secret-2fa using SystemRandom library

app/secrets.py

@@ -1,56 +0,0 @@
-__all__ = ['choice', 'randbelow', 'randbits', 'SystemRandom',
-           'token_bytes', 'token_hex', 'token_urlsafe',
-           'compare_digest',
-           ]
-
-
-import base64
-import binascii
-import os
-
-from hmac import compare_digest
-from random import SystemRandom
-
-_sysrand = SystemRandom()
-
-randbits = _sysrand.getrandbits
-choice = _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 os.urandom(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')