baseSelector.hashCode();
    }

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

        SignerId id = (SignerId)o;

        return this.baseSelector.equals(id.baseSelector);
    }

    public boolean match(Object obj)
    {
        if (obj instanceof SignerInformation)
        {
            return ((SignerInformation)obj).getSID().equals(this);
        }

        return baseSelector.match(obj);
    }

    public Object clone()
    {
        return new SignerId(this.baseSelector);
    }
}