Provided by: libbusiness-br-ids-perl_0.0022-3_all 
NAME
Business::BR::CNPJ - Perl module to test for correct CNPJ numbers
SYNOPSIS
use Business::BR::CNPJ;
print "ok " if test_cnpj('90.117.749/7654-80'); # prints 'ok '
print "bad " unless test_cnpj('88.222.111/0001-10'); # prints 'bad '
DESCRIPTION
The CNPJ number is an identification number of Brazilian companies emitted by the Brazilian Ministry of
Revenue, which is called "Ministério da Fazenda".
CNPJ stands for "Cadastro Nacional de Pessoa Jurídica" (literally, national juridical person
registration) as opposed to the CPF number for natural persons. Sometime ago, it was called CGC
("Cadastro Geral de Contribuinte" or general taxpayer registration).
The CNPJ is comprised of a base of 8 digits, a 4-digits radical and 2 check digits. It is usually written
like '11.111.111/0001-55' so as to be more human-readable.
This module provides "test_cnpj" for checking that a CNPJ number is correct. Here a correct CNPJ number
means
• it is 14 digits long
• it satisfies the two check equations mentioned below
Before checking, any non-digit letter is stripped, making it easy to test formatted entries like
'11.111.111/0001-55' and entries with extra blanks like ' 43.337.004 / 0001-72 '.
test_cnpj
test_cnpj('48.999.764/0001-60') # incorrect CPF, returns 0
test_cnpj(' 43.337.004/0001-72 ') # is ok, returns 1
test_cnpj('888') # nope, returns undef
Tests whether a CNPJ number is correct. Before testing, any non-digit character is stripped. Then it
is expected to be 14 digits long and to satisfy two check equations which validate the last two check
digits. See "THE CHECK EQUATIONS".
The policy to get rid of '.', '/' and '-' is very liberal. It indeeds discards anything that is not
a digit (0, 1, ..., 9) or letter. That is handy for discarding spaces as well.
test_cnpj(' 66.818.021/0001-27 ') # is ok, returns 1
But extraneous inputs like 'a53##045%4-20**0001!50' are also accepted. If you are worried about this
kind of input, just check against a regex:
warn "bad CNPJ: only digits (14) expected"
unless ($cnpj =~ /^\d{14}$/);
warn "bad CNPJ: does not match mask '__.___.___/____-__'"
unless ($cnpj =~ /^\d{2}\.\d{3}\.\d{3}/\d{4}-\d{2}$/);
NOTE. Integer numbers like 3337004000158 (or 3_337_004_0001_58) with fewer than 14 digits will be
normalized (eg. to 03_337_004_0001_58) before testing.
canon_cnpj
canon_cnpj(1); # returns '00000000000001'
canon_cnpj('99.999.222/0001-12'); # returns '99999222000112'
Canon's a candidate for a CNPJ number. In case, the argument is an integer, it is formatted to at
least fourteen digits. Otherwise, it is stripped of any non-alphanumeric characters and returned as
it is.
format_cnpj
format_cnpj('00 000 000 0000 00'); # returns '00.000.000/0000-00'
Formats its input into '00.000.000/0000-00' mask. First, the argument is canon'ed and then dots,
slash and hyphen are added to the first 14 digits of the result.
parse_cnpj
($base, $filial, $dv) = parse_cnpj($cpf);
$hashref = parse_cnpj('11.222.333/4444-00'); # { base => '11222333', filial => '4444' dv => '00' }
Splits a candidate for CNPJ number into base, radical and check digits (dv - dígitos de verificação).
It canon's the argument before splitting it into 8-, 4- and 2-digits parts. In a list context,
returns a three-element list with the base, the radical and the check digits. In a scalar context,
returns a hash ref with keys 'base', 'filial' and 'dv' and associated values.
random_cnpj
$rand_cnpj = random_cnpj($valid);
$good_cnpj = random_cnpj();
$cnpj = random_cnpj(1); # also a good one
$bad_cnpj = random_cnpj(0); # bad CNPJ
Generates a random CNPJ. If $valid is omitted or 1, it is guaranteed to be correct. If $valid is 0,
it is guaranteed to be incorrect. This function is intented for mass test. (Use it wisely.)
The implementation is: generate a 8-digits random number for the base, and the variation is chosen
95% of the time to be '0001' and the other 5% a skewed random distribution with the expression
"int(sqr rand(1E8))" is used. A uniform distribution is expected from "rand". With the base and
variation, the check digits are computed. If $valid==0, the check digits are computed not to satisfy
the check equations.
EXPORT
"test_cnpj" is exported by default. "canon_cnpj", "format_cnpj", "parse_cnpj" and "random_cnpj" can be
exported on demand.
THE CHECK EQUATIONS
A correct CNPJ number has two check digits which are computed from the 12 first digits. Consider the CNPJ
number written as 14 digits
c[1] c[2] c[3] c[4] c[5] c[6] c[7] c[8] c[9] c[10] c[11] c[12] dv[1] dv[2]
To check whether a CNPJ is correct or not, it has to satisfy the check equations:
5*c[1]+4*c[2]+3*c[3]+2*c[4]+9*c[5]+
8*c[6]+7*c[7]+6*c[8]+5*c[9]+4*c[10]+
3*c[11]+2*c[12]+dv[1] = 0 (mod 11) or
= 1 (mod 11) (if dv[1]=0)
and
6*c[1]+5*c[2]+4*c[3]+3*c[4]+2*c[5]+
9*c[6]+8*c[7]+7*c[8]+6*c[9]+5*c[10]+
4*c[11]+3*c[12]+2*dv[1]+dv[2] = 0 (mod 11) or
= 1 (mod 11) (if dv[2]=0)
BUGS
I heard that there are exceptions of CNPJ numbers which don't obey the check equations and are still
authentic. I have never found one of them.
SEE ALSO
To make sure this module works, one can try the results obtained against those found with "Emissão de
Comprovante de Inscrição e de Situação Cadastral de Pessoa Jurídica", a web page which the Brazilian
Ministry of Revenue provides for public consultation on regularity status of the taxpayer. This page
tells if the CNPJ number is a correct entry (14-digits-long with verified check digits), if it references
a real company and if it is regular with the government body.
Given a bad CNPJ, the after-submit page tells "O número do CNPJ não é válido" (the CNPJ number is not
valid). If the CNPJ is a good one but does not reference a real company, it says "CNPJ não existe em
nossa base de dados" (CNPJ does not exist in our database). Otherwise, it shows a details form for the
identified taxpayer.
Note that this module only tests correctness. It doesn't enter the merit whether the CNPJ number
actually exists at the Brazilian government databases.
As you might have guessed, this is not the first Perl module to approach this kind of functionality. Take
a look at
http://search.cpan.org/search?module=Brasil::Checar::CGC
Please reports bugs via CPAN RT, http://rt.cpan.org/NoAuth/Bugs.html?Dist=Business-BR-Ids By doing so,
the author will receive your reports and patches, as well as the problem and solutions will be
documented.
AUTHOR
A. R. Ferreira, <ferreira@cpan.org>
COPYRIGHT AND LICENSE
Copyright (C) 2005 by A. R. Ferreira
This library is free software; you can redistribute it and/or modify it under the same terms as Perl
itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have available.
POD ERRORS
Hey! The above document had some coding errors, which are explained below:
Around line 112:
Non-ASCII character seen before =encoding in '"Ministério'. Assuming CP1252
perl v5.36.0 2022-10-13 Business::BR::CNPJ(3pm)