The oscrypto.util submodule implements supporting cryptographic functionality. The following functions comprise the public API:

• rand_bytes()
• constant_compare()

def rand_bytes(length):
    """
    :param length:
        The desired number of bytes

    :raises:
        ValueError - when any of the parameters contain an invalid value
        TypeError - when any of the parameters are of the wrong type
        OSError - when an error is returned by the OS crypto library

    :return:
        A byte string
    """

Returns a number of random bytes suitable for cryptographic purposes

def constant_compare(a, b):
    """
    :param a:
        The first byte string

    :param b:
        The second byte string

    :return:
        A boolean if the two byte strings are equal
    """

Compares two byte strings in constant time to see if they are equal