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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;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.oer.its.CrlSeries;
import org.bouncycastle.oer.its.HashedId;
import org.bouncycastle.oer.its.PsidGroupPermissions;
import org.bouncycastle.oer.its.PsidSsp;
import org.bouncycastle.oer.its.SequenceOfPsidGroupPermissions;
import org.bouncycastle.oer.its.SequenceOfPsidSsp;
import org.bouncycastle.oer.its.ToBeSignedCertificate;

public class ITSCertificateBuilder
{
    protected final ToBeSignedCertificate.Builder tbsCertificateBuilder;
    protected final ITSCertificate issuer;

    protected ASN1Integer version = new ASN1Integer(3);
    //  ETSI TS 103 097 V1.4.1 (2020-10) default/constraint - Section 6.
    protected HashedId cracaId = new HashedId.HashedId3(new byte[3]);
    //  ETSI TS 103 097 V1.4.1 (2020-10) default/constraint - Section 6.
    protected CrlSeries crlSeries = new CrlSeries(0);

    // TODO: temp constructor to get signing working - self signed
    public ITSCertificateBuilder(ToBeSignedCertificate.Builder tbsCertificateBuilder)
    {
        this(null, tbsCertificateBuilder);
    }

    // TODO: temp constructor to get signing working - non self signed
    public ITSCertificateBuilder(ITSCertificate issuer, ToBeSignedCertificate.Builder tbsCertificateBuilder)
    {
        this.issuer = issuer;
        this.tbsCertificateBuilder = tbsCertificateBuilder;
        this.tbsCertificateBuilder.setCracaId(cracaId);
        this.tbsCertificateBuilder.setCrlSeries(crlSeries);
    }

    public ITSCertificate getIssuer()
    {
        return issuer;
    }

    /**
     * set the version - default value is 3.
     *
     * @param version certificate version.
     * @return the current builder.
     */
    public ITSCertificateBuilder setVersion(int version)
    {
        this.version = new ASN1Integer(version);
        return this;
    }

    /**
     * Set the cracaId. The default value for the field is 000000'H in line with ETSI TS 103 097 V1.4.1 (2020-10) default/constraint - Section 6.
     *
     * @param cracaId hashedId for the craca, the ID of the CRL manager.
     * @return the current builder.
     */
    public ITSCertificateBuilder setCracaId(byte[] cracaId)
    {
        this.cracaId = new HashedId.HashedId3(cracaId);
        this.tbsCertificateBuilder.setCracaId(this.cracaId);

        return this;
    }

    /**
     * Set the crlSeries. The default value for the field is 0'D in line with ETSI TS 103 097 V1.4.1 (2020-10) default/constraint - Section 6.
     *
     * @param crlSeries id for the CRL series for revocation.
     * @return the current builder.
     */
    public ITSCertificateBuilder setCrlSeries(int crlSeries)
    {
        this.crlSeries = new CrlSeries(crlSeries);
        this.tbsCertificateBuilder.setCrlSeries(this.crlSeries);

        return this;
    }

    public ITSCertificateBuilder setValidityPeriod(ITSValidityPeriod validityPeriod)
    {
        tbsCertificateBuilder.setValidityPeriod(validityPeriod.toASN1Structure());

        return this;
    }
    
    public ITSCertificateBuilder setCertIssuePermissions(PsidGroupPermissions... permissions)
    {
        tbsCertificateBuilder.setCertIssuePermissions(
            SequenceOfPsidGroupPermissions.builder().addGroupPermission(permissions).createSequenceOfPsidGroupPermissions());

        return this;
    }

    public ITSCertificateBuilder setAppPermissions(PsidSsp... psidSsps)
    {
        SequenceOfPsidSsp.Builder bldr = SequenceOfPsidSsp.builder();

        for (int i = 0; i != psidSsps.length; i++)
        {
            bldr.setItem(psidSsps[i]);
        }

        tbsCertificateBuilder.setAppPermissions(bldr.createSequenceOfPsidSsp());

        return this;
    }
}