import base64
from Crypto.Cipher import DES
from Crypto.Util.Padding import pad, unpad


def des_encrypt(plain_text):
    cipher = DES.new(des_key, DES.MODE_CBC, iv)
    encrypted = cipher.encrypt(pad(plain_text.encode("utf-8"), DES.block_size))
    return base64.b64encode(encrypted)


def des_decrypt(cipher_text):
    cipher = DES.new(des_key, DES.MODE_CBC, iv)
    decrypt_byte_data = base64.b64decode(cipher_text)
    decrypted = unpad(cipher.decrypt(decrypt_byte_data), DES.block_size)
    return decrypted.decode("utf-8")


source_data = "你好，世界！"
des_key = "12345678".encode("utf-8")
iv = "12345678".encode("utf-8")
if __name__ == "__main__":
    enc_data = des_encrypt(source_data)
    print(enc_data)
    print(des_decrypt(des_encrypt(source_data)))