public AuthorityKeyIdentifierStructure(X509Certificate certificate) throws CertificateParsingException {
  super(fromCertificate(certificate));
}

public AuthorityKeyIdentifierStructure ( X509Certificate certificate ) throws CertificateParsingException { super ( fromCertificate ( certificate ) ) ; }
create an authoritykeyidentifier using the passed in certificate ' s public key , issuer and serial number .
