def _step1_verhoeff_5digits(self, number, nit, date_invoice, amount_total):
# dummy verhoeff numbers
data = (number, nit, date_invoice, amount_total)
# append two verhoeff numbers to each param
sum1 = sum([int(str(d) + verhoeff.encode(d, 2)) for d in data])
# generate 5 verhoeff digits
return verhoeff.encode(sum1, 5)
def generate(self, number, amount_total_company_signed, **kwargs):
"""Changing values are bill & amount
the others can be persisten through
the instance (date_invoice, nit).
Persistence values can be overrided by
keyword argument"""
# round amount upper if >= .5
amount_total_company_signed = int(round(amount_total_company_signed))
# nit
if kwargs.has_key('nit'):
nit = self.set_nit(kwargs['nit']).get_nit()
else:
nit = self.get_nit()
# date
if kwargs.has_key('date_invoice'):
date_invoice = self.set_date(kwargs['date_invoice']).get_date()
else:
date_invoice = self.get_date()
# validate parameters
if not self.validate_bill(number):
raise InvalidParam('Invalid bill %s' % number)
if not self.validate_amount(amount_total_company_signed):
raise InvalidParam('Invalid amount %s' %
amount_total_company_signed)
if not self.validate_nit(nit):
raise InvalidParam('Invalid nit %s' % nit)
if not self.validate_date(date_invoice):
raise InvalidParam('Invalid date %s' % date_invoice)
##
## Start process
##
## get persistent parameters
auth = self.get_auth()
secret = self.get_secret()
debug('Begining process')
##
## step 1
##
verhoeff5 = self._step1_verhoeff_5digits(number, nit, date_invoice,
amount_total_company_signed)
debug('Verhoeff 5 Digits: ' + repr(verhoeff5), 1)
##
## step2
##
strings = self._step2_slice_secret_by_verhoeff(verhoeff5)
debug('String Slices: ' + repr(strings), 1)
## concatenate
long_string = ''
for s1, s2 in zip(
(auth, number, nit, date_invoice, amount_total_company_signed),
strings):
## add two verhoeff digits to each param
## but auth
if s1 != auth:
s1 = str(s1) + verhoeff.encode(s1, 2)
## concatenate string
long_string += str(s1) + str(s2)
debug('Long String: ' + repr(long_string), 2)
##
## step3
##
long_string_rc4 = self._step3_encode_allegedrc4(verhoeff5, long_string)
debug('ARC4 Long String: ' + repr(long_string_rc4), 1)
##
## step4
##
partial_sums = self._step4_partial_sums(long_string_rc4)
debug('Partial Sums: ' + repr(partial_sums), 2)
debug('Total Sum: ' + str(sum(partial_sums)), 2)
##
## step5
##
base64_string = self._step5_base64_sum(verhoeff5, partial_sums)
debug('Base64 String: ' + base64_string, 1)
##
## step6
##
code = self._step6_get_code(verhoeff5, base64_string)
debug('Raw Code: ' + code, 1)
##
## Return print-ready code
##
return self._format_code(code)