[CodeEngn.com] Advance RCE Level 13

Mission...
Find the Username when the Password is 042D7650341B4060.
(This problem has multiple answers, so post your answer on the messageboard in a private thread and we will verify it for you.)
Note : "U got the key, you r0x ;)" must pop up for the serial.

(Difficulty : ... | Usefulness : 0/10 [Waste of Time])


Analysis...
Warning! The EXE doesn't work on 64bit Windows.
Why? The main program runs under 64bit assembly but it uses 32bit shell codes for decrypting.
Most of .NET RCE challenges are worthless.

Solution and Coding...
Reverse2L13.cpp
Copyright (C) 2011 3735943886

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Private Access Only...

Results...

Omake...
Attachments are 'C++ dump' and 'KeyGen' of Advance RCE level 13
Please feel free to download and test it.
For testing purpose, you can use following values. (one of working Username and Password)

Username : 003735943886
Password : 485D091B7F64302C

Reverse2L13_dumped.exe

(Compiled with Microsoft SDK)

//
// Reverse2L13_dumped.cpp
// C++ Dump of Advance RCE L13 (CodeEngn.com)
// Made by 3735943886
// License : GPL
//

#include <iostream>
#include <string>

using namespace std;

unsigned __int64 CheckCredential(string MyUserName, __int32 Secret)
{
    // Optimized by 3735943886
    __int32 i;
    unsigned __int64 ReverseSecret;
    unsigned __int64 chArray = 0;
    for(i = 0; i < (int)MyUserName.length(); i++)
    {
        ((char *)&chArray)[i % 4] = (MyUserName[i] + ((char *)&chArray)[i % 4]);
        ((char *)&chArray)[7 - (i % 4)] = ((char *)&chArray)[i % 4];
    }
    for(i = 0; i < 8; i++)
    {
        ((char *)&ReverseSecret)[i] = ((char *)&Secret)[3 - (i % 4)];
    }
    return chArray ^ ReverseSecret;
}

int main()
{
    const __int32 secret = 0xbaadc0de;
    string UserName;
    unsigned __int64 Password;

    cout << endl << "Reverse2L13_dumped.cpp" << endl
        << "C++ Dump of Advance RCE L13 (CodeEngn.com)" << endl
        << "Made by 3735943886" << endl << "License : GPL" << endl << endl;

    cout << "UserName : "; cin >> UserName;
    cout << "Password : "; cin >> hex >> Password;

    if(UserName.length() % 4 == 0)
    {
        if(CheckCredential(UserName, secret) == Password)
        {
            cout << "U got the key, you r0x ;)" << endl;
            return 1;
        }
    }
    cout << "Sorry wr0ng key!!1" << endl;
    return 0;
}

Reverse2L13_keygen.exe

(Compiled with Microsoft SDK)

//
// Reverse2L13_keygen.cpp
// KeyGen of Advance RCE L13 (CodeEngn.com)
// Made by 3735943886
// License : GPL
//

#include <iostream>
#include <string>
#include <iomanip>

using namespace std;

unsigned __int64 CheckCredential(string MyUserName, __int32 Secret)
{
    // Optimized by 3735943886
    __int32 i;
    unsigned __int64 ReverseSecret;
    unsigned __int64 chArray = 0;
    for(i = 0; i < (int)MyUserName.length(); i++)
    {
        ((char *)&chArray)[i % 4] = (MyUserName[i] + ((char *)&chArray)[i % 4]);
        ((char *)&chArray)[7 - (i % 4)] = ((char *)&chArray)[i % 4];
    }
    for(i = 0; i < 8; i++)
    {
        ((char *)&ReverseSecret)[i] = ((char *)&Secret)[3 - (i % 4)];
    }
    return chArray ^ ReverseSecret;
}

int main()
{
    const __int32 secret = 0xbaadc0de;
    string UserName;

    cout << endl << "Reverse2L13_keygen.cpp" << endl
        << "KeyGen of Advance RCE L13 (CodeEngn.com)" << endl
        << "Made by 3735943886" << endl << "License : GPL" << endl << endl;

    cout << "UserName : "; cin >> UserName;

    if(UserName.length() % 4 != 0)
    {
        cout << "Sorry wr0ng key!!1" << endl;
        return 0;
    }
    cout << "Password : " << hex << uppercase << setw(16) << setfill('0') << CheckCredential(UserName, secret) << endl;
    return 1;
}