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anotheruser, posted Sun Jan 13, 2019 5:06 pm (42307)

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need help decrypting png files

Code:

88 50 51 4B 10 0E 21 10 09 08 0B 19 54 54 53 60 11 10 13 80 15 14 17 84 21 1E 1B 1A 1D E2 78 44
.PQK........TTS`........!.....xD

Code:

unsigned __int8 *__cdecl hProtoclEncryptBySeekEvenOdd::decrypt(hProtoclEncryptBySeekEvenOdd *this, hProtocolEncryptInterface *a2, unsigned __int8 *a3, int *a4)
{
  unsigned __int8 *v4; // esi@1
  int v5; // ST08_4@2
  hProtocolEncryptInterface *v6; // ST00_4@3
  int *v8; // [sp Ch] [bp-10h]@0

  sub_6FF51B();
  v4 = (unsigned __int8 *)hProtocolEncryptInterface::getContentByEncryptData(a2, a3, (int)a4, v8);
  if ( v4 )
  {
    hProtoclEncryptBySeekEvenOdd::crypt(this, v4, *((_DWORD *)a2   5), *((_DWORD *)a2   3));
    if ( hProtocolEncryptInterface::getCheckSum(
           (hProtocolEncryptInterface *)v4,
           *((const unsigned __int8 **)a2   5),
           v5) != *((_DWORD *)a2   4) )
    {
      v6 = (hProtocolEncryptInterface *)v4;
      v4 = 0;
      operator delete[]((void *)v6);
    }
  }
  return v4;
}


int __cdecl hProtoclEncryptBySeekEvenOdd::crypt(hProtoclEncryptBySeekEvenOdd *this, unsigned __int8 *a2, int a3, char a4){
  int result;         // eax@1
  unsigned __int8 v5; // dl@5
  int v6; // ecx@5

  result = 0;
  if ( a3 > 0 )  {
    do    {
      while ( 1 )      {
        v5 = ~a2[result];
        a2[result] = v5;
        v6 = *((_DWORD *)this   1);
        if ( v6 != 4 )
          break;
        a2[result] = a4 ^ v5;

LABEL_7:

        if (   result == a3 )
          return result;
      }
      if ( v6 == 2 && result & 1 )      {
        a2[result] = a4 ^ v5;
        goto LABEL_7;
      }
        result;
    }
    while ( result != a3 );
  }
  
  
  
  return result;
}

datkofguy, posted Sun Nov 10, 2019 10:07 pm (52012)

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I'd like to bump this, here are all the files https://mega.nz/#!lp5ywabZ!9WB3UznfH5wp ... pw-kUJJu2A