# ``twisted`.`conch`.`ssh`.`_kex`.`_IGroupExchangeKexAlgorithm``

interface documentation

`class _IGroupExchangeKexAlgorithm(_IKexAlgorithm): (source)`

Known implementations: `twisted.conch.ssh._kex._DHGroupExchangeSHA1`, `twisted.conch.ssh._kex._DHGroupExchangeSHA256`

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An `_IGroupExchangeKexAlgorithm` describes a key exchange algorithm that uses group exchange between the client and server.

A prime / generator group should be chosen at run time based on the requested size. See RFC 4419.

Inherited from `_IKexAlgorithm`:

Attribute | `hashProcessor` | A callable hash algorithm constructor (e.g. `hashlib.sha256`) suitable for use with this key exchange algorithm.
Attribute | `preference` | An `int` giving the preference of the algorithm when negotiating key exchange. Algorithms with lower precedence values are more preferred.