Hello, Here is a patch for handling malformed IMSI If you misswrited your IMSI, it will be impossible to read or edit it again :( This patch fix that Thanks Goodbye

From 76e18254499aff27dea07c93e14eb7f74426240f Mon Sep 17 00:00:00 2001 From: n4n5 &lt;56606507+Its-Just-Nans(a)users.noreply.github.com&gt; Date: Wed, 28 Feb 2024 14:57:33 +0100 Subject: [PATCH] add try-except for handling malformed imsi --- pySim/utils.py | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/pySim/utils.py b/pySim/utils.py index afa476b..c758ed0 100644 --- a/pySim/utils.py +++ b/pySim/utils.py @@ -422,21 +422,25 @@ def enc_imsi(imsi: str): def dec_imsi(ef: Hexstr) -> Optional[str]: """Converts an EF value to the IMSI string representation""" - if len(ef) < 4: - return None - l = int(ef[0:2], 16) * 2 # Length of the IMSI string - l = l - 1 # Encoded length byte includes oe nibble - swapped = swap_nibbles(ef[2:]).rstrip('f') - if len(swapped) < 1: - return None - oe = (int(swapped[0]) >> 3) & 1 # Odd (1) / Even (0) - if not oe: - # if even, only half of last byte was used - l = l-1 - if l != len(swapped) - 1: + try: + if len(ef) < 4: + return None + l = int(ef[0:2], 16) * 2 # Length of the IMSI string + l = l - 1 # Encoded length byte includes oe nibble + swapped = swap_nibbles(ef[2:]).rstrip('f') + if len(swapped) < 1: + return None + oe = (int(swapped[0]) >> 3) & 1 # Odd (1) / Even (0) + if not oe: + # if even, only half of last byte was used + l = l-1 + if l != len(swapped) - 1: + return None + imsi = swapped[1:] + return imsi + except ValueError as err: + # print("IMSI is present but malformed") return None - imsi = swapped[1:] - return imsi def dec_iccid(ef: Hexstr) -> str: