AttributeError：加密实例没有属性'__getitem__'

Question

我正在创建一个像crytography代码一样的AES，我有我需要帮助的错误。

 File "C:\Users\work\Desktop\try.py", line 156, in byte_construct 
     if (pos & array_8[i]): 
    AttributeError: Encryption instance has no attribute '__getitem__' 

我不断收到上面的错误。可以有人给我一个解决方案。以下是我的源

def rotate_byte_left(byte): 
    value = 0x00 
    value = byte & 0x80 
    byte = byte << 1 
    byte = byte & 0xFF 
    if value == 0x80: 
     byte = byte | 0x01 
    return byte 

def rotate_byte_right(byte): 
    value = 0x00 
    value = byte & 0x01 
    byte = byte >> 1 
    byte = byte & 0xFF 
    if value == 0x01: 
     byte = byte | 0x80 
    return byte 

def byte_construct(array_8,bit_pos): 
    byte = 0x00 
    for p in bit_pos: 
     pos = (0x01 << p) 
    for i in range(0,8): Specifically the error is poiting here. 
     if (pos & array_8[i]): 
      byte = byte & (0x01 << bit_pos) 
    return byte 

def addRoundKey(self, state, roundKey): 
    """Adds (XORs) the round key to the state.""" 
    for i in range(0, len(state)): 
     state[i] ^= roundKey[i] 
    return state  

def ecb(self, plaintext, key): 
    start = time.time() 
    pre_round1 = self.convert_hex_to_list(plaintext^key) 
    substitution_result = self.subBytes(pre_round1, False) 
    permutaion_result = self.byte_construct(substitution_result) 

if __name__ == "__main__": 
    encrypt = Encryption() 
    encrypt.ecb(0x0000000000000000, 0x00FF00FF00FF00FF) 
    print encrypt.convert_list_to_hex([255,0,255]) 

Answer 1

功能byte_construct()是不是类加密的实例方法，但是你调用它喜欢它是

permutation_result = self.byte_construct(substitution_result) 

这意味着，现在byte_construct将使用self作为它的第一个参数（在这种情况下为array-8）和substitution_result作为其第二个参数（bit_pos）。由于self是一个加密对象，我猜它并不是要编入索引的（即你没有为它定义self.__getitem__()），所以你有上面的错误。