md4.js

/*

 * A JavaScript implementation of the RSA Data Security, Inc. MD4 Message

 * Digest Algorithm, as defined in RFC 1320.

 * Version 2.1 Copyright (C) Jerrad Pierce, Paul Johnston 1999 - 2002.

 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet

 * Distributed under the BSD License

 * See http://pajhome.org.uk/crypt/md5 for more info.

 */

 

var hexcase = 0; 

var b64pad  = "";

var chrsz   = 8; 

 

function hex_md4(s){ return binl2hex(core_md4(str2binl(s), s.length * chrsz));}

function b64_md4(s){ return binl2b64(core_md4(str2binl(s), s.length * chrsz));}

function str_md4(s){ return binl2str(core_md4(str2binl(s), s.length * chrsz));}

function hex_hmac_md4(key, data) { return binl2hex(core_hmac_md4(key, data)); }

function b64_hmac_md4(key, data) { return binl2b64(core_hmac_md4(key, data)); }

function str_hmac_md4(key, data) { return binl2str(core_hmac_md4(key, data)); }

 

function md4_vm_test()

{

  return hex_md4("abc") == "a448017aaf21d8525fc10ae87aa6729d";

}

 

function core_md4(x, len)

{

  x[len >> 5] |= 0x80 

  x[(((len + 64) >>> 9) 

 

  var a =  1732584193;

  var b = -271733879;

  var c = -1732584194;

  var d =  271733878;

 

  for(var i = 0; i 

  {

    var olda = a;

    var oldb = b;

    var oldc = c;

    var oldd = d;

 

    a = md4_ff(a, b, c, d, x[i+ 0], 3 );

    d = md4_ff(d, a, b, c, x[i+ 1], 7 );

    c = md4_ff(c, d, a, b, x[i+ 2], 11);

    b = md4_ff(b, c, d, a, x[i+ 3], 19);

    a = md4_ff(a, b, c, d, x[i+ 4], 3 );

    d = md4_ff(d, a, b, c, x[i+ 5], 7 );

    c = md4_ff(c, d, a, b, x[i+ 6], 11);

    b = md4_ff(b, c, d, a, x[i+ 7], 19);

    a = md4_ff(a, b, c, d, x[i+ 8], 3 );

    d = md4_ff(d, a, b, c, x[i+ 9], 7 );

    c = md4_ff(c, d, a, b, x[i+10], 11);

    b = md4_ff(b, c, d, a, x[i+11], 19);

    a = md4_ff(a, b, c, d, x[i+12], 3 );

    d = md4_ff(d, a, b, c, x[i+13], 7 );

    c = md4_ff(c, d, a, b, x[i+14], 11);

    b = md4_ff(b, c, d, a, x[i+15], 19);

 

    a = md4_gg(a, b, c, d, x[i+ 0], 3 );

    d = md4_gg(d, a, b, c, x[i+ 4], 5 );

    c = md4_gg(c, d, a, b, x[i+ 8], 9 );

    b = md4_gg(b, c, d, a, x[i+12], 13);

    a = md4_gg(a, b, c, d, x[i+ 1], 3 );

    d = md4_gg(d, a, b, c, x[i+ 5], 5 );

    c = md4_gg(c, d, a, b, x[i+ 9], 9 );

    b = md4_gg(b, c, d, a, x[i+13], 13);

    a = md4_gg(a, b, c, d, x[i+ 2], 3 );

    d = md4_gg(d, a, b, c, x[i+ 6], 5 );

    c = md4_gg(c, d, a, b, x[i+10], 9 );

    b = md4_gg(b, c, d, a, x[i+14], 13);

    a = md4_gg(a, b, c, d, x[i+ 3], 3 );

    d = md4_gg(d, a, b, c, x[i+ 7], 5 );

    c = md4_gg(c, d, a, b, x[i+11], 9 );

    b = md4_gg(b, c, d, a, x[i+15], 13);

 

    a = md4_hh(a, b, c, d, x[i+ 0], 3 );

    d = md4_hh(d, a, b, c, x[i+ 8], 9 );

    c = md4_hh(c, d, a, b, x[i+ 4], 11);

    b = md4_hh(b, c, d, a, x[i+12], 15);

    a = md4_hh(a, b, c, d, x[i+ 2], 3 );

    d = md4_hh(d, a, b, c, x[i+10], 9 );

    c = md4_hh(c, d, a, b, x[i+ 6], 11);

    b = md4_hh(b, c, d, a, x[i+14], 15);

    a = md4_hh(a, b, c, d, x[i+ 1], 3 );

    d = md4_hh(d, a, b, c, x[i+ 9], 9 );

    c = md4_hh(c, d, a, b, x[i+ 5], 11);

    b = md4_hh(b, c, d, a, x[i+13], 15);

    a = md4_hh(a, b, c, d, x[i+ 3], 3 );

    d = md4_hh(d, a, b, c, x[i+11], 9 );

    c = md4_hh(c, d, a, b, x[i+ 7], 11);

    b = md4_hh(b, c, d, a, x[i+15], 15);

 

    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);

 

}

 

function md4_cmn(q, a, b, x, s, t)

{

  return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);

}

function md4_ff(a, b, c, d, x, s)

{

  return md4_cmn((b & c) | ((~b) & d), a, 0, x, s, 0);

}

function md4_gg(a, b, c, d, x, s)

{

  return md4_cmn((b & c) | (b & d) | (c & d), a, 0, x, s, 1518500249);

}

function md4_hh(a, b, c, d, x, s)

{

  return md4_cmn(b ^ c ^ d, a, 0, x, s, 1859775393);

}

 

/*

 * Calculate the HMAC-MD4, of a key and some data

 */

function core_hmac_md4(key, data)

{

  var bkey = str2binl(key);

  if(bkey.length > 16) bkey = core_md4(bkey, key.length * chrsz);

 

  var ipad = Array(16), opad = Array(16);

  for(var i = 0; i 

  {

    ipad[i] = bkey[i] ^ 0x36363636;

    opad[i] = bkey[i] ^ 0x5C5C5C5C;

  }

 

  var hash = core_md4(ipad.concat(str2binl(data)), 512 + data.length * chrsz);

  return core_md4(opad.concat(hash), 512 + 128);

}

 

function safe_add(x, y)

{

  var lsw = (x & 0xFFFF) + (y & 0xFFFF);

  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);

  return (msw 

}

 

function rol(num, cnt)

{

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

}

 

function str2binl(str)

{

  var bin = Array();

  var mask = (1 

  for(var i = 0; i 

    bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) 

  return bin;

}

 

function binl2str(bin)

{

  var str = "";

  var mask = (1 

  for(var i = 0; i 

    str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);

  return str;

}

 

function binl2hex(binarray)

{

  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";

  var str = "";

  for(var i = 0; i 

  {

    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +

           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);

  }

  return str;

}

 

function binl2b64(binarray)

{

  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

  var str = "";

  for(var i = 0; i 

  {

    var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) 

                | (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) 

                |  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);

    for(var j = 0; j 

    {

      if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;

      else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);

    }

  }

  return str;

}