JavaCard OS

Posted: **Wed May 04, 2016 2:28 am**

I have read the section "PUT KEY command" in GlobalPlatform Card Specification 2.1.1
It defines the structure of this APDU command

<!-- ia1 -->PUT KEY COMMAND.png<!-- ia1 -->

Data field structure

<!-- ia0 -->Data structure.png<!-- ia0 -->

But now I have a PUT KEY command:

Code: Select all

80 D8 01 00 16 CD E5 F1 B9 49 F1 1F A7 6B BF 0E 91 32 23 C2 E6 00

And I couldn't analyse this APDU following the above data field format.

Hope someone can help me understand this command well.
Thanks

I can now understand this PUT KEY command either.

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 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

Posted: **Wed May 04, 2016 3:46 am**

For the first command, it seems that it's a command to put a single key of 16 bytes.

Posted: **Wed May 04, 2016 3:57 am**

For the second 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.

Posted: **Wed May 04, 2016 4:18 am**

Dear mabel,

I got it!

But could you please explain what is Key Check value field?

Thanks!

Posted: **Wed May 04, 2016 5:45 am**

wousim wrote: But could you please explain what is Key Check value field?

You can think that Key Check Value is a way to verify the key when it enters into the system.

JavaCard OS

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