catarrh/simtrace-analyser
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Decode KIc/KID algorithms unconditionally; expand packet-length labels

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catarrh committed 2026-08-17 21:40:12 +03:00
1 parent f6ce7dfe3e
commit 166cf4ed0f
2 files changed
+16 -7
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frontend/index.html
+2 -2
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@@ -664,7 +664,7 @@ function cmdRows(cmd) {
const sec = t.secured;
if (sec && !sec.raw) {
rows.push(['Secured packet', 'CPL ' + sec.cpl + ' · CHL ' + sec.chl]);
rows.push(['Secured packet', 'Command Packet Length ' + sec.cpl + ' · Command Header Length ' + sec.chl]);
const s = sec.spi || {};
rows.push(['SPI', '0x' + (s.hex || '') + ' — ' + (s.counter || '') +
(s.ciphering ? ', ciphering' : '') + ', ' + (s.rc_cc_ds || '') + ', ' + (s.por || '')]);
@@ -679,7 +679,7 @@ function cmdRows(cmd) {
const rp = t.response_packet;
if (rp && !rp.raw) {
rows.push(['Response packet', 'RPL ' + rp.rpl + ' · RHL ' + rp.rhl]);
rows.push(['Response packet', 'Response Packet Length ' + rp.rpl + ' · Response Header Length ' + rp.rhl]);
rows.push(['TAR', '0x' + rp.tar]);
rows.push(['CNTR', '0x' + rp.cntr]);
rows.push(['PCNTR', rp.pcntr]);
simtrace2_pysniff/server/decode.py
+14 -5
View File
@@ -1727,7 +1727,7 @@ _OTA_POR = {0: 'no PoR', 1: 'PoR required', 2: 'PoR only on error'}
# TS 102 225 §5.1.2 / §5.1.3 — KIc / KID algorithms (low nibble)
_KIC_ALGO = {0: 'implicit', 1: 'DES', 2: 'AES-CBC', 5: '3DES-CBC (2 keys)', 9: '3DES-CBC (3 keys)'}
_KID_CC_ALGO = {0: 'implicit', 1: 'DES', 5: '3DES-CBC', 2: 'AES-CMAC'}
_KID_CC_ALGO = {0: 'implicit', 1: 'DES', 5: '3DES-CBC (2 keys)', 9: '3DES-CBC (3 keys)', 2: 'AES-CMAC'}
_KID_RC_ALGO = {0: 'implicit', 1: 'CRC16', 5: 'CRC32', 3: 'proprietary'}
# TS 102 225 §5.2 Table 5 + TS 31.115 §7 — Response status codes
@@ -1798,12 +1798,21 @@ def _decode_secured_packet(body):
'pcntr': pcntr,
'data': data.hex().upper(),
}
kic_algo = _KIC_ALGO.get(kic & 0x0F, 'reserved')
if not (spi1 & 0x08): # SPI says no ciphering → KIc unused
kic_algo += ' (unused)'
result['kic'] = {'key': kic >> 4, 'algo': kic_algo}
if rc_cc_ds_kind == 2: # CC
result['kid'] = {'key': kid >> 4, 'algo': _KID_CC_ALGO.get(kid & 0x0F, 'reserved')}
kid_algo = _KID_CC_ALGO.get(kid & 0x0F, 'reserved')
elif rc_cc_ds_kind == 1: # RC
result['kid'] = {'key': kid >> 4, 'algo': _KID_RC_ALGO.get(kid & 0x0F, 'reserved')}
else:
result['kid'] = {'key': kid >> 4, 'algo': 'implicit'}
kid_algo = _KID_RC_ALGO.get(kid & 0x0F, 'reserved')
elif rc_cc_ds_kind == 3: # DS — no simple nibble table
kid_algo = 'DS'
else: # none — decode the nibble anyway (CC interpretation)
kid_algo = _KID_CC_ALGO.get(kid & 0x0F, 'reserved')
if rc_cc_ds_kind == 0:
kid_algo += ' (unused)'
result['kid'] = {'key': kid >> 4, 'algo': kid_algo}
if rc_cc_ds:
result['rc_cc_ds'] = rc_cc_ds.hex().upper()
return result