1Algorithm::CheckDigits:U:sMe9r7_C0o0n2t(r3i)buted Perl DAolcguomreintthamt:i:oCnheckDigits::M97_002(3)
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6 CheckDigits::M97_002 - compute check digits for International Bank
7 Account Number (IBAN)
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10 use Algorithm::CheckDigits;
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12 $iban = CheckDigits('iban');
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14 if ($iban->is_valid('DE88 2008 0000 09703 7570 0')) {
15 # do something
16 }
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18 $cn = $iban->complete('DE00 2008 0000 09703 7570 0');
19 # $cn = 'DE88 2008 0000 09703 7570 0'
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21 $cd = $iban->checkdigit('DE88 2008 0000 09703 7570 0');
22 # $cd = '88'
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24 $bn = $iban->basenumber('DE88 2008 0000 09703 7570 0');
25 # $bn = 'DE00 2008 0000 09703 7570 0'
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28 ALGORITHM
29 0 The IBAN number must be prepared. The first two letters and the
30 checksum will be moved to the right end. The letters are
31 substituted according to the substitute table and the checksum is
32 set to '00'.
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34 1 The whole number is taken modulo 97.
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36 2 The checksum is difference between 98 and the result of step 1.
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38 3 If the checksum is smaller then 10, a leading zero will be
39 prepended.
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41 METHODS
42 is_valid($number)
43 Returns true only if $number consists solely of numbers and the
44 last digit is a valid check digit according to the algorithm given
45 above.
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47 Returns false otherwise,
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49 complete($number)
50 The check digit for $number is computed and concatenated to the end
51 of $number.
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53 Returns the complete number with check digit or '' if $number does
54 not consist solely of digits and spaces.
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56 basenumber($number)
57 Returns the basenumber of $number if $number has a valid check
58 digit.
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60 Return '' otherwise.
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62 checkdigit($number)
63 Returns the checkdigits of $number if $number has a valid check
64 digit.
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66 Return '' otherwise.
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68 EXPORT
69 None by default.
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72 Mathias Weidner, "<mamawe@cpan.org>"
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75 Detlef Pilzecker pointed out to me that there may be more letters as
76 the first two in an IBAN number. He also made me aware of a faster
77 method to compute the check number than using Math::BigInt.
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80 perl, CheckDigits, www.pruefziffernberechnung.de,
81 www.sic.ch/en/tkicch_home/tkicch_standardization/tkicch_financialinstitutions_ibanipi.htm.
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85perl v5.28.1 2019-02-02Algorithm::CheckDigits::M97_002(3)