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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.eac;

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

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1ParsingException;
import org.bouncycastle.asn1.eac.CVCertificateRequest;
import org.bouncycastle.asn1.eac.PublicKeyDataObject;
import org.bouncycastle.eac.operator.EACSignatureVerifier;

public class EACCertificateRequestHolder
{
    private CVCertificateRequest request;

    private static CVCertificateRequest parseBytes(byte[] requestEncoding)
        throws IOException
    {
        try
        {
            return CVCertificateRequest.getInstance(requestEncoding);
        }
        catch (ClassCastException e)
        {
            throw new EACIOException("malformed data: " + e.getMessage(), e);
        }
        catch (IllegalArgumentException e)
        {
            throw new EACIOException("malformed data: " + e.getMessage(), e);
        }
        catch (ASN1ParsingException e)
        {
            if (e.getCause() instanceof IOException)
            {
                throw (IOException)e.getCause();
            }
            else
            {
                throw new EACIOException("malformed data: " + e.getMessage(), e);
            }
        }
    }

    public EACCertificateRequestHolder(byte[] certEncoding)
        throws IOException
    {
        this(parseBytes(certEncoding));
    }

    public EACCertificateRequestHolder(CVCertificateRequest request)
    {
        this.request = request;
    }

    /**
     * Return the underlying ASN.1 structure for the certificate in this holder.
     *
     * @return a X509CertificateStructure object.
     */
    public CVCertificateRequest toASN1Structure()
    {
        return request;
    }

    public PublicKeyDataObject getPublicKeyDataObject()
    {
        return request.getPublicKey();
    }

    public boolean isInnerSignatureValid(EACSignatureVerifier verifier)
        throws EACException
    {
        try
        {
            OutputStream vOut = verifier.getOutputStream();

            vOut.write(request.getCertificateBody().getEncoded(ASN1Encoding.DER));

            vOut.close();

            return verifier.verify(request.getInnerSignature());
        }
        catch (Exception e)
        {
            throw new EACException("unable to process signature: " + e.getMessage(), e);
        }
    }
}