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# ``twisted`.`conch`.`ssh`.`transport`.`_MACParams``

class documentation

`class _MACParams(Tuple[_DigestMod, bytes, bytes, int]): (source)`

View In Hierarchy

`_MACParams` represents the parameters necessary to compute SSH MAC (Message Authenticate Codes).

`_MACParams` is a `tuple` subclass to maintain compatibility with older versions of the code. The elements of a `_MACParams` are:

        0. The digest object used for the MAC
        1. The inner pad ("ipad") string
        2. The outer pad ("opad") string
        3. The size of the digest produced by the digest object

`_MACParams` is also an object lesson in why tuples are a bad type for public APIs.

Instance Variable | `key` | The HMAC key which will be used.

key: `bytes` = (source)

The HMAC key which will be used.