async def open_secure_channel(self, renew=False):
"""
Open secure channel, if renew is True, renew channel
"""
params = ua.OpenSecureChannelParameters()
params.ClientProtocolVersion = 0
params.RequestType = ua.SecurityTokenRequestType.Issue
if renew:
params.RequestType = ua.SecurityTokenRequestType.Renew
params.SecurityMode = self.security_policy.Mode
params.RequestedLifetime = self.secure_channel_timeout
# length should be equal to the length of key of symmetric encryption
params.ClientNonce = create_nonce(self.security_policy.symmetric_key_size)
result = await self.uaclient.open_secure_channel(params)
if self.secure_channel_timeout != result.SecurityToken.RevisedLifetime:
_logger.info("Requested secure channel timeout to be %dms, got %dms instead", self.secure_channel_timeout, result.SecurityToken.RevisedLifetime)
self.secure_channel_timeout = result.SecurityToken.RevisedLifetime
async def open_secure_channel(self, renew=False):
"""
Open secure channel, if renew is True, renew channel
"""
params = ua.OpenSecureChannelParameters()
params.ClientProtocolVersion = 0
params.RequestType = ua.SecurityTokenRequestType.Issue
if renew:
params.RequestType = ua.SecurityTokenRequestType.Renew
params.SecurityMode = self.security_policy.Mode
params.RequestedLifetime = self.secure_channel_timeout
# length should be equal to the length of key of symmetric encryption
nonce = create_nonce(self.security_policy.symmetric_key_size)
params.ClientNonce = nonce # this nonce is used to create a symmetric key
result = await self.uaclient.open_secure_channel(params)
self.security_policy.make_symmetric_key(nonce, result.ServerNonce)
self.secure_channel_timeout = result.SecurityToken.RevisedLifetime
