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# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Interface to handle end to end flow of U2F signing."""
import sys
class BaseAuthenticator(object):
"""Interface to handle end to end flow of U2F signing."""
def Authenticate(self, app_id, challenge_data,
print_callback=sys.stderr.write):
"""Authenticates app_id with a security key.
Executes the U2F authentication/signature flow with a security key.
Args:
app_id: The app_id to register the security key against.
challenge_data: List of dictionaries containing a RegisteredKey ('key')
and the raw challenge data ('challenge') for this key.
print_callback: Callback to print a message to the user. The callback
function takes one argument--the message to display.
Returns:
A dictionary with the following fields:
'clientData': url-safe base64 encoded ClientData JSON signed by the key.
'signatureData': url-safe base64 encoded signature.
'applicationId': application id.
'keyHandle': url-safe base64 encoded handle of the key used to sign.
Raises:
U2FError: There was some kind of problem with registration (e.g.
the device was already registered or there was a timeout waiting
for the test of user presence).
"""
raise NotImplementedError
def IsAvailable(self):
"""Indicates whether the authenticator implementation is available to sign.
The caller should not call Authenticate() if IsAvailable() returns False
Returns:
True if the authenticator is available to sign and False otherwise.
"""
raise NotImplementedError
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