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from __future__ import unicode_literals
from .common import SRPSessionBase
from .utils import int_from_hex
if False: # pragma: no cover
from .context import SRPContext
class SRPServerSession(SRPSessionBase):
role = 'server'
def __init__(self, srp_context, password_verifier, private=None):
"""
:param SRPContext srp_context:
:param st|unicode password_verifier:
:param st|unicode private:
"""
super(SRPServerSession, self).__init__(srp_context, private)
self._password_verifier = int_from_hex(password_verifier)
if not private:
self._this_private = srp_context.generate_server_private()
self._server_public = srp_context.get_server_public(self._password_verifier, self._this_private)
def init_session_key(self):
super(SRPServerSession, self).init_session_key()
premaster_secret = self._context.get_server_premaster_secret(
self._password_verifier, self._this_private, self._client_public, self._common_secret)
self._key = self._context.get_common_session_key(premaster_secret)
def verify_proof(self, key_proof, base64=False):
super(SRPServerSession, self).verify_proof(key_proof)
return self._value_decode(key_proof, base64) == self.key_proof
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