method Cipher.prototype.final
Cipher.prototype.final(): BufferDeprecated
Once the cipher.final() method has been called, the Cipher object can no
longer be used to encrypt data. Attempts to call cipher.final() more than
once will result in an error being thrown.
BufferAny remaining enciphered contents. If outputEncoding is specified, a string is returned. If an outputEncoding is not provided, a Buffer is returned.