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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 are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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.ieee1609dot2.CertificateBase;
import org.bouncycastle.oer.its.ieee1609dot2.IssuerIdentifier;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.PublicEncryptionKey;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.Signature;
import org.bouncycastle.oer.its.template.ieee1609dot2.IEEE1609dot2;
import org.bouncycastle.operator.ContentVerifier;
import org.bouncycastle.util.Encodable;

public class ITSCertificate
    implements Encodable
{
    private final CertificateBase certificate;

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

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

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

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

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

        return null;
    }

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

        OutputStream verOut = contentVerifier.getOutputStream();


        verOut.write(
            OEREncoder.toByteArray(certificate.getToBeSigned(),
                IEEE1609dot2.ToBeSignedCertificate.build()));

        verOut.close();

        Signature sig = certificate.getSignature();

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

    public CertificateBase toASN1Structure()
    {
        return certificate;
    }

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