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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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package org.bouncycastle.eac;

import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.eac.CVCertificate;
import org.bouncycastle.asn1.eac.CertificateBody;
import org.bouncycastle.asn1.eac.CertificateHolderAuthorization;
import org.bouncycastle.asn1.eac.CertificateHolderReference;
import org.bouncycastle.asn1.eac.CertificationAuthorityReference;
import org.bouncycastle.asn1.eac.EACTags;
import org.bouncycastle.asn1.eac.PackedDate;
import org.bouncycastle.asn1.eac.PublicKeyDataObject;
import org.bouncycastle.eac.operator.EACSigner;

public class EACCertificateBuilder
{
    private static final byte [] ZeroArray = new byte [] {0};

    private PublicKeyDataObject publicKey;
    private CertificateHolderAuthorization certificateHolderAuthorization;
    private PackedDate certificateEffectiveDate;
    private PackedDate certificateExpirationDate;
    private CertificateHolderReference certificateHolderReference;
    private CertificationAuthorityReference certificationAuthorityReference;

    public EACCertificateBuilder(
        CertificationAuthorityReference certificationAuthorityReference,
        PublicKeyDataObject publicKey,
        CertificateHolderReference certificateHolderReference,
        CertificateHolderAuthorization certificateHolderAuthorization,
        PackedDate certificateEffectiveDate,
        PackedDate certificateExpirationDate)
    {
        this.certificationAuthorityReference = certificationAuthorityReference;
        this.publicKey = publicKey;
        this.certificateHolderReference = certificateHolderReference;
        this.certificateHolderAuthorization = certificateHolderAuthorization;
        this.certificateEffectiveDate = certificateEffectiveDate;
        this.certificateExpirationDate = certificateExpirationDate;
    }

    private CertificateBody buildBody()
    {
        ASN1TaggedObject certificateProfileIdentifier;

        certificateProfileIdentifier = new DERTaggedObject(false, BERTags.APPLICATION,
                EACTags.INTERCHANGE_PROFILE, new DEROctetString(ZeroArray));

        CertificateBody body = new CertificateBody(
                certificateProfileIdentifier,
                certificationAuthorityReference,
                publicKey,
                certificateHolderReference,
                certificateHolderAuthorization,
                certificateEffectiveDate,
                certificateExpirationDate);

        return body;
    }

    public EACCertificateHolder build(EACSigner signer)
        throws EACException
    {
        try
        {
            CertificateBody body = buildBody();

            OutputStream vOut = signer.getOutputStream();

            vOut.write(body.getEncoded(ASN1Encoding.DER));

            vOut.close();

            return new EACCertificateHolder(new CVCertificate(body, signer.getSignature()));
        }
        catch (Exception e)
        {
            throw new EACException("unable to process signature: " + e.getMessage(), e);
        }
    }
}