168 lines
5.8 KiB
TypeScript
168 lines
5.8 KiB
TypeScript
/*
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MD5 code originally written by Joseph Myers
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(Public Domain per https://github.com/satazor/js-spark-md5/issues/45)
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http://www.myersdaily.org/joseph/javascript/md5-text.html
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http://www.myersdaily.org/joseph/javascript/md5.js
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Lightly cleaned up and otherwise modified by Tony Garnock-Jones
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<tonyg@leastfixedpoint.com>, August 2022, to work with Uint8Array and
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TypeScript.
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*/
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function md5cycle(x: Uint32Array, k: Uint32Array) {
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let 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: number, a: number, b: number, x: number, s: number, t: number): number {
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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: number, b: number, c: number, d: number, x: number, s: number, t: number): number {
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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: number, b: number, c: number, d: number, x: number, s: number, t: number): number {
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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: number, b: number, c: number, d: number, x: number, s: number, t: number): number {
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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: number, b: number, c: number, d: number, x: number, s: number, t: number): number {
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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: Uint8Array): Uint8Array {
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const n = s.length;
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const state = Uint32Array.from([1732584193, -271733879, -1732584194, 271733878]);
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let i: number;
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for (i = 64; i <= s.length; i += 64) {
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md5cycle(state, md5blk(s.subarray(i - 64, i)));
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}
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s = s.subarray(i - 64);
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const tail = new Uint32Array(16);
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for (i = 0; i < s.length; i++) tail[i >> 2] |= s[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 new Uint8Array(state.buffer);
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}
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function md5blk(s: Uint8Array): Uint32Array {
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const md5blks = new Uint32Array(16);
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let j = 0;
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for (let i = 0; i < md5blks.length; i++, j+=4) {
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md5blks[i] = s[j] + (s[j + 1] << 8) + (s[j + 2] << 16) + (s[j + 3] << 24);
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}
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return md5blks;
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}
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const HEX_CHR = '0123456789abcdef';
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function rhex(digits: Array<string>, n: number): void {
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digits.push(HEX_CHR[(n >> 4) & 15]);
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digits.push(HEX_CHR[n & 15]);
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}
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export function hex(x: Uint8Array): string {
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const result: Array<string> = [];
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for (let i = 0; i < x.length; i++) rhex(result, x[i]);
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return result.join('');
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}
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export function md5(s: Uint8Array): string {
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return hex(md51(s));
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}
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function add32(a: number, b: number): number {
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return (a + b) & 0xFFFFFFFF;
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}
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if (md5(new TextEncoder().encode('hello')) != '5d41402abc4b2a76b9719d911017c592') {
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throw new Error('invalid md5 result');
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}
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