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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.its;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.its.operator.ECDSAEncoder;
import org.bouncycastle.its.operator.ITSContentSigner;
import org.bouncycastle.oer.OEREncoder;
import org.bouncycastle.oer.its.ieee1609dot2.CertificateBase;
import org.bouncycastle.oer.its.ieee1609dot2.CertificateId;
import org.bouncycastle.oer.its.ieee1609dot2.CertificateType;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.HashAlgorithm;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.HashedId8;
import org.bouncycastle.oer.its.ieee1609dot2.IssuerIdentifier;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.PublicVerificationKey;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.Signature;
import org.bouncycastle.oer.its.ieee1609dot2.ToBeSignedCertificate;
import org.bouncycastle.oer.its.ieee1609dot2.VerificationKeyIndicator;
import org.bouncycastle.oer.its.template.ieee1609dot2.IEEE1609dot2;
import org.bouncycastle.util.Arrays;

public class ITSExplicitCertificateBuilder
    extends ITSCertificateBuilder
{
    private final ITSContentSigner signer;

    /**
     * Base constructor for an ITS certificate.
     *
     * @param signer         the content signer to be used to generate the signature validating the certificate.
     * @param tbsCertificate
     */
    // TODO: temp constructor to get signing working.
    public ITSExplicitCertificateBuilder(ITSContentSigner signer, ToBeSignedCertificate.Builder tbsCertificate)
    {
        super(tbsCertificate);
        this.signer = signer;
    }

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

    public ITSCertificate build(CertificateId certificateId, ITSPublicVerificationKey verificationKey, ITSPublicEncryptionKey publicEncryptionKey)
    {
        ToBeSignedCertificate.Builder tbsBldr = new ToBeSignedCertificate.Builder(tbsCertificateBuilder);
        
        tbsBldr.setId(certificateId);

        if (publicEncryptionKey != null)
        {
            tbsBldr.setEncryptionKey(publicEncryptionKey.toASN1Structure());
        }

        tbsBldr.setVerifyKeyIndicator(
            VerificationKeyIndicator.verificationKey(verificationKey.toASN1Structure()));

        ToBeSignedCertificate tbsCertificate = tbsBldr.createToBeSignedCertificate();

        ToBeSignedCertificate signerCert = null;
        VerificationKeyIndicator verificationKeyIndicator;
        if (signer.isForSelfSigning())
        {
            verificationKeyIndicator = tbsCertificate.getVerifyKeyIndicator();
        }
        else
        {
            signerCert = signer.getAssociatedCertificate().toASN1Structure().getToBeSigned();
            verificationKeyIndicator = signerCert.getVerifyKeyIndicator();
        }

        OutputStream sOut = signer.getOutputStream();

        try
        {
            sOut.write(OEREncoder.toByteArray(tbsCertificate, IEEE1609dot2.ToBeSignedCertificate.build()));

            sOut.close();
        }
        catch (IOException e)
        {
            throw new IllegalArgumentException("cannot produce certificate signature");
        }

        Signature sig = null;        // TODO: signature actually optional.
        switch (verificationKeyIndicator.getChoice())
        {
        case PublicVerificationKey.ecdsaNistP256:
            sig = ECDSAEncoder.toITS(SECObjectIdentifiers.secp256r1, signer.getSignature());
            break;
        case PublicVerificationKey.ecdsaBrainpoolP256r1:
            sig = ECDSAEncoder.toITS(TeleTrusTObjectIdentifiers.brainpoolP256r1, signer.getSignature());
            break;
        case PublicVerificationKey.ecdsaBrainpoolP384r1:
            sig = ECDSAEncoder.toITS(TeleTrusTObjectIdentifiers.brainpoolP384r1, signer.getSignature());
            break;
        default:
            throw new IllegalStateException("unknown key type");
        }

        CertificateBase.Builder baseBldr = new CertificateBase.Builder();

        ASN1ObjectIdentifier digestAlg = signer.getDigestAlgorithm().getAlgorithm();

        IssuerIdentifier issuerIdentifier;

        if (signer.isForSelfSigning())
        {

            if (digestAlg.equals(NISTObjectIdentifiers.id_sha256))
            {
                issuerIdentifier = IssuerIdentifier.self(HashAlgorithm.sha256);
            }
            else if (digestAlg.equals(NISTObjectIdentifiers.id_sha384))
            {
                issuerIdentifier = IssuerIdentifier.self(HashAlgorithm.sha384);
            }
            else
            {
                throw new IllegalStateException("unknown digest");
            }
        }
        else
        {
            byte[] parentDigest = signer.getAssociatedCertificateDigest();
            HashedId8 hashedID = new HashedId8(Arrays.copyOfRange(parentDigest, parentDigest.length - 8, parentDigest.length));
            if (digestAlg.equals(NISTObjectIdentifiers.id_sha256))
            {
                issuerIdentifier = IssuerIdentifier.sha256AndDigest(hashedID);
            }
            else if (digestAlg.equals(NISTObjectIdentifiers.id_sha384))
            {
                issuerIdentifier = IssuerIdentifier.sha384AndDigest(hashedID);
            }
            else
            {
                throw new IllegalStateException("unknown digest");
            }
        }

        baseBldr.setVersion(version);
        baseBldr.setType(CertificateType.explicit);
        baseBldr.setIssuer(issuerIdentifier);

        baseBldr.setToBeSigned(tbsCertificate);
        baseBldr.setSignature(sig);



        return new ITSCertificate(baseBldr.createCertificateBase());
    }
}