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~

String strKey = "test_KEY",strParam = "test__IV" String desEncrypt(String source) (source == || source.length() == 0 = Cipher.getInstance("DES/CBC/PKCS5Padding"= DESKeySpec(strKey.getBytes("UTF-8"= SecretKeyFactory.getInstance("DES"== IvParameterSpec(strParam.getBytes("UTF-8""UTF-8"</span><span style="color: #0000ff;"&gt;public</span> <span style="color: #0000ff;"&gt;static</span> String desDecrypt(String source) <span style="color: #0000ff;"&gt;throws</span><span style="color: #000000;"&gt; Exception {
</span><span style="color: #0000ff;"&gt;if</span> (source == <span style="color: #0000ff;"&gt;null</span> || source.length() == 0<span style="color: #000000;"&gt;)
</span><span style="color: #0000ff;"&gt;return</span> <span style="color: #0000ff;"&gt;null</span><span style="color: #000000;"&gt;;
</span><span style="color: #0000ff;"&gt;byte</span>[] src =<span style="color: #000000;"&gt; StringHelper.fromHexString(source);
Cipher cipher </span>= Cipher.getInstance("DES/CBC/PKCS5Padding"<span style="color: #000000;"&gt;);
DESKeySpec desKeySpec </span>= <span style="color: #0000ff;"&gt;new</span> DESKeySpec(strKey.getBytes("UTF-8"<span style="color: #000000;"&gt;));
SecretKeyFactory keyFactory </span>= SecretKeyFactory.getInstance("DES"<span style="color: #000000;"&gt;);
SecretKey secretKey </span>=<span style="color: #000000;"&gt; keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv </span>= <span style="color: #0000ff;"&gt;new</span> IvParameterSpec(strParam.getBytes("UTF-8"<span style="color: #000000;"&gt;));
cipher.init(Cipher.DECRYPT_MODE,iv);
</span><span style="color: #0000ff;"&gt;byte</span>[] retByte =<span style="color: #000000;"&gt; cipher.doFinal(src);
</span><span style="color: #0000ff;"&gt;return</span> <span style="color: #0000ff;"&gt;new</span><span style="color: #000000;"&gt; String(retByte);
}

</span><span style="color: #0000ff;"&gt;public</span> <span style="color: #0000ff;"&gt;static</span> <span style="color: #0000ff;"&gt;void</span> main(String[] args) <span style="color: #0000ff;"&gt;throws</span><span style="color: #000000;"&gt; Exception {
System.out
.println(EncryptHelper
.desDecrypt(</span>"886f930f65f29132f6ace2683c448b5580d681a1fec3fc91cf3161f074b53b935d1c8fe80f99201077b36f923a42ac0e05cabe579308fda08d8ff463ad334677"<span style="color: #000000;"&gt;));
System.out.println(EncryptHelper.desEncrypt(</span>"https://mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361"<span style="color: #000000;"&gt;));
}

}

<span style="color: #008000;">//<span style="color: #008000;">结果：
<span style="color: #008000;">//<span style="color: #008000; text-decoration: underline;">https://mail.google.com/mail/u/0/<span style="color: #008000;">#inbox/a1ed0e2f6f28e06b4361
<span style="color: #008000;">//<span style="color: #008000;">886F930F65F29132F6ACE2683C448B5580D681A1FEC3FC91CF3161F074B53B935D1C8FE80F99201077B36F923A42AC0E05CABE579308FDA08D8FF463AD334677

2、Python 版

# -*- coding:utf-8 -*-
reload(sys)
sys.setdefaultencoding('utf-8'<span style="color: #000000;">)
from pyDes <span style="color: #0000ff;">import *<span style="color: #000000;">
from binascii <span style="color: #0000ff;">import<span style="color: #000000;"> b2a_hex,a2b_hex

For Python3,you'll need to use bytes,i.e.:

data = b"Please encrypt my data"<span style="color: #000000;">

k = des(b"DESCRYPT",CBC,b"\0\0\0\0\0\0\0\0",pad=None,padmode=<span style="color: #000000;">PAD_PKCS5)

data = 'https://mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361'<span style="color: #000000;">
KEY = "test_KEY"<span style="color: #000000;"> #密钥
IV = "test__IV"<span style="color: #000000;"> #偏转向量

使用DES对称加密算法的CBC模式加密

k = des(KEY,IV,padmode=<span style="color: #000000;">PAD_PKCS5)
d =<span style="color: #000000;"> k.encrypt(data)
print b2a_hex(d)
print "Decrypted: %r" %<span style="color: #000000;"> k.decrypt(d)

结果：

886f930f65f29132f6ace2683c448b5580d681a1fec3fc91cf3161f074b53b935d1c8fe80f99201077b36f923a42ac0e05cabe579308fda08d8ff463ad334677

Decrypted: '

<span style="color: #000000;">

或者单行命令如下：

python -c 'from pyDes import *;from binascii import a2b_hex;import sys;print des("test_KEY","test__IV",padmode=PAD_PKCS5).decrypt(a2b_hex(sys.stdin.readlines()[0].strip()))' <<<<span style="color: #000000;">886f930f65f29132f6ace2683c448b5580d681a1fec3fc91cf3161f074b53b935d1c8fe80f99201077b36f923a42ac0e05cabe579308fda08d8ff463ad334677

https:<span style="color: #008000;">//<span style="color: #008000;">mail.google.com/mail/u/0/#inbox/a1ed0e2f6f28e06b4361

<h1 id="h1_2">3、Refer

[1]pyDes库 实现python的des加密

[2]Cryptography and Python

[3]加密解密工具类 EncryptUtil

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

[5]python 对字符串的加密解密

[6]数据加密算法

[7]非对称加密算法

[8]Pycrypto与RSA密码技术笔记