Login Script help!

[ComputerModding]

This should be quick and simple I hope

I have two servers, on server one I have a VB board with 5,500 + members. On server 2 I have a script I have written myself in PHP for the members to use, so I would like to use the members table on server one for my custom script, that bit is easy and the two servers are already talking to eachother fine.

I have written members scripts before but trying to reverse programme the VB login code is a little over my head, in the past I have just used SHA1, MD5 or a combination of the two for a registration and member login page, but I see from the database that VB uses a password salt.

Can anybody advise on the code used to encrypt a users password using the salt so I can make my custom script encrypt and compare the passwords of my VB? this will save my members alot of time having to re-register an account just to use the script ( I have googled this over the past few days and so far not found anything concreat that I can use)

Thanks in advance

Kevin