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。
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。
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.js:
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