public function subjectKeyIdentifier(): Ext\SubjectKeyIdentifierExtension
    {
        /** @var Extension\SubjectKeyIdentifierExtension $subjectKeyIdentifier */
        $subjectKeyIdentifier = $this->get(
            Ext\Extension::OID_SUBJECT_KEY_IDENTIFIER);
        return $subjectKeyIdentifier;
    }
public function subjectKeyIdentifier(): Ext\SubjectKeyIdentifierExtension
    {
        /** @var Extension\SubjectKeyIdentifierExtension $subjectKeyIdentifier */
        $subjectKeyIdentifier = $this->get(
            Ext\Extension::OID_SUBJECT_KEY_IDENTIFIER);
        return $subjectKeyIdentifier;
    }
public function subjectKeyIdentifier ( ) : Ext \ SubjectKeyIdentifierExtension { /** @var Extension\SubjectKeyIdentifierExtension $subjectKeyIdentifier */ $ subjectKeyIdentifier = $ this -> get ( Ext \ Extension :: OID_SUBJECT_KEY_IDENTIFIER ) ; return $ subjectKeyIdentifier ; }
Get 'Subject Key Identifier' extension.

@throws \LogicException If extension is not present
@return \X509\Certificate\Extension\SubjectKeyIdentifierExtension
Get Subject Key Identifier extension .