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July 16, 2016 12:14
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hack you 2014 – Crypto200 – hashme (at katagaitai CTF勉強会 #5 - 関東|med)
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import socket | |
from math import sin | |
def xor(a, b): | |
return ''.join(map(lambda x : chr(ord(x[0]) ^ ord(x[1])), zip(a, b * 100))) | |
def hashme_ext(s, digest, len_seed): | |
#my secure hash function | |
def F(X,Y,Z): | |
return ((~X & Z) | (~X & Z)) & 0xFFFFFFFF | |
def G(X,Y,Z): | |
return ((X & Z) | (~Z & Y)) & 0xFFFFFFFF | |
def H(X,Y,Z): | |
return (X ^ Y ^ Y) & 0xFFFFFFFF | |
def I(X,Y,Z): | |
return (Y ^ (~Z | X)) & 0xFFFFFFFF | |
def ROL(X,Y): | |
return (X << Y | X >> (32 - Y)) & 0xFFFFFFFF | |
#A = 0x67452301 | |
#B = 0xEFCDAB89 | |
#C = 0x98BADCFE | |
#D = 0x10325476 | |
B = int(digest[:8], 16) | |
A = int(digest[8:16], 16) | |
D = int(digest[16:24], 16) | |
C = int(digest[24:], 16) | |
X = [int(0xFFFFFFFF * sin(i)) & 0xFFFFFFFF for i in xrange(256)] | |
for i,ch in enumerate(s): | |
#k, l = ord(ch), i & 0x1f | |
k, l = ord(ch), (len_seed + i) & 0x1f | |
A = (B + ROL(A + F(B,C,D) + X[k], l)) & 0xFFFFFFFF | |
B = (C + ROL(B + G(C,D,A) + X[k], l)) & 0xFFFFFFFF | |
C = (D + ROL(C + H(D,A,B) + X[k], l)) & 0xFFFFFFFF | |
D = (A + ROL(D + I(A,B,C) + X[k], l)) & 0xFFFFFFFF | |
return ''.join(map(lambda x : hex(x)[2:].strip('L').rjust(8, '0'), [B, A, D, C])) | |
s = socket.create_connection(('katagaitai.orz.hm', 7777)) | |
data = s.recv(8192) | |
print data | |
data = s.recv(8192) | |
print data | |
""" | |
login = 'A' * 200 | |
s.sendall('0\n') | |
data = s.recv(8192) | |
print data | |
s.sendall(login + '\n') | |
data = s.recv(8192) | |
print data | |
ss = "login=%s&role=anonymous" % login | |
cert = 'RK5yZMJaRRl8LVBk5mx9xmVfPhXWqPlNObWPakmd6mpMs0qh6p9KVhBr0hqGJCE9tKRpgFRM7SZFGXwtUGTmbH3GZV8+Fdao+U05tY9qSZ3qakyzSqHqn0pWEGvSGoYkIT20pGmAVEztJkUZfC1QZOZsfcZlXz4V1qj5TTm1j2pJnepqTLNKoeqfSlYQa9IahiQhPbSkaYBUTO0mRRl8LVBk5mx9xmVfPhXWqPlNObWPakmd6mpMs0qh6p9KVhBr0hqGJCE9tKRpgFRM7SYiKlIAdBjGQ1PpXXMQIeSI2z5JzKgSP+rJHzzBOtmT7movZBrwY6EEV0XN1k70dg==' | |
key = xor(ss, cert.decode('base64')) | |
print key.encode('hex') | |
""" | |
login = 'A' * 200 | |
cert = 'RK5yZMJaRRl8LVBk5mx9xmVfPhXWqPlNObWPakmd6mpMs0qh6p9KVhBr0hqGJCE9tKRpgFRM7SZFGXwtUGTmbH3GZV8+Fdao+U05tY9qSZ3qakyzSqHqn0pWEGvSGoYkIT20pGmAVEztJkUZfC1QZOZsfcZlXz4V1qj5TTm1j2pJnepqTLNKoeqfSlYQa9IahiQhPbSkaYBUTO0mRRl8LVBk5mx9xmVfPhXWqPlNObWPakmd6mpMs0qh6p9KVhBr0hqGJCE9tKRpgFRM7SYiKlIAdBjGQ1PpXXMQIeSI2z5JzKgSP+rJHzzBOtmT7movZBrwY6EEV0XN1k70dg==' | |
key = '28c1150dac6704583d6c1125a72d3c87241e7f5497e9b80c78f4ce2b08dcab2b0df20be0abde0b17512a935bc765607cf5e528c1150dac6704583d6c1125a72d3c87241e7f5497e9b80c78f4ce2b08dcab2b0df20be0abde0b17512a935bc765607cf5e5'.decode('hex') | |
def verify(s, cert): | |
s.sendall('1\n') | |
print s.recv(8192) | |
s.sendall(cert+'\n') | |
data = s.recv(8192) | |
print data | |
if 'Auth failed' not in data: | |
print s.recv(8192) | |
return True | |
print s.recv(8192) | |
digest = xor(cert.decode('base64'), key)[-32:] | |
for len_seed in xrange(32): | |
digest_ext = hashme_ext('&role=administrator', digest, len_seed) | |
ss = "login=%s&role=anonymous&role=administrator" % login | |
cert = xor(ss + digest_ext, key).encode('base64').replace('\n', '') | |
print "[+] len_seed = %d" % len_seed | |
if verify(s, cert): | |
break |
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$ python hashme_solve.py | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 0 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 1 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 2 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 3 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 4 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 5 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 6 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 7 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 8 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 9 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 10 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 11 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 12 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 13 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 14 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 15 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 16 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 17 | |
Provide your certificate: | |
[-] Auth failed | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
[+] len_seed = 18 | |
Provide your certificate: | |
[+] Welcome, AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA! | |
FLAG{2016_is_5th_aniversary_of_katagaitai} ☆(ゝω・)v | |
====================== | |
[0] Register | |
[1] Login | |
====================== | |
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