PyCryptoDome Version 3.6.6 raises an TypeError: Object type <class 'str'> cannot be passed to C code

Question

几年前，我使用 PyCryptoDome 版本 2.6.1 在 python 中创建了一个密码模块。

现在有了新的 PyCryptoDome 版本 3.6.6 和 Python 3.6，我得到了一个带有相同代码的 TypeError。错误在“_init_crypter” - 方法中抛出：

  File "/usr/local/lib/python3.6/dist-packages/Crypto/Cipher/AES.py", line 206, in new
    return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/Crypto/Cipher/__init__.py", line 79, in _create_cipher
    return modes[mode](factory, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/Crypto/Cipher/_mode_cbc.py", line 253, in _create_cbc_cipher
    return CbcMode(cipher_state, iv)
  File "/usr/local/lib/python3.6/dist-packages/Crypto/Cipher/_mode_cbc.py", line 96, in __init__
    c_uint8_ptr(iv),
  File "/usr/local/lib/python3.6/dist-packages/Crypto/Util/_raw_api.py", line 196, 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

我该如何解决这个问题！

我的两个版本的代码：

import os
from base64 import b64encode, b64decode
import hashlib
from Crypto.Cipher import Blowfish, AES


class Crypt:

    fileextension = ".enc"

    def __init__(self, crypter, key="", encoding="utf-8"):
        self._mode = -1
        self._encoding = encoding
        self._crypter = Blowfish
        self._blocksize = 8
        self._key_32byte = ""
        self._cryptographer = None

        self.set_crypter(crypter)
        if key:
            self.set_key(key)

    def _init_crypter(self):

        # self._key_32byte          <- set in set_key-method
        # self._mode = AES.MODE_CBC <- set in set_crypter-method
        # self._blocksize = 16      <- set in set_crypter-method

        self._cryptographer = self._crypter.new(
            self._key_32byte,
            self._mode,
            IV=self._blocksize * '\x00'
        )

    # and further code ...

Answer 1

键和IV参数必须是二进制类型(bytes)而不是文本类型(str)。

如果您从文件加载密钥，请确保以二进制模式打开它：

with open('keyfile', 'rb') as f:
    ...

如果您的密钥是代码中的文字，请确保它是二进制文字：

key = b'badbadbadkey'

最后，要构造您的 IV 参数，它必须是 bytes.

的序列

例如：

>>> Blowfish.new(b'badbadbadkey', 2, IV=8 * b'\x00')
<Crypto.Cipher._mode_cbc.CbcMode object at 0x7f434187b8d0>

Answer 2

好的 - 几小时后我明白了！只有一个字母解决了这个问题： '\x00' 必须是 b'\x00':

def _init_crypter(self):
    self._cryptographer = self._crypter.new(
        self._key_32byte,
        self._mode,
        IV=self._blocksize * b'\x00'
    )

PyCryptoDome Version 3.6.6 raises an TypeError: Object type <class 'str'> cannot be passed to C code

PyCryptoDome Version 3.6.6 raises an TypeError: Object type <class 'str'> cannot be passed to C code

python

pycryptodome