/*

* Browser-compatible JavaScript MD5
*
* Modification of JavaScript MD5
* https://github.com/blueimp/JavaScript-MD5
*
* Copyright 2011, Sebastian Tschan
* https://blueimp.net
*
* Licensed under the MIT license:
* https://opensource.org/licenses/MIT
*
* Based on
* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* Distributed under the BSD License
* See http://pajhome.org.uk/crypt/md5 for more info.
*/

'use strict';

function md5(bytes) {

if (typeof(bytes) == 'string') {
  var msg = unescape(encodeURIComponent(bytes)); // UTF8 escape
  bytes = new Array(msg.length);
  for (var i = 0; i < msg.length; i++) bytes[i] = msg.charCodeAt(i);
}

return md5ToHexEncodedArray(
  wordsToMd5(
    bytesToWords(bytes)
    , bytes.length * 8)
);

}

/*

*/ function md5ToHexEncodedArray(input) {

var i;
var x;
var output = [];
var length32 = input.length * 32;
var hexTab = '0123456789abcdef';
var hex;

for (i = 0; i < length32; i += 8) {
  x = (input[i >> 5] >>> (i % 32)) & 0xFF;

  hex = parseInt(hexTab.charAt((x >>> 4) & 0x0F) + hexTab.charAt(x & 0x0F), 16);

  output.push(hex);
}
return output;

}

/*

*/ function wordsToMd5(x, len) {

/* append padding */
x[len >> 5] |= 0x80 << (len % 32);
x[(((len + 64) >>> 9) << 4) + 14] = len;

var i;
var olda;
var oldb;
var oldc;
var oldd;
var a = 1732584193;
var b = -271733879;
var c = -1732584194;

var d = 271733878;

for (i = 0; i < x.length; i += 16) {
  olda = a;
  oldb = b;
  oldc = c;
  oldd = d;

  a = md5ff(a, b, c, d, x[i], 7, -680876936);
  d = md5ff(d, a, b, c, x[i + 1], 12, -389564586);
  c = md5ff(c, d, a, b, x[i + 2], 17, 606105819);
  b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330);
  a = md5ff(a, b, c, d, x[i + 4], 7, -176418897);
  d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426);
  c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341);
  b = md5ff(b, c, d, a, x[i + 7], 22, -45705983);
  a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416);
  d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417);
  c = md5ff(c, d, a, b, x[i + 10], 17, -42063);
  b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162);
  a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682);
  d = md5ff(d, a, b, c, x[i + 13], 12, -40341101);
  c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290);
  b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329);

  a = md5gg(a, b, c, d, x[i + 1], 5, -165796510);
  d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632);
  c = md5gg(c, d, a, b, x[i + 11], 14, 643717713);
  b = md5gg(b, c, d, a, x[i], 20, -373897302);
  a = md5gg(a, b, c, d, x[i + 5], 5, -701558691);
  d = md5gg(d, a, b, c, x[i + 10], 9, 38016083);
  c = md5gg(c, d, a, b, x[i + 15], 14, -660478335);
  b = md5gg(b, c, d, a, x[i + 4], 20, -405537848);
  a = md5gg(a, b, c, d, x[i + 9], 5, 568446438);
  d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690);
  c = md5gg(c, d, a, b, x[i + 3], 14, -187363961);
  b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501);
  a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467);
  d = md5gg(d, a, b, c, x[i + 2], 9, -51403784);
  c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473);
  b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734);

  a = md5hh(a, b, c, d, x[i + 5], 4, -378558);
  d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463);
  c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562);
  b = md5hh(b, c, d, a, x[i + 14], 23, -35309556);
  a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060);
  d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353);
  c = md5hh(c, d, a, b, x[i + 7], 16, -155497632);
  b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640);
  a = md5hh(a, b, c, d, x[i + 13], 4, 681279174);
  d = md5hh(d, a, b, c, x[i], 11, -358537222);
  c = md5hh(c, d, a, b, x[i + 3], 16, -722521979);
  b = md5hh(b, c, d, a, x[i + 6], 23, 76029189);
  a = md5hh(a, b, c, d, x[i + 9], 4, -640364487);
  d = md5hh(d, a, b, c, x[i + 12], 11, -421815835);
  c = md5hh(c, d, a, b, x[i + 15], 16, 530742520);
  b = md5hh(b, c, d, a, x[i + 2], 23, -995338651);

  a = md5ii(a, b, c, d, x[i], 6, -198630844);
  d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415);
  c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905);
  b = md5ii(b, c, d, a, x[i + 5], 21, -57434055);
  a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571);
  d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606);
  c = md5ii(c, d, a, b, x[i + 10], 15, -1051523);
  b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799);
  a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359);
  d = md5ii(d, a, b, c, x[i + 15], 10, -30611744);
  c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380);
  b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649);
  a = md5ii(a, b, c, d, x[i + 4], 6, -145523070);
  d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379);
  c = md5ii(c, d, a, b, x[i + 2], 15, 718787259);
  b = md5ii(b, c, d, a, x[i + 9], 21, -343485551);

  a = safeAdd(a, olda);
  b = safeAdd(b, oldb);
  c = safeAdd(c, oldc);
  d = safeAdd(d, oldd);
}
return [a, b, c, d];

}

/*

*/ function bytesToWords(input) {

var i;
var output = [];
output[(input.length >> 2) - 1] = undefined;
for (i = 0; i < output.length; i += 1) {
  output[i] = 0;
}
var length8 = input.length * 8;
for (i = 0; i < length8; i += 8) {
  output[i >> 5] |= (input[(i / 8)] & 0xFF) << (i % 32);
}

return output;

}

/*

*/ function safeAdd(x, y) {

var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);

}

/*

*/ function bitRotateLeft(num, cnt) {

return (num << cnt) | (num >>> (32 - cnt));

}

/*

*/ function md5cmn(q, a, b, x, s, t) {

return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);

} function md5ff(a, b, c, d, x, s, t) {

return md5cmn((b & c) | ((~b) & d), a, b, x, s, t);

} function md5gg(a, b, c, d, x, s, t) {

return md5cmn((b & d) | (c & (~d)), a, b, x, s, t);

} function md5hh(a, b, c, d, x, s, t) {

return md5cmn(b ^ c ^ d, a, b, x, s, t);

} function md5ii(a, b, c, d, x, s, t) {

return md5cmn(c ^ (b | (~d)), a, b, x, s, t);

}

module.exports = md5;