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Manual Reference Pages  -  ALGORITHM::CHECKDIGITS::MXX_001 (3)

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NAME

CheckDigits::MXX_001 - compute check digits for german Personalausweis (pa_de) or ABA routing numbers (aba_rn)

CONTENTS

SYNOPSIS



  use Algorithm::CheckDigits;

  $pa = CheckDigits(pa_de);

  if ($pa->is_valid(2406055684D<<6810203<0705109<6)) {
        # do something
  }

  if ($pa->is_valid(2406055684) {
        # do_something
  }

  $cn = $pa->complete(240605568_D<<681020_<070510_<_);
  # $cn = 2406055684D<<6810203<0705109<6

  $cd = $pa->checkdigit(2406055684D<<6810203<0705109<6);
  # $cd = 6

  $bn = $pa->basenumber(2406055684D<<6810203<0705109<6);
  # $bn = 240605568_D<<681020_<070510_<_

  $aba = CheckDigits(aba_rn);
  if ($aba->is_valid(789456124)) {
       # do something
  }



DESCRIPTION

    ALGORITHM

1. Beginning left all digits are weighted with 7,3,1,7,3,1,... for pa_de or 3,7,1,3,7,1,3,7,1 for aba_rn.
2. The sum of those products is computed.
3. For pa_de the checksum is the last digit of the sum from step 2 (modulo 10).

For aba_rn the checksum is the difference of the sum from step 2 to the next multiple of 10.

4. For the german Personalausweis step 1 to 3 is performed for every part of the number and for all 3 parts including the particular checkdigit to compute the total checksum.

If the number solely consists of digits, the checksum is just computed once according to algorithm given above.

    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, <mamawe@cpan.org>

THANKS

Aaron W. West pointed me to a fault in the computing of the check digit. Jim Hickstein made me aware of the ABA routing numbers.

SEE ALSO

perl, CheckDigits, www.pruefziffernberechnung.de, http://answers.google.com/answers/threadview/id/43619.html, http://www.brainjar.com/js/validation/
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perl v5.20.3 ALGORITHM::CHECKDIGITS::MXX_001 (3) 2016-03-17

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