Biff8 standard encryption(office 97/2000 defalut encryption way)

[helpme]

Hi,does anybody knows the decrypt steps of Biff8 standard encryption?
the following is example of biff2-biff7 XOR Stream Encryption to explain
what i am
asking:
1) get the password from the user
2) create hash value (16-bit,) and encryption key (16-bit) from the password
3) store hash value and encryption key in FILEPASS record
4) create the 128-bit sized key sequence from password and encryption key
5)encrypt all following records using the key sequence

I get this information from the
http://sc.openoffice.org/excelfileformat.pdf, but it doesn't provide
something like this for Biff8 standard encyption, also ,it would be better if
somebody tells me
the more details of the steps,such as how encryption key and hash value are
produced from the password entered from the user.