crypto-js/src/md5.js

(function(){

// Shortcuts
var C = Crypto,
    util = C.util,
    charenc = C.charenc,
    UTF8 = charenc.UTF8,
    Binary = charenc.Binary;

// Public API
var MD5 = C.MD5 = function (message, options) {
	var digestbytes = util.wordsToBytes(MD5._md5(message));
	return options && options.asBytes ? digestbytes :
	       options && options.asString ? Binary.bytesToString(digestbytes) :
	       util.bytesToHex(digestbytes);
};

// The core
MD5._md5 = function (message) {

	// Convert to byte array
	if (message.constructor == String) message = UTF8.stringToBytes(message);
	/* else, assume byte array already */

	var m = util.bytesToWords(message),
	    l = message.length * 8,
	    a =  1732584193,
	    b = -271733879,
	    c = -1732584194,
	    d =  271733878;

	// Swap endian
	for (var i = 0; i < m.length; i++) {
		m[i] = ((m[i] <<  8) | (m[i] >>> 24)) & 0x00FF00FF |
		       ((m[i] << 24) | (m[i] >>>  8)) & 0xFF00FF00;
	}

	// Padding
	m[l >>> 5] |= 0x80 << (l % 32);
	m[(((l + 64) >>> 9) << 4) + 14] = l;

	// Method shortcuts
	var FF = MD5._ff,
	    GG = MD5._gg,
	    HH = MD5._hh,
	    II = MD5._ii;

	for (var i = 0; i < m.length; i += 16) {

		var aa = a,
		    bb = b,
		    cc = c,
		    dd = d;

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

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

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

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

		a = (a + aa) >>> 0;
		b = (b + bb) >>> 0;
		c = (c + cc) >>> 0;
		d = (d + dd) >>> 0;

	}

	return util.endian([a, b, c, d]);

};

// Auxiliary functions
MD5._ff  = function (a, b, c, d, x, s, t) {
	var n = a + (b & c | ~b & d) + (x >>> 0) + t;
	return ((n << s) | (n >>> (32 - s))) + b;
};
MD5._gg  = function (a, b, c, d, x, s, t) {
	var n = a + (b & d | c & ~d) + (x >>> 0) + t;
	return ((n << s) | (n >>> (32 - s))) + b;
};
MD5._hh  = function (a, b, c, d, x, s, t) {
	var n = a + (b ^ c ^ d) + (x >>> 0) + t;
	return ((n << s) | (n >>> (32 - s))) + b;
};
MD5._ii  = function (a, b, c, d, x, s, t) {
	var n = a + (c ^ (b | ~d)) + (x >>> 0) + t;
	return ((n << s) | (n >>> (32 - s))) + b;
};

// Package private blocksize
MD5._blocksize = 16;

MD5._digestsize = 16;

})();