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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 and up. 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 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.Certificate;
import org.bouncycastle.oer.its.CertificateBase;
import org.bouncycastle.oer.its.CertificateId;
import org.bouncycastle.oer.its.CertificateType;
import org.bouncycastle.oer.its.HashAlgorithm;
import org.bouncycastle.oer.its.HashedId;
import org.bouncycastle.oer.its.IssuerIdentifier;
import org.bouncycastle.oer.its.PublicVerificationKey;
import org.bouncycastle.oer.its.Signature;
import org.bouncycastle.oer.its.ToBeSignedCertificate;
import org.bouncycastle.oer.its.VerificationKeyIndicator;
import org.bouncycastle.oer.its.template.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.setCertificateId(certificateId);

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

        tbsBldr.setVerificationKeyIndicator(
            VerificationKeyIndicator.builder().publicVerificationKey(verificationKey.toASN1Structure())
                .createVerificationKeyIndicator());

        ToBeSignedCertificate tbsCertificate = tbsBldr.createToBeSignedCertificate();

        ToBeSignedCertificate signerCert = null;
        VerificationKeyIndicator verificationKeyIndicator;
        if (signer.isForSelfSigning())
        {
            verificationKeyIndicator = tbsCertificate.getVerificationKeyIndicator();
        }
        else
        {
            signerCert = signer.getAssociatedCertificate().toASN1Structure().getCertificateBase().getToBeSignedCertificate();
            verificationKeyIndicator = signerCert.getVerificationKeyIndicator();
        }

        OutputStream sOut = signer.getOutputStream();

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

            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();
        IssuerIdentifier.Builder issuerIdentifierBuilder = IssuerIdentifier.builder();

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

        if (signer.isForSelfSigning())
        {

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

        baseBldr.setVersion(version);
        baseBldr.setType(CertificateType.Explicit);
        baseBldr.setIssuer(issuerIdentifierBuilder.createIssuerIdentifier());

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

        Certificate.Builder bldr = new Certificate.Builder();

        bldr.setCertificateBase(baseBldr.createCertificateBase());

        return new ITSCertificate(bldr.createCertificate());
    }
}