3des加解密cbc模式python

可以使用Python中的pycryptodome库实现3DES加解密和CBC模式。具体步骤如下：
1. 导入pycryptodome库：

from Crypto.Cipher import DES3
from Crypto.Util.Padding import pad, unpad

2. 创建3DES加解密函数：

def des3_encrypt(key, plain_text):
    cipher = DES3.new(key, DES3.MODE_CBC)
    cipher_text = cipher.encrypt(pad(plain_text, DES3.block_size))
    iv = cipher.iv
    return cipher_text, iv

def des3_decrypt(key, cipher_text, iv):
    cipher = DES3.new(key, DES3.MODE_CBC, iv=iv)
    plain_text = unpad(cipher.decrypt(cipher_text), DES3.block_size)
    return plain_text

3. 调用加解密函数：

key = b'123456781234567812345678'
plain_text = b'hello world'
cipher_text, iv = des3_encrypt(key, plain_text)
recovered_text = des3_decrypt(key, cipher_text, iv)

其中，key为密钥，plain_text为待加密的明文，cipher_text为加密后的密文，iv为初始化向量，recovered_text为解密后的明文。