Python random.SystemRandom() Examples

def reset_config(self):
        original_items = self.__items__
        try:
            import random
            import string
            # If config file not found, create a new random string as token
            token = ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(32))

            with open(self.config_path, 'w') as outfile:
                with self._mutex:
                    original_items.update(dict(
                            token=token,
                            registered=False,
                            ws_host="wss://www.getanywhere.io",
                            api_host="https://www.getanywhere.io",
                            stream_host="http://stream.getanywhere.io"
                            ))

                    self.__items__ = original_items
                    yaml.dump(self.__items__, outfile, default_flow_style=False)
        except:
            self.sentry.captureException()
            import traceback; traceback.print_exc() 

def insertFuzz(url, fuzz):
    """
        :Description: This function inserts the Fuzz as GET Parameter in the URL 

        :param url: Target URL
        :type type: String
        
        :param fuzz: Fuzzing string
        :type fuzz: String

        :return: The URL with a concatenated string consisting of a random string and the fuzz.
        :note: Some fuzzing symbols can be part of a normal response. In order to distinctly find the fuzz that was sent, a random string is added before the fuzz.

    """

    fuzz = urllib.quote_plus(fuzz) #url encoding
    randomString = ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(6))
    return randomString, url.replace('FUZZ', randomString + str(fuzz)) 

def get_random_secret_key():
    import random
    import hashlib
    import time
    try:
        random = random.SystemRandom()
        using_sysrandom = True
    except NotImplementedError:
        import warnings
        warnings.warn('A secure pseudo-random number generator is not available '
                      'on your system. Falling back to Mersenne Twister.')
        using_sysrandom = False

    chars = 'abcdefghijklmnopqrstuvwxyz0123456789!@#$^&*(-_=+)'
    if not using_sysrandom:
        random.seed(
            hashlib.sha256(
                ("%s%s%s" % (
                    random.getstate(),
                    time.time(),
                    'BioQueue')).encode('utf-8')
            ).digest())
    return ''.join(random.choice(chars) for i in range(50)) 

def get_bigbluebutton_url(request: HttpRequest, user_profile: UserProfile) -> HttpResponse:
    # https://docs.bigbluebutton.org/dev/api.html#create for reference on the api calls
    # https://docs.bigbluebutton.org/dev/api.html#usage for reference for checksum
    id = "zulip-" + str(random.randint(100000000000, 999999999999))
    password = ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(10))
    checksum = hashlib.sha1(("create" + "meetingID=" + id + "&moderatorPW="
                             + password + "&attendeePW=" + password + "a" + settings.BIG_BLUE_BUTTON_SECRET).encode()).hexdigest()
    url = add_query_to_redirect_url("/calls/bigbluebutton/join", urlencode({
        "meeting_id": "\"" + id + "\"",
        "password": "\"" + password + "\"",
        "checksum": "\"" + checksum + "\""
    }))
    return json_success({"url": url})


# We use zulip_login_required here mainly to get access to the user's
# full name from Zulip to prepopulate the user's name in the
# BigBlueButton meeting.  Since the meeting's details are encoded in
# the link the user is clicking, there is no validation tying this
# meeting to the Zulip organization it was created in. 

def split_secret(threshold, total,  secret):
    if not isinstance(secret, bytes):
        raise TypeError("Secret as byte string required")
    if threshold > 255:
        raise ValueError("threshold <= 255")
    if total > 255:
        raise ValueError("total shares <= 255")
    shares = dict()
    for i in range(total):
        shares[i+1] = b""
    for b in secret:
        q = [b]
        for i in range(threshold - 1):
            a = random.SystemRandom().randint(0, 255)
            q.append(a)

        for x in range(total):
            shares[x+1] += bytes([_fn(x + 1, q)])

    return shares 

def generate_entropy(strength=256, hex=True):
    """
    Generate 128-256 bits entropy bytes string

    :param int strength: entropy bits strength, by default is 256 bit.
    :param boolean hex: return HEX encoded string result flag, by default True.
    :return: HEX encoded or bytes entropy string.
    """
    if strength not in [128, 160, 192, 224, 256]:
        raise ValueError('strength should be one of the following [128, 160, 192, 224, 256]')
    a = random.SystemRandom().randint(0, ECDSA_SEC256K1_ORDER)
    i = int((time.time() % 0.01 ) * 100000)
    h = a.to_bytes(32, byteorder="big")
    # more entropy from system timer and sha256 derivation
    while i:
        h = hashlib.sha256(h).digest()
        i -= 1
        if not i and int_from_bytes(h, byteorder="big") > ECDSA_SEC256K1_ORDER:
            i += 1
    return h[:int(strength/8)] if not hex else h[:int(strength/8)].hex() 

def test_main(verbose=None):
    testclasses =    [WichmannHill_TestBasicOps,
                      MersenneTwister_TestBasicOps,
                      TestDistributions,
                      TestModule]

    try:
        random.SystemRandom().random()
    except NotImplementedError:
        pass
    else:
        testclasses.append(SystemRandom_TestBasicOps)

    test_support.run_unittest(*testclasses)

    # verify reference counting
    import sys
    if verbose and hasattr(sys, "gettotalrefcount"):
        counts = [None] * 5
        for i in xrange(len(counts)):
            test_support.run_unittest(*testclasses)
            counts[i] = sys.gettotalrefcount()
        print counts 

def test_main(verbose=None):
    testclasses =    [WichmannHill_TestBasicOps,
                      MersenneTwister_TestBasicOps,
                      TestDistributions,
                      TestModule]

    try:
        random.SystemRandom().random()
    except NotImplementedError:
        pass
    else:
        testclasses.append(SystemRandom_TestBasicOps)

    test_support.run_unittest(*testclasses)

    # verify reference counting
    import sys
    if verbose and hasattr(sys, "gettotalrefcount"):
        counts = [None] * 5
        for i in xrange(len(counts)):
            test_support.run_unittest(*testclasses)
            counts[i] = sys.gettotalrefcount()
        print counts 

def test_main(verbose=None):
    testclasses =    [WichmannHill_TestBasicOps,
                      MersenneTwister_TestBasicOps,
                      TestDistributions,
                      TestModule]

    try:
        random.SystemRandom().random()
    except NotImplementedError:
        pass
    else:
        testclasses.append(SystemRandom_TestBasicOps)

    test_support.run_unittest(*testclasses)

    # verify reference counting
    import sys
    if verbose and hasattr(sys, "gettotalrefcount"):
        counts = [None] * 5
        for i in xrange(len(counts)):
            test_support.run_unittest(*testclasses)
            counts[i] = sys.gettotalrefcount()
        print counts 

def _get_random_username_from_email(email):
    localpart = email.split('@')[0]
    cleaned_localpart = re.sub(r'[^\w]', '-', localpart).lower()

    # if we can't create a unique user name within this many attempts
    # then something else is probably wrong and we should give up
    max_name_creation_attempts = 100

    for i in range(max_name_creation_attempts):
        random_number = random.SystemRandom().random() * 10000
        name = '%s-%d' % (cleaned_localpart, random_number)
        if not ckan.model.User.get(name):
            return name

    return cleaned_localpart


## Modifications for rest api 

def setParams(params, fuzz):
    """
        :Description: This function sets the Fuzz in the POST Parameter.

        :param url: Target URL
        :type type: String
        
        :param fuzz: Fuzzing string
        :type fuzz: String

        :return: The post parameter with a concatenated string consisting of a random string and the fuzz
        :note: Some fuzzing symbols can be part of a normal response. In order to distinctly find the fuzz that was sent, a random string is added before the fuzz.

    """
    
    randomString = ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(6))
    parameter = copy.deepcopy(params) #makes a deep copy. this is needed because using a reference does not work
    for param in parameter:
        if parameter[param] == 'FUZZ':
            parameter[param] = randomString + str(fuzz)
    return randomString, parameter; 

def get_engine_arguments(self, engine):
    """Return a list of fuzzer options."""
    arguments = {}
    for option_name, option_value in six.iteritems(
        self._get_option_section(engine)):
      # Check option value for usage of random() function.
      match = self.OPTIONS_RANDOM_REGEX.match(option_value)
      if match:
        min_value, max_value = match.groups()
        option_value = str(random.SystemRandom().randint(
            int(min_value), int(max_value)))

      if option_name == 'dict':
        option_value = self._get_dict_path(option_value)

      arguments[option_name] = option_value

    return FuzzerArguments(arguments) 

def _get_fuzzer_binary_name_and_path(self):
    """Returns the fuzzer binary name and its path."""
    # Fuchsia doesn't use file paths to call fuzzers, just the name of the
    # fuzzer, so we set both from FUZZ_TARGET here.
    if environment.platform() == 'FUCHSIA':
      fuzzer_binary_name = fuzzer_path = environment.get_value('FUZZ_TARGET')
      return fuzzer_binary_name, fuzzer_path
    build_directory = environment.get_value('BUILD_DIR')

    if not build_directory:
      raise BuiltinFuzzerException('BUILD_DIR environment variable is not set.')

    fuzzers = fuzzers_utils.get_fuzz_targets(build_directory)

    if not fuzzers:
      raise BuiltinFuzzerException(
          'No fuzzer binaries found in |BUILD_DIR| directory.')

    fuzzer_binary_name = environment.get_value('FUZZ_TARGET')
    if fuzzer_binary_name:
      fuzzer_path = _get_fuzzer_path(fuzzers, fuzzer_binary_name)
    else:
      fuzzer_path = random.SystemRandom().choice(fuzzers)
      fuzzer_binary_name = os.path.basename(fuzzer_path)
    return fuzzer_binary_name, fuzzer_path 

def random_string(n=10):
    return ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(n)) 

def generate():
    """
    Generates the key.
    """
    uni = string.ascii_letters + string.digits + string.punctuation
    key = ''.join([random.SystemRandom().choice(uni) for i in range(random.randint(45, 50))])
    return key 

def run_kmeans(ann_dims, anchor_num):
    ann_num = ann_dims.shape[0]
    prev_assignments = np.ones(ann_num)*(-1)
    iteration = 0
    old_distances = np.zeros((ann_num, anchor_num))

    r = random.SystemRandom()
    indices = [r.randrange(ann_dims.shape[0]) for i in range(anchor_num)]
    centroids = ann_dims[indices]
    anchor_dim = ann_dims.shape[1]

    while True:
        distances = []
        iteration += 1
        for i in range(ann_num):
            d = 1 - iou(ann_dims[i], centroids)
            distances.append(d)
        distances = np.array(distances) # distances.shape = (ann_num, anchor_num)

        print("iteration {}: dists = {}".format(iteration, np.sum(np.abs(old_distances-distances))))

        #assign samples to centroids
        assignments = np.argmin(distances, axis=1)

        if (assignments == prev_assignments).all():
            return centroids

        #calculate new centroids
        centroid_sums = np.zeros((anchor_num, anchor_dim), np.float)
        for i in range(ann_num):
            centroid_sums[assignments[i]] += ann_dims[i]
        for j in range(anchor_num):
            centroids[j] = centroid_sums[j]/(np.sum(assignments == j) + 1e-6)

        prev_assignments = assignments.copy()
        old_distances = distances.copy() 

def generate_token(self, *args, **kwargs):
        r = random.SystemRandom()

        # generate a random number between min_number and max_number
        return str(r.randint(self.min_number, self.max_number)) 

def random_name(prefix, N):
    # create a name with random characters and digits
    return prefix + ''.join(
        random.SystemRandom().choice(
            string.ascii_uppercase + string.digits) for _ in range(N)) 

def __init__(self):
        self.rng = random.SystemRandom() 

def generate_client_id():
    return "%x" % random.SystemRandom().getrandbits(0x58) 

def new_guid():
    return "%x" % random.SystemRandom().getrandbits(0x58) 

def _random_extension(length=5):
    return '.' + ''.join(SystemRandom().choice(ascii_letters) for _ in range(length)) 

def get_random_string(lenght=12, allowed_chars=None):
    random_gen = random.SystemRandom()
    if allowed_chars is None:
        allowed_chars = string.ascii_letters + string.digits
    return ''.join([random_gen.choice(allowed_chars) for _ in range(lenght)]) 

def random_label():
        return ''.join(random.SystemRandom().choice('abcdefgijklmnoprstuvwxyz1234567890') for _ in range(8)) 

def random_pause_time(max_seconds=3):
    """Generates a random pause time between 0.0 and 10.0, limited by max_seconds.

    :param int max_seconds: Maximum pause time (default: 3)
    :rtype: float
    """
    return SystemRandom().random() * 10 % max_seconds 

def _transfer_key_generator(self, size=8):
        chars = string.ascii_uppercase + string.digits
        sysrand = SystemRandom()
        return ''.join(sysrand.choice(chars) for _ in range(size)) 

def generateTempTableName():
    rng = random.SystemRandom()
    suffix = ''
    for _ in range(0, 10):
        suffix += rng.choice(
            'abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
    return "TEMP" + suffix + str(int(time.time())) 

def generate_build_key():
    return random.SystemRandom().randint(0, 2000000000) 

def _random_extension(length=5):
    return '.' + ''.join(SystemRandom().choice(ascii_letters) for _ in range(length)) 

def enc(m):
    M = int(binascii.hexlify(m), 16)
    assert len(bin(M)) < len(bin(p)), 'm too long'

    y = random.SystemRandom().randint(0, p-1)
    c1 = pow(g, y, p)
    c2 = (M * pow(h, y, p) ) % p 

    return c1, c2