question: return the serial number of this attribute certificate . concode_field_sep X509Extensions extensions concode_elem_sep X509CertificateStructure x509Certificate concode_field_sep int getVersion concode_elem_sep X500Name getIssuer concode_elem_sep X500Name getSubject concode_elem_sep X509Extension getExtension concode_elem_sep IssuerAndSerialNumber getIssuerAndSerialNumber concode_elem_sep X509CertificateStructure toASN1Structure concode_elem_sep Set getCriticalExtensionOIDs concode_elem_sep byte[] getEncoded concode_elem_sep Set getNonCriticalExtensionOIDs concode_elem_sep boolean isValidOn concode_elem_sep byte[] getSignature concode_elem_sep X509CertificateStructure parseBytes concode_elem_sep boolean hasExtensions concode_elem_sep Date getNotBefore concode_elem_sep SubjectPublicKeyInfo getSubjectPublicKeyInfo concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep AlgorithmIdentifier getSignatureAlgorithm concode_elem_sep List getExtensionOIDs concode_elem_sep Date getNotAfter concode_elem_sep boolean isSignatureValid
target: BigInteger function ( ) { return x509Certificate . getSerialNumber ( ) . getValue ( ) ; }