pwdreader.py 文件源码

def decryptStorage(path, key):
    cipherkey = unhexlify(key)
    with open(path, 'rb') as f:
        iv = f.read(12)
        tag = f.read(16)
        cipher = Cipher(algorithms.AES(cipherkey), modes.GCM(iv, tag), backend=default_backend())
        decryptor = cipher.decryptor()
        data = ''
        while True:
            block = f.read(16)
            # data are not authenticated yet
            if block:
                data = data + decryptor.update(block).decode()
            else:
                break
        # throws exception when the tag is wrong
        data = data + decryptor.finalize().decode()
    return json.loads(data)