entropy.py 文件源码

def __init__(self, seed=None):
        self.pool_index = 0
        self.digest = None
        self.next_byte = 0
        self.lock = _threading.Lock()
        try:
            import hashlib
            self.hash = hashlib.sha1()
            self.hash_len = 20
        except:
            try:
                import sha
                self.hash = sha.new()
                self.hash_len = 20
            except:
                import md5
                self.hash = md5.new()
                self.hash_len = 16
        self.pool = bytearray(b'\0' * self.hash_len)
        if seed is not None:
            self.stir(bytearray(seed))
            self.seeded = True
        else:
            self.seeded = False