Yubico Forum

Re: Yubikey public ID (and sticker)

2009-11-20T19:52:11+01:00

OK, so I figured this out, here is the python code. What I was missing was the byte order.

--
>>> otp = 'ccccccccfckduehjhceenjluteviurncvivulgecfjbj'
>>> id = otp[:-32]
>>> id = yubikey.modhex_decode(id)
>>> id
'\x00\x00\x00\x00@\x92'
>>> struct.unpack('(0, 0, 37440)
>>> struct.unpack('>HHH', id)
(0, 0, 16530)
# eureka, there is my id as an integer!
# now pad that guy with NULL word to expand it to 64 bits, then convert to long long.
>>> struct.unpack('>Q', struct.pack('H', 0) + id)
(16530,)
--

Statistics: Posted by btimby — Fri Nov 20, 2009 7:52 pm

Re: Yubikey public ID (and sticker)

2009-11-20T17:11:08+01:00

Thank you. However, I need to do this programatically. I have found examples on how to encode/decode modhex, but how do I go from the result to the int?

Statistics: Posted by btimby — Fri Nov 20, 2009 5:11 pm

Re: Yubikey public ID (and sticker)

2009-11-20T07:46:23+01:00

Yubico provides the ModHex calculator for converting the data into various formats including converting the integer into the ModHex format. The ModHex calculator is available at the following link:

http://www.yubico.com/developers/modhex/

We hope this helps!

Statistics: Posted by network-marvels — Fri Nov 20, 2009 7:46 am

Yubikey public ID (and sticker)

2009-11-19T17:12:20+01:00

My understanding is that the number printed on the sticker stuck to the plastic envelope is the public ID assigned to the yubikey.

I need to know how to translate from this integer value to the modhex version the yubikey spits out.

For example, I ask a customer to read the number from the sticker, I want to locate that key in my database, how is this conversion from integer to 48 bit modhex value performed?

I can find no example of this.

Statistics: Posted by btimby — Thu Nov 19, 2009 5:12 pm