AttributeError：加密实例没有属性＆＃39; __ getitem __＆＃39;

Question

我想创建一个像crytography代码的AES，我遇到了需要帮助的错误。

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

我不断收到上述错误。有人可以给我一个解决方案。以下是我的来源

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

函数byte_construct()不是加密类的实例方法，但是你正在调用它

permutation_result = self.byte_construct(substitution_result)

这意味着现在byte_construct将self作为其第一个参数（在本例中为array-8），substitution_result作为其第二个参数（{{1} }}）。由于bit_pos是一个加密对象，我猜测它不是要编入索引（即你没有为它定义self），你已经得到了上述内容错误。