2010-12-06 23:24:32 +00:00
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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""" pySim: various utilities
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"""
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#
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# Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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def h2b(s):
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return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2])])
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def b2h(s):
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return ''.join(['%02x'%ord(x) for x in s])
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def h2i(s):
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return [(int(x,16)<<4)+int(y,16) for x,y in zip(s[0::2], s[1::2])]
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def i2h(s):
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return ''.join(['%02x'%(x) for x in s])
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2017-07-18 13:48:47 +00:00
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def h2s(s):
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return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2]) if not (x == 'f' and y == 'f') ])
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def s2h(s):
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return b2h(s)
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2010-12-06 23:24:32 +00:00
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def swap_nibbles(s):
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return ''.join([x+y for x,y in zip(s[1::2], s[0::2])])
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def rpad(s, l, c='f'):
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return s + c * (l - len(s))
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def lpad(s, l, c='f'):
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return c * (l - len(s)) + s
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2013-07-04 13:33:33 +00:00
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2013-07-10 07:18:06 +00:00
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def enc_imsi(imsi):
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"""Converts a string imsi into the value of the EF"""
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l = (len(imsi) + 1) // 2 # Required bytes
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oe = len(imsi) & 1 # Odd (1) / Even (0)
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ei = '%02x' % l + swap_nibbles(lpad('%01x%s' % ((oe<<3)|1, imsi), 16))
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return ei
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2013-07-04 13:33:33 +00:00
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def dec_imsi(ef):
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"""Converts an EF value to the imsi string representation"""
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if len(ef) < 4:
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return None
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2017-12-29 19:30:35 +00:00
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l = int(ef[0:2], 16) * 2 # Length of the IMSI string
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2013-07-04 13:33:33 +00:00
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swapped = swap_nibbles(ef[2:])
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oe = (int(swapped[0])>>3) & 1 # Odd (1) / Even (0)
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if oe:
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l = l-1
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if l+1 > len(swapped):
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return None
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imsi = swapped[1:l+2]
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return imsi
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def dec_iccid(ef):
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return swap_nibbles(ef).strip('f')
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2013-07-10 07:18:06 +00:00
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def enc_iccid(iccid):
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return swap_nibbles(rpad(iccid, 20))
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def enc_plmn(mcc, mnc):
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2017-07-18 13:49:59 +00:00
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"""Converts integer MCC/MNC into 3 bytes for EF"""
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2013-07-10 07:18:06 +00:00
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return swap_nibbles(lpad('%d' % mcc, 3) + lpad('%d' % mnc, 3))
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2017-07-18 13:48:47 +00:00
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def dec_spn(ef):
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byte1 = int(ef[0:2])
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hplmn_disp = (byte1&0x01 == 0x01)
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oplmn_disp = (byte1&0x02 == 0x02)
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name = h2s(ef[2:])
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return (name, hplmn_disp, oplmn_disp)
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def enc_spn(name, hplmn_disp=False, oplmn_disp=False):
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byte1 = 0x00
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if hplmn_disp: byte1 = byte1|0x01
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if oplmn_disp: byte1 = byte1|0x02
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return i2h([byte1])+s2h(name)
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