Source code for

# Copyright(C) 2016  Romain Bignon
# This file is part of woob.
# woob is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# woob is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public License
# along with woob. If not, see <>.

import re

_country2length = dict(
    AL=28, AD=24, AT=20, AZ=28, BE=16, BH=22, BA=20, BR=29,
    BG=22, CR=21, HR=21, CY=28, CZ=24, DK=18, DO=28, EE=20,
    FO=18, FI=18, FR=27, GE=22, DE=22, GI=23, GR=27, GL=18,
    GT=28, HU=28, IS=26, IE=22, IL=23, IT=27, KZ=20, KW=30,
    LV=21, LB=28, LI=21, LT=20, LU=20, MK=19, MT=31, MR=27,
    MU=30, MC=27, MD=24, ME=22, NL=18, NO=15, PK=24, PS=29,
    PL=28, PT=25, RO=24, SM=27, SA=24, RS=22, SK=24, SI=19,
    ES=24, SE=24, CH=21, TN=24, TR=26, AE=23, GB=22, VG=24,
    MA=28, JO=30, TL=23, XK=20, QA=29,

[docs]def clean(iban): return iban.replace(' ','').replace('\t', '')
[docs]def is_iban_valid(iban): # Ensure upper alphanumeric input. iban = clean(iban) if not re.match(r'^[A-Z]{2}\d{2}[\dA-Z]+$', iban): return False # Validate country code against expected length. if iban[:2] in _country2length and len(iban) != _country2length[iban[:2]]: return False digits = iban2numeric(iban) return digits % 97 == 1
[docs]def iban2numeric(iban): # Shift and convert. iban = iban[4:] + iban[:4] # BASE 36: 0..9,A..Z -> 0..35 digits = int(''.join(str(int(ch, 36)) for ch in iban)) return digits
[docs]def find_iban_checksum(iban): iban = iban[:2] + '00' + iban[4:] digits = str(iban2numeric(iban)) checksum = 0 for char in digits: checksum *= 10 checksum += int(char) checksum %= 97 return 98-checksum
[docs]def rebuild_iban(iban): return iban[:2] + ('%02d' % find_iban_checksum(iban)) + iban[4:]
[docs]def rib2iban(rib): return rebuild_iban('FR00' + rib)
[docs]def find_rib_checksum(bank, counter, account): letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' digits = '12345678912345678923456789' account = ''.join([(char if char.isdigit() else digits[letters.find(char.upper())]) for char in account]) rest = (89*int(bank) + 15*int(counter) + 3*int(account)) % 97 return 97 - rest
[docs]def is_rib_valid(rib): if len(rib) != 23: return False return find_rib_checksum(rib[:5], rib[5:10], rib[10:21]) == int(rib[21:23])
[docs]def rebuild_rib(rib): rib = clean(rib) assert len(rib) >= 21 key = find_rib_checksum(rib[:5], rib[5:10], rib[10:21]) return rib[:21] + ('%02d' % key)