Help: Analyse PUT KEY apdu?

Question

Hi all,
I have an PUT KEY apdu like this:
1) 80 D8 00 81 43 03 80 10 50 D2 82 EF C4 24 0A EB BD 85 AD E1 F7 71 ED A2 03 8B AF 47 80 10 50 D2 82 EF C4 24 0A EB BD 85 AD E1 F7 71 ED A2 03 8B AF 47 80 10 50 D2 82 EF C4 24 0A EB BD 85 AD E1 F7 71 ED A2 03 8B AF 47
or
2) 80 D8 01 00 16 CD E5 F1 B9 49 F1 1F A7 6B BF 0E 91 32 23 C2 E6 00
And in GP 2.1.1 specification, coding of PUT KEY apdu like this:
CLA   '80' or '84'
INS   'D8'                  PUT KEY
P1    'xx'                   Reference control parameter P1
P2    'xx'                   Reference control parameter P2
Lc    'xx'                   Length of data field+*
_Data 'xxxx..'              Key data (and MAC if present)_
Le    '00'
And data field structure like this:
_1byte Key type_
_1byte Length of key or key component_
Variable: 1-n            Key or key component data value
_1byte Length of key check value_
Variable: 0-n            Key check value (if present)
I can't analyse above apdu(s) follow that format.
Please explain for me!
Thanks,
HoaND
Edited by: hoaibaotre on Oct 19, 2011 9:00 AM
Edited by: hoaibaotre on Oct 19, 2011 9:13 AM

Answer 1

Hi hoaibaotre,
It's obvious that the specification of Data Field lies in your post
1) 80 D8 00 81 43 03 80 10 50 D2 82 EF C4 24 0A EB BD 85 AD E1 F7 71 ED A2 03 8B AF 47 80 10 50 D2 82 EF C4 24 0A EB BD 85 AD E1 F7 71 ED A2 03 8B AF 47 80 10 50 D2 82 EF C4 24 0A EB BD 85 AD E1 F7 71 ED A2 03 8B AF 47
or
2) 80 D8 01 00 16 CD E5 F1 B9 49 F1 1F A7 6B BF 0E 91 32 23 C2 E6 00
This is the format
1-1byte Key type
2-1byte Length of key or key component
3-Variable: 1-n Key or key component data value
4-1byte Length of key check value
5-Variable: 0-n Key check value (if present)
Look into your first PUT KEY APDU command
1- 0x80
2- 0x10
3- 0x50 0xD2 0x82 0xEF 0xC4 0x24 0x0A 0xEB 0xBD 0x85 0xAD 0xE1 0xF7 0x71 0xED 0xA2, in this case n = 16 (0x10)
4- 0x03
5- 0x8B 0xAF 0x47, in this case n = 3. n = 0 if MAC is not present (so the 4th equals to 0x00)
The 2nd key and 3rd key are explained in the same way.
For the second PUT KEY APDU command, it seems to me that it's a command to put a single key of 16 bytes
Hope that this would shed some light on the PUT KEY command.
Best regards,
JDL
P.S. it seems to me that you are Vietnamese, working for Viettel? a mobile operator in Vietnam and are you working for the smartcard center (Viettel Global, situated in the Duy Tan str. in Hanoi, behind the TienPhong Bank building?).