September Morn Update
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212
Task/MD4/JavaScript/md4.js
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212
Task/MD4/JavaScript/md4.js
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const md4func = () => {
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const hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
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const b64pad = ""; /* base-64 pad character. "=" for strict RFC compliance */
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const chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
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const tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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const hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
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/**
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* Add integers, wrapping at 2^32. This uses 16-bit operations internally
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* to work around bugs in some JS interpreters.
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*/
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const safe_add = (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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/**
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* Bitwise rotate a 32-bit number to the left.
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*/
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const rol = (num, cnt) => (num << cnt) | (num >>> (32 - cnt));
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/**
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* Convert a string to an array of little-endian words
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* If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
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*/
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const str2binl = str => {
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const bin = Array();
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const mask = (1 << chrsz) - 1;
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for (let i = 0; i < str.length * chrsz; i += chrsz)
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bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32);
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return bin;
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};
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/**
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* Convert an array of little-endian words to a string
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*/
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const binl2str = bin => {
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let str = "";
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const mask = (1 << chrsz) - 1;
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for (let i = 0; i < bin.length * 32; i += chrsz)
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str += String.fromCharCode((bin[i >> 5] >>> (i % 32)) & mask);
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return str;
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};
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/**
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* Convert an array of little-endian words to a hex string.
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*/
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const binl2hex = binarray => {
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let str = "";
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for (let i = 0; i < binarray.length * 4; i++) {
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str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +
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hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF);
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}
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return str;
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};
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/**
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* Convert an array of little-endian words to a base-64 string
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*/
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const binl2b64 = binarray => {
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let str = "";
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for (let i = 0; i < binarray.length * 4; i += 3) {
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const triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16)
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| (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8)
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| ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF);
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for (let j = 0; j < 4; j++) {
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if (i * 8 + j * 6 > binarray.length * 32) str += b64pad;
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else str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F);
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}
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}
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return str;
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};
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/**
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* Calculate the MD4 of an array of little-endian words, and a bit length
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*/
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const core_md4 = (x, len) => {
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x[len >> 5] |= 0x80 << (len % 32);
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x[(((len + 64) >>> 9) << 4) + 14] = len;
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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 = md4_ff(a, b, c, d, x[i], 3);
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d = md4_ff(d, a, b, c, x[i + 1], 7);
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c = md4_ff(c, d, a, b, x[i + 2], 11);
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b = md4_ff(b, c, d, a, x[i + 3], 19);
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a = md4_ff(a, b, c, d, x[i + 4], 3);
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d = md4_ff(d, a, b, c, x[i + 5], 7);
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c = md4_ff(c, d, a, b, x[i + 6], 11);
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b = md4_ff(b, c, d, a, x[i + 7], 19);
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a = md4_ff(a, b, c, d, x[i + 8], 3);
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d = md4_ff(d, a, b, c, x[i + 9], 7);
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c = md4_ff(c, d, a, b, x[i + 10], 11);
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b = md4_ff(b, c, d, a, x[i + 11], 19);
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a = md4_ff(a, b, c, d, x[i + 12], 3);
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d = md4_ff(d, a, b, c, x[i + 13], 7);
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c = md4_ff(c, d, a, b, x[i + 14], 11);
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b = md4_ff(b, c, d, a, x[i + 15], 19);
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a = md4_gg(a, b, c, d, x[i], 3);
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d = md4_gg(d, a, b, c, x[i + 4], 5);
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c = md4_gg(c, d, a, b, x[i + 8], 9);
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b = md4_gg(b, c, d, a, x[i + 12], 13);
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a = md4_gg(a, b, c, d, x[i + 1], 3);
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d = md4_gg(d, a, b, c, x[i + 5], 5);
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c = md4_gg(c, d, a, b, x[i + 9], 9);
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b = md4_gg(b, c, d, a, x[i + 13], 13);
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a = md4_gg(a, b, c, d, x[i + 2], 3);
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d = md4_gg(d, a, b, c, x[i + 6], 5);
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c = md4_gg(c, d, a, b, x[i + 10], 9);
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b = md4_gg(b, c, d, a, x[i + 14], 13);
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a = md4_gg(a, b, c, d, x[i + 3], 3);
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d = md4_gg(d, a, b, c, x[i + 7], 5);
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c = md4_gg(c, d, a, b, x[i + 11], 9);
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b = md4_gg(b, c, d, a, x[i + 15], 13);
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a = md4_hh(a, b, c, d, x[i], 3);
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d = md4_hh(d, a, b, c, x[i + 8], 9);
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c = md4_hh(c, d, a, b, x[i + 4], 11);
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b = md4_hh(b, c, d, a, x[i + 12], 15);
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a = md4_hh(a, b, c, d, x[i + 2], 3);
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d = md4_hh(d, a, b, c, x[i + 10], 9);
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c = md4_hh(c, d, a, b, x[i + 6], 11);
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b = md4_hh(b, c, d, a, x[i + 14], 15);
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a = md4_hh(a, b, c, d, x[i + 1], 3);
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d = md4_hh(d, a, b, c, x[i + 9], 9);
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c = md4_hh(c, d, a, b, x[i + 5], 11);
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b = md4_hh(b, c, d, a, x[i + 13], 15);
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a = md4_hh(a, b, c, d, x[i + 3], 3);
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d = md4_hh(d, a, b, c, x[i + 11], 9);
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c = md4_hh(c, d, a, b, x[i + 7], 11);
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b = md4_hh(b, c, d, a, x[i + 15], 15);
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a = safe_add(a, olda);
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b = safe_add(b, oldb);
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c = safe_add(c, oldc);
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d = safe_add(d, oldd);
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}
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return Array(a, b, c, d);
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};
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/**
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* These functions implement the basic operation for each round of the
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* algorithm.
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*/
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const md4_cmn = (q, a, b, x, s, t) => safe_add(
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rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
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const md4_ff = (a, b, c, d, x, s) => md4_cmn(
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(b & c) | ((~b) & d), a, 0, x, s, 0);
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const md4_gg = (a, b, c, d, x, s) => md4_cmn(
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(b & c) | (b & d) | (c & d), a, 0, x, s, 1518500249);
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const md4_hh = (a, b, c, d, x, s) => md4_cmn(
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b ^ c ^ d, a, 0, x, s, 1859775393);
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/**
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* Calculate the HMAC-MD4, of a key and some data
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*/
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const core_hmac_md4 = (key, data) => {
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let bkey = str2binl(key);
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if (bkey.length > 16) {
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bkey = core_md4(bkey, key.length * chrsz)
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}
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const ipad = Array(16);
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const opad = Array(16);
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for (let i = 0; i < 16; i++) {
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ipad[i] = bkey[i] ^ 0x36363636;
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opad[i] = bkey[i] ^ 0x5C5C5C5C;
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}
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const hash = core_md4(
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ipad.concat(str2binl(data)), 512 + data.length * chrsz);
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return core_md4(opad.concat(hash), 512 + 128);
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};
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/**
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* These are the functions you'll usually want to call
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*/
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return {
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hex_md4: s => binl2hex(core_md4(str2binl(s), s.length * chrsz)),
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b64_md4: s => binl2b64(core_md4(str2binl(s), s.length * chrsz)),
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str_md4: s => binl2str(core_md4(str2binl(s), s.length * chrsz)),
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hex_hmac_md4: (key, data) => binl2hex(core_hmac_md4(key, data)),
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b64_hmac_md4: (key, data) => binl2b64(core_hmac_md4(key, data)),
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str_hmac_md4: (key, data) => binl2str(core_hmac_md4(key, data)),
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};
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};
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const md4 = md4func();
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console.log(md4.hex_md4('Rosetta Code'));
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