| #!/usr/bin/env python |
| # -*- coding: utf-8 -*- |
| |
| """ pySim: various utilities |
| """ |
| |
| # |
| # Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com> |
| # |
| # This program is free software: you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation, either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| # |
| |
| |
| def h2b(s): |
| return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2])]) |
| |
| def b2h(s): |
| return ''.join(['%02x'%ord(x) for x in s]) |
| |
| def h2i(s): |
| return [(int(x,16)<<4)+int(y,16) for x,y in zip(s[0::2], s[1::2])] |
| |
| def i2h(s): |
| return ''.join(['%02x'%(x) for x in s]) |
| |
| def swap_nibbles(s): |
| return ''.join([x+y for x,y in zip(s[1::2], s[0::2])]) |
| |
| def rpad(s, l, c='f'): |
| return s + c * (l - len(s)) |
| |
| def lpad(s, l, c='f'): |
| return c * (l - len(s)) + s |
| |
| def enc_imsi(imsi): |
| """Converts a string imsi into the value of the EF""" |
| l = (len(imsi) + 1) // 2 # Required bytes |
| oe = len(imsi) & 1 # Odd (1) / Even (0) |
| ei = '%02x' % l + swap_nibbles(lpad('%01x%s' % ((oe<<3)|1, imsi), 16)) |
| return ei |
| |
| def dec_imsi(ef): |
| """Converts an EF value to the imsi string representation""" |
| if len(ef) < 4: |
| return None |
| l = int(ef[0:2]) * 2 # Length of the IMSI string |
| swapped = swap_nibbles(ef[2:]) |
| oe = (int(swapped[0])>>3) & 1 # Odd (1) / Even (0) |
| if oe: |
| l = l-1 |
| if l+1 > len(swapped): |
| return None |
| imsi = swapped[1:l+2] |
| return imsi |
| |
| def dec_iccid(ef): |
| return swap_nibbles(ef).strip('f') |
| |
| def enc_iccid(iccid): |
| return swap_nibbles(rpad(iccid, 20)) |
| |
| def enc_plmn(mcc, mnc): |
| """Converts integer MCC/MNC into 6 bytes for EF""" |
| return swap_nibbles(lpad('%d' % mcc, 3) + lpad('%d' % mnc, 3)) |