SHA1 handshake pass

[John Schellingerhout]

Hello,

I'm not sure I placed this in the right section, but my question is if someone could explain how the handshake authentication works.
As I get from MySQL internals, it should be SHA1 pass and I tried it, but get acces denied for user 'user'@ip back.
I did a lot of googling, but somehow I didn's found that much information about it, until this morning someone explained to do sha1(pass) XOR SHA1(20 bytes server greeting hash + sha1(sha1(pass))
But this didn't work either.
Then I found a mysql 4/5 hash calculator and surprising, it shows the result of sha1(sha1(pass)) and not that of the salt + sha1(sha1(hash)), but unfortunality it doesn't work either.

So, what routine/algoritm do I have to use to authentica in the answer on servers greeting (handshake)?

We're trying to log data into mysql from an simple embedded solution, so we haven;t te ability to use connectors or so.
Hopefully someone wants to explain it?

P.S. SHA1 routine works, I checked SHA1 and SHA1(SHA1()) and both has the right hash result.
So somehow MySQL doenst;t or recognize the pass correctly or I'm sending the wrong sha1 hash?

Is it correct MySQL returns my local IP after the user in stead of its own IP?

Thanks a lot,

Regards John