java.security.cert
Interfaces 
X509Extension
Classes 
Certificate
CertificateFactory
CertificateFactorySpi
CRL
X509Certificate
X509CRL
X509CRLEntry
Exceptions 
CertificateEncodingException
CertificateException
CertificateExpiredException
CertificateNotYetValidException
CertificateParsingException
CRLException