Short JS Encryption (Custom)

encx.js

var e = (function (i, d) {
        if (null == d || 0 >= d.length) return null;
        for (var a = "", b = 0; b < d.length; b++) a += d.charCodeAt(b).toString();
        var b = Math.floor(a.length / 5),
                g = parseInt(a.charAt(b) + a.charAt(2 * b) + a.charAt(3 * b) + a.charAt(4 * b) + a.charAt(5 * b), 10),
                j = Math.ceil(d.length / 2),
                h = Math.pow(2, 31) - 1;
        if (2 > g) return null;
        for (var c = Math.round(1E9 * Math.random()) % 1E8, a = a + c; 10 < a.length;) a = (parseInt(a.substring(0, 10), 10) + parseInt(a.substring(10, a.length), 10)).toString();
        for (var a = (g * a + j) % h, e = "", f = "", b = 0; b < i.length; b++) e = parseInt(i.charCodeAt(b) ^ Math.floor(255 * (a / h)), 10), f = 16 > e ? f + ("0" + e.toString(16)) : f + e.toString(16), a = (g * a + j) % h;
        for (c = c.toString(16); 8 > c.length;) c = "0" + c;
        return f + c
}); console.log(e("He is blue blonde \u00fc\u00e4\u00e4\u00e4\u00e4\u00e4\u00e4", "Ksnad"));

// OR THE CUT&PASTE CODE //

console.log(function(i,d){if(null==d||0>=d.length)return alert("Please enter a password with which to encrypt the message."),null;for(var a="",b=0;b<d.length;b++)a+=d.charCodeAt(b).toString();var b=Math.floor(a.length/5),g=parseInt(a.charAt(b)+a.charAt(2*b)+a.charAt(3*b)+a.charAt(4*b)+a.charAt(5*b),10),j=Math.ceil(d.length/2),h=Math.pow(2,31)-1;if(2>g)return alert("Algorithm cannot find a suitable hash. Please choose a different password. \nPossible considerations are to choose a more complex or longer password."),
null;for(var c=Math.round(1E9*Math.random())%1E8,a=a+c;10<a.length;)a=(parseInt(a.substring(0,10),10)+parseInt(a.substring(10,a.length),10)).toString();for(var a=(g*a+j)%h,e="",f="",b=0;b<i.length;b++)e=parseInt(i.charCodeAt(b)^Math.floor(255*(a/h)),10),f=16>e?f+("0"+e.toString(16)):f+e.toString(16),a=(g*a+j)%h;for(c=c.toString(16);8>c.length;)c="0"+c;return f+c}("He is blue blonde \u00fc\u00e4\u00e4\u00e4\u00e4\u00e4\u00e4", "Ksnad"));