234 lines
8.6 KiB
JavaScript
234 lines
8.6 KiB
JavaScript
/**
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* SHA3 (keccak) hash function, based on a new "Sponge function" design.
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* Different from older hashes, the internal state is bigger than output size.
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*
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* Check out [FIPS-202](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf),
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* [Website](https://keccak.team/keccak.html),
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* [the differences between SHA-3 and Keccak](https://crypto.stackexchange.com/questions/15727/what-are-the-key-differences-between-the-draft-sha-3-standard-and-the-keccak-sub).
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*
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* Check out `sha3-addons` module for cSHAKE, k12, and others.
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* @module
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*/
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import { rotlBH, rotlBL, rotlSH, rotlSL, split } from "./_u64.js";
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// prettier-ignore
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import { abytes, aexists, anumber, aoutput, clean, createHasher, createXOFer, Hash, swap32IfBE, toBytes, u32 } from "./utils.js";
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// No __PURE__ annotations in sha3 header:
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// EVERYTHING is in fact used on every export.
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// Various per round constants calculations
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const _0n = BigInt(0);
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const _1n = BigInt(1);
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const _2n = BigInt(2);
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const _7n = BigInt(7);
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const _256n = BigInt(256);
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const _0x71n = BigInt(0x71);
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const SHA3_PI = [];
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const SHA3_ROTL = [];
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const _SHA3_IOTA = [];
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for (let round = 0, R = _1n, x = 1, y = 0; round < 24; round++) {
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// Pi
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[x, y] = [y, (2 * x + 3 * y) % 5];
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SHA3_PI.push(2 * (5 * y + x));
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// Rotational
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SHA3_ROTL.push((((round + 1) * (round + 2)) / 2) % 64);
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// Iota
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let t = _0n;
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for (let j = 0; j < 7; j++) {
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R = ((R << _1n) ^ ((R >> _7n) * _0x71n)) % _256n;
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if (R & _2n)
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t ^= _1n << ((_1n << /* @__PURE__ */ BigInt(j)) - _1n);
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}
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_SHA3_IOTA.push(t);
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}
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const IOTAS = split(_SHA3_IOTA, true);
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const SHA3_IOTA_H = IOTAS[0];
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const SHA3_IOTA_L = IOTAS[1];
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// Left rotation (without 0, 32, 64)
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const rotlH = (h, l, s) => (s > 32 ? rotlBH(h, l, s) : rotlSH(h, l, s));
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const rotlL = (h, l, s) => (s > 32 ? rotlBL(h, l, s) : rotlSL(h, l, s));
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/** `keccakf1600` internal function, additionally allows to adjust round count. */
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export function keccakP(s, rounds = 24) {
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const B = new Uint32Array(5 * 2);
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// NOTE: all indices are x2 since we store state as u32 instead of u64 (bigints to slow in js)
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for (let round = 24 - rounds; round < 24; round++) {
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// Theta θ
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for (let x = 0; x < 10; x++)
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B[x] = s[x] ^ s[x + 10] ^ s[x + 20] ^ s[x + 30] ^ s[x + 40];
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for (let x = 0; x < 10; x += 2) {
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const idx1 = (x + 8) % 10;
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const idx0 = (x + 2) % 10;
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const B0 = B[idx0];
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const B1 = B[idx0 + 1];
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const Th = rotlH(B0, B1, 1) ^ B[idx1];
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const Tl = rotlL(B0, B1, 1) ^ B[idx1 + 1];
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for (let y = 0; y < 50; y += 10) {
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s[x + y] ^= Th;
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s[x + y + 1] ^= Tl;
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}
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}
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// Rho (ρ) and Pi (π)
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let curH = s[2];
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let curL = s[3];
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for (let t = 0; t < 24; t++) {
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const shift = SHA3_ROTL[t];
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const Th = rotlH(curH, curL, shift);
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const Tl = rotlL(curH, curL, shift);
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const PI = SHA3_PI[t];
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curH = s[PI];
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curL = s[PI + 1];
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s[PI] = Th;
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s[PI + 1] = Tl;
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}
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// Chi (χ)
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for (let y = 0; y < 50; y += 10) {
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for (let x = 0; x < 10; x++)
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B[x] = s[y + x];
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for (let x = 0; x < 10; x++)
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s[y + x] ^= ~B[(x + 2) % 10] & B[(x + 4) % 10];
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}
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// Iota (ι)
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s[0] ^= SHA3_IOTA_H[round];
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s[1] ^= SHA3_IOTA_L[round];
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}
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clean(B);
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}
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/** Keccak sponge function. */
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export class Keccak extends Hash {
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// NOTE: we accept arguments in bytes instead of bits here.
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constructor(blockLen, suffix, outputLen, enableXOF = false, rounds = 24) {
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super();
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this.pos = 0;
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this.posOut = 0;
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this.finished = false;
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this.destroyed = false;
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this.enableXOF = false;
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this.blockLen = blockLen;
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this.suffix = suffix;
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this.outputLen = outputLen;
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this.enableXOF = enableXOF;
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this.rounds = rounds;
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// Can be passed from user as dkLen
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anumber(outputLen);
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// 1600 = 5x5 matrix of 64bit. 1600 bits === 200 bytes
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// 0 < blockLen < 200
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if (!(0 < blockLen && blockLen < 200))
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throw new Error('only keccak-f1600 function is supported');
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this.state = new Uint8Array(200);
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this.state32 = u32(this.state);
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}
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clone() {
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return this._cloneInto();
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}
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keccak() {
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swap32IfBE(this.state32);
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keccakP(this.state32, this.rounds);
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swap32IfBE(this.state32);
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this.posOut = 0;
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this.pos = 0;
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}
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update(data) {
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aexists(this);
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data = toBytes(data);
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abytes(data);
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const { blockLen, state } = this;
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const len = data.length;
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for (let pos = 0; pos < len;) {
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const take = Math.min(blockLen - this.pos, len - pos);
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for (let i = 0; i < take; i++)
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state[this.pos++] ^= data[pos++];
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if (this.pos === blockLen)
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this.keccak();
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}
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return this;
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}
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finish() {
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if (this.finished)
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return;
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this.finished = true;
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const { state, suffix, pos, blockLen } = this;
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// Do the padding
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state[pos] ^= suffix;
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if ((suffix & 0x80) !== 0 && pos === blockLen - 1)
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this.keccak();
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state[blockLen - 1] ^= 0x80;
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this.keccak();
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}
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writeInto(out) {
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aexists(this, false);
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abytes(out);
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this.finish();
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const bufferOut = this.state;
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const { blockLen } = this;
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for (let pos = 0, len = out.length; pos < len;) {
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if (this.posOut >= blockLen)
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this.keccak();
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const take = Math.min(blockLen - this.posOut, len - pos);
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out.set(bufferOut.subarray(this.posOut, this.posOut + take), pos);
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this.posOut += take;
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pos += take;
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}
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return out;
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}
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xofInto(out) {
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// Sha3/Keccak usage with XOF is probably mistake, only SHAKE instances can do XOF
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if (!this.enableXOF)
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throw new Error('XOF is not possible for this instance');
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return this.writeInto(out);
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}
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xof(bytes) {
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anumber(bytes);
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return this.xofInto(new Uint8Array(bytes));
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}
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digestInto(out) {
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aoutput(out, this);
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if (this.finished)
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throw new Error('digest() was already called');
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this.writeInto(out);
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this.destroy();
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return out;
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}
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digest() {
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return this.digestInto(new Uint8Array(this.outputLen));
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}
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destroy() {
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this.destroyed = true;
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clean(this.state);
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}
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_cloneInto(to) {
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const { blockLen, suffix, outputLen, rounds, enableXOF } = this;
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to || (to = new Keccak(blockLen, suffix, outputLen, enableXOF, rounds));
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to.state32.set(this.state32);
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to.pos = this.pos;
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to.posOut = this.posOut;
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to.finished = this.finished;
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to.rounds = rounds;
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// Suffix can change in cSHAKE
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to.suffix = suffix;
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to.outputLen = outputLen;
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to.enableXOF = enableXOF;
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to.destroyed = this.destroyed;
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return to;
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}
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}
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const gen = (suffix, blockLen, outputLen) => createHasher(() => new Keccak(blockLen, suffix, outputLen));
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/** SHA3-224 hash function. */
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export const sha3_224 = /* @__PURE__ */ (() => gen(0x06, 144, 224 / 8))();
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/** SHA3-256 hash function. Different from keccak-256. */
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export const sha3_256 = /* @__PURE__ */ (() => gen(0x06, 136, 256 / 8))();
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/** SHA3-384 hash function. */
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export const sha3_384 = /* @__PURE__ */ (() => gen(0x06, 104, 384 / 8))();
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/** SHA3-512 hash function. */
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export const sha3_512 = /* @__PURE__ */ (() => gen(0x06, 72, 512 / 8))();
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/** keccak-224 hash function. */
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export const keccak_224 = /* @__PURE__ */ (() => gen(0x01, 144, 224 / 8))();
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/** keccak-256 hash function. Different from SHA3-256. */
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export const keccak_256 = /* @__PURE__ */ (() => gen(0x01, 136, 256 / 8))();
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/** keccak-384 hash function. */
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export const keccak_384 = /* @__PURE__ */ (() => gen(0x01, 104, 384 / 8))();
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/** keccak-512 hash function. */
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export const keccak_512 = /* @__PURE__ */ (() => gen(0x01, 72, 512 / 8))();
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const genShake = (suffix, blockLen, outputLen) => createXOFer((opts = {}) => new Keccak(blockLen, suffix, opts.dkLen === undefined ? outputLen : opts.dkLen, true));
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/** SHAKE128 XOF with 128-bit security. */
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export const shake128 = /* @__PURE__ */ (() => genShake(0x1f, 168, 128 / 8))();
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/** SHAKE256 XOF with 256-bit security. */
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export const shake256 = /* @__PURE__ */ (() => genShake(0x1f, 136, 256 / 8))();
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//# sourceMappingURL=sha3.js.map
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