https://my.oschina.net/leejun2005/blog/586451

手头有个 Java 版的 DES 加密/解密程序，最近想着将其 Python 重构下，方便后续脚本解析，捣鼓了两下 pyDes 貌似很方便，不过据网上其他同学测试说 PyCrypto 性能要比 pyDes 高一个数量级，这里我没有做具体性能测试，也没有选用 PyCrypto 主要原因有三：

（1）PyCrypto 在 windows 下依赖 VC++9.0，安装麻烦 

（2）PyCrypto 默认不支持 padmode，且对秘钥以及偏转向量长度有严格要求，扩展性很差

（3）不是用来搞暴力破解，性能要求不高，所以就不关注性能了，能用就行  ^ _ ^

下面直接上代码吧~

1、Java 版

public class EncryptHelper {private static String strKey = "test_KEY", strParam = "test__IV";public static String desEncrypt(String source) throws Exception {if (source == null || source.length() == 0)return null;Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");DESKeySpec desKeySpec = new DESKeySpec(strKey.getBytes("UTF-8"));SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey secretKey = keyFactory.generateSecret(desKeySpec);IvParameterSpec iv = new IvParameterSpec(strParam.getBytes("UTF-8"));cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);return StringHelper.toHexString(cipher.doFinal(source.getBytes("UTF-8"))).toUpperCase();}public static String desDecrypt(String source) throws Exception {if (source == null || source.length() == 0)return null;byte[] src = StringHelper.fromHexString(source);Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");DESKeySpec desKeySpec = new DESKeySpec(strKey.getBytes("UTF-8"));SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey secretKey = keyFactory.generateSecret(desKeySpec);IvParameterSpec iv = new IvParameterSpec(strParam.getBytes("UTF-8"));cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);byte[] retByte = cipher.doFinal(src);return new String(retByte);}public static void main(String[] args) throws Exception {System.out.println(EncryptHelper.desDecrypt("886f930f65f29132f6ace2683c448b5580d681a1fec3fc91cf3161f074b53b935d1c8fe80f99201077b36f923a42ac0e05cabe579308fda08d8ff463ad334677"));System.out.println(EncryptHelper.desEncrypt("https://mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361"));} }//结果： //https://mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361 //886F930F65F29132F6ACE2683C448B5580D681A1FEC3FC91CF3161F074B53B935D1C8FE80F99201077B36F923A42AC0E05CABE579308FDA08D8FF463AD334677 2、Python 版 # -*- coding:utf-8 -*- import sysreload(sys) sys.setdefaultencoding('utf-8') from pyDes import * from binascii import b2a_hex, a2b_hex# For Python3, you'll need to use bytes, i.e.: # data = b"Please encrypt my data" # k = des(b"DESCRYPT", CBC, b"\0\0\0\0\0\0\0\0", pad=None, padmode=PAD_PKCS5)data = 'https://mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361' KEY = "test_KEY" #密钥 IV = "test__IV" #偏转向量 # 使用DES对称加密算法的CBC模式加密 k = des(KEY, CBC, IV, pad=None, padmode=PAD_PKCS5) d = k.encrypt(data) print b2a_hex(d) print "Decrypted: %r" % k.decrypt(d)#结果： #886f930f65f29132f6ace2683c448b5580d681a1fec3fc91cf3161f074b53b935d1c8fe80f99201077b36f923a42ac0e05cabe579308fda08d8ff463ad334677 #Decrypted: ' #或者单行命令如下： python -c 'from pyDes import *;from binascii import a2b_hex;import sys;print des("test_KEY", CBC, "test__IV", pad=None, padmode=PAD_PKCS5).decrypt(a2b_hex(sys.stdin.readlines()[0].strip()))' <<<886f930f65f29132f6ace2683c448b5580d681a1fec3fc91cf3161f074b53b935d1c8fe80f99201077b36f923a42ac0e05cabe579308fda08d8ff463ad334677 #https://mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361

 

3、Refer

[1] pyDes库 实现python的des加密

http://www.cnblogs.com/SunboyL/p/pyDes.html

[2] Cryptography and Python

http://lenciel.cn/2013/07/cryptography-and-python/

[3] 加密解密工具类 EncryptUtil

http://uule.iteye.com/blog/1925046

[4] implementing DES-X (mode CBC) using PyCrypto

https://gist.github.com/doublereedkurt/3921909

[5] python 对字符串的加密解密

http://www.simonzhang.net/?p=1903

[6] 数据加密算法

http://baike.baidu.com/view/878529.htm

[7] 非对称加密算法

http://baike.baidu.com/view/1490349.htm

[8] Pycrypto与RSA密码技术笔记

http://python.jobbole.com/84094/

转载于:https://www.cnblogs.com/davidwang456/p/8964016.html

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