攻防世界 reverse 进阶 15-Reversing-x64Elf-100

Posted 2022-09-24 dirwang

15.Reversing-x64Elf-100

这题非常简单，

 1 signed __int64 __fastcall sub_4006FD(__int64 a1)
 2 
 3   signed int i; // [rsp+14h] [rbp-24h]
 4   const char *v3; // [rsp+18h] [rbp-20h]
 5   const char *v4; // [rsp+20h] [rbp-18h]
 6   const char *v5; // [rsp+28h] [rbp-10h]
 7 
 8   v3 = "Dufhbmf";
 9   v4 = "pG`imos";
10   v5 = "ewUglpt";
11   for ( i = 0; i <= 11; ++i )
12   
13     if ( (&v3)[i % 3][2 * (i / 3)] - *(char *)(i + a1) != 1 )
14       return 1LL;
15   
16   return 0LL;
17 

 

wp：

 1 v3 = "Dufhbmf";
 2 v4 = "pG`imos";
 3 v5 = "ewUglpt";
 4 v3=v3+v4+v5
 5 x=‘‘
 6 for i in range(12):
 7   t=v3[(i%3)*7+(2*int(i/3))]
 8   x+=chr(ord(t)-1)
 9 
10 print(x)

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