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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.its.operator.ECDSAEncoder;
import org.bouncycastle.its.operator.ITSContentVerifierProvider;
import org.bouncycastle.oer.OEREncoder;
import org.bouncycastle.oer.its.Certificate;
import org.bouncycastle.oer.its.IssuerIdentifier;
import org.bouncycastle.oer.its.PublicEncryptionKey;
import org.bouncycastle.oer.its.Signature;
import org.bouncycastle.oer.its.template.IEEE1609dot2;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.util.Encodable;

public class ITSCertificate
    implements Encodable
{
    private final Certificate certificate;

    public ITSCertificate(Certificate certificate)
    {
        this.certificate = certificate;
    }

    public IssuerIdentifier getIssuer()
    {
        return certificate.getCertificateBase().getIssuer();
    }

    public ITSValidityPeriod getValidityPeriod()
    {
        return new ITSValidityPeriod(certificate.getCertificateBase().getToBeSignedCertificate().getValidityPeriod());
    }

    /**
     * Return the certificate's public encryption key, if present.
     *
     * @return 
     */
    public ITSPublicEncryptionKey getPublicEncryptionKey()
    {
        PublicEncryptionKey encryptionKey = certificate.getCertificateBase().getToBeSignedCertificate().getEncryptionKey();

        if (encryptionKey != null)
        {
            return new ITSPublicEncryptionKey(encryptionKey);
        }

        return null;
    }

    public boolean isSignatureValid(ITSContentVerifierProvider verifierProvider)
        throws Exception
    {
        ContentVerifier contentVerifier = verifierProvider.get(certificate.getCertificateBase().getSignature().getChoice());

        OutputStream verOut = contentVerifier.getOutputStream();


        verOut.write(
            OEREncoder.toByteArray(certificate.getCertificateBase().getToBeSignedCertificate(),
                IEEE1609dot2.tbsCertificate));

        verOut.close();

        Signature sig = certificate.getCertificateBase().getSignature();

        return contentVerifier.verify(ECDSAEncoder.toX962(sig));
    }

    public Certificate toASN1Structure()
    {
        return certificate;
    }

    public byte[] getEncoded()
        throws IOException
    {
        return OEREncoder.toByteArray(certificate.getCertificateBase(), IEEE1609dot2.certificate);
    }
}