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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.util.Date;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.cert.X509v1CertificateBuilder;

/**
 * JCA helper class to allow JCA objects to be used in the construction of a Version 1 certificate.
 */
public class JcaX509v1CertificateBuilder
    extends X509v1CertificateBuilder
{
    /**
     * 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 JcaX509v1CertificateBuilder(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 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 JcaX509v1CertificateBuilder(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()));
    }
}