使用 AES 算法对字符串进行解密，Python 代码片段如下：

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import base64
from Crypto.Cipher import AES

def aes_decrypt(encrypted_str):
    """使用AES加密算法对encrypted_str进行解密"""
    bt = encrypted_str.encode()
    base64_code = base64.b64decode(bt)
    aes = AES.new(key=encoding_aes_key.encode(), mode=AES.MODE_CBC, iv=iv.encode())
    decrypted = aes.decrypt(base64_code)

    # 移除padding并解码
    padding_length = decrypted[-1]
    removed_padding = decrypted[:-padding_length]

    # 返回明文字符串
    return removed_padding.decode()

在本地运行没有异常，在测试服务器上运行时出现 TypeError: ‘iv’ is an invalid keyword argument for this function 异常，具体日志信息如下：

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Traceback (most recent call last):
  File "app.py", line 7, in <module>
    import ynservice
  File "/data/wechat-api/ynservice.py", line 153, in <module>
    process(t_d)
  File "/data/wechat-api/ynservice.py", line 89, in process
    decrypted_str = aes_decrypt(encoding_content)
  File "/data/wechat-api/ynservice.py", line 54, in aes_decrypt
    aes = AES.new(key=encoding_aes_key.encode(), mode=AES.MODE_CBC, iv=iv.encode())
  File "/usr/local/lib64/python3.6/site-packages/Crypto/Cipher/AES.py", line 95, in new
    return AESCipher(key, *args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/Crypto/Cipher/AES.py", line 59, in __init__
    blockalgo.BlockAlgo.__init__(self, _AES, key, *args, **kwargs)
  File "/usr/local/lib64/python3.6/site-packages/Crypto/Cipher/blockalgo.py", line 141, in __init__
    self._cipher = factory.new(key, *args, **kwargs)
TypeError: 'iv' is an invalid keyword argument for this function

通常，该问题一般都是与 pycrypto 的软件包冲突有关。

这里先尝试卸载 pycrypto 包，再安装 pycryptodome 包即可，相关命令如下：

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# 缷载pycrypto包
pip3 uninstall pycrypto

# 安装pycryptodome包
pip3 install pycryptodome

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