[原创]签到题身在何处 python3 解题脚本-CTF对抗-看雪-安全社区|安全招聘|kanxue.com

[原创]签到题身在何处 python3 解题脚本

发表于: 2021-11-16 12:41 2174

[原创]签到题身在何处 python3 解题脚本

__不说

2021-11-16 12:41

2174

usr = b"KCTF"
usr_len = 4
v16 = [0] * 256
i = 0
for i in range(256):
    v3 = i >> 1
    if ( (i & 1) != 0 ) :
        v3 ^= 0xEDB88320
    if ( (v3 & 1) != 0 ) :
      v4 = (v3 >> 1) ^ 0xEDB88320
    else :
      v4 = v3 >> 1
    if ( (v4 & 1) != 0 ) :
      v5 = (v4 >> 1) ^ 0xEDB88320
    else :
      v5 = v4 >> 1
    if ( (v5 & 1) != 0 ) :
      v6 = (v5 >> 1) ^ 0xEDB88320
    else :
      v6 = v5 >> 1
    if ( (v6 & 1) != 0 ) :
      v7 = (v6 >> 1) ^ 0xEDB88320
    else :
      v7 = v6 >> 1
    if ( (v7 & 1) != 0 ) :
      v8 = (v7 >> 1) ^ 0xEDB88320
    else :
      v8 = v7 >> 1
    if ( (v8 & 1) != 0 ) :
      v9 = (v8 >> 1) ^ 0xEDB88320
    else :
      v9 = v8 >> 1
    if ( (v9 & 1) != 0 ) :
      v10 = (v9 >> 1) ^ 0xEDB88320
    else :
      v10 = v9 >> 1
    v16[i] = v10
 
i = 0
j = -1
while usr_len :
    j = v16[(j ^ usr[i]) & 0xff] ^ (j >> 8 & 0x00ffffff)
    usr_len -= 1
    i += 1
 
print(hex((~j) & 0xffffffff))
 
pwd_str2int = (~j) & 0xffffffff ^ 0x52A1ED5A
 
print(pwd_str2int)