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saip.PES.rebuild_mandatory_services(): set 5G get-identity, profile-a-x25519, profile-b-p256

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Related: SYS#8096 SYS#8037
Change-Id: Ibc29c6437c5c92e2b14938b733156536863465c1
This commit is contained in:
Neels Hofmeyr
2026-06-13 01:24:52 +02:00
parent ccc9b5a7b2
commit 60239571d6
1 changed files with 50 additions and 2 deletions
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pySim/esim/saip/__init__.py
+50 -2
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@@ -34,7 +34,7 @@ from pySim import ts_102_222
from pySim.utils import dec_imsi
from pySim.ts_102_221 import FileDescriptor
from pySim.filesystem import CardADF, Path
from pySim.ts_31_102 import ADF_USIM
from pySim.ts_31_102 import ADF_USIM, EF_UST, EF_SUCI_Calc_Info
from pySim.ts_31_103 import ADF_ISIM
from pySim.esim import compile_asn1_subdir
from pySim.esim.saip import templates
@@ -1729,7 +1729,55 @@ class ProfileElementSequence:
if 'BT' in ftype_list:
svc_set.add('ber-tlv')
# FIXME:dfLinked files (scan all files, check for non-empty Fcp.linkPath presence of DFs)
# TODO: 5G related bits (derive from EF.UST or file presence?)
# 5G:
# - When SUCI is:
# - enabled (EF.UST 124 = true)
# AND
# - calculated in the USIM (EF.UST 125 = true),
# then eUICC-Mandatory-services needs 'get-identity'.
# - 'get-identity' implies that the eUICC must support ONE OF profile-A OR profile-B.
# So, when SUCI-CalcInfo for USIM in DF.SAIP contains both key types,
# then no profile-A or B services need to be requested explicitly.
# - When the SUCI-CalcInfo for USIM (DF.SAIP) contains ONLY a key of profile-A ("identifier": 1),
# then eUICC-Mandatory-services needs 'profile-a-x25519'.
# - Same: ONLY profile-B ("identifier": 2) needs 'profile-b-p256'.
# - (When SUCI is calculated in the UE, then the eUICC does not need to provide any of these services.)
suci_in_usim_enabled = False
try:
f_ust = self.get_pe_for_type("usim").files["ef-ust"]
ust = EF_UST().decode_bin(f_ust.body)
suci_in_usim_enabled = ust[124]['activated'] and ust[125]['activated']
except (KeyError, AttributeError):
pass
if suci_in_usim_enabled:
svc_set.add('get-identity')
# now check for profile-a and profile-b
suci_calcinfo_has_profile_a = False
suci_calcinfo_has_profile_b = False
try:
f_sucici = self.get_pe_for_type("df-saip").files["ef-suci-calc-info-usim"]
sucici = EF_SUCI_Calc_Info().decode_bin(f_sucici.body) or {}
for prot_scheme in sucici['prot_scheme_id_list']:
if not isinstance(prot_scheme, dict):
continue
ps_id = prot_scheme["identifier"]
if ps_id == 1:
suci_calcinfo_has_profile_a = True
elif ps_id == 2:
suci_calcinfo_has_profile_b = True
except (KeyError, AttributeError):
pass
if suci_calcinfo_has_profile_a and suci_calcinfo_has_profile_b:
# 'get-identity' implies that the eUICC supports one of the above. Do not require a specific one.
pass
elif suci_calcinfo_has_profile_a:
# The profile has only a profile-A key, so require that
svc_set.add('profile-a-x25519')
elif suci_calcinfo_has_profile_b:
# The profile has only a profile-B key, so require that
svc_set.add('profile-b-p256')
hdr_pe = self.get_pe_for_type('header')
# patch in the 'manual' services from the existing list:
for old_svc in hdr_pe.decoded['eUICC-Mandatory-services'].keys():