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commands: better exception string for authentication failures 

At the moment we use the send_apdu_checksw() method to send the APDU for
ADM authentication. This method only checks if the command returns with
sw = 9000. If not it raises an exception that the sw is not as expected.
The user may think that this is a problem with thr reader, pcscd or
pySim in the first place and may try multiple times until the card is
permanently locked. A better execption string that also displays the
tries which are left may be helpful.

Change-Id: Icf428831094f8c1045eefaa8cb2b92e6a36b0c13
Related: OS#4963
This commit is contained in:
Philipp Maier 2021-03-11 13:46:32 +01:00 committed by laforge
parent 3aec871978
commit a31e9a9a68
1 changed files with 4 additions and 1 deletions
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5
pySim/commands.py
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@ -205,4 +205,7 @@ class SimCardCommands(object):
def verify_chv(self, chv_no, code):
fc = rpad(b2h(code), 16)
return self._tp.send_apdu_checksw(self.cla_byte + '2000' + ('%02X' % chv_no) + '08' + fc)
data, sw = self._tp.send_apdu(self.cla_byte + '2000' + ('%02X' % chv_no) + '08' + fc)
if (sw != '9000'):
raise RuntimeError('Failed to authenticate with ADM key %s, %i tries left.' % (code, int(sw[3])))
return (data,sw)