Crypto.AES 报错 | TypeError: Object type <class 'str'> cannot be passed to C code

一、加密代码

import base64
import zlib
from Crypto.Cipher import AES
from Crypto import Random


BLOCK_SIZE = 16


def pad(s): return s + ((BLOCK_SIZE - len(s) % BLOCK_SIZE) * chr(BLOCK_SIZE - len(s) % BLOCK_SIZE)).encode("utf-8")


class AESCipher:
    def __init__(self, key):

        self.key = key

    def encrypt(self, raw):

        """
        加密
        """

        raw = pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        return iv + cipher.encrypt(raw)


def encode(data, key) -> bytes:

    """
    :param data: 序列化后的数据
    :param key: 加密的 key
    :return: 
    """

    # 压缩
    compress_data = zlib.compress(data)

    # 加密
    aes = AESCipher(key)
    encrypt_data = aes.encrypt(compress_data)

    # 转成Base64编码
    encode_data = base64.b64encode(encrypt_data)
    return encode_data


if __name__ == '__main__':
    key = hashlib.md5(str(time.time()).encode('utf-8')).hexdigest()
    json_data = json.dumps({'data': 'test'})
    encode_data = encode(json_data, key)

二·、报错相关

1、报错信息
    cipher = AES.new(self.key, AES.MODE_CBC, iv)
  File "D:Python37LibCryptoCipherAES.py", line 232, in new
    return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)
  File "D:Python37LibCryptoCipher\__init__.py", line 79, in _create_cipher
    return modes[mode](factory, **kwargs)
  File "D:Python37LibCryptoCipher\_mode_cbc.py", line 274, in _create_cbc_cipher
    cipher_state = factory._create_base_cipher(kwargs)
  File "D:Python37LibCryptoCipherAES.py", line 103, in _create_base_cipher
    result = start_operation(c_uint8_ptr(key),
  File "D:Python37LibCryptoUtil\_raw_api.py", line 144, in c_uint8_ptr
    raise TypeError("Object type %s cannot be passed to C code" % type(data))
TypeError: Object type <class 'str'> cannot be passed to C code


2、报错代码
cipher = AES.new(self.key, AES.MODE_CBC, iv)

三、报错原因

　　AES.new 方法的第一个参数，需要为 bytes/bytearray/memoryview 类型，报错代码中传递的是 字符串 类型，将其转为 bytes 类型即可

四、修改之后

import base64
import zlib
from Crypto.Cipher import AES
from Crypto import Random


BLOCK_SIZE = 16


def pad(s): return s + ((BLOCK_SIZE - len(s) % BLOCK_SIZE) * chr(BLOCK_SIZE - len(s) % BLOCK_SIZE)).encode("utf-8")


class AESCipher:
    def __init__(self, key):

        self.key = key

    def encrypt(self, raw):

        """
        加密
        """

        raw = pad(raw)
        iv = Random.new().read(AES.block_size)
        cipher = AES.new(self.key.encode(), AES.MODE_CBC, iv)       ### 我在这里
        return iv + cipher.encrypt(raw)


def encode(data, key) -> bytes:

    """
    :param data: 序列化后的数据
    :param key: 加密的 key
    :return: 
    """

    # 压缩
    compress_data = zlib.compress(data)

    # 加密
    aes = AESCipher(key)
    encrypt_data = aes.encrypt(compress_data)

    # 转成Base64编码
    encode_data = base64.b64encode(encrypt_data)
    return encode_data


if __name__ == '__main__':
    key = hashlib.md5(str(time.time()).encode('utf-8')).hexdigest()
    json_data = json.dumps({'data': 'test'})
    encode_data = encode(json_data, key)