and `OCB` are currently supported), the `cipher.getAuthTag()` method returns a

[`Buffer`][] containing the _authentication tag_ that has been computed from

the given data.

* `encoding` {string} The string encoding to use when `buffer` is a string.

* Returns: {Cipher} for method chaining.

currently supported), the `cipher.setAAD()` method sets the value used for the

_additional authenticated data_ (AAD) input parameter.

* `encoding` {string} String encoding to use when `buffer` is a string.

* Returns: {Decipher} for method chaining.

currently supported), the `decipher.setAAD()` method sets the value used for the

_additional authenticated data_ (AAD) input parameter.

* `encoding` {string} String encoding to use when `buffer` is a string.

* Returns: {Decipher} for method chaining.

currently supported), the `decipher.setAuthTag()` method is used to pass in the

received _authentication tag_. If no tag is provided, or if the cipher text

has been tampered with, [`decipher.final()`][] will throw, indicating that the