使用ida打开发现无法反编译
提示是.net平台,使用ILSpy进行反编译,可以看到算法,由于没有安装vc环境,使用python来改写。
import hashlib def func(A_0, A_1): arr = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113] return arr[A_1] ^ A_0 a1 = "CreateByTenshine" num = 0 A_2 = '' if 0 < len(a1): while num < len(a1): c = a1[num] num2 = 1 while num2 < 15: c = chr(func(ord(c), num2)) num2 += 1 A_2 += c num += 1 A_2 = hashlib.md5(A_2).hexdigest() print "flag{" + A_2.upper() + "}" #flag{967DDDFBCD32C1F53527C221D9E40A0B}