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annotate doc/GrcardSIM2-WEKI-file @ 68:c5e7c9e1d857

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GSM7 to qstring decoding: rework in a new way, emit \E for Euro
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 25 Mar 2021 00:04:08 +0000
parents da6e9d0b2ee6
children 526193acfb3f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 GrcardSIM2 cards have a proprietary EF under DF_GSM with file ID 0x0001;
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2 Osmocom wiki page for this card model gives EF.WEKI as the name for this
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3 proprietary file. We (FreeCalypso) have no idea as to where this name came
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4 from, and where and how the people who wrote that wiki page (Sysmocom staff or
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5 not - unknown) got this knowledge. This file is important because it stores Ki
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6 and the selection of COMP128 algorithm version, but the same file also appears
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7 to have other fields serving other purposes which are not currently understood.
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8
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9 The total length of this transparent EF is 35 bytes, out of which only the first
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10 19 bytes are documented in the Osmocom wiki page and written by their pySim-prog
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11 tool. Let us now break down this file according to our currently available
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12 limited understanding:
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13
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14 * The first two bytes are always 00 10 - these byte values appear in "blank"
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15 unprogrammed cards as shipped by Grcard, they also appear in the Osmocom wiki
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16 page, and are programmed by pySim-prog. The purpose and meaning of these two
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17 bytes are completely unknown, and we have never tried writing anything
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18 different into them.
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19
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20 * The next byte gives COMP128 algorithm selection plus something else that is
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21 not understood:
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22
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23 - The low 2 bits of this byte select COMP128 algorithm version as follows:
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24
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25 0b00 = COMP128v1
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26 0b01 = COMP128v2
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27 0b10 = COMP128v3
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28
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29 Note that the Osmocom wiki page is wrong in its description of these bits:
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30 setting these two bits to 0b11 ends up selecting COMP128v2 rather than v3.
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31 (pySim-prog is unaffected because it always writes 00 into the whole byte,
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32 selecting COMP128v1.)
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33
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34 - The remaining 6 bits of this byte are not understood. Osmocom wiki page
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35 tells people to write zeros into the upper 6 bits and so does pySim-prog,
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36 but the "blank" unprogrammed cards we got from Grcard have this byte set to
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37 0x20. Setting the upper nibble to either 0 or 2 does not seem to affect
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38 the result of RUN GSM ALGORITHM operations, thus it probably controls
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39 something else.
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40
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41 * The next 16 bytes store Ki - this part is straightforward.
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42
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43 * The last 16 bytes are not understood; our "blank" unprogrammed cards from
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44 Grcard have all FFs in these bytes.
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45
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46 fc-simtool support for programming Ki and COMP128 algorithm selection
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47 =====================================================================
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48
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49 Even if we never learn the function of the other mysterious fields of EF.WEKI,
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50 we must be able to program our own Ki and make our own selection of COMP128
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51 algorithm version in order to use these programmable SIM cards with our own GSM
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52 networks. The following solution has been implemented for immediate use:
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53
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54 * Our grcard2-set-comp128 command takes a single argument of 1, 2 or 3,
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55 selecting COMP128 algorithm version. The implementation of this command
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56 selects EF.WEKI, reads the previous content of the magic byte at offset 2,
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57 keeps the upper 6 bits unchanged, and writes the new COMP128 algorithm
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58 selection into the low 2 bits. If we ever learn the meaning of other bits,
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59 we'll be able to add new orthogonal commands that manipulate those other bits,
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60 but leave COMP128 selection unchanged.
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61
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62 * Our grcard2-set-ki command writes 16 bytes at offset 3, leaving all other
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63 bytes untouched.