44 lines
1.8 KiB
Python
44 lines
1.8 KiB
Python
'''
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Onionr - P2P Microblogging Platform & Social network. Run with 'help' for usage.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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import hmac, base64, time, math
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class TimedHMAC:
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def __init__(self, base64Key, data, hashAlgo):
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'''
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base64Key = base64 encoded key
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data = data to hash
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expire = time expiry in epoch
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hashAlgo = string in hashlib.algorithms_available
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Maximum of 10 seconds grace period
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'''
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self.data = data
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self.expire = math.floor(time.time())
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self.hashAlgo = hashAlgo
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self.b64Key = base64Key
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generatedHMAC = hmac.HMAC(base64.b64decode(base64Key).decode(), digestmod=self.hashAlgo)
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generatedHMAC.update(data + expire)
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self.HMACResult = generatedHMAC.hexdigest()
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return
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def check(self, data):
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# Check a hash (and verify time is sane)
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testHash = hmac.HMAC(base64.b64decode(base64Key).decode(), digestmod=self.hashAlgo)
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testHash.update(data + math.floor(time.time()))
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testHash = testHash.hexdigest()
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if hmac.compare_digest(testHash, self.HMACResult):
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return true
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else:
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return false
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