NAME

CheckDigits::M11_004 - compute check digits for CPF (BR), Título Eleitoral (BR)

SYNOPSIS

  use Algorithm::CheckDigits;

  $cpf = CheckDigits('cpf');

  if ($cpf->is_valid('043.033.407-90')) {
        # do something
  }

  $cn = $cpf->complete('043.033.407-');
  # $cn = '043.033.407-90'

  $cd = $cpf->checkdigit('043.033.407-90');
  # $cd = '90'

  $bn = $cpf->basenumber('043.033.407-90');
  # $bn = '043.033.407-'

DESCRIPTION

ALGORITHM

1. From left to right all digits are multiplied with their position in the sequence.
2. The sum of all products is computed.
3. The sum of step 2 is taken modulo 11.

   a) If the result is 0 or 1 the checkdigit is 0

   b) otherwise the checkdigit is 11 minus the result.

4. The first checkdigit is appended to the number and step 1 to 3 are repeated.

METHODS

is_valid($number)

Returns true only if $number consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.

Returns false otherwise,

complete($number)

The check digit for $number is computed and concatenated to the end of $number.

Returns the complete number with check digit or '' if $number does not consist solely of digits and spaces.

basenumber($number)

Returns the basenumber of $number if $number has a valid check digit.

Return '' otherwise.

checkdigit($number)

Returns the checkdigit of $number if $number has a valid check digit.

Return '' otherwise.

EXPORT

None by default.

AUTHOR

Mathias Weidner, <mathias@weidner.in-bad-schmiedeberg.de>

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de.