A card usually holds several OTA key sets, and the SCP80 counter is tracked
per key version on the card, so a preset now carries one keyset per
GlobalPlatform key version - the b8..b5 nibble of KIc/KID (TS 102 225
5.1.2/A.2), the version is implicit in the bytes. The spec is explicit:
"a dedicated counter shall be associated to each key version" (Annex A.1) and
"the key version number indicated in the KIc and KID (bits b8..b5) fields
shall be identical when different from 0" - a mismatch is rejected by the card
with "Unidentified security error" (A.2).
Server (presets.py, schema 2):
- a preset carries `keysets: [{kic, kid, kicKey, kidKey, cntr}]`; validation
refuses a KIc/KID version mismatch (A.2), a version outside 01-0F ('00'
means "no security" and is a packet-level choice, not a keyset), duplicate
versions and missing keys/counters; a v3.8.0 flat preset converts into one
keyset on load and on import;
- `set_counter(..., kvn)` writes the counter of that keyset (monotonic per
keyset), the audit line carries the kvn, and `find_keyset()` serves the
lookups;
- the operations derive the key version from the request's KIc byte and
persist into that keyset: /api/send-ota, the RAM install/install-app/compat
steps (_ram_send_gp_apdu) and the test runner's SCP80 steps (which may name
a `kvn` per step and keep one working counter per keyset);
- a non-zero key version the named preset does not define, or a KIc/KID
mismatch, is refused before anything is built (_preset_keyset_check /
_keyset_guard: 400, or a step error in the test runner). Without a
preset_id only the mismatch rule applies.
PWA:
- the Cards form's KIc/KID/counter/keys inputs become a keyset editor (one row
per version: KIc, KID, both keys, that version's counter, Add/Remove; the
version is shown derived from the bytes and a mismatch is flagged);
- the SCP80 and RAM views get a Key-version selector beside the preset
selector, driving the KIc/KID bytes and loading that keyset's keys and
counter; the packet builder refuses a version the preset does not define
(spKeysetCheck/spKeysetGuard, pure and unit-tested);
- the counter syncs are per keyset (spCntrLocalSync/ramSaveCntr), the SCP80
form's counter edit posts the keysets, and the test-run write-back syncs
every counter the server reports (scp80_counters).
Docs/help/AGENTS updated; sw cache simple-v335. Tests: 610 Python (store
keysets, endpoint refusals, the counter landing in the right keyset) and 726
Node (keysets.test.js plus the updated harnesses).
- /api/send-ota no longer 500s on a counter-less body: the plain `sp` path
reports final_cntr only when the counter is usable (_counter_valid, 1-10 hex
digits) - before, the new plain-path report ran int('') and the request died
in the generic handler. The failure path is guarded the same way.
- _decode_por wraps the keyset/SPI construction in the same "never raise" rule
as the decode: a malformed counter or missing keys return None instead of
escaping the handler.
- presets.add() never accepts a taken id (a fresh uuid is assigned, like the
import path), the counter is validated as 1-10 hex digits instead of being
silently masked/kept, and set_counter() ignores a malformed value with a log
line instead of writing it.
- the preset endpoints answer a JSON 500 when the store write fails (read-only
home, disk full) instead of dropping the connection.
- tests: counter-less send-ota, store-write 500, duplicate id, counter
validation (add/update/set_counter), and the temp-file check no longer
matches the audit file; docs/api.md documents final_cntr for the plain path
and preset_id.
The presets lived in the browser's localStorage and the PWA wrote the SCP80
counter back after every operation, so an increment could be lost when the
response never reached the tab, when two browser contexts (or the demo origin
plus a local one) held separate copies, or when the tab was closed mid-run.
The counter is card state and the server performs every card operation, so the
store now lives next to the server:
- pysim_simple_server/presets.py: one JSON file
(~/.pysim-simple-server/card_presets.json, --card-presets overrides; Path.home()
resolves the same way on Windows), atomic writes (temp + fsync + os.replace),
an RLock, stable uuid ids, the ICCID normalisation the PWA uses (digits /
spaced / raw EF hex), a duplicate-ICCID refusal and a monotonic set_counter;
every counter change is appended to card_presets.json.audit.jsonl.
- API: GET /api/presets (card-free), POST /api/presets and
/api/presets/update|delete|import; the import also takes the old localStorage
export shape - that is the migration path, there is no automatic migration.
- Operations name a preset_id and the server persists the counter they
consumed: /api/send-ota (the plain SCP80 path reports final_cntr now too),
the RAM install/install-app/compat steps (_ram_send_gp_apdu) and the test
runner's SCP80 steps (_preset_counter_persist).
- PWA: the Cards tab is a thin client of the store (load on connect, CRUD via
the API, export/import), the counter write-backs became local display syncs
(the SCP80 form's counter input stays a deliberate human edit) and the
SCP80/RAM bodies carry preset_id; a new pysimFetchOk() surfaces the server's
error bodies instead of silently using them.
Policy: card keys in logs and local files are not a risk for this workbench
tool (AGENTS.md) - the store is not encrypted and no redaction is required.
Tests: tests/test_presets.py (store: ICCID forms, counter monotonicity and
wrap, atomic writes, corrupt-file recovery, import), the preset endpoints in
tests/test_fetch_routes.py (incl. the counter persistence via /api/send-ota)
and the updated PWA tests. sw cache simple-v334.
catarrh