pySim-shell: Authenticate (3g) support
This adds support for AUTHENTICATE to the USIM and ISIM application,
based on the newly-introduced 'construct' encoder/decoder support.
Change-Id: Id5697463e29c3dceff98bcf80f5400f7f2bcaa6c
diff --git a/pySim/commands.py b/pySim/commands.py
index 7919099..791b995 100644
--- a/pySim/commands.py
+++ b/pySim/commands.py
@@ -21,6 +21,8 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
+from construct import *
+from pySim.construct import LV
from pySim.utils import rpad, b2h, sw_match
from pySim.exceptions import SwMatchError
@@ -274,6 +276,26 @@
self.select_path(['3f00', '7f20'])
return self._tp.send_apdu(self.cla_byte + '88000010' + rand)
+ def authenticate(self, rand:str, autn:str, context='3g'):
+ """Execute AUTHENTICATE (USIM/ISIM)."""
+ # 3GPP TS 31.102 Section 7.1.2.1
+ AuthCmd3G = Struct('rand'/LV, 'autn'/Optional(LV))
+ AuthResp3GSyncFail = Struct(Const(b'\xDC'), 'auts'/LV)
+ AuthResp3GSuccess = Struct(Const(b'\xDB'), 'res'/LV, 'ck'/LV, 'ik'/LV, 'kc'/Optional(LV))
+ AuthResp3G = Select(AuthResp3GSyncFail, AuthResp3GSuccess)
+ # build parameters
+ cmd_data = {'rand': rand, 'autn': autn}
+ if context == '3g':
+ p2 = '81'
+ elif context == 'gsm':
+ p2 = '80'
+ (data, sw) = self._tp.send_apdu_constr(self.cla_byte, '88', '00', p2, AuthCmd3G, cmd_data, AuthResp3G)
+ if 'auts' in data:
+ ret = {'synchronisation_failure': data}
+ else:
+ ret = {'successful_3g_authentication': data}
+ return (ret, sw)
+
def reset_card(self):
"""Physically reset the card"""
return self._tp.reset_card()