@Override
    public void init(boolean forward) throws CertPathValidatorException {
        if (!forward) {
            certIndex = certs.length - 1;
        } else {
            throw new CertPathValidatorException(
                    "Forward checking not supported");
        }
    }
A <code>PKIXCertPathChecker</code> that uses
Online Certificate Status Protocol (OCSP)

See <a href="http://www.ietf.org/rfc/rfc2560.txt">RFC 2560</a>.

@author Jay Kline
xmppserver/src/main/java/org/jivesoftware/openfire/net/OCSPChecker.java