INSTALL for install system specific parameters

Question

Hi,
I use a third party tool to download and install an applet on my card. The last INSTALL command looks like this:
80 E6 04 00 45 10 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX 10 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX 10 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX 01 00 0E C9 00 EF 0A CA 08 01 FF FF 00 10 01 00 00 00 00
The bytes in bold are the system specific parameters: tag (EF), length (0A) and value.
Is there a description of these system specific parameters and what they mean or this depends on the card issuer and is therefore known only to the card issuer?
Thanks

Answer 1

The tag itself says that.
The BER-TLV encoding is described in ISO7816-4_2005 page 14.
The EF value reads as follows in binary: 1110 1111. (b8-b1)
The decoding is as follows:
b8-b7 = 11 means private class, not defined in ISO7816-4
b6 = 1 means constructed encoding
b5-b1 not all set to 1 means tag number 01111=15
b6 = 1 means the contents of this tag is constructed, ie, it contains a concatenation of tags.
next byte, 0A = 10 bytes of contents
next byte = CA, due to the constructed encoding, this is a tag
in binary, this reads 1100 1001
and, b8-b7=11 = private class
b6 = 0 = primitive encoding, the tag contains raw data and not a set of russian dolls
b5-b1 not all set to one means tag number 9.
To sum it up, all tags with b6 = 1 are constructed:
That means that the following tag ranges are constructed:
001XXXXX = [0x20 - 0x3F]
011XXXXX = [0x60 - 0x7F]
101XXXXX = [0xA0 - 0xBF]
111XXXXX = [0xE0 - 0xFF]
And the following ranges are primitive:
000XXXXX = [0x00 - 0x1F]
010XXXXX= [0x40 - 0x5F]
100XXXXX= [0x80 - 0x9F]
110XXXXX= [0xC0 - 0xDF]
regards :)