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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.util.Arrays;
import org.bouncycastle.util.Selector;

/**
 * a basic index for an originator.
 */
class OriginatorId
    implements Selector
{
    private byte[] subjectKeyId;

    private X500Name issuer;
    private BigInteger serialNumber;

    /**
     * Construct a signer ID with the value of a public key's subjectKeyId.
     *
     * @param subjectKeyId a subjectKeyId
     */
    public OriginatorId(byte[] subjectKeyId)
    {
        setSubjectKeyID(subjectKeyId);
    }

    private void setSubjectKeyID(byte[] subjectKeyId)
    {
        this.subjectKeyId = 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 OriginatorId(X500Name issuer, BigInteger serialNumber)
    {
        setIssuerAndSerial(issuer, serialNumber);
    }

    private void setIssuerAndSerial(X500Name issuer, BigInteger serialNumber)
    {
        this.issuer = issuer;
        this.serialNumber = serialNumber;
    }

    /**
     * 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 OriginatorId(X500Name issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        setIssuerAndSerial(issuer, serialNumber);
        setSubjectKeyID(subjectKeyId);
    }

    public X500Name getIssuer()
    {
        return issuer;
    }

    public Object clone()
    {
        return new OriginatorId(this.issuer, this.serialNumber, this.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 OriginatorId))
        {
            return false;
        }

        OriginatorId id = (OriginatorId)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)
    {
        return false;
    }
}