question: return a recipientid for the identity 's private key , certificate pair . concode_field_sep X509CertificateHolder[] certificateHolders concode_elem_sep PrivateKeyInfo privateKeyInfo concode_field_sep X509CertificateHolder getCertificate concode_elem_sep PrivateKeyInfo getPrivateKeyInfo concode_elem_sep byte[] getSubjectKeyIdentifier
target: RecipientId function ( ) { return new KeyTransRecipientId ( certificateHolders [ 0 ] . getIssuer ( ) , certificateHolders [ 0 ] . getSerialNumber ( ) , getSubjectKeyIdentifier ( ) ) ; }