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md5.js
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md5.js
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/* **
This Javascript MD5 is based on implementation from ez2 (http://2basix.nl/page.php?al=javascript%20fast%20md5)
which is based on Joseph Meyers implementation (http://www.myersdaily.org/joseph/javascript/md5-text.html)
*/
(function () {
function cmn(q, a, b, x, s, t)
{
a = add32(add32(a, q), add32(x, t));
return add32((a << s) | (a >>> (32 - s)), b);
}
function ff(a, b, c, d, x, s, t)
{ return cmn((b & c) | ((~b) & d), a, b, x, s, t); }
function gg(a, b, c, d, x, s, t)
{ return cmn((b & d) | (c & (~d)), a, b, x, s, t); }
function hh(a, b, c, d, x, s, t)
{ return cmn(b ^ c ^ d, a, b, x, s, t); }
function ii(a, b, c, d, x, s, t)
{ return cmn(c ^ (b | (~d)), a, b, x, s, t); }
function md5cycle(x, k)
{
var a = x[0],
b = x[1],
c = x[2],
d = x[3];
a = ff(a, b, c, d, k[0], 7, -680876936);
d = ff(d, a, b, c, k[1], 12, -389564586);
c = ff(c, d, a, b, k[2], 17, 606105819);
b = ff(b, c, d, a, k[3], 22, -1044525330);
a = ff(a, b, c, d, k[4], 7, -176418897);
d = ff(d, a, b, c, k[5], 12, 1200080426);
c = ff(c, d, a, b, k[6], 17, -1473231341);
b = ff(b, c, d, a, k[7], 22, -45705983);
a = ff(a, b, c, d, k[8], 7, 1770035416);
d = ff(d, a, b, c, k[9], 12, -1958414417);
c = ff(c, d, a, b, k[10], 17, -42063);
b = ff(b, c, d, a, k[11], 22, -1990404162);
a = ff(a, b, c, d, k[12], 7, 1804603682);
d = ff(d, a, b, c, k[13], 12, -40341101);
c = ff(c, d, a, b, k[14], 17, -1502002290);
b = ff(b, c, d, a, k[15], 22, 1236535329);
a = gg(a, b, c, d, k[1], 5, -165796510);
d = gg(d, a, b, c, k[6], 9, -1069501632);
c = gg(c, d, a, b, k[11], 14, 643717713);
b = gg(b, c, d, a, k[0], 20, -373897302);
a = gg(a, b, c, d, k[5], 5, -701558691);
d = gg(d, a, b, c, k[10], 9, 38016083);
c = gg(c, d, a, b, k[15], 14, -660478335);
b = gg(b, c, d, a, k[4], 20, -405537848);
a = gg(a, b, c, d, k[9], 5, 568446438);
d = gg(d, a, b, c, k[14], 9, -1019803690);
c = gg(c, d, a, b, k[3], 14, -187363961);
b = gg(b, c, d, a, k[8], 20, 1163531501);
a = gg(a, b, c, d, k[13], 5, -1444681467);
d = gg(d, a, b, c, k[2], 9, -51403784);
c = gg(c, d, a, b, k[7], 14, 1735328473);
b = gg(b, c, d, a, k[12], 20, -1926607734);
a = hh(a, b, c, d, k[5], 4, -378558);
d = hh(d, a, b, c, k[8], 11, -2022574463);
c = hh(c, d, a, b, k[11], 16, 1839030562);
b = hh(b, c, d, a, k[14], 23, -35309556);
a = hh(a, b, c, d, k[1], 4, -1530992060);
d = hh(d, a, b, c, k[4], 11, 1272893353);
c = hh(c, d, a, b, k[7], 16, -155497632);
b = hh(b, c, d, a, k[10], 23, -1094730640);
a = hh(a, b, c, d, k[13], 4, 681279174);
d = hh(d, a, b, c, k[0], 11, -358537222);
c = hh(c, d, a, b, k[3], 16, -722521979);
b = hh(b, c, d, a, k[6], 23, 76029189);
a = hh(a, b, c, d, k[9], 4, -640364487);
d = hh(d, a, b, c, k[12], 11, -421815835);
c = hh(c, d, a, b, k[15], 16, 530742520);
b = hh(b, c, d, a, k[2], 23, -995338651);
a = ii(a, b, c, d, k[0], 6, -198630844);
d = ii(d, a, b, c, k[7], 10, 1126891415);
c = ii(c, d, a, b, k[14], 15, -1416354905);
b = ii(b, c, d, a, k[5], 21, -57434055);
a = ii(a, b, c, d, k[12], 6, 1700485571);
d = ii(d, a, b, c, k[3], 10, -1894986606);
c = ii(c, d, a, b, k[10], 15, -1051523);
b = ii(b, c, d, a, k[1], 21, -2054922799);
a = ii(a, b, c, d, k[8], 6, 1873313359);
d = ii(d, a, b, c, k[15], 10, -30611744);
c = ii(c, d, a, b, k[6], 15, -1560198380);
b = ii(b, c, d, a, k[13], 21, 1309151649);
a = ii(a, b, c, d, k[4], 6, -145523070);
d = ii(d, a, b, c, k[11], 10, -1120210379);
c = ii(c, d, a, b, k[2], 15, 718787259);
b = ii(b, c, d, a, k[9], 21, -343485551);
x[0] = add32(a, x[0]);
x[1] = add32(b, x[1]);
x[2] = add32(c, x[2]);
x[3] = add32(d, x[3]);
}
function md51(s)
{
// txt = '';
var n = s.length,
state = [1732584193, -271733879, -1732584194, 271733878], i;
for (i=64; i<=n; i+=64)
{ md5cycle(state, md5blk(s.substring(i-64, i))); }
s = s.substring(i-64);
var tail = [0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0],
sl=s.length;
for (i=0; i<sl; i++)
{ tail[i>>2] |= s.charCodeAt(i) << ((i%4) << 3); }
tail[i>>2] |= 0x80 << ((i%4) << 3);
if (i > 55)
{
md5cycle(state, tail);
i=16;
while (i--) { tail[i] = 0 }
// for (i=0; i<16; i++) tail[i] = 0;
}
tail[14] = n*8;
md5cycle(state, tail);
return state;
}
/* there needs to be support for Unicode here, unless we pretend that we can redefine the MD-5
* algorithm for multi-byte characters (perhaps by adding every four 16-bit characters and
* shortening the sum to 32 bits). Otherwise I suggest performing MD-5 as if every character
* was two bytes--e.g., 0040 0025 = @%--but then how will an ordinary MD-5 sum be matched?
* There is no way to standardize text to something like UTF-8 before transformation; speed cost is
* utterly prohibitive. The JavaScript standard itself needs to look at this: it should start
* providing access to strings as preformed UTF-8 8-bit unsigned value arrays.
*** */
function md5blk(s) /* I figured global was faster. */
{
var md5blks = [], i; /* Andy King said do it this way. */
for (i=0; i<64; i+=4) {
md5blks[i>>2] = s.charCodeAt(i)
+ (s.charCodeAt(i+1) << 8)
+ (s.charCodeAt(i+2) << 16)
+ (s.charCodeAt(i+3) << 24);
}
return md5blks;
}
var hex_chr = '0123456789abcdef'.split('');
function rhex(n)
{
var s='', j=0;
for(; j<4; j++) {
s += (hex_chr[(n >> (j * 8 + 4)) & 0x0F]
+ hex_chr[(n >> (j * 8)) & 0x0F]);
}
return s;
}
function hex(x) {
var l=x.length;
for (var i=0; i<l; i++)
{ x[i] = rhex(x[i]); }
return x.join('');
}
/* this function is much faster, so if possible we use it. Some IEs
* are the only ones I know of that need the idiotic second function,
* generated by an if clause.
*** */
var add32 = function (a, b) {
return (a + b) & 0xFFFFFFFF;
};
if (hex(md51("hello")) != "5d41402abc4b2a76b9719d911017c592")
{
add32 = function (x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF),
msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
}
function md5(v)
{
// Converts the string to UTF-8 "bytes" when necessary
// if(v.match(/[\x80-\xFF]/))
// { v = unescape(encodeURI(v)); }
v = unescape(encodeURI(v));
return hex(md51(v));
}
window['md5'] = md5;
})();
// vim: ts=4 sw=4 ai nowrap