ibantools-germany
Version:
IBAN Validator and Generator for German Bank Accounts
34 lines (33 loc) • 1.31 kB
JavaScript
;
/**
* ibantools-germany
* Copyright (c) 2022-2026 Markus Baumer <markus@baumer.dev>
* SPDX-License-Identifier: MIT OR MPL-2.0
*/
Object.defineProperty(exports, "__esModule", { value: true });
const helper_1 = require("../helper");
const method06_1 = require("./method06");
const method63Core = (number) => {
const paddedNumber = (0, helper_1.paddedAccountNumber)(number);
if (!paddedNumber.startsWith("0")) {
return "INVALID";
}
const digits = (0, helper_1.getDigits)(paddedNumber.slice(1, 8));
const givenCheckDigit = digits.pop(); // Check digit is last digit
const weightedDigits = (0, helper_1.weightDigitsRTL)(digits, [2, 1, 2, 1, 2, 1]);
const crossSums = (0, helper_1.calculateCrossSums)(weightedDigits);
const sum = (0, helper_1.calculateSum)(crossSums);
const calculatedCheckDigit = 10 - (0, helper_1.getUnitFromNumber)(sum);
return (0, method06_1.method06Result)(givenCheckDigit, calculatedCheckDigit);
};
exports.default = (number) => {
if (method63Core(number) === "VALID") {
return "VALID";
}
if (number.length > 8) {
return "INVALID";
}
// If validation fails, try checking it with trailing
// subaccount number 00 which is allowed to be omitted.
return method63Core(`${number}00`);
};