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24 lines
533 B
24 lines
533 B
6 years ago
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import json
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import base64
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import hmac
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from Crypto.Cipher import AES
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def _strcmp(a, b):
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"""Compares two strings while preventing timing attacks. Execution time
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is not affected by lenghth of common prefix on strings of the same length"""
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return not sum(0 if x==y else 1 for x, y in zip(a, b)) and len(a) == len(b)
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class SecureSession(object):
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def __init__(self):
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json()
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base64.b64encode(hmac.new(tob(key), msg).digest())):
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return pickle.loads(base64.b64decode(msg))
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