pyDes 实现 python 版的 DES 加密/解密
jopen
9年前
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 sys reload(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: '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