虾米音乐链接crack（Python版）

17 Feb 2014

大约一年前发现了虾米歌曲的链接转换算法（其实n年前已经有了），文章：http://lazynight.me/2916.html

最近要用python实现一个cli版的虾米电台，再一次遇到这个问题，手写了一个，遂有此文。

凯撒阵列算法：

#encoding:utf-8

import urllib

def caesar(location):

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num = int(location[0])

avg_len, remainder = int(len(location[1:]) / num), int(len(location[1:]) % num)

result = [location[i * (avg_len + 1) + 1: (i + 1) * (avg_len + 1) + 1] for i in range(remainder)]

result.extend([location[(avg_len + 1) * remainder:][i * avg_len + 1: (i + 1) * avg_len + 1] for i in range(num-remainder)])

url = urllib.unquote(”.join([''.join([result[j][i] for j in range(num)]) for i in range(avg_len)]) +

”.join([result[r][-1] for r in range(remainder)])).replace(‘^’,’0′)

return url

Github传送门：

【提示】

解密之后的链接貌似不可用了，可能是检查referer，后续解决。