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 <56606507+its-just-n...@users.noreply.github.com>
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:
