Any one see this Cryptographic?

[winndy]

Well��thanks all ,firstly.
I met this when I tried to make a keygen of WMV to AVI MPEG DVD WMV Converter 1.4.8.
It's easy to patch.But i want a keygen.
The offical site is:http://www.alloksoft.com.

0041C220    > \6A FF       push -1
0041C222    .  68 191D4300 push WMV_to_A.00431D19                  ;  SE handler installation
0041C227    .  64:A1 00000>mov eax,dword ptr fs:[0]
0041C22D    .  50          push eax
0041C22E    .  64:8925 000>mov dword ptr fs:[0],esp
0041C235    .  81EC 940000>sub esp,94
0041C23B    .  8B8424 A400>mov eax,dword ptr ss:[esp+A4]
0041C242    .  53          push ebx
0041C243    .  56          push esi
0041C244    .  50          push eax
0041C245    .  8D4C24 10   lea ecx,dword ptr ss:[esp+10]
0041C249    .  C74424 60 6>mov dword ptr ss:[esp+60],CD49046B
0041C251    .  C74424 64 C>mov dword ptr ss:[esp+64],829A80CB
0041C259    .  C74424 68 C>mov dword ptr ss:[esp+68],3F5157C0
0041C261    .  C74424 6C 8>mov dword ptr ss:[esp+6C],B50C6384
0041C269    .  C74424 70 5>mov dword ptr ss:[esp+70],AA56D550
0041C271    .  C74424 74 7>mov dword ptr ss:[esp+74],B05ADF71
0041C279    .  C74424 78 D>mov dword ptr ss:[esp+78],7B2E3CD4
0041C281    .  C74424 7C C>mov dword ptr ss:[esp+7C],CFB69AC3
0041C289    .  E8 E8280100 call <jmp.&MFC42.#537>                  ;  kernel32.lstrlenA;MSVCRT.memcpy
0041C28E    .  8B8C24 B000>mov ecx,dword ptr ss:[esp+B0]
0041C295    .  C78424 A400>mov dword ptr ss:[esp+A4],0
0041C2A0    .  51          push ecx
0041C2A1    .  8D4C24 0C   lea ecx,dword ptr ss:[esp+C]
0041C2A5    .  E8 CC280100 call <jmp.&MFC42.#537>
0041C2AA    .  8B5424 0C   mov edx,dword ptr ss:[esp+C]
0041C2AE    .  8B35 BC2544>mov esi,dword ptr ds:[<&MSVCRT._mbscmp>>;  msvcrt._mbscmp
0041C2B4    .  68 60FC4300 push WMV_to_A.0043FC60                  ; /s2 = ""
0041C2B9    .  52          push edx                                ; |s1
0041C2BA    .  C68424 AC00>mov byte ptr ss:[esp+AC],1              ; |
0041C2C2    .  FFD6        call esi                                ; \_mbscmp

if(Decipher(Registrationcode)==username)
Registration successful.

It seems the initial value .
It should be symmetrical cipher .
cipher(username)=Registrationcode