authenticator-clui/src/edbase32.js

A simple command-line authenticator with encryption (import accounts from Google Authenticator, Microsoft Authenticator and Facebook Authenticator)

//encode base32 in RFC 3548
const base32 = (function () {
    this.encode = encode;
    const charJson = {
        '0': 'A',
        '1': 'B',
        '2': 'C',
        '3': 'D',
        '4': 'E',
        '5': 'F',
        '6': 'G',
        '7': 'H',
        '8': 'I',
        '9': 'J',
        '10': 'K',
        '11': 'L',
        '12': 'M',
        '13': 'N',
        '14': 'O',
        '15': 'P',
        '16': 'Q',
        '17': 'R',
        '18': 'S',
        '19': 'T',
        '20': 'U',
        '21': 'V',
        '22': 'W',
        '23': 'X',
        '24': 'Y',
        '25': 'Z',
        '26': '2',
        '27': '3',
        '28': '4',
        '29': '5',
        '30': '6',
        '31': '7'
    }

    /**
     * 
     * @param {Uint8Array} input 
     */
    function encode(input) {
        if (typeof input == 'undefined' || input == null) {
            return null;
        }
        var aAscii2 = [];
        for (const ascii of input) {
            var ascii2 = ascii.toString(2);
            var gap = 8 - ascii2.length;
            var zeros = '';
            for (var i = 0; i < gap; i++) {
                zeros = '0' + zeros;
            }
            ascii2 = zeros + ascii2;

            aAscii2.push(ascii2);
        }

        var source = aAscii2.join('');

        var eArr = [];
        for (var i = 0; i < source.length; i += 5) {
            var s5 = source.substring(i, i + 5);
            if (s5.length < 5) {
                var gap = 5 - s5.length;
                var zeros = '';
                for (var gi = 0; gi < gap; gi++) {
                    zeros += '0';
                }
                s5 += zeros;
            }

            var eInt = parseInt(s5, 2)

            eArr.push(charJson[eInt]);
        }
        if (eArr.length % 8 != 0) {
            var gap = 8 - (eArr.length % 8);
            for (var i = 0; i < gap; i++) {
                eArr.push('=');
            }
        }
        var eStr = eArr.join('');

        return eStr;
    }

    return this;
})();

module.exports = {
    encode: base32.encode,
};