(function(export) {
  /*
   * 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.
   */

  /*
   * Configurable variables. You may need to tweak these to be compatible with
   * the server-side, but the defaults work in most cases.
   */
  var hexcase = 0;   /* hex output format. 0 - lowercase; 1 - uppercase        */
  var b64pad  = "";  /* base-64 pad character. "=" for strict RFC compliance   */

  /*
   * These are the functions you'll usually want to call
   * They take string arguments and return either hex or base-64 encoded strings
   */
  function hex_md5(s)    { return rstr2hex(rstr_md5(str2rstr_utf8(s))); }
  function b64_md5(s)    { return rstr2b64(rstr_md5(str2rstr_utf8(s))); }
  function any_md5(s, e) { return rstr2any(rstr_md5(str2rstr_utf8(s)), e); }
  function hex_hmac_md5(k, d)
    { return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
  function b64_hmac_md5(k, d)
    { return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
  function any_hmac_md5(k, d, e)
    { return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e); }

  /*
   * Perform a simple self-test to see if the VM is working
   */
  function md5_vm_test()
  {
    return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72";
  }

  /*
   * Calculate the MD5 of a raw string
   */
  function rstr_md5(s)
  {
    return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
  }

  /*
   * Calculate the HMAC-MD5, of a key and some data (raw strings)
   */
  function rstr_hmac_md5(key, data)
  {
    var bkey = rstr2binl(key);
    if(bkey.length > 16) bkey = binl_md5(bkey, key.length * 8);

    var ipad = Array(16), opad = Array(16);
    for(var i = 0; i < 16; i++)
    {
      ipad[i] = bkey[i] ^ 0x36363636;
      opad[i] = bkey[i] ^ 0x5C5C5C5C;
    }

    var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
    return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
  }

  /*
   * Convert a raw string to a hex string
   */
  function rstr2hex(input)
  {
    try { hexcase } catch(e) { hexcase=0; }
    var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
    var output = "";
    var x;
    for(var i = 0; i < input.length; i++)
    {
      x = input.charCodeAt(i);
      output += hex_tab.charAt((x >>> 4) & 0x0F)
             +  hex_tab.charAt( x        & 0x0F);
    }
    return output;
  }

  /*
   * Convert a raw string to a base-64 string
   */
  function rstr2b64(input)
  {
    try { b64pad } catch(e) { b64pad=''; }
    var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
    var output = "";
    var len = input.length;
    for(var i = 0; i < len; i += 3)
    {
      var triplet = (input.charCodeAt(i) << 16)
                  | (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)
                  | (i + 2 < len ? input.charCodeAt(i+2)      : 0);
      for(var j = 0; j < 4; j++)
      {
        if(i * 8 + j * 6 > input.length * 8) output += b64pad;
        else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);
      }
    }
    return output;
  }

  /*
   * Convert a raw string to an arbitrary string encoding
   */
  function rstr2any(input, encoding)
  {
    var divisor = encoding.length;
    var i, j, q, x, quotient;

    /* Convert to an array of 16-bit big-endian values, forming the dividend */
    var dividend = Array(Math.ceil(input.length / 2));
    for(i = 0; i < dividend.length; i++)
    {
      dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
    }

    /*
     * Repeatedly perform a long division. The binary array forms the dividend,
     * the length of the encoding is the divisor. Once computed, the quotient
     * forms the dividend for the next step. All remainders are stored for later
     * use.
     */
    var full_length = Math.ceil(input.length * 8 /
                                      (Math.log(encoding.length) / Math.log(2)));
    var remainders = Array(full_length);
    for(j = 0; j < full_length; j++)
    {
      quotient = Array();
      x = 0;
      for(i = 0; i < dividend.length; i++)
      {
        x = (x << 16) + dividend[i];
        q = Math.floor(x / divisor);
        x -= q * divisor;
        if(quotient.length > 0 || q > 0)
          quotient[quotient.length] = q;
      }
      remainders[j] = x;
      dividend = quotient;
    }

    /* Convert the remainders to the output string */
    var output = "";
    for(i = remainders.length - 1; i >= 0; i--)
      output += encoding.charAt(remainders[i]);

    return output;
  }

  /*
   * Encode a string as utf-8.
   * For efficiency, this assumes the input is valid utf-16.
   */
  function str2rstr_utf8(input)
  {
    var output = "";
    var i = -1;
    var x, y;

    while(++i < input.length)
    {
      /* Decode utf-16 surrogate pairs */
      x = input.charCodeAt(i);
      y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
      if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)
      {
        x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
        i++;
      }

      /* Encode output as utf-8 */
      if(x <= 0x7F)
        output += String.fromCharCode(x);
      else if(x <= 0x7FF)
        output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),
                                      0x80 | ( x         & 0x3F));
      else if(x <= 0xFFFF)
        output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
                                      0x80 | ((x >>> 6 ) & 0x3F),
                                      0x80 | ( x         & 0x3F));
      else if(x <= 0x1FFFFF)
        output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
                                      0x80 | ((x >>> 12) & 0x3F),
                                      0x80 | ((x >>> 6 ) & 0x3F),
                                      0x80 | ( x         & 0x3F));
    }
    return output;
  }

  /*
   * Encode a string as utf-16
   */
  function str2rstr_utf16le(input)
  {
    var output = "";
    for(var i = 0; i < input.length; i++)
      output += String.fromCharCode( input.charCodeAt(i)        & 0xFF,
                                    (input.charCodeAt(i) >>> 8) & 0xFF);
    return output;
  }

  function str2rstr_utf16be(input)
  {
    var output = "";
    for(var i = 0; i < input.length; i++)
      output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
                                     input.charCodeAt(i)        & 0xFF);
    return output;
  }

  /*
   * Convert a raw string to an array of little-endian words
   * Characters >255 have their high-byte silently ignored.
   */
  function rstr2binl(input)
  {
    var output = Array(input.length >> 2);
    for(var i = 0; i < output.length; i++)
      output[i] = 0;
    for(var i = 0; i < input.length * 8; i += 8)
      output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
    return output;
  }

  /*
   * Convert an array of little-endian words to a string
   */
  function binl2rstr(input)
  {
    var output = "";
    for(var i = 0; i < input.length * 32; i += 8)
      output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
    return output;
  }

  /*
   * Calculate the MD5 of an array of little-endian words, and a bit length.
   */
  function binl_md5(x, len)
  {
    /* append padding */
    x[len >> 5] |= 0x80 << ((len) % 32);
    x[(((len + 64) >>> 9) << 4) + 14] = len;

    var a =  1732584193;
    var b = -271733879;
    var c = -1732584194;
    var d =  271733878;

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

      a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
      d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
      c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
      b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
      a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
      d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
      c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
      b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
      a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
      d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
      c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
      b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
      a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
      d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
      c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
      b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

      a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
      d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
      c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
      b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
      a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
      d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
      c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
      b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
      a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
      d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
      c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
      b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
      a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
      d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
      c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
      b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

      a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
      d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
      c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
      b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
      a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
      d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
      c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
      b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
      a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
      d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
      c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
      b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
      a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
      d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
      c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
      b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

      a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
      d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
      c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
      b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
      a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
      d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
      c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
      b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
      a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
      d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
      c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
      b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
      a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
      d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
      c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
      b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

      a = safe_add(a, olda);
      b = safe_add(b, oldb);
      c = safe_add(c, oldc);
      d = safe_add(d, oldd);
    }
    return Array(a, b, c, d);
  }

  /*
   * These functions implement the four basic operations the algorithm uses.
   */
  function md5_cmn(q, a, b, x, s, t)
  {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
  }
  function md5_ff(a, b, c, d, x, s, t)
  {
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
  }
  function md5_gg(a, b, c, d, x, s, t)
  {
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
  }
  function md5_hh(a, b, c, d, x, s, t)
  {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t);
  }
  function md5_ii(a, b, c, d, x, s, t)
  {
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
  }

  /*
   * Add integers, wrapping at 2^32. This uses 16-bit operations internally
   * to work around bugs in some JS interpreters.
   */
  function safe_add(x, y)
  {
    var lsw = (x & 0xFFFF) + (y & 0xFFFF);
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
    return (msw << 16) | (lsw & 0xFFFF);
  }

  /*
   * Bitwise rotate a 32-bit number to the left.
   */
  function bit_rol(num, cnt)
  {
    return (num << cnt) | (num >>> (32 - cnt));
  }

  export.MD5 = hex_md5;
})(window);