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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 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.cert.crmf.jcajce;

import java.io.IOException;
import java.security.Provider;
import java.security.PublicKey;

import javax.security.auth.x500.X500Principal;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.crmf.CertReqMsg;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.cert.crmf.CRMFException;
import org.bouncycastle.cert.crmf.CertificateRequestMessage;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;

public class JcaCertificateRequestMessage
    extends CertificateRequestMessage
{
    private CRMFHelper helper = new CRMFHelper(new DefaultJcaJceHelper());

    public JcaCertificateRequestMessage(byte[] certReqMsg)
    {
        this(CertReqMsg.getInstance(certReqMsg));
    }

    public JcaCertificateRequestMessage(CertificateRequestMessage certReqMsg)
    {
        this(certReqMsg.toASN1Structure());
    }

    public JcaCertificateRequestMessage(CertReqMsg certReqMsg)
    {
        super(certReqMsg);
    }

    public JcaCertificateRequestMessage setProvider(String providerName)
    {
        this.helper = new CRMFHelper(new NamedJcaJceHelper(providerName));

        return this;
    }

    public JcaCertificateRequestMessage setProvider(Provider provider)
    {
        this.helper = new CRMFHelper(new ProviderJcaJceHelper(provider));

        return this;
    }

    public X500Principal getSubjectX500Principal()
    {
        X500Name subject = this.getCertTemplate().getSubject();

        if (subject != null)
        {
            try
            {
                return new X500Principal(subject.getEncoded(ASN1Encoding.DER));
            }
            catch (IOException e)
            {
                throw new IllegalStateException("unable to construct DER encoding of name: " + e.getMessage());
            }
        }

        return null;
    }

    public PublicKey getPublicKey()
        throws CRMFException
    {
        SubjectPublicKeyInfo subjectPublicKeyInfo = getCertTemplate().getPublicKey();

        if (subjectPublicKeyInfo != null)
        {
            return helper.toPublicKey(subjectPublicKeyInfo);
        }

        return null;
    }
}