hashcalc.html

<html>
<head>
<title>VPN password hash calculator</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>VPN password hash calculator</h1>
<script type="text/javascript">


// Settings
var OrgSalt = "Please replace this value with unique long random string! E.g.: NYLVfq7kKUc9Aj7KtddMs7ECZV3dloBYRN2wTQigMlQfmoyHqu";
var MinLength = 10;
var scryptNLog2 = 17;


// Code starts here
function calculate() {
    document.calculator.hash.value = "";
    document.calculator.line.value = "";
    if(document.calculator.pass.value != document.calculator.pass2.value) {
        alert("Both passwords must match.");
        return;
    }
    if(document.calculator.user.value.trim().length < 1) {
        alert("Username must NOT be empty.");
        return;
    }
    if(!document.calculator.user.value.trim().match(/^[A-Za-z0-9_\-\.@]+$/g)) {
        alert("Username can contain only: \n* letters, \n* digits, \n* characters: _ - . @\n\nUsername cannot contain space character.");
        return;
    }
    var passtocheck = document.calculator.pass.value.trim();
    for (var i = 0; i < passtocheck.length; ++i) {
        if(passtocheck.charCodeAt(i) < 32 || passtocheck.charCodeAt(i) > 126) {
            alert("Password can contain only ASCII characters. \nI.e. letters with diacritical marks (and some other characters) cannot be used.");
            return;
        }
    }
    if(document.calculator.pass.value.trim().length < MinLength) {
        alert("Password must be at least "+MinLength+" characters long (leading/trailing spaces are removed).");
        return;
    }
    document.calculator.user.readOnly = true;
    document.calculator.pass.readOnly = true;
    document.calculator.pass2.readOnly = true;
    document.calculator.submit.disabled = true;
    try {
        scrypt(StringToBytesArray(document.calculator.pass.value.trim()+OrgSalt), StringToBytesArray(document.calculator.user.value.trim().toLowerCase()), Math.pow(2, scryptNLog2), 8, 1, 32, function(error, progress, key) {
            if (error) {
                throw error;
            } else if (key) {
                var hexkey = "";
                for (var i = 0; i < key.length; ++i) {
                    if(key[i] < 16) hexkey += "0";
                    hexkey += key[i].toString(16);
                }
                document.calculator.hash.value = hexkey;
                document.calculator.line.value = document.calculator.user.value.trim().toLowerCase()+" "+hexkey;
                document.calculator.user.readOnly = false;
                document.calculator.pass.readOnly = false;
                document.calculator.pass2.readOnly = false;
                document.calculator.submit.disabled = false;
            } else {
                document.calculator.hash.value = Math.floor(progress*100)+"% completed";
            }
        });
    } catch (e) {
        document.calculator.hash.value = "";
        document.calculator.line.value = "";
        document.calculator.user.readOnly = false;
        document.calculator.pass.readOnly = false;
        document.calculator.pass2.readOnly = false;
        document.calculator.submit.disabled = false;
        alert("Unexpected error occurred: \n"+e);
    }
}

function StringToBytesArray(str) {
    bytes = [];
    for (var i = 0; i < str.length; ++i) {
      bytes = bytes.concat([str.charCodeAt(i)]);
    }
    return bytes;
}


// Code from https://github.com/ricmoo/scrypt-js/blob/master/scrypt.js BEGINS
//
// The MIT License (MIT)
//
// Copyright (c) 2016 Richard Moore
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.


(function(root) {
    var MAX_VALUE = 0x7fffffff;

    // The SHA256 and PBKDF2 implementation are from scrypt-async-js:
    // See: https://github.com/dchest/scrypt-async-js
    function SHA256(m) {
        var K = [
           0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
           0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
           0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
           0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
           0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
           0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
           0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
           0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
           0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
           0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
           0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
           0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
           0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
       ];

        var h0 = 0x6a09e667, h1 = 0xbb67ae85, h2 = 0x3c6ef372, h3 = 0xa54ff53a;
        var h4 = 0x510e527f, h5 = 0x9b05688c, h6 = 0x1f83d9ab, h7 = 0x5be0cd19;
        var w = new Array(64);

        function blocks(p) {
            var off = 0, len = p.length;
            while (len >= 64) {
                var a = h0, b = h1, c = h2, d = h3, e = h4, f = h5, g = h6, h = h7, u, i, j, t1, t2;

                for (i = 0; i < 16; i++) {
                    j = off + i*4;
                    w[i] = ((p[j] & 0xff)<<24) | ((p[j+1] & 0xff)<<16) |
                    ((p[j+2] & 0xff)<<8) | (p[j+3] & 0xff);
                }

                for (i = 16; i < 64; i++) {
                    u = w[i-2];
                    t1 = ((u>>>17) | (u<<(32-17))) ^ ((u>>>19) | (u<<(32-19))) ^ (u>>>10);

                    u = w[i-15];
                    t2 = ((u>>>7) | (u<<(32-7))) ^ ((u>>>18) | (u<<(32-18))) ^ (u>>>3);

                    w[i] = (((t1 + w[i-7]) | 0) + ((t2 + w[i-16]) | 0)) | 0;
                }

                for (i = 0; i < 64; i++) {
                    t1 = ((((((e>>>6) | (e<<(32-6))) ^ ((e>>>11) | (e<<(32-11))) ^
                             ((e>>>25) | (e<<(32-25)))) + ((e & f) ^ (~e & g))) | 0) +
                          ((h + ((K[i] + w[i]) | 0)) | 0)) | 0;

                    t2 = ((((a>>>2) | (a<<(32-2))) ^ ((a>>>13) | (a<<(32-13))) ^
                           ((a>>>22) | (a<<(32-22)))) + ((a & b) ^ (a & c) ^ (b & c))) | 0;

                    h = g;
                    g = f;
                    f = e;
                    e = (d + t1) | 0;
                    d = c;
                    c = b;
                    b = a;
                    a = (t1 + t2) | 0;
                }

                h0 = (h0 + a) | 0;
                h1 = (h1 + b) | 0;
                h2 = (h2 + c) | 0;
                h3 = (h3 + d) | 0;
                h4 = (h4 + e) | 0;
                h5 = (h5 + f) | 0;
                h6 = (h6 + g) | 0;
                h7 = (h7 + h) | 0;

                off += 64;
                len -= 64;
            }
        }

        blocks(m);

        var i, bytesLeft = m.length % 64,
        bitLenHi = (m.length / 0x20000000) | 0,
        bitLenLo = m.length << 3,
        numZeros = (bytesLeft < 56) ? 56 : 120,
        p = m.slice(m.length - bytesLeft, m.length);

        p.push(0x80);
        for (i = bytesLeft + 1; i < numZeros; i++) { p.push(0); }
        p.push((bitLenHi>>>24) & 0xff);
        p.push((bitLenHi>>>16) & 0xff);
        p.push((bitLenHi>>>8)  & 0xff);
        p.push((bitLenHi>>>0)  & 0xff);
        p.push((bitLenLo>>>24) & 0xff);
        p.push((bitLenLo>>>16) & 0xff);
        p.push((bitLenLo>>>8)  & 0xff);
        p.push((bitLenLo>>>0)  & 0xff);

        blocks(p);

        return [
            (h0>>>24) & 0xff, (h0>>>16) & 0xff, (h0>>>8) & 0xff, (h0>>>0) & 0xff,
            (h1>>>24) & 0xff, (h1>>>16) & 0xff, (h1>>>8) & 0xff, (h1>>>0) & 0xff,
            (h2>>>24) & 0xff, (h2>>>16) & 0xff, (h2>>>8) & 0xff, (h2>>>0) & 0xff,
            (h3>>>24) & 0xff, (h3>>>16) & 0xff, (h3>>>8) & 0xff, (h3>>>0) & 0xff,
            (h4>>>24) & 0xff, (h4>>>16) & 0xff, (h4>>>8) & 0xff, (h4>>>0) & 0xff,
            (h5>>>24) & 0xff, (h5>>>16) & 0xff, (h5>>>8) & 0xff, (h5>>>0) & 0xff,
            (h6>>>24) & 0xff, (h6>>>16) & 0xff, (h6>>>8) & 0xff, (h6>>>0) & 0xff,
            (h7>>>24) & 0xff, (h7>>>16) & 0xff, (h7>>>8) & 0xff, (h7>>>0) & 0xff
        ];
    }

    function PBKDF2_HMAC_SHA256_OneIter(password, salt, dkLen) {
        // compress password if it's longer than hash block length
        password = password.length <= 64 ? password : SHA256(password);

        var i;
        var innerLen = 64 + salt.length + 4;
        var inner = new Array(innerLen);
        var outerKey = new Array(64);
        var dk = [];

        // inner = (password ^ ipad) || salt || counter
        for (i = 0; i < 64; i++) inner[i] = 0x36;
        for (i = 0; i < password.length; i++) inner[i] ^= password[i];
        for (i = 0; i < salt.length; i++) inner[64+i] = salt[i];
        for (i = innerLen - 4; i < innerLen; i++) inner[i] = 0;

        // outerKey = password ^ opad
        for (i = 0; i < 64; i++) outerKey[i] = 0x5c;
        for (i = 0; i < password.length; i++) outerKey[i] ^= password[i];

        // increments counter inside inner
        function incrementCounter() {
            for (var i = innerLen-1; i >= innerLen-4; i--) {
                inner[i]++;
                if (inner[i] <= 0xff) return;
                inner[i] = 0;
            }
        }

        // output blocks = SHA256(outerKey || SHA256(inner)) ...
        while (dkLen >= 32) {
            incrementCounter();
            dk = dk.concat(SHA256(outerKey.concat(SHA256(inner))));
            dkLen -= 32;
        }
        if (dkLen > 0) {
            incrementCounter();
            dk = dk.concat(SHA256(outerKey.concat(SHA256(inner))).slice(0, dkLen));
        }

        return dk;
    }

    // The following is an adaptation of scryptsy
    // See: https://www.npmjs.com/package/scryptsy
    function blockmix_salsa8(BY, Yi, r, x, _X) {
        var i;

        arraycopy(BY, (2 * r - 1) * 16, _X, 0, 16);
        for (i = 0; i < 2 * r; i++) {
            blockxor(BY, i * 16, _X, 16);
            salsa20_8(_X, x);
            arraycopy(_X, 0, BY, Yi + (i * 16), 16);
        }

        for (i = 0; i < r; i++) {
            arraycopy(BY, Yi + (i * 2) * 16, BY, (i * 16), 16);
        }

        for (i = 0; i < r; i++) {
            arraycopy(BY, Yi + (i * 2 + 1) * 16, BY, (i + r) * 16, 16);
        }
    }

    function R(a, b) {
        return (a << b) | (a >>> (32 - b));
    }

    function salsa20_8(B, x) {
        arraycopy(B, 0, x, 0, 16);

        for (var i = 8; i > 0; i -= 2) {
            x[ 4] ^= R(x[ 0] + x[12], 7);
            x[ 8] ^= R(x[ 4] + x[ 0], 9);
            x[12] ^= R(x[ 8] + x[ 4], 13);
            x[ 0] ^= R(x[12] + x[ 8], 18);
            x[ 9] ^= R(x[ 5] + x[ 1], 7);
            x[13] ^= R(x[ 9] + x[ 5], 9);
            x[ 1] ^= R(x[13] + x[ 9], 13);
            x[ 5] ^= R(x[ 1] + x[13], 18);
            x[14] ^= R(x[10] + x[ 6], 7);
            x[ 2] ^= R(x[14] + x[10], 9);
            x[ 6] ^= R(x[ 2] + x[14], 13);
            x[10] ^= R(x[ 6] + x[ 2], 18);
            x[ 3] ^= R(x[15] + x[11], 7);
            x[ 7] ^= R(x[ 3] + x[15], 9);
            x[11] ^= R(x[ 7] + x[ 3], 13);
            x[15] ^= R(x[11] + x[ 7], 18);
            x[ 1] ^= R(x[ 0] + x[ 3], 7);
            x[ 2] ^= R(x[ 1] + x[ 0], 9);
            x[ 3] ^= R(x[ 2] + x[ 1], 13);
            x[ 0] ^= R(x[ 3] + x[ 2], 18);
            x[ 6] ^= R(x[ 5] + x[ 4], 7);
            x[ 7] ^= R(x[ 6] + x[ 5], 9);
            x[ 4] ^= R(x[ 7] + x[ 6], 13);
            x[ 5] ^= R(x[ 4] + x[ 7], 18);
            x[11] ^= R(x[10] + x[ 9], 7);
            x[ 8] ^= R(x[11] + x[10], 9);
            x[ 9] ^= R(x[ 8] + x[11], 13);
            x[10] ^= R(x[ 9] + x[ 8], 18);
            x[12] ^= R(x[15] + x[14], 7);
            x[13] ^= R(x[12] + x[15], 9);
            x[14] ^= R(x[13] + x[12], 13);
            x[15] ^= R(x[14] + x[13], 18);
        }

        for (i = 0; i < 16; ++i) {
            B[i] += x[i];
        }
    }

    // naive approach... going back to loop unrolling may yield additional performance
    function blockxor(S, Si, D, len) {
        for (var i = 0; i < len; i++) {
            D[i] ^= S[Si + i]
        }
    }

    function arraycopy(src, srcPos, dest, destPos, length) {
        while (length--) {
            dest[destPos++] = src[srcPos++];
        }
    }

    function checkBufferish(o) {
        if (!o || typeof(o.length) !== 'number') {
            return false;
        }
        for (var i = 0; i < o.length; i++) {
            if (typeof(o[i]) !== 'number') { return false; }

            var v = parseInt(o[i]);
            if (v != o[i] || v < 0 || v >= 256) {
                return false;
            }
        }
        return true;
    }

    function ensureInteger(value, name) {
        var intValue = parseInt(value);
        if (value != intValue) { throw new Error('invalid ' + name); }
        return intValue;
    }

    // N = Cpu cost, r = Memory cost, p = parallelization cost
    // callback(error, progress, key)
    function scrypt(password, salt, N, r, p, dkLen, callback) {

        if (!callback) { throw new Error('missing callback'); }

        N = ensureInteger(N, 'N');
        r = ensureInteger(r, 'r');
        p = ensureInteger(p, 'p');

        dkLen = ensureInteger(dkLen, 'dkLen');

        if (N === 0 || (N & (N - 1)) !== 0) { throw new Error('N must be power of 2'); }

        if (N > MAX_VALUE / 128 / r) { throw new Error('N too large'); }
        if (r > MAX_VALUE / 128 / p) { throw new Error('r too large'); }

        if (!checkBufferish(password)) {
            throw new Error('password must be an array or buffer');
        }
        password = Array.prototype.slice.call(password);

        if (!checkBufferish(salt)) {
            throw new Error('salt must be an array or buffer');
        }
        salt = Array.prototype.slice.call(salt);

        var b = PBKDF2_HMAC_SHA256_OneIter(password, salt, p * 128 * r);
        var B = new Uint32Array(p * 32 * r)
        for (var i = 0; i < B.length; i++) {
            var j = i * 4;
            B[i] = ((b[j + 3] & 0xff) << 24) |
                   ((b[j + 2] & 0xff) << 16) |
                   ((b[j + 1] & 0xff) << 8) |
                   ((b[j + 0] & 0xff) << 0);
        }

        var XY = new Uint32Array(64 * r);
        var V = new Uint32Array(32 * r * N);

        var Yi = 32 * r;

        // scratch space
        var x = new Uint32Array(16);       // salsa20_8
        var _X = new Uint32Array(16);      // blockmix_salsa8

        var totalOps = p * N * 2;
        var currentOp = 0;
        var lastPercent10 = null;

        // Set this to true to abandon the scrypt on the next step
        var stop = false;

        // State information
        var state = 0;
        var i0 = 0, i1;
        var Bi;

        // How many blockmix_salsa8 can we do per step?
        var limit = parseInt(1000 / r);

        // Trick from scrypt-async; if there is a setImmediate shim in place, use it
        var nextTick = (typeof(setImmediate) !== 'undefined') ? setImmediate : setTimeout;

        // This is really all I changed; making scryptsy a state machine so we occasionally
        // stop and give other evnts on the evnt loop a chance to run. ~RicMoo
        var incrementalSMix = function() {
            if (stop) {
                return callback(new Error('cancelled'), currentOp / totalOps);
            }

            switch (state) {
                case 0:
                    // for (var i = 0; i < p; i++)...
                    Bi = i0 * 32 * r;

                    arraycopy(B, Bi, XY, 0, Yi);                       // ROMix - 1

                    state = 1;                                         // Move to ROMix 2
                    i1 = 0;

                    // Fall through

                case 1:

                    // Run up to 1000 steps of the first inner smix loop
                    var steps = N - i1;
                    if (steps > limit) { steps = limit; }
                    for (var i = 0; i < steps; i++) {                  // ROMix - 2
                        arraycopy(XY, 0, V, (i1 + i) * Yi, Yi)         // ROMix - 3
                        blockmix_salsa8(XY, Yi, r, x, _X);             // ROMix - 4
                    }

                    // for (var i = 0; i < N; i++)
                    i1 += steps;
                    currentOp += steps;

                    // Call the callback with the progress (optionally stopping us)
                    var percent10 = parseInt(1000 * currentOp / totalOps);
                    if (percent10 !== lastPercent10) {
                        stop = callback(null, currentOp / totalOps);
                        if (stop) { break; }
                        lastPercent10 = percent10;
                    }

                    if (i1 < N) {
                        break;
                    }

                    i1 = 0;                                          // Move to ROMix 6
                    state = 2;

                    // Fall through

                case 2:

                    // Run up to 1000 steps of the second inner smix loop
                    var steps = N - i1;
                    if (steps > limit) { steps = limit; }
                    for (var i = 0; i < steps; i++) {                // ROMix - 6
                        var offset = (2 * r - 1) * 16;               // ROMix - 7
                        var j = XY[offset] & (N - 1);
                        blockxor(V, j * Yi, XY, Yi);                 // ROMix - 8 (inner)
                        blockmix_salsa8(XY, Yi, r, x, _X);           // ROMix - 9 (outer)
                    }

                    // for (var i = 0; i < N; i++)...
                    i1 += steps;
                    currentOp += steps;

                    // Call the callback with the progress (optionally stopping us)
                    var percent10 = parseInt(1000 * currentOp / totalOps);
                    if (percent10 !== lastPercent10) {
                        stop = callback(null, currentOp / totalOps);
                        if (stop) { break; }
                        lastPercent10 = percent10;
                    }

                    if (i1 < N) {
                        break;
                    }

                    arraycopy(XY, 0, B, Bi, Yi);                     // ROMix - 10

                    // for (var i = 0; i < p; i++)...
                    i0++;
                    if (i0 < p) {
                        state = 0;
                        break;
                    }

                    b = [];
                    for (var i = 0; i < B.length; i++) {
                        b.push((B[i] >>  0) & 0xff);
                        b.push((B[i] >>  8) & 0xff);
                        b.push((B[i] >> 16) & 0xff);
                        b.push((B[i] >> 24) & 0xff);
                    }

                    var derivedKey = PBKDF2_HMAC_SHA256_OneIter(password, b, dkLen);

                    // Done; don't break (which would reschedule)
                    return callback(null, 1.0, derivedKey);
                }

                // Schedule the next steps
                nextTick(incrementalSMix);
            }

            // Bootstrap the incremental smix
            incrementalSMix();
    }

    // node.js
    if (typeof(exports) !== 'undefined') {
       module.exports = scrypt;

    // RequireJS/AMD
    // http://www.requirejs.org/docs/api.html
    // https://github.com/amdjs/amdjs-api/wiki/AMD
    } else if (typeof(define) === 'function' && define.amd) {
        define(scrypt);

    // Web Browsers
    } else if (root) {

        // If there was an existing library "scrypt", make sure it is still available
        if (root.scrypt) {
            root._scrypt = root.scrypt;
        }

        root.scrypt = scrypt;
    }

})(this);

// Code from https://github.com/ricmoo/scrypt-js/blob/master/scrypt.js ENDS


// Code from https://github.com/YuzuJS/setImmediate/blob/master/setImmediate.js BEGINS
//
// Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


(function (global, undefined) {
    "use strict";

    if (global.setImmediate) {
        return;
    }

    var nextHandle = 1; // Spec says greater than zero
    var tasksByHandle = {};
    var currentlyRunningATask = false;
    var doc = global.document;
    var registerImmediate;

    function setImmediate(callback) {
      // Callback can either be a function or a string
      if (typeof callback !== "function") {
        callback = new Function("" + callback);
      }
      // Copy function arguments
      var args = new Array(arguments.length - 1);
      for (var i = 0; i < args.length; i++) {
          args[i] = arguments[i + 1];
      }
      // Store and register the task
      var task = { callback: callback, args: args };
      tasksByHandle[nextHandle] = task;
      registerImmediate(nextHandle);
      return nextHandle++;
    }

    function clearImmediate(handle) {
        delete tasksByHandle[handle];
    }

    function run(task) {
        var callback = task.callback;
        var args = task.args;
        switch (args.length) {
        case 0:
            callback();
            break;
        case 1:
            callback(args[0]);
            break;
        case 2:
            callback(args[0], args[1]);
            break;
        case 3:
            callback(args[0], args[1], args[2]);
            break;
        default:
            callback.apply(undefined, args);
            break;
        }
    }

    function runIfPresent(handle) {
        // From the spec: "Wait until any invocations of this algorithm started before this one have completed."
        // So if we're currently running a task, we'll need to delay this invocation.
        if (currentlyRunningATask) {
            // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
            // "too much recursion" error.
            setTimeout(runIfPresent, 0, handle);
        } else {
            var task = tasksByHandle[handle];
            if (task) {
                currentlyRunningATask = true;
                try {
                    run(task);
                } finally {
                    clearImmediate(handle);
                    currentlyRunningATask = false;
                }
            }
        }
    }

    function installNextTickImplementation() {
        registerImmediate = function(handle) {
            process.nextTick(function () { runIfPresent(handle); });
        };
    }

    function canUsePostMessage() {
        // The test against `importScripts` prevents this implementation from being installed inside a web worker,
        // where `global.postMessage` means something completely different and can't be used for this purpose.
        if (global.postMessage && !global.importScripts) {
            var postMessageIsAsynchronous = true;
            var oldOnMessage = global.onmessage;
            global.onmessage = function() {
                postMessageIsAsynchronous = false;
            };
            global.postMessage("", "*");
            global.onmessage = oldOnMessage;
            return postMessageIsAsynchronous;
        }
    }

    function installPostMessageImplementation() {
        // Installs an event handler on `global` for the `message` event: see
        // * https://developer.mozilla.org/en/DOM/window.postMessage
        // * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages

        var messagePrefix = "setImmediate$" + Math.random() + "$";
        var onGlobalMessage = function(event) {
            if (event.source === global &&
                typeof event.data === "string" &&
                event.data.indexOf(messagePrefix) === 0) {
                runIfPresent(+event.data.slice(messagePrefix.length));
            }
        };

        if (global.addEventListener) {
            global.addEventListener("message", onGlobalMessage, false);
        } else {
            global.attachEvent("onmessage", onGlobalMessage);
        }

        registerImmediate = function(handle) {
            global.postMessage(messagePrefix + handle, "*");
        };
    }

    function installMessageChannelImplementation() {
        var channel = new MessageChannel();
        channel.port1.onmessage = function(event) {
            var handle = event.data;
            runIfPresent(handle);
        };

        registerImmediate = function(handle) {
            channel.port2.postMessage(handle);
        };
    }

    function installReadyStateChangeImplementation() {
        var html = doc.documentElement;
        registerImmediate = function(handle) {
            // Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
            // into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
            var script = doc.createElement("script");
            script.onreadystatechange = function () {
                runIfPresent(handle);
                script.onreadystatechange = null;
                html.removeChild(script);
                script = null;
            };
            html.appendChild(script);
        };
    }

    function installSetTimeoutImplementation() {
        registerImmediate = function(handle) {
            setTimeout(runIfPresent, 0, handle);
        };
    }

    // If supported, we should attach to the prototype of global, since that is where setTimeout et al. live.
    var attachTo = Object.getPrototypeOf && Object.getPrototypeOf(global);
    attachTo = attachTo && attachTo.setTimeout ? attachTo : global;

    // Don't get fooled by e.g. browserify environments.
    if ({}.toString.call(global.process) === "[object process]") {
        // For Node.js before 0.9
        installNextTickImplementation();

    } else if (canUsePostMessage()) {
        // For non-IE10 modern browsers
        installPostMessageImplementation();

    } else if (global.MessageChannel) {
        // For web workers, where supported
        installMessageChannelImplementation();

    } else if (doc && "onreadystatechange" in doc.createElement("script")) {
        // For IE 6–8
        installReadyStateChangeImplementation();

    } else {
        // For older browsers
        installSetTimeoutImplementation();
    }

    attachTo.setImmediate = setImmediate;
    attachTo.clearImmediate = clearImmediate;
}(typeof self === "undefined" ? typeof global === "undefined" ? this : global : self));

// Code from https://github.com/YuzuJS/setImmediate/blob/master/setImmediate.js ENDS


if(OrgSalt == "Please replace this value with unique long random string! E.g.: NYLVfq7kKUc9Aj7KtddMs7ECZV3dloBYRN2wTQigMlQfmoyHqu") {
    document.write('<p style="color: red; font-weight: bold;">WARNING! Default Organization Salt is used. <br />If you are setting up OpenVPN-auth-scrypt for your OpenVPN instance, please read the <a href="https://github.com/DavisNT/OpenVPN-auth-scrypt/blob/master/README.md" target="_blank">README.md</a> and set OrgSalt to a random value used for your setup! <br />If you are trying to get access to existing VPN and have downloaded this script from GitHub to generate hash for your password, then please contact administrator of the VPN to get the proper script!</p>');
}

</script>
<form name="calculator" action="javascript:calculate()">
Username: <input type="text" name="user" style="width: 100%;"><br /><br />
Password: <input type="password" name="pass" style="width: 100%;"><br /><br />
Confirm password: <input type="password" name="pass2" style="width: 100%;"><br /><br />
Hash: <input type="text" readonly name="hash" style="width: 100%;"><br /><br />
Line: <input type="text" readonly name="line" style="width: 100%;"><br /><br />
<input type="submit" name="submit" value="Calculate" style="width: 100%;">
</form>
<br /><br />
<p align="center" style="font-size: small;">
Copyright &copy; 2018&ndash;2019 Dāvis Mošenkovs<br /><br />
<a href="https://github.com/DavisNT/OpenVPN-auth-scrypt" target="_blank">GitHub page</a>
</p>
</body>
</html>