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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 and up. 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.jcajce;

import java.math.BigInteger;
import java.security.cert.X509Certificate;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cms.SignerId;

public class JcaSignerId
    extends SignerId
{
    /**
     * Construct a signer identifier based on the issuer, serial number and subject key identifier (if present) of the passed in
     * certificate.
     *
     * @param certificate certificate providing the issue and serial number and subject key identifier.
     */
    public JcaSignerId(X509Certificate certificate)
    {
        super(convertPrincipal(certificate.getIssuerX500Principal()), certificate.getSerialNumber(), CMSUtils.getSubjectKeyId(certificate));
    }

    /**
     * Construct a signer identifier based on the provided issuer and serial number..
     *
     * @param issuer the issuer to use.
     * @param serialNumber  the serial number to use.
     */
    public JcaSignerId(X500Principal issuer, BigInteger serialNumber)
    {
        super(convertPrincipal(issuer), serialNumber);
    }

    /**
     * Construct a signer identifier based on the provided issuer, serial number, and subjectKeyId..
     *
     * @param issuer the issuer to use.
     * @param serialNumber  the serial number to use.
     * @param subjectKeyId the subject key ID to use.
     */
    public JcaSignerId(X500Principal issuer, BigInteger serialNumber, byte[] subjectKeyId)
    {
        super(convertPrincipal(issuer), serialNumber, subjectKeyId);
    }

    private static X500Name convertPrincipal(X500Principal issuer)
    {
        if (issuer == null)
        {
            return null;
        }
        return X500Name.getInstance(issuer.getEncoded());
    }
}