public function authorityKeyIdentifier(): Ext\AuthorityKeyIdentifierExtension
    {
        /** @var Extension\AuthorityKeyIdentifierExtension $keyIdentifier */
        $keyIdentifier = $this->get(Ext\Extension::OID_AUTHORITY_KEY_IDENTIFIER);
        return $keyIdentifier;
    }
public function authorityKeyIdentifier(): Ext\AuthorityKeyIdentifierExtension
    {
        /** @var Extension\AuthorityKeyIdentifierExtension $keyIdentifier */
        $keyIdentifier = $this->get(Ext\Extension::OID_AUTHORITY_KEY_IDENTIFIER);
        return $keyIdentifier;
    }
public function authorityKeyIdentifier ( ) : Ext \ AuthorityKeyIdentifierExtension { /** @var Extension\AuthorityKeyIdentifierExtension $keyIdentifier */ $ keyIdentifier = $ this -> get ( Ext \ Extension :: OID_AUTHORITY_KEY_IDENTIFIER ) ; return $ keyIdentifier ; }
Get 'Authority Key Identifier' extension.

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