Reading class component

Hi,
I am trying to interpret Class component and i got a stragne hex value in the file: you can see the complete content as below:
06 01 5A 00 0A 03 44 40 03 33 30 06 68 20 A2 A3 80 00 81 02 81 00 0A 69 6E 74 65 72 66 61 63 65 32 A4 00 0C 80 00 81 02 81 00 0A 69 6E 74 65 72 66 61 63 65 31 00 82 03 00 FF 00 07 01 00 00 00 1E 25 83 00 00 FF 00 01 05 00 00 00 46 00 4A 00 4E 00 52 00 56 00 1E 05 01 02 04 03 05 00 0C 04 02 04 03 05 80 00 00 81 02 03 04 03 05 81 00 03 04 03 05 05 3E E9 00 00 01 E2 75 00 03 02 99 F8 00 06 04 05 46 00 06 03 0C 84 00 06 05 00 06 43 6C 61 73 73 41 02 00 1E 00 0C 25 00 3E 01 FF 00 02 0A 00 06 00 B1 00 4E 00 52 00 56 00 61 00 64 00 67 00 6A 00 6D 00 70 00 8B 00 8E 00 91 00 94 00 97 00 9A 00 1E 05 01 02 04 03 05 00 0C 04 02 04 03 05 80 00 00 81 02 03 04 03 05 81 00 03 04 03 05 05 3E E9 00 00 01 E2 75 00 03 02 99 F8 00 06 04 05 46 00 06 03 0C 84 00 06 05 00 09 4C 69 62 72 61 72 69 65 73 02 00 1E 00 0C 25 00 97 01 FF 00 0C 01 06 00 00 BC 00 1E 05 01 02 04 03 05 00 0C 04 02 04 03 05 80 00 00 81 02 03 04 03 05 81 00 03 04 03 05 05 3E E9 00 00 01 E2 75 00 03 02 99 F8 00 06 04 05 46 00 06 03 0C 84 00 06 05 00 06 43 6C 61 73 73 42 02 00 1E 00 0C
so:
06 - tag
01 5A - size
00 0A - signature pool length
03 44 40 - first sig item - correct, since the nibble counti is 3, and last nibble is 0x0
03 33 30 - second sig item - correct as above
06 68 20 A2 - third item - correct
next is the forth item:
A3 *80 00 81 02 81 00 0A 69 6E 74*
*65 72 66 61 63 65 32 A4 00 0C*
*80 00 81 02 81 00 0A 69 6E 74*
*65 72 66 61 63 65 31 00 82 03*
*00 FF 00 07 01 00 00 00 1E 25*
*83 00 00 FF 00 01 05 00 00 00*
*46 00 4A 00 4E 00 52 00 56 00*
*1E 05 01 02 04 03 05 00 0C 04*
*02 04*
as you see, the nibble count is odd (A3 => 163), hence the last nibble in the array should be 0x0, but it is 0x4 -> something wrong
secondly, the first nibble in the array is 0x8, which is not a valid value of nibble, since in nibble value table (table 24 in JCVM spec), there is no 0x8 value.
Could you help me to find out what wrong here?
thanks,
Hoang Long
Edited by: user5138836 on Jun 12, 2011 8:53 PM
Edited by: user5138836 on Jun 12, 2011 8:54 PM
Edited by: user5138836 on Jun 12, 2011 8:55 PM

Hi Shane,
do you see something wrong int the fourth item of signature pool array that i separate it out of other elements?
its first byte is A3 (HEX) = 163 (DEC) which is nibble count value. Therefore, according to the spec, if nibble count is odd then the last item in nibble array must be 0x0. However this concept is not respected in this example.
Can you spend some time to clarify this situation?
thanks,
Hoang Long
Edited by: user5138836 on Jun 14, 2011 6:42 PM

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I have been trying to make sense of the CAP file structure using this Hello World example: Java Card &#8220;Hello World&#8221; Applet | Java Card
The class component of its CAP file is given as:
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Hi Shane,
do you see something wrong int the fourth item of signature pool array that i separate it out of other elements?
its first byte is A3 (HEX) = 163 (DEC) which is nibble count value. Therefore, according to the spec, if nibble count is odd then the last item in nibble array must be 0x0. However this concept is not respected in this example.
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Edited by: user5138836 on Jun 14, 2011 6:42 PM

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