[Bluez-users] Transfer link key from/to windows

[Bluez-users] Transfer link key from/to windows

[Attila Zsigmond]

Hello,

I have a dual boot PC and I want to connect it to my mobile phone via 
bluetooth. Currently I need enter the pin code each time if I boot the 
other operating system. I know where the link key is in my linux and 
could export link key from windows registry. But I cannot replace them 
each other because they have different length. On linux key is 16 bytes 
length while on windows it is 128. Can bluez be configured to create 
longer link keys? Any other idea?

Attila


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Re: [Bluez-users] Transfer link key from/to windows

[Marcel Holtmann]

Hi Attila,

> I have a dual boot PC and I want to connect it to my mobile phone via 
> bluetooth. Currently I need enter the pin code each time if I boot the 
> other operating system. I know where the link key is in my linux and 
> could export link key from windows registry. But I cannot replace them 
> each other because they have different length. On linux key is 16 bytes 
> length while on windows it is 128. Can bluez be configured to create 
> longer link keys? Any other idea?

the link key is always 16 bytes / 128 bits long. Even Windows can't
change this.

Regards

Marcel




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Re: [Bluez-users] Transfer link key from/to windows

[Fred Schaettgen]

[-- Attachment #1: Type: text/plain, Size: 1571 bytes --]

On Friday, 29. April 2005 18:58, Attila Zsigmond wrote:
> Hello,
>
> I have a dual boot PC and I want to connect it to my mobile phone via
> bluetooth. Currently I need enter the pin code each time if I boot the
> other operating system. I know where the link key is in my linux and
> could export link key from windows registry. But I cannot replace them
> each other because they have different length. On linux key is 16 bytes
> length while on windows it is 128. Can bluez be configured to create
> longer link keys? Any other idea?

Maybe you can use the attached script as a starting point, which I just 
rescued from the deepest depths of my harddisk. It's supposed to transfer 
link keys from Linux to Windows.

It's highly unlikely that it works as is, and I didn't touch it since quite a 
while since I don't have a windows installation atm. At least one problem I 
remember was that the acl of some registry key had to be changed manually 
before applying the inf-file, because not even an admin can change (or even 
see?) it by default. I'm quite sure that it's possible to change this with 
some inf-file magic, but I didn't feel motivated enough to investiagte 
further and finally abandoned the whole thing in an unknown state.

All I can promise is that it generates some sort of inf file from the 
link_keys file which you can apply under windows. I even can't remember if it 
ever worked. It's for the XP stack, not for Widcomm btw. Maybe you or someone 
else is motivated enough to make this work. 

Fred

-- 
Fred Schaettgen
bluez-devel@schaettgen.de

[-- Attachment #2: bt_export_linkkeys --]
[-- Type: application/x-python, Size: 2644 bytes --]

Re: [Bluez-users] Transfer link key from/to windows

[Attila Zsigmond]

>the link key is always 16 bytes / 128 bits long. Even Windows can"t
> change this.
> 
> Regards
> 
> Marcel

Hmmm... Thank you, Marcel. I know that this list is not about MS windows 
but maybe somebody can help. Here is the link key exported from XP 
registry:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Widcomm\BTConfig\Devices\08:00:1f:51:d1:e9]
"Name"=hex:57,69,6c,64,72,6f,73,65,00
"DevClass"=hex:50,02,04
"Features"=hex:ef,ff,0b,00,00,00,00,00
"TimeStamp"=dword:0000329d
"FTPAuthorizationExpires"=hex:00
"OPPAuthorizationExpires"=hex:00
"TrustedMask"=dword:00000000
"LinkKey"=hex:80,00,00,00,4c,00,00,00,01,02,00,00,02,66,00,00,00,a4,00,00,84,
\
  e1,7a,fe,7f,da,a6,51,87,b1,b7,1e,19,cc,cd,ea,fe,f7,b5,88,57,33,15,27,91,f8,
\
  c9,db,74,00,59,64,ff,9f,8b,3c,a0,fb,01,ba,52,7c,f3,28,94,b1,54,52,a4,30,42,
\
  6a,90,9f,55,40,a8,62,af,5c,60,7e,1f,92,28,00,00,00,15,86,a6,99,9b,53,e6,6c,
\
  a3,8e,06,77,c5,4d,3e,9a,17,70,8d,6b,06,40,19,88,fb,6b,d6,9f,8f,ef,77,3d,23,
\
  0f,99,cc,c7,d0,1d,cb

[HKEY_LOCAL_MACHINE\SOFTWARE\Widcomm\BTConfig\Devices\08:00:1f:51:d1:e9\0]
"ServiceNameUTF8"=hex:53,65,72,69,61,6c,20,50,6f,72,74,00
"ServiceNameNative"=hex:53,65,72,69,61,6c,20,50,6f,72,74,00
"UUID"=dword:00001101
"Security"=dword:00000000
"DefaultConnection"=dword:00000000

How can it be 16 bytes long? How can it be decoded or which part should 
I use?

Attila



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Re: [Bluez-users] Transfer link key from/to windows

[Fred Schaettgen]

On Friday, 29. April 2005 23:07, Attila Zsigmond wrote:
...
> Hmmm... Thank you, Marcel. I know that this list is not about MS windows
> but maybe somebody can help. Here is the link key exported from XP
> registry:
>
> Windows Registry Editor Version 5.00
>
> [HKEY_LOCAL_MACHINE\SOFTWARE\Widcomm\BTConfig\Devices\08:00:1f:51:d1:e9]
> "Name"=hex:57,69,6c,64,72,6f,73,65,00
> "DevClass"=hex:50,02,04
> "Features"=hex:ef,ff,0b,00,00,00,00,00
> "TimeStamp"=dword:0000329d
> "FTPAuthorizationExpires"=hex:00
> "OPPAuthorizationExpires"=hex:00
> "TrustedMask"=dword:00000000
> "LinkKey"=hex:80,00,00,00,4c,00,00,00,01,02,00,00,02,66,00,00,00,a4,00,00,84
> e1,7a,fe,7f,da,a6,51,87,b1,b7,1e,19,cc,cd,ea,fe,f7,b5,88,57,33,15,27,91,f8,
> c9,db,74,00,59,64,ff,9f,8b,3c,a0,fb,01,ba,52,7c,f3,28,94,b1,54,52,a4,30,42,
> 6a,90,9f,55,40,a8,62,af,5c,60,7e,1f,92,28,00,00,00,15,86,a6,99,9b,53,e6,6c,
> a3,8e,06,77,c5,4d,3e,9a,17,70,8d,6b,06,40,19,88,fb,6b,d6,9f,8f,ef,77,3d,23,
>  0f,99,cc,c7,d0,1d,cb
...
> How can it be 16 bytes long? How can it be decoded or which part should
> I use?

I guess the "LinkKey" registry key contains simply a little bit more than just 
the link key itself. If you have both a windows and a linux system you might 
try pairing the windows box with the linux system. Then have a look at the 
link_keys file with a hex editor to find matching parts. The beginning of the 
"LinkKey" doesn't look very linkkey-like.
Is 08:00:1f:51:d1:e9 the adaptor's adress or is it the address of the peer 
device? In any case, where is the other address stored? Or does the Widcomm 
stack support only a single adaptor?

Fred

-- 
Fred Schaettgen
bluez-devel@schaettgen.de


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