def _get_exchange_key_ntlm_v2(session_base_key):
return session_base_key<EOL>
[MS-NLMP] v28.0 2016-07-14

4.3.5.1 KXKEY
Calculates the Key Exchange Key for NTLMv2 authentication. Used for signing
and sealing messages. According to docs, 'If NTLM v2 is used,
KeyExchangeKey MUST be set to the given 128-bit SessionBaseKey

:param session_base_key: A session key calculated from the user password
    challenge
:return key_exchange_key: The Key Exchange Key (KXKEY) used to sign and
    seal messages