136 lines
5.6 KiB
JavaScript
136 lines
5.6 KiB
JavaScript
function md5(bytes) {
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const words = uint8ToUint32(bytes);
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const md5Bytes = wordsToMd5(words, bytes.length * 8);
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return uint32ToUint8(md5Bytes);
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}
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function uint32ToUint8(input) {
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const bytes = new Uint8Array(input.length * 4);
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for (let i = 0; i < input.length * 4; i++) {
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bytes[i] = (input[i >> 2] >>> ((i % 4) * 8)) & 0xff;
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}
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return bytes;
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}
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function getOutputLength(inputLength8) {
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return (((inputLength8 + 64) >>> 9) << 4) + 14 + 1;
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}
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function wordsToMd5(x, len) {
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const xpad = new Uint32Array(getOutputLength(len)).fill(0);
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xpad.set(x);
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xpad[len >> 5] |= 0x80 << len % 32;
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xpad[xpad.length - 1] = len;
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x = xpad;
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let a = 1732584193;
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let b = -271733879;
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let c = -1732584194;
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let d = 271733878;
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for (let i = 0; i < x.length; i += 16) {
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const olda = a;
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const oldb = b;
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const oldc = c;
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const oldd = d;
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a = md5ff(a, b, c, d, x[i], 7, -680876936);
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d = md5ff(d, a, b, c, x[i + 1], 12, -389564586);
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c = md5ff(c, d, a, b, x[i + 2], 17, 606105819);
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b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330);
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a = md5ff(a, b, c, d, x[i + 4], 7, -176418897);
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d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426);
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c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341);
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b = md5ff(b, c, d, a, x[i + 7], 22, -45705983);
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a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416);
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d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417);
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c = md5ff(c, d, a, b, x[i + 10], 17, -42063);
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b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162);
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a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682);
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d = md5ff(d, a, b, c, x[i + 13], 12, -40341101);
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c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290);
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b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329);
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a = md5gg(a, b, c, d, x[i + 1], 5, -165796510);
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d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632);
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c = md5gg(c, d, a, b, x[i + 11], 14, 643717713);
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b = md5gg(b, c, d, a, x[i], 20, -373897302);
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a = md5gg(a, b, c, d, x[i + 5], 5, -701558691);
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d = md5gg(d, a, b, c, x[i + 10], 9, 38016083);
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c = md5gg(c, d, a, b, x[i + 15], 14, -660478335);
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b = md5gg(b, c, d, a, x[i + 4], 20, -405537848);
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a = md5gg(a, b, c, d, x[i + 9], 5, 568446438);
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d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690);
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c = md5gg(c, d, a, b, x[i + 3], 14, -187363961);
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b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501);
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a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467);
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d = md5gg(d, a, b, c, x[i + 2], 9, -51403784);
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c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473);
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b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734);
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a = md5hh(a, b, c, d, x[i + 5], 4, -378558);
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d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463);
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c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562);
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b = md5hh(b, c, d, a, x[i + 14], 23, -35309556);
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a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060);
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d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353);
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c = md5hh(c, d, a, b, x[i + 7], 16, -155497632);
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b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640);
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a = md5hh(a, b, c, d, x[i + 13], 4, 681279174);
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d = md5hh(d, a, b, c, x[i], 11, -358537222);
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c = md5hh(c, d, a, b, x[i + 3], 16, -722521979);
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b = md5hh(b, c, d, a, x[i + 6], 23, 76029189);
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a = md5hh(a, b, c, d, x[i + 9], 4, -640364487);
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d = md5hh(d, a, b, c, x[i + 12], 11, -421815835);
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c = md5hh(c, d, a, b, x[i + 15], 16, 530742520);
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b = md5hh(b, c, d, a, x[i + 2], 23, -995338651);
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a = md5ii(a, b, c, d, x[i], 6, -198630844);
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d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415);
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c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905);
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b = md5ii(b, c, d, a, x[i + 5], 21, -57434055);
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a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571);
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d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606);
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c = md5ii(c, d, a, b, x[i + 10], 15, -1051523);
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b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799);
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a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359);
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d = md5ii(d, a, b, c, x[i + 15], 10, -30611744);
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c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380);
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b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649);
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a = md5ii(a, b, c, d, x[i + 4], 6, -145523070);
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d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379);
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c = md5ii(c, d, a, b, x[i + 2], 15, 718787259);
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b = md5ii(b, c, d, a, x[i + 9], 21, -343485551);
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a = safeAdd(a, olda);
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b = safeAdd(b, oldb);
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c = safeAdd(c, oldc);
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d = safeAdd(d, oldd);
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}
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return Uint32Array.of(a, b, c, d);
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}
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function uint8ToUint32(input) {
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if (input.length === 0) {
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return new Uint32Array();
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}
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const output = new Uint32Array(getOutputLength(input.length * 8)).fill(0);
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for (let i = 0; i < input.length; i++) {
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output[i >> 2] |= (input[i] & 0xff) << ((i % 4) * 8);
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}
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return output;
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}
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function safeAdd(x, y) {
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const lsw = (x & 0xffff) + (y & 0xffff);
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const msw = (x >> 16) + (y >> 16) + (lsw >> 16);
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return (msw << 16) | (lsw & 0xffff);
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}
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function bitRotateLeft(num, cnt) {
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return (num << cnt) | (num >>> (32 - cnt));
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}
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function md5cmn(q, a, b, x, s, t) {
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return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);
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}
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function md5ff(a, b, c, d, x, s, t) {
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return md5cmn((b & c) | (~b & d), a, b, x, s, t);
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}
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function md5gg(a, b, c, d, x, s, t) {
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return md5cmn((b & d) | (c & ~d), a, b, x, s, t);
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}
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function md5hh(a, b, c, d, x, s, t) {
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return md5cmn(b ^ c ^ d, a, b, x, s, t);
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}
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function md5ii(a, b, c, d, x, s, t) {
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return md5cmn(c ^ (b | ~d), a, b, x, s, t);
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}
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export default md5;
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