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secrets.py2.0 KB · 73 lines
"""Generate cryptographically strong pseudo-random numbers suitable formanaging secrets such as account authentication, tokens, and similar. See PEP 506 for more information.https://www.python.org/dev/peps/pep-0506/ """ __all__ = ['choice', 'randbelow', 'randbits', 'SystemRandom',           'token_bytes', 'token_hex', 'token_urlsafe',           'compare_digest',           ]  import base64import binascii from hmac import compare_digestfrom random import SystemRandom _sysrand = SystemRandom() randbits = _sysrand.getrandbitschoice = _sysrand.choice def randbelow(exclusive_upper_bound):    """Return a random int in the range [0, n)."""    if exclusive_upper_bound <= 0:        raise ValueError("Upper bound must be positive.")    return _sysrand._randbelow(exclusive_upper_bound) DEFAULT_ENTROPY = 32  # number of bytes to return by default def token_bytes(nbytes=None):    """Return a random byte string containing *nbytes* bytes.     If *nbytes* is ``None`` or not supplied, a reasonable    default is used.     >>> token_bytes(16)  #doctest:+SKIP    b'\\xebr\\x17D*t\\xae\\xd4\\xe3S\\xb6\\xe2\\xebP1\\x8b'     """    if nbytes is None:        nbytes = DEFAULT_ENTROPY    return _sysrand.randbytes(nbytes) def token_hex(nbytes=None):    """Return a random text string, in hexadecimal.     The string has *nbytes* random bytes, each byte converted to two    hex digits.  If *nbytes* is ``None`` or not supplied, a reasonable    default is used.     >>> token_hex(16)  #doctest:+SKIP    'f9bf78b9a18ce6d46a0cd2b0b86df9da'     """    return binascii.hexlify(token_bytes(nbytes)).decode('ascii') def token_urlsafe(nbytes=None):    """Return a random URL-safe text string, in Base64 encoding.     The string has *nbytes* random bytes.  If *nbytes* is ``None``    or not supplied, a reasonable default is used.     >>> token_urlsafe(16)  #doctest:+SKIP    'Drmhze6EPcv0fN_81Bj-nA'     """    tok = token_bytes(nbytes)    return base64.urlsafe_b64encode(tok).rstrip(b'=').decode('ascii')