How to use the node-opcua-crypto.encryptBufferWithDerivedKeys function in node-opcua-crypto

options.encrypt_buffer = function (chunk) {
        return crypto_utils.encryptBufferWithDerivedKeys(chunk, derivedKeys);
    };

    options.encryptBufferFunc = (chunk: Buffer) => encryptBufferWithDerivedKeys(chunk, derivedKeys);

            encryptBufferFunc: (chunk: Buffer) => encryptBufferWithDerivedKeys(chunk, derivedKeys),
            plainBlockSize: derivedKeys.encryptingBlockSize,

encrypt_buffer: function (chunk) {
                return crypto_utils.encryptBufferWithDerivedKeys(chunk, derivedKeys);
            }
        });