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46 lines
1.2 KiB
46 lines
1.2 KiB
"""Generate cryptographically strong pseudo-random numbers suitable for |
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managing secrets such as account authentication, tokens, and similar. |
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See PEP 506 for more information. |
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https://www.python.org/dev/peps/pep-0506/ |
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Amit nem hasznalok belole azt kivettem! |
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Eredeti forras: https://raw.githubusercontent.com/python/cpython/3.7/Lib/secrets.py |
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""" |
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__all__ = ['choice', 'randbelow', 'randbits', 'SystemRandom', |
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'token_bytes', 'token_hex', 'token_urlsafe', |
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'compare_digest', |
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] |
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import base64 |
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import binascii |
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import os |
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from hmac import compare_digest |
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from random import SystemRandom |
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_sysrand = SystemRandom() |
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randbits = _sysrand.getrandbits |
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choice = _sysrand.choice |
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DEFAULT_ENTROPY = 64 # number of bytes to return by default |
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def token_bytes(nbytes=None): |
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"""Return a random byte string containing *nbytes* bytes. |
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>>> token_bytes(16) #doctest:+SKIP |
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b'\\xebr\\x17D*t\\xae\\xd4\\xe3S\\xb6\\xe2\\xebP1\\x8b'""" |
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if nbytes is None: |
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nbytes = DEFAULT_ENTROPY |
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return os.urandom(nbytes) |
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def token_hex(nbytes=None): |
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"""Return a random text string, in hexadecimal. |
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>>> token_hex(16) #doctest:+SKIP |
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'f9bf78b9a18ce6d46a0cd2b0b86df9da'""" |
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return binascii.hexlify(token_bytes(nbytes)).decode('ascii') |
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