question: public CertId ( DerInputStream derIn ) throws IOException { hashAlgId = AlgorithmId . parse ( derIn . getDerValue ( ) ) ; issuerNameHash = derIn . getOctetString ( ) ; issuerKeyHash = derIn . getOctetString ( ) ; certSerialNumber = new SerialNumber ( derIn ) ; }
target:  Creates a CertId from its ASN.1 DER encoding.