question: public JcaX509v3CertificateBuilder ( X500Name issuer , BigInteger serial , Date notBefore , Date notAfter , X500Name subject , PublicKey publicKey ) { super ( issuer , serial , notBefore , notAfter , subject , SubjectPublicKeyInfo . getInstance ( publicKey . getEncoded ( ) ) ) ; }
target:  Initialise the builder using a PublicKey.