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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.CVCertificate;
import org.bouncycastle.asn1.eac.PublicKeyDataObject;
import org.bouncycastle.eac.operator.EACSignatureVerifier;

public class EACCertificateHolder
{
    private CVCertificate cvCertificate;

    private static CVCertificate parseBytes(byte[] certEncoding)
        throws IOException
    {
        try
        {
            return CVCertificate.getInstance(certEncoding);
        }
        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 EACCertificateHolder(byte[] certEncoding)
        throws IOException
    {
        this(parseBytes(certEncoding));
    }

    public EACCertificateHolder(CVCertificate cvCertificate)
    {
        this.cvCertificate = cvCertificate;
    }

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

    public PublicKeyDataObject getPublicKeyDataObject()
    {
        return cvCertificate.getBody().getPublicKey();
    }

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

            vOut.write(cvCertificate.getBody().getEncoded(ASN1Encoding.DER));

            vOut.close();

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