hashutilities.py 文件源码

def create_password_recovery(function, trapdoor_information_size=16, password='',
                             password_prompt="Please enter the password to create a recovery hash: "):
    """ Create a password recovery hash. 
        Returns: function(password + trapdoor_information)

        Presuming the user remembers enough of the password hashed this way, 
        they should be able to recover the password given the hash and the
        trapdoor information. """
    trapdoor_information = random._urandom(trapdoor_information_size)
    return (function(trapdoor_information, 
                     password or getpass.getpass(password_prompt)), 
            trapdoor_information)