用AES-256-cbc实现字符串的递归解密

from Crypto.Cipher import AES
import base64

def recursive_decrypt(ciphertext, key):
    cipher = AES.new(key, AES.MODE_CBC)
    decrypted = cipher.decrypt(ciphertext)
    decrypted = decrypted.rstrip(b"\0")  # 去除填充的空字节
    try:
        decrypted = decrypted.decode('utf-8')  # 尝试将解密结果转换为字符串
    except UnicodeDecodeError:
        return recursive_decrypt(decrypted, key)  # 如果解密结果不是有效的字符串，则递归解密
    return decrypted

ciphertext = base64.b64decode("密文字符串")
key = b"256位密钥"

plaintext = recursive_decrypt(ciphertext, key)
print(plaintext)