phaser4-rex-plugins/plugins/string/xor/Encrypt.js

Plugins of phaser4

function encrypt(str, pwd) {
    if (pwd == null || pwd.length <= 0) {
        return null;
    }

    var prand = "";
    for (var i = 0; i < pwd.length; i++) {
        prand += pwd.charCodeAt(i).toString();
    }
    var spos = Math.floor(prand.length / 5);
    var mult = parseInt(prand.charAt(spos) + prand.charAt(spos * 2) + prand.charAt(spos * 3) + prand.charAt(spos * 4) + prand.charAt(spos * 5));
    var incr = Math.ceil(pwd.length / 2);
    var modu = Math.pow(2, 31) - 1;
    if (mult < 2) {
        return null;
    }
    var salt = Math.round(Math.random() * 1000000000) % 100000000;
    prand += salt;
    while (prand.length > 10) {
        prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
    }
    prand = (mult * prand + incr) % modu;
    var enc_chr = "";
    var enc_str = "";
    for (var i = 0; i < str.length; i++) {
        enc_chr = parseInt(str.charCodeAt(i) ^ Math.floor((prand / modu) * 255));
        if (enc_chr < 16) {
            enc_str += "0" + enc_chr.toString(16);
        } else {
            enc_str += enc_chr.toString(16);
        }
        prand = (mult * prand + incr) % modu;
    }
    salt = salt.toString(16);
    while (salt.length < 8) {
        salt = 0 + salt;
    }
    enc_str += salt;
    return enc_str;
}

export default function (src, pwd) {
    src = escape(src);
    pwd = escape(pwd.toString());
    return encrypt(src, pwd);
};