我每个题的代码都很垃圾，取指令长度用的X86IL.h（forgot很看不起这个）
很简单的特征字节搜索解码函数，如果搜不到就是0分了
des和标准的相比，我看到的情况是只有两个盒子变了
我先是通过代码对比des的区别，因为实现原理有差异，结果跟的晕头，失败告终，
最后把应用密码学的书拿出来，用书上标准流程和程序里的代码对比，最后找到了区别
变换后的两个box：
static int pc_1_c[28]=
{
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 52, 60, 44, 36
};
static int pc_1_d[28]=
{
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 37, 45, 29,
21, 13, 28, 5, 20, 12, 4
};
/*原始的两个box
static int pc_1_c[28]=
{
57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36
};
static int pc_1_d[28]=
{
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4
};
*/
上面说的不准确，那其实是一个box被拆成了两半，另一个修改的box是：
static int pc_2[48]=
{
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 13, 20, 2,
41, 52, 31, 37, 47, 55,
30, 40, 45, 33, 51, 48,
44, 49, 56, 39, 34, 53,
46, 42, 50, 36, 29, 32
};
/*原始box
static int pc_2[48]=
{
14, 17, 11, 24, 1, 5,
3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8,
16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55,
30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53,
46, 42, 50, 36, 29, 32
};
*/
[课程]Android-CTF解题方法汇总！
