org.bouncycastle.cert
Classes 
AttributeCertificateHolder
AttributeCertificateIssuer
X509AttributeCertificateHolder
X509CertificateHolder
X509CRLEntryHolder
X509CRLHolder
X509v1CertificateBuilder
X509v2AttributeCertificateBuilder
X509v2CRLBuilder
X509v3CertificateBuilder
Exceptions 
CertException
CertIOException