python aes cbc

Python中实现AES CBC加密需要安装pycryptodome模块，安装方法为pip install pycryptodome。CBC加密需要一个十六位的key(密钥)和一个十六位iv(偏移量)。以下是一个Python实现AES CBC加密的例子：

# 导入pycryptodome模块中的AES和CBC模块
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad

# 定义加密函数
def encrypt(key, iv, plaintext):
    # 将key和iv转换为bytes类型
    key = key.encode('utf-8')
    iv = iv.encode('utf-8')
    # 创建AES CBC加密器
    cipher = AES.new(key, AES.MODE_CBC, iv)
    # 对明文进行填充
    plaintext = pad(plaintext.encode('utf-8'), AES.block_size)
    # 加密明文
    ciphertext = cipher.encrypt(plaintext)
    # 返回加密后的密文
    return ciphertext.hex()

# 定义解密函数
def decrypt(key, iv, ciphertext):
    # 将key和iv转换为bytes类型
    key = key.encode('utf-8')
    iv = iv.encode('utf-8')
    # 创建AES CBC解密器
    cipher = AES.new(key, AES.MODE_CBC, iv)
    # 解密密文
    plaintext = cipher.decrypt(bytes.fromhex(ciphertext))
    # 对解密后的明文进行去填充
    plaintext = unpad(plaintext, AES.block_size)
    # 返回解密后的明文
    return plaintext.decode('utf-8')

# 测试加密和解密函数
key = '1234567890123456'
iv = '1234567890123456'
plaintext = 'Hello, world!'
ciphertext = encrypt(key, iv, plaintext)
print('加密后的密文为：', ciphertext)
decrypted_plaintext = decrypt(key, iv, ciphertext)
print('解密后的明文为：', decrypted_plaintext)