analyze the code to calculate key

004010B4 XOR EBX,EBX

004010B6 XOR ESI,ESI

004010B8 CMP DWORD PTR DS:[402173],13

004010BF JL SHORT ReverseM.004010F7

004010C1 MOV AL,BYTE PTR DS:[EBX+40211A]

004010C7 CMP AL,0

004010C9 JE SHORT ReverseM.004010D3

004010CB CMP AL,46

004010CD JNZ SHORT ReverseM.004010D0

004010CF INC ESI

004010D0 INC EBX

004010D1 JMP SHORT ReverseM.004010C1

004010D3 CMP ESI,7

004010D6 JL SHORT ReverseM.004010F7

004010D8 JMP ReverseM.00401205