88 lines
2.8 KiB
JavaScript
88 lines
2.8 KiB
JavaScript
/**
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* Algorithmic validation functions
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* May be used as is or implemented in the workflow of other validators.
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*/
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/*
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* ISO 7064 validation function
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* Called with a string of numbers (incl. check digit)
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* to validate according to ISO 7064 (MOD 11, 10).
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*/
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export function iso7064Check(str) {
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var checkvalue = 10;
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for (var i = 0; i < str.length - 1; i++) {
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checkvalue = (parseInt(str[i], 10) + checkvalue) % 10 === 0 ? 10 * 2 % 11 : (parseInt(str[i], 10) + checkvalue) % 10 * 2 % 11;
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}
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checkvalue = checkvalue === 1 ? 0 : 11 - checkvalue;
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return checkvalue === parseInt(str[10], 10);
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}
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/*
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* Luhn (mod 10) validation function
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* Called with a string of numbers (incl. check digit)
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* to validate according to the Luhn algorithm.
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*/
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export function luhnCheck(str) {
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var checksum = 0;
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var second = false;
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for (var i = str.length - 1; i >= 0; i--) {
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if (second) {
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var product = parseInt(str[i], 10) * 2;
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if (product > 9) {
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// sum digits of product and add to checksum
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checksum += product.toString().split('').map(function (a) {
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return parseInt(a, 10);
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}).reduce(function (a, b) {
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return a + b;
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}, 0);
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} else {
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checksum += product;
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}
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} else {
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checksum += parseInt(str[i], 10);
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}
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second = !second;
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}
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return checksum % 10 === 0;
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}
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/*
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* Reverse TIN multiplication and summation helper function
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* Called with an array of single-digit integers and a base multiplier
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* to calculate the sum of the digits multiplied in reverse.
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* Normally used in variations of MOD 11 algorithmic checks.
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*/
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export function reverseMultiplyAndSum(digits, base) {
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var total = 0;
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for (var i = 0; i < digits.length; i++) {
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total += digits[i] * (base - i);
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}
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return total;
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}
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/*
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* Verhoeff validation helper function
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* Called with a string of numbers
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* to validate according to the Verhoeff algorithm.
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*/
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export function verhoeffCheck(str) {
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var d_table = [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [1, 2, 3, 4, 0, 6, 7, 8, 9, 5], [2, 3, 4, 0, 1, 7, 8, 9, 5, 6], [3, 4, 0, 1, 2, 8, 9, 5, 6, 7], [4, 0, 1, 2, 3, 9, 5, 6, 7, 8], [5, 9, 8, 7, 6, 0, 4, 3, 2, 1], [6, 5, 9, 8, 7, 1, 0, 4, 3, 2], [7, 6, 5, 9, 8, 2, 1, 0, 4, 3], [8, 7, 6, 5, 9, 3, 2, 1, 0, 4], [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]];
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var p_table = [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [1, 5, 7, 6, 2, 8, 3, 0, 9, 4], [5, 8, 0, 3, 7, 9, 6, 1, 4, 2], [8, 9, 1, 6, 0, 4, 3, 5, 2, 7], [9, 4, 5, 3, 1, 2, 6, 8, 7, 0], [4, 2, 8, 6, 5, 7, 3, 9, 0, 1], [2, 7, 9, 3, 8, 0, 6, 4, 1, 5], [7, 0, 4, 6, 9, 1, 3, 2, 5, 8]]; // Copy (to prevent replacement) and reverse
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var str_copy = str.split('').reverse().join('');
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var checksum = 0;
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for (var i = 0; i < str_copy.length; i++) {
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checksum = d_table[checksum][p_table[i % 8][parseInt(str_copy[i], 10)]];
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}
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return checksum === 0;
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} |