Keygenning Checksum based algos

Hi,
Can someone help me with that one. I also found another algo which I can't reverse. It is
00401380 . BE E0324000 MOV ESI,KEYGENME.004032E0 ; Key1 (DWORD)
00401385 . BF 0B334000 MOV EDI,KEYGENME.0040330B ; Key2 (DWORD)
0040138A . B9 09000000 MOV ECX,9
0040138F > 0FBE0433 MOVSX EAX,BYTE PTR DS:[EBX+ESI]
00401393 . 0FC1C1 XADD ECX,EAX
00401396 . 03CB ADD ECX,EBX
00401398 . 66:0FACC2 04 SHRD DX,AX,4
0040139D . FEC2 INC DL
0040139F . 32D6 XOR DL,DH
004013A1 . 88143B MOV BYTE PTR DS:[EBX+EDI],DL
004013A4 . 43 INC EBX
004013A5 . 83FB 04 CMP EBX,4
004013A8 .^ 75 E5 JNZ SHORT KEYGENME.0040138F

I have Key2. I want to get key1. How do I do it?

BTW, I had made a post earlier but it didn't appear .Maybe the old man deleted it cuz I didn't have 15 posts then.

Thomas Antony