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