mirror of https://github.com/Yubico/python-fido2
87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
# Copyright (c) 2013 Yubico AB
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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from base64 import urlsafe_b64decode, urlsafe_b64encode
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import hmac, hashes
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from threading import Timer, Event
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import six
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import numbers
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__all__ = [
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'Timeout',
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'websafe_encode',
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'websafe_decode',
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'sha256',
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'hmac_sha256'
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]
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def sha256(data):
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h = hashes.Hash(hashes.SHA256(), default_backend())
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h.update(data)
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return h.finalize()
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def hmac_sha256(key, data):
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h = hmac.HMAC(key, hashes.SHA256(), default_backend())
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h.update(data)
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return h.finalize()
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def websafe_decode(data):
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if isinstance(data, six.text_type):
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data = data.encode('ascii')
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data += b'=' * (-len(data) % 4)
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return urlsafe_b64decode(data)
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def websafe_encode(data):
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if isinstance(data, six.text_type):
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data = data.encode('ascii')
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return urlsafe_b64encode(data).replace(b'=', b'').decode('ascii')
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class Timeout(object):
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def __init__(self, time_or_event):
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if isinstance(time_or_event, numbers.Number):
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self.event = Event()
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self.timer = Timer(time_or_event, self.event.set)
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else:
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self.event = time_or_event
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self.timer = None
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def __enter__(self):
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if self.timer:
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self.timer.start()
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return self.event
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def __exit__(self, exc_type, exc_val, exc_tb):
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if self.timer:
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self.timer.cancel()
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self.timer.join()
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