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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.jcajce;

import java.math.BigInteger;
import java.security.PublicKey;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;
import java.util.Date;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x509.Time;
import org.bouncycastle.cert.X509v3CertificateBuilder;

/**
 * JCA helper class to allow JCA objects to be used in the construction of a Version 3 certificate.
 */
public class JcaX509v3CertificateBuilder
    extends X509v3CertificateBuilder
{
    /**
     * Initialise the builder using a PublicKey.
     *
     * @param issuer X500Name representing the issuer of this certificate.
     * @param serial the serial number for the certificate.
     * @param notBefore date before which the certificate is not valid.
     * @param notAfter date after which the certificate is not valid.
     * @param subject X500Name representing the subject of this certificate.
     * @param publicKey the public key to be associated with the certificate.
     */
    public JcaX509v3CertificateBuilder(X500Name issuer, BigInteger serial, Date notBefore, Date notAfter, X500Name subject, PublicKey publicKey)
    {
        super(issuer, serial, notBefore, notAfter, subject, SubjectPublicKeyInfo.getInstance(publicKey.getEncoded()));
    }

    /**
     * Initialise the builder using a PublicKey.
     *
     * @param issuer X500Name representing the issuer of this certificate.
     * @param serial the serial number for the certificate.
     * @param notBefore Time before which the certificate is not valid.
     * @param notAfter Time after which the certificate is not valid.
     * @param subject X500Name representing the subject of this certificate.
     * @param publicKey the public key to be associated with the certificate.
     */
    public JcaX509v3CertificateBuilder(X500Name issuer, BigInteger serial, Time notBefore, Time notAfter, X500Name subject, PublicKey publicKey)
    {
        super(issuer, serial, notBefore, notAfter, subject, SubjectPublicKeyInfo.getInstance(publicKey.getEncoded()));
    }

    /**
     * Initialise the builder using X500Principal objects and a PublicKey.
     *
     * @param issuer principal representing the issuer of this certificate.
     * @param serial the serial number for the certificate.
     * @param notBefore date before which the certificate is not valid.
     * @param notAfter date after which the certificate is not valid.
     * @param subject principal representing the subject of this certificate.
     * @param publicKey the public key to be associated with the certificate.
     */
    public JcaX509v3CertificateBuilder(X500Principal issuer, BigInteger serial, Date notBefore, Date notAfter, X500Principal subject, PublicKey publicKey)
    {
        super(X500Name.getInstance(issuer.getEncoded()), serial, notBefore, notAfter, X500Name.getInstance(subject.getEncoded()), SubjectPublicKeyInfo.getInstance(publicKey.getEncoded()));
    }

    /**
     * Initialise the builder using the subject from the passed in issuerCert as the issuer, as well as
     * passing through and converting the other objects provided.
     *
     * @param issuerCert certificate who's subject is the issuer of the certificate we are building.
     * @param serial the serial number for the certificate.
     * @param notBefore date before which the certificate is not valid.
     * @param notAfter date after which the certificate is not valid.
     * @param subject principal representing the subject of this certificate.
     * @param publicKey the public key to be associated with the certificate.
     */
    public JcaX509v3CertificateBuilder(X509Certificate issuerCert, BigInteger serial, Date notBefore, Date notAfter, X500Principal subject, PublicKey publicKey)
    {
        this(issuerCert.getSubjectX500Principal(), serial, notBefore, notAfter, subject, publicKey);
    }

    /**
     * Initialise the builder using the subject from the passed in issuerCert as the issuer, as well as
     * passing through and converting the other objects provided.
     *
     * @param issuerCert certificate who's subject is the issuer of the certificate we are building.
     * @param serial the serial number for the certificate.
     * @param notBefore date before which the certificate is not valid.
     * @param notAfter date after which the certificate is not valid.
     * @param subject principal representing the subject of this certificate.
     * @param publicKey the public key to be associated with the certificate.
     */
    public JcaX509v3CertificateBuilder(X509Certificate issuerCert, BigInteger serial, Date notBefore, Date notAfter, X500Name subject, PublicKey publicKey)
    {
        this(X500Name.getInstance(issuerCert.getSubjectX500Principal().getEncoded()), serial, notBefore, notAfter, subject, publicKey);
    }

    /**
     * Create a builder for a version 3 certificate, initialised with another certificate.
     *
     * @param template template certificate to base the new one on.
     */
    public JcaX509v3CertificateBuilder(X509Certificate template)
        throws CertificateEncodingException
    {
         super(new JcaX509CertificateHolder(template));
    }

    /**
     * Add a given extension field for the standard extensions tag (tag 3)
     * copying the extension value from another certificate.
     *
     * @param oid the type of the extension to be copied.
     * @param critical true if the extension is to be marked critical, false otherwise.
     * @param certificate the source of the extension to be copied.
     * @return the builder instance.
     */
    public JcaX509v3CertificateBuilder copyAndAddExtension(
        ASN1ObjectIdentifier oid,
        boolean critical,
        X509Certificate certificate)
        throws CertificateEncodingException
    {
        this.copyAndAddExtension(oid, critical, new JcaX509CertificateHolder(certificate));

        return this;
    }
}