#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @author: rui.xu
# @update: jt.huang
# 这里使用pycrypto‎demo库
#https://www.cnblogs.com/huangjianting/p/8666446.html
#https://blog.csdn.net/wang_hugh/article/details/83994750
#https://www.cnblogs.com/sammy1989/p/9663517.html
#https://www.cnblogs.com/chen0307/p/11345601.html
##注：python3 安装 Crypto 是 pip3 install -i https://pypi.tuna.tsinghua.edu.cn/simple pycryptodome<br><br>
from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex
import base64
import re

class PrpCrypt(object):

    def __init__(self, key):
        self.key = key.encode('utf-8')
        self.mode = AES.MODE_CBC

    # 加密函数，如果text不足16位就用空格补足为16位，
    # 如果大于16当时不是16的倍数，那就补足为16的倍数。
    def encrypt(self, text):
        text = text.encode('utf-8')
        cryptor = AES.new(self.key, self.mode, b'0000000000000000')
        # 这里密钥key 长度必须为16（AES-128）,
        # 24（AES-192）,或者32 （AES-256）Bytes 长度
        # 目前AES-128 足够目前使用
        length = 16
        count = len(text)
        if count < length:
            add = (length - count)
            # \0 backspace
            # text = text + ('\0' * add)
            text = text + ('\0' * add).encode('utf-8')
        elif count > length:
            add = (length - (count % length))
            # text = text + ('\0' * add)
            text = text + ('\0' * add).encode('utf-8')
        self.ciphertext = cryptor.encrypt(text)
        # 因为AES加密时候得到的字符串不一定是ascii字符集的，输出到终端或者保存时候可能存在问题
        # 所以这里统一把加密后的字符串转化为16进制字符串
        # return b2a_hex(self.ciphertext)
        return  base64.b64encode(self.ciphertext);

    # 解密后，去掉补足的空格用strip() 去掉
    def decrypt(self, text):
        cryptor = AES.new(self.key, self.mode, b'0000000000000000')
        decryptByts = base64.b64decode(text)
        plain_text = cryptor.decrypt(decryptByts)
        result = re.compile('\n\reS80\x1c\x07\'\x018lBf~\x7f').sub('{"errcode":', plain_text.decode())

        result = result.replace("\n","")
        result = result.replace("\t", "")
        #
        #
        return result.replace("","").replace("","")


if __name__ == '__main__':
    pc = PrpCrypt('CJGD@0qv0D*MMP*7')  # 初始化密钥
    # d = pc.decrypt("0VyJcW31Tj0d0eGXcGbpAeHTqcrKqYZIxTqUQGSiAZ8xDAm687ePSPwkeZgX4Eps379Ryh5UZFFjw8/Dh24RLRcl2cGUO7g+nQb1sP4eXH6e6PdiWlcXk8M3miq0dgHRvMBzdk/eJECHBefGR7ZbOQ==")  # 解密
    #
    e = pc.encrypt('{"errcode1":"-1",  "errmsg" : "请输入产品编号",  "traceId" : "174.132.15889293825631683"}')  # 加密
    print("加密:", e)
    d = pc.decrypt(e);
    print("解密:", d)
    # d = pc.decrypt(d)
    # print("解密:", d)