文本 AES 加密解密 (Python、JavaScript)

初衷:

不想公开的内容想借助公开场所传播,这个时候就得加密,然后通过解密获取信息。
我的设想很简单,一个网页的内容,里面记载着不想公开的内容,但是又想通过网络(服务器、博客之类)放在网络上面,方便自己需要的时候查询。
这个时候就得需要把内容加密,然后通过密码解密内容。

xxx011133

效果如同上面的GIF那样。

方案

方案打算采用 AES 算法,加密模式为 CBC,填充为 pkcs5padding 或 pkcs7padding (在网络上说 Java 有些情况最好用 pkcs5padding,所以我 Python 那里用了,然而JavaScript 只能 pkcs7padding,而且效果一致,没有深究下去),数据块应该为 128 位,自定义密码,可自定义偏移量(感觉简单的情况下,默认就好了,如果是高阶就自定义绝对牛逼了),输出为 base64(因为比 hex 字符更少),字符集为 utf8。

可以通过一些在线加密解密网站测试

代码

下面直接放出代码

<!Doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>aes demo</title>
  <style>
  body {
      font-size: 12px;font-family: Arial;
    }
  .content {
      width: 100%;height: auto;word-wrap:break-word;word-break:break-all;overflow: hidden;
    }
  </style>
  <script src="http://code.jquery.com/jquery-1.10.2.js"></script>
  <script src="aes.js"></script>
  <script>
    var theContent = null;
    function Decrypt(str, KEY) {
        var iv = CryptoJS.enc.Utf8.parse('1234567812345678');
        var key = CryptoJS.enc.Utf8.parse(KEY);
        var decrypt = CryptoJS.AES.decrypt(str, key, {iv: iv, mode:CryptoJS.mode.CBC,padding: CryptoJS.pad.Pkcs7});
        return CryptoJS.enc.Utf8.stringify(decrypt).toString();
    }
    function escape2Html(str) {
        var arrEntities={'lt':'<','gt':'>','nbsp':' ','amp':'&','quot':'"'};
        return str.replace(/&(lt|gt|nbsp|amp|quot);/ig,function(all,t){return arrEntities[t];});
    }
    function clickText() {
        var Key = pwdfield.value;
        if (theContent == null) {theContent = document.getElementById("test").innerHTML;}
        var text = Decrypt(theContent, Key);
        console.log("返回的数据:" + text);
        text = escape2Html(text);
        $("#main").html(text);
    }
    </script>
</head>
<body>
    <div id="main" class="content">
        <center><div>请输入正确密码以翻译本文内容:<input type="text" id="pwdfield" value="qwedsazxc123321a"><button onclick="clickText()">解密</button></div></center>
        <hr/>
        <div id="test" class="content">这里显示本地文本内容</div>
    </div>
    <script>$(function(){$("#test").load("777ok.txt");});</script>
</body>
</html>
#-*- coding : utf-8 -*-
# coding: utf-8
#!/usr/bin/env python
#! usr/bin/python #coding=utf-8

import sys
sys.path.append('/usr/local/lib/python3.7/site-packages')

'''
Created on 2018年7月7日
@author: ray
'''
import Crypto.Cipher.AES
import Crypto.Random
import base64
import binascii
class Cipher_AES:
  pad_default = lambda x, y: x + (y - len(x) % y) * " ".encode("utf-8")
  unpad_default = lambda x: x.rstrip()
  pad_user_defined = lambda x, y, z: x + (y - len(x) % y) * z.encode("utf-8")
  unpad_user_defined = lambda x, z: x.rstrip(z)
  pad_pkcs5 = lambda x, y: x + (y - len(x) % y) * chr(y - len(x) % y).encode("utf-8")
  unpad_pkcs5 = lambda x: x[:-ord(x[-1])]
  def __init__(self, key="abcdefgh12345678", iv=Crypto.Random.new().read(Crypto.Cipher.AES.block_size)):
    self.__key = key
    self.__iv = iv
  def set_key(self, key):
    self.__key = key
  def get_key(self):
    return self.__key
  def set_iv(self, iv):
    self.__iv = iv
  def get_iv(self):
    return self.__iv
  def Cipher_MODE_ECB(self):
    self.__x = Crypto.Cipher.AES.new(self.__key.encode("utf-8"), Crypto.Cipher.AES.MODE_ECB)
  def Cipher_MODE_CBC(self):
    self.__x = Crypto.Cipher.AES.new(self.__key.encode("utf-8"), Crypto.Cipher.AES.MODE_CBC, self.__iv.encode("utf-8"))
  def encrypt(self, text, cipher_method, pad_method="", code_method=""):
    if cipher_method.upper() == "MODE_ECB":
      self.Cipher_MODE_ECB()
    elif cipher_method.upper() == "MODE_CBC":
      self.Cipher_MODE_CBC()
    cipher_text = b"".join([self.__x.encrypt(i) for i in self.text_verify(text.encode("utf-8"), pad_method)])
    if code_method.lower() == "base64":
      return base64.encodebytes(cipher_text).decode("utf-8").rstrip()
    elif code_method.lower() == "hex":
      return binascii.b2a_hex(cipher_text).decode("utf-8").rstrip()
    else:
      return cipher_text.decode("utf-8").rstrip()
  def decrypt(self, cipher_text, cipher_method, pad_method="", code_method=""):
    if cipher_method.upper() == "MODE_ECB":
      self.Cipher_MODE_ECB()
    elif cipher_method.upper() == "MODE_CBC":
      self.Cipher_MODE_CBC()
    if code_method.lower() == "base64":
      cipher_text = base64.decodebytes(cipher_text.encode("utf-8"))
    elif code_method.lower() == "hex":
      cipher_text = binascii.a2b_hex(cipher_text.encode("utf-8"))
    else:
      cipher_text = cipher_text.encode("utf-8")
    return self.unpad_method(self.__x.decrypt(cipher_text).decode("utf-8"), pad_method)
  def text_verify(self, text, method):
    while len(text) > len(self.__key):
      text_slice = text[:len(self.__key)]
      text = text[len(self.__key):]
      yield text_slice
    else:
      if len(text) == len(self.__key):
        yield text
      else:
        yield self.pad_method(text, method)
  def pad_method(self, text, method):
    if method == "":
      return Cipher_AES.pad_default(text, len(self.__key))
    elif method == "PKCS5Padding":
      return Cipher_AES.pad_pkcs5(text, len(self.__key))
    else:
      return Cipher_AES.pad_user_defined(text, len(self.__key), method)
  def unpad_method(self, text, method):
    if method == "":
      return Cipher_AES.unpad_default(text)
    elif method == "PKCS5Padding":
      return Cipher_AES.unpad_pkcs5(text)
    else:
      return Cipher_AES.unpad_user_defined(text, method)
    

key = "qwedsazxc123321a"
iv = "1234567812345678"


f = open('777.txt')
text = f.read()
f.close()


cipher_method = "MODE_CBC"
pad_method = "PKCS5Padding"
code_method = "base64"
cipher_text = Cipher_AES(key, iv).encrypt(text, cipher_method, pad_method, code_method)
cipher_text = cipher_text.replace('\n','')
print('['+cipher_text+']')
print(type(cipher_text))
text = Cipher_AES(key, iv).decrypt(cipher_text, cipher_method, pad_method, code_method)
print(text)

参考资料

AES 类的封装出处

参考资料

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aes.js:

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