AES-256解密程序

from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding
import base64
import sys


def decrypt_aes(encrypted_text, key):
    """解密数据"""
    # 解码Base64编码的加密数据
    encrypted_data = base64.b64decode(encrypted_text)

    # 提取IV和加密后的数据
    iv = encrypted_data[:16]
    ct = encrypted_data[16:]

    # 创建AES CBC模式的Cipher对象
    cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=default_backend())

    # 解密数据
    decryptor = cipher.decryptor()
    decrypted_padded_data = decryptor.update(ct) + decryptor.finalize()

    # 移除PKCS7填充
    unpadder = padding.PKCS7(128).unpadder()
    decrypted_data = unpadder.update(decrypted_padded_data) + unpadder.finalize()

    # 返回解密后的明文
    return decrypted_data.decode('utf-8')


def main():
    # 获取用户输入的加密文本和密钥