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md5.js
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md5.js
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/*
* jMd5
*
* Based off js implementation at http://www.myersdaily.org/joseph/javascript/md5-text.html
*
* To hash a string call StreamMD5.hash("hello")
* If you wish to "stream" data use state = StreamMD5.init(), StreamMD5.update(state, 'new') and StreamMD5.finalize(state)
* It closely relates to how php's hash_init works
*
* Modified by James Hartig <[email protected]>
*/
(function() {
var HAS_BUFFERS = (typeof Buffer !== 'undefined'),
HAS_UINT8ARRAY = (typeof Uint8Array !== 'undefined')
undefined;
if (HAS_BUFFERS) {
function bufferCharCodeAt(buf, offset) {
return buf.readUInt8(offset);
}
function bufferSubstring(buf, start, end) {
return buf.slice(start, end);
}
function bufferConcat(buf, buf2) {
if (buf === null) {
return buf2;
}
return Buffer.concat([buf, buf2]);
}
}
if (HAS_UINT8ARRAY) {
function uint8ArraySubstring(uint8Array, start, end) {
return uint8Array.subarray(start, end);
}
function uint8ArrayConcat(uint8Array1, uint8Array2) {
if (uint8Array1 === null) {
return uint8Array2;
}
var tmp = new Uint8Array(uint8Array1.length + uint8Array2.length);
tmp.set(uint8Array1, 0);
tmp.set(uint8Array2, uint8Array1.length);
return tmp;
}
}
function stringCharCodeAt(string, offset) {
return string.charCodeAt(offset);
}
function stringSubstring(string, start, end) {
return string.substring(start, end);
}
function stringConcat(string, string2) {
if (string === null) {
return string2;
}
return string + string2;
}
function arrayCharCodeAt(array, offset) {
return array[offset];
}
function arrayStringCharCodeAt(array, offset) {
return array[offset].charCodeAt(0);
}
function arraySubstring(array, start, end) {
return array.slice(start, end);
}
function arrayConcat(array, array2) {
if (array === null) {
return array2;
}
return array.concat(array2);
}
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 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 init() {
return [1732584193, -271733879, -1732584194, 271733878, 0, null];
}
//progressive md51
function update(state, s) {
var len = s.length,
substring, charCodeAt, concat;
if (HAS_BUFFERS && (s instanceof Buffer)) {
substring = bufferSubstring;
charCodeAt = bufferCharCodeAt;
concat = bufferConcat;
} else if (s instanceof Array) {
substring = arraySubstring;
if (typeof s[0] === 'string') {
charCodeAt = arrayStringCharCodeAt;
} else {
charCodeAt = arrayCharCodeAt;
}
concat = arrayConcat;
} else if (HAS_UINT8ARRAY && (s instanceof Uint8Array)) {
substring = uint8ArraySubstring;
charCodeAt = arrayCharCodeAt;
concat = uint8ArrayConcat;
} else {
substring = stringSubstring;
charCodeAt = stringCharCodeAt;
concat = stringConcat;
}
if (!state) {
state = init();
}
state[4] += len;
//if we have trailing data
if (state[5] !== null) {
s = concat(state[5], s);
state[5] = null;
len = s.length;
}
for (var i = 64; i <= len; i+=64) {
md5cycle(state, md5blk(substring(s, i-64, i), charCodeAt));
}
state[5] = concat(state[5], substring(s, i-64));
return state;
}
function finalize(state) {
var n = state[4],
s = state[5],
i, l;
//if we have trailing data
if (s !== null && s.length >= 64) {
//clear out last buffer since we're sending it to update
state[5] = null;
state = update(state, s);
s = state[5];
}
//todo: clean this up somehow
var substring, charCodeAt;
if (HAS_BUFFERS && (s instanceof Buffer)) {
substring = bufferSubstring;
charCodeAt = bufferCharCodeAt;
} else if (s instanceof Array) {
substring = arraySubstring;
if (typeof s[0] === 'string') {
charCodeAt = arrayStringCharCodeAt;
} else {
charCodeAt = arrayCharCodeAt;
}
} else if (HAS_UINT8ARRAY && (s instanceof Uint8Array)) {
substring = uint8ArraySubstring;
charCodeAt = arrayCharCodeAt;
} else {
substring = stringSubstring;
charCodeAt = stringCharCodeAt;
}
var tail = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
if (s !== null) {
for (i = 0, l = s.length; i < l; i++) {
tail[i >> 2] |= charCodeAt(s, i) << ((i % 4) << 3);
}
}
tail[i>>2] |= 0x80 << ((i%4) << 3);
if (i > 55) {
md5cycle(state, tail);
for (i=0; i<16; i++) tail[i] = 0;
}
tail[14] = n * 8;
md5cycle(state, tail);
state.pop(); //get rid of the data count
state.pop(); //get rid of the cache
return hex(state);
}
function md51(s, substring, charCodeAt) {
var state = init();
state[4] = s.length;
state[5] = s;
return finalize(state);
}
function md5blk(s, charCodeAt) { /* 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] = charCodeAt(s, i)
+ (charCodeAt(s, i+1) << 8)
+ (charCodeAt(s, i+2) << 16)
+ (charCodeAt(s, 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) {
for (var i=0; i<x.length; i++)
x[i] = rhex(x[i]);
return x.join('');
}
function add32(a, b) {
return (a + b) & 0xFFFFFFFF;
}
function hash(s) {
return md51(s);
}
//detect if in older IE and fallback to stupid version of add32
if (hash('hello') != '5d41402abc4b2a76b9719d911017c592') {
function add32(x, y) {
var lsw = (x & 0xFFFF) + (y & 0xFFFF),
msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
}
var StreamMD5 = {
init: init,
update: update,
finalize: finalize,
hash: hash
};
if (typeof module !== "undefined") {
module.exports = StreamMD5;
} else {
window.StreamMD5 = StreamMD5;
window.jsMd5 = StreamMD5; //backwards-compatibility
if (typeof define === 'function' && typeof define.amd === 'object' && define.amd) {
define('StreamMD5', function() {
return StreamMD5;
});
}
}
}());