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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.its.jcajce;

import java.security.Provider;
import java.security.interfaces.ECPublicKey;

import org.bouncycastle.its.ITSCertificate;
import org.bouncycastle.its.ITSExplicitCertificateBuilder;
import org.bouncycastle.its.ITSPublicEncryptionKey;
import org.bouncycastle.its.operator.ITSContentSigner;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.oer.its.CertificateId;
import org.bouncycastle.oer.its.ToBeSignedCertificate;

public class JcaITSExplicitCertificateBuilder
    extends ITSExplicitCertificateBuilder
{
    private JcaJceHelper helper;

    /**
     * Base constructor for an ITS certificate.
     *
     * @param signer         the content signer to be used to generate the signature validating the certificate.
     * @param tbsCertificate
     */
    public JcaITSExplicitCertificateBuilder(ITSContentSigner signer, ToBeSignedCertificate.Builder tbsCertificate)
    {
        this(signer, tbsCertificate, new DefaultJcaJceHelper());
    }

    private JcaITSExplicitCertificateBuilder(ITSContentSigner signer, ToBeSignedCertificate.Builder tbsCertificate, JcaJceHelper helper)
    {
        super(signer, tbsCertificate);
        this.helper = helper;
    }

    public JcaITSExplicitCertificateBuilder setProvider(Provider provider)
    {
        this.helper = new ProviderJcaJceHelper(provider);
        return this;
    }

    public JcaITSExplicitCertificateBuilder setProvider(String providerName)
    {
        this.helper = new NamedJcaJceHelper(providerName);
        return this;
    }

    public ITSCertificate build(
        CertificateId certificateId,
        ECPublicKey verificationKey)
    {
        return build(certificateId, verificationKey, null);
    }

    public ITSCertificate build(
        CertificateId certificateId,
        ECPublicKey verificationKey,
        ECPublicKey encryptionKey)
    {
        ITSPublicEncryptionKey publicEncryptionKey = null;
        if (encryptionKey != null)
        {
            publicEncryptionKey = new JceITSPublicEncryptionKey(encryptionKey, helper);
        }

        return super.build(certificateId, new JcaITSPublicVerificationKey(verificationKey, helper), publicEncryptionKey);
    }
}