---
name: "Algorithm::CheckDigits::M11_012"
section: "3pm"
platform: "linux"
package: "libalgorithm-checkdigits-perl"
version: "1.3.6-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Algorithm::CheckDigits::M11_012"
---

# Algorithm::CheckDigits::M11\_012(3pm)

compute check digits for Bundeswehrpersonenkennnummer (DE)

## NAME

CheckDigits::M11\_012 - compute check digits for Bundeswehrpersonenkennnummer (DE)

## SYNOPSIS

```
  use Algorithm::CheckDigits;
  $bwpk = CheckDigits('bwpk_de');
  if ($bwpk->is_valid('151058-D-20711')) {
        # do something
  }
  $cn = $bwpk->complete('151058-D-2071');
  # $cn = '151058-D-20711'
  $cd = $bwpk->checkdigit('151058-D-20711');
  # $cd = '1'
  $bn = $bwpk->basenumber('151058-D-20711');
  # $bn = '151058-D-2071';
```

## DESCRIPTION

### ALGORITHM

- 1\.

  Beginning left all digits are weighted 2,3,4,5,6,7,1,6,7,2,3. Letters are replaced according to the following table:

  ```
    my %table_to = (
          A => 12, B => 14, C => 16, D => 18, E => 20,
          F => 22, G => 24, H => 26, I => 28, J => 6,
          K => 8, L => 10, M => 12, N => 14, O => 16,
          P => 18, Q => 20, R => 22, S => 4, T => 6,
          U => 8, V => 10, W => 12, X => 14, Y => 16,
          Z => 18,
    );
  ```

- 2\.

  The weighted digits are added.

- 3\.

  The sum from step 2 is taken modulo 11.

- 4\.

  The checksum is 11 minus the sum from step 3.

  If the difference is 10, the checkdigit is 0.

  If the difference is 11, the checkdigit is 1.

### METHODS

- is\_valid($number)

  Returns true only if `$number` consists solely of numbers, letters and hyphens and the rightmost digit is a valid check digit according to the algorithm given above.

  Returns false otherwise,

- complete($number)

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

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

- basenumber($number)

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

  Return '' otherwise.

- checkdigit($number)

  Returns the check digits of `$number` if `$number` has valid check digits.

  Return '' otherwise.

### EXPORT

None by default.

## AUTHOR

Mathias Weidner, `"<mamawe@cpan.org>"`

## SEE ALSO

perl, CheckDigits, *www.pruefziffernberechnung.de*,