783 lines
No EOL
30 KiB
JavaScript
783 lines
No EOL
30 KiB
JavaScript
/**
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* SHA3 (keccak) addons.
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*
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* * cSHAKE, KMAC, TupleHash, ParallelHash + XOF variants from
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* {@link https://csrc.nist.gov/pubs/sp/800/185/final | NIST SP 800-185}
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* * KangarooTwelve 🦘 and TurboSHAKE - reduced-round keccak from
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* {@link https://datatracker.ietf.org/doc/rfc9861/ | RFC 9861}
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* * KeccakPRG: Pseudo-random generator based on Keccak
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* ({@link https://keccak.team/files/CSF-0.1.pdf | pdf})
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* @module
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*/
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import { Keccak } from "./sha3.js";
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import { abytes, aexists, anumber, clean, copyBytes, createHasher, kdfInputToBytes, u32, } from "./utils.js";
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// cSHAKE && KMAC (NIST SP800-185)
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const _8n = /* @__PURE__ */ BigInt(8);
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const _ffn = /* @__PURE__ */ BigInt(0xff);
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// It is safe to use bigints here, since they used only for length encoding (not actual data).
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// We use bigints in sha256 for lengths too.
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// Callers are still expected to supply SP 800-185-valid lengths
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// (`0 <= x < 2^2040`); this helper does not enforce that bound.
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function leftEncode(n) {
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n = BigInt(n);
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const res = [Number(n & _ffn)];
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n >>= _8n;
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for (; n > 0; n >>= _8n)
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res.unshift(Number(n & _ffn));
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res.unshift(res.length);
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return new Uint8Array(res);
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}
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// Same caller contract as `leftEncode(...)`: lengths must already satisfy SP 800-185 §2.3.1.
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function rightEncode(n) {
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n = BigInt(n);
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const res = [Number(n & _ffn)];
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n >>= _8n;
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for (; n > 0; n >>= _8n)
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res.unshift(Number(n & _ffn));
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res.push(res.length);
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return new Uint8Array(res);
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}
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// `dkLen` validation is deferred to the downstream Keccak constructor.
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function chooseLen(opts, outputLen) {
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return opts.dkLen === undefined ? outputLen : opts.dkLen;
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}
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const abytesOrZero = (buf, title = '') => {
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if (buf === undefined)
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return EMPTY_BUFFER;
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abytes(buf, undefined, title);
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return buf;
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};
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// NOTE: second modulo is necessary since we don't need to add padding if the
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// current element takes a whole block.
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// Callers only pass the fixed positive Keccak rates here (`168` or `136`);
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// `block <= 0` is not validated locally.
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const getPadding = (len, block) => new Uint8Array((block - (len % block)) % block);
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// Personalization
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function cshakePers(hash, opts = {}) {
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const h = hash;
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if (!opts || (opts.personalization === undefined && opts.NISTfn === undefined))
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return h;
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// Encode and pad inplace to avoid unneccesary memory copies/slices so we
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// don't need to zero them later.
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// bytepad(encode_string(N) || encode_string(S), rate), where `rate` is the
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// current cSHAKE/KMAC/TupleHash/ParallelHash block length.
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const blockLenBytes = leftEncode(h.blockLen);
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const fn = opts.NISTfn === undefined ? EMPTY_BUFFER : kdfInputToBytes(opts.NISTfn);
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const fnLen = leftEncode(_8n * BigInt(fn.length)); // length in bits
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const pers = abytesOrZero(opts.personalization, 'personalization');
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const persLen = leftEncode(_8n * BigInt(pers.length)); // length in bits
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if (!fn.length && !pers.length)
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return h;
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// SP 800-185 cSHAKE appends `00` instead of SHAKE's `1111`; in this Keccak implementation
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// that changes the delimited suffix byte from `0x1f` to `0x04` once N or S is non-empty.
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h.suffix = 0x04;
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h.update(blockLenBytes).update(fnLen).update(fn).update(persLen).update(pers);
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let totalLen = blockLenBytes.length + fnLen.length + fn.length + persLen.length + pers.length;
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h.update(getPadding(totalLen, h.blockLen));
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return h;
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}
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const gencShake = (suffix, blockLen, outputLen) => createHasher((opts = {}) => cshakePers(new Keccak(blockLen, suffix, chooseLen(opts, outputLen), true), opts));
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/**
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* 128-bit NIST cSHAKE XOF.
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* @param msg - message bytes to hash
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* @param opts - Optional output, personalization, and NIST function-name
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* settings. When both `NISTfn` and `personalization` are empty,
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* SP 800-185 defines this as plain SHAKE128. Defaults to 16 output bytes
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* when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a message with cSHAKE128.
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* ```ts
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* cshake128(new Uint8Array([1, 2, 3]), { dkLen: 32 });
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* ```
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*/
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export const cshake128 = /* @__PURE__ */ gencShake(0x1f, 168, 16);
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/**
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* 256-bit NIST cSHAKE XOF.
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* @param msg - message bytes to hash
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* @param opts - Optional output, personalization, and NIST function-name
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* settings. When both `NISTfn` and `personalization` are empty,
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* SP 800-185 defines this as plain SHAKE256. Defaults to 32 output bytes
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* when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a message with cSHAKE256.
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* ```ts
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* cshake256(new Uint8Array([1, 2, 3]), { dkLen: 64 });
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* ```
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*/
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export const cshake256 = /* @__PURE__ */ gencShake(0x1f, 136, 32);
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/**
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* Internal KMAC class.
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* SP 800-185 §8.4.1 still recommends keys at least as long as the target
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* security strength.
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*/
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export class _KMAC extends Keccak {
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constructor(blockLen, outputLen, enableXOF, key, opts = {}) {
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super(blockLen, 0x1f, outputLen, enableXOF);
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// Preload T = bytepad(encode_string("KMAC") || encode_string(S), rate); later updates append
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// newX = bytepad(encode_string(K), rate) || X and `finish()` appends right_encode(L or 0).
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cshakePers(this, {
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NISTfn: 'KMAC',
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personalization: opts.personalization,
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});
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abytes(key, undefined, 'key');
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// 1. newX = bytepad(encode_string(K), rate) || X || right_encode(L),
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// with `rate = this.blockLen`.
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const blockLenBytes = leftEncode(this.blockLen);
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const keyLen = leftEncode(_8n * BigInt(key.length));
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this.update(blockLenBytes).update(keyLen).update(key);
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const totalLen = blockLenBytes.length + keyLen.length + key.length;
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this.update(getPadding(totalLen, this.blockLen));
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}
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finish() {
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// SP 800-185 uses right_encode(L) for fixed-length KMAC and right_encode(0) for KMACXOF.
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// outputLen in bits
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if (!this.finished)
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this.update(rightEncode(this.enableXOF ? 0 : _8n * BigInt(this.outputLen)));
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super.finish();
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}
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_cloneInto(to) {
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// Create new instance without calling constructor since the key
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// is already in state and we don't know it.
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// Force "to" to be instance of KMAC instead of Sha3.
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if (!to) {
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to = Object.create(Object.getPrototypeOf(this), {});
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to.state = this.state.slice();
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to.blockLen = this.blockLen;
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to.state32 = u32(to.state);
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}
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return super._cloneInto(to);
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}
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clone() {
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return this._cloneInto();
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}
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}
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function genKmac(blockLen, outputLen, xof = false) {
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// One-shot XOF wrappers still finalize via `.digest()` because `_KMAC`
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// already bakes the requested output length into the state.
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const kmac = (key, message, opts) => kmac.create(key, opts).update(message).digest();
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kmac.create = (key, opts = {}) => new _KMAC(blockLen, chooseLen(opts, outputLen), xof, key, opts);
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return kmac;
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}
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/**
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* 128-bit Keccak MAC.
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* @param key - MAC key bytes
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* @param message - message bytes to authenticate
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* @param opts - Optional output and personalization settings. Defaults to
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* 16 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Authentication tag bytes.
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* @example
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* Authenticate a message with KMAC128.
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* ```ts
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* kmac128(new Uint8Array([1, 2, 3]), new Uint8Array([4, 5, 6]));
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* ```
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*/
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export const kmac128 = /* @__PURE__ */ genKmac(168, 16);
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/**
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* 256-bit Keccak MAC.
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* @param key - MAC key bytes
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* @param message - message bytes to authenticate
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* @param opts - Optional output and personalization settings. Defaults to
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* 32 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Authentication tag bytes.
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* @example
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* Authenticate a message with KMAC256.
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* ```ts
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* kmac256(new Uint8Array([1, 2, 3]), new Uint8Array([4, 5, 6]));
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* ```
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*/
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export const kmac256 = /* @__PURE__ */ genKmac(136, 32);
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/**
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* 128-bit Keccak-MAC XOF.
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* @param key - MAC key bytes
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* @param message - message bytes to authenticate
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* @param opts - Optional output and personalization settings. Defaults to
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* 16 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Authentication tag bytes.
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* @example
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* Authenticate a message with KMAC128 XOF output.
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* ```ts
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* kmac128xof(new Uint8Array([1, 2, 3]), new Uint8Array([4, 5, 6]), { dkLen: 32 });
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* ```
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*/
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export const kmac128xof = /* @__PURE__ */ genKmac(168, 16, true);
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/**
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* 256-bit Keccak-MAC XOF.
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* @param key - MAC key bytes
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* @param message - message bytes to authenticate
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* @param opts - Optional output and personalization settings. Defaults to
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* 32 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Authentication tag bytes.
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* @example
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* Authenticate a message with KMAC256 XOF output.
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* ```ts
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* kmac256xof(new Uint8Array([1, 2, 3]), new Uint8Array([4, 5, 6]), { dkLen: 64 });
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* ```
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*/
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export const kmac256xof = /* @__PURE__ */ genKmac(136, 32, true);
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/**
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* Internal TupleHash class for byte-array tuple elements.
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* This implementation relies on SP 800-185's byte-oriented encoding form
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* rather than arbitrary bit strings.
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*/
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export class _TupleHash extends Keccak {
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constructor(blockLen, outputLen, enableXOF, opts = {}) {
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super(blockLen, 0x1f, outputLen, enableXOF);
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cshakePers(this, {
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NISTfn: 'TupleHash',
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personalization: opts.personalization,
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});
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// Change update after cshake processed
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this.update = (data) => {
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abytes(data);
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// SP 800-185 encodes each tuple element as
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// encode_string(X[i]) = left_encode(len(X[i])) || X[i].
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super.update(leftEncode(_8n * BigInt(data.length)));
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super.update(data);
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return this;
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};
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}
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finish() {
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// SP 800-185 uses right_encode(L) for fixed-length TupleHash
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// and right_encode(0) for TupleHashXOF.
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if (!this.finished)
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// outputLen in bits
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super.update(rightEncode(this.enableXOF ? 0 : _8n * BigInt(this.outputLen)));
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super.finish();
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}
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_cloneInto(to) {
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to ||= new _TupleHash(this.blockLen, this.outputLen, this.enableXOF);
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return super._cloneInto(to);
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}
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clone() {
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return this._cloneInto();
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}
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}
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function genTuple(blockLen, outputLen, xof = false) {
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// One-shot XOF wrappers still use `.digest()` because `_TupleHash` stores
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// the requested output length in the state itself.
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const tuple = (messages, opts) => {
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const h = tuple.create(opts);
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if (!Array.isArray(messages))
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throw new Error('expected array of messages');
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for (const msg of messages)
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h.update(msg);
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return h.digest();
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};
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tuple.create = (opts = {}) => new _TupleHash(blockLen, chooseLen(opts, outputLen), xof, opts);
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return tuple;
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}
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/**
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* 128-bit TupleHASH. `tuple(['ab', 'cd']) != tuple(['a', 'bcd'])`.
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* @param messages - ordered byte-array tuple
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* @param opts - Optional output and personalization settings. Defaults to
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* 16 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a tuple of byte arrays with TupleHash128.
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* ```ts
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* tuplehash128([new Uint8Array([1]), new Uint8Array([2])]);
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* ```
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*/
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export const tuplehash128 = /* @__PURE__ */ genTuple(168, 16);
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/**
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* 256-bit TupleHASH. `tuple(['ab', 'cd']) != tuple(['a', 'bcd'])`.
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* @param messages - ordered byte-array tuple
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* @param opts - Optional output and personalization settings. Defaults to
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* 32 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a tuple of byte arrays with TupleHash256.
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* ```ts
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* tuplehash256([new Uint8Array([1]), new Uint8Array([2])]);
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* ```
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*/
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export const tuplehash256 = /* @__PURE__ */ genTuple(136, 32);
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/**
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* 128-bit TupleHASH XOF.
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* @param messages - ordered byte-array tuple
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* @param opts - Optional output and personalization settings. Defaults to
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* 16 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a tuple of byte arrays with TupleHash128 XOF output.
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* ```ts
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* tuplehash128xof([new Uint8Array([1]), new Uint8Array([2])], { dkLen: 32 });
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* ```
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*/
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export const tuplehash128xof = /* @__PURE__ */ genTuple(168, 16, true);
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/**
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* 256-bit TupleHASH XOF.
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* @param messages - ordered byte-array tuple
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* @param opts - Optional output and personalization settings. Defaults to
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* 32 output bytes when `dkLen` is omitted. See {@link cShakeOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a tuple of byte arrays with TupleHash256 XOF output.
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* ```ts
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* tuplehash256xof([new Uint8Array([1]), new Uint8Array([2])], { dkLen: 64 });
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* ```
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*/
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export const tuplehash256xof = /* @__PURE__ */ genTuple(136, 32, true);
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/** Internal Parallel Keccak Hash class. */
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export class _ParallelHash extends Keccak {
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leafHash;
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leafCons;
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chunkPos = 0; // Position of current block in chunk
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chunksDone = 0; // How many chunks we already have
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chunkLen;
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constructor(blockLen, outputLen, leafCons, enableXOF, opts = {}) {
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super(blockLen, 0x1f, outputLen, enableXOF);
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cshakePers(this, {
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NISTfn: 'ParallelHash',
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personalization: opts.personalization,
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});
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this.leafCons = leafCons;
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let { blockLen: B = 8 } = opts;
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anumber(B);
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// blockLen=0 makes take=0 in update(), so pos never advances and the hash hangs.
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if (B < 1)
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throw new Error('"blockLen" must be >= 1, got ' + B);
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this.chunkLen = B;
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// SP 800-185 initializes z = left_encode(B); each completed chunk appends
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// one fixed-size cSHAKE leaf digest before finish() adds right_encode(n)
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// and right_encode(L or 0).
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super.update(leftEncode(B));
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// Change update after cshake processed
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this.update = (data) => {
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abytes(data);
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const { chunkLen, leafCons } = this;
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for (let pos = 0, len = data.length; pos < len;) {
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if (this.chunkPos == chunkLen || !this.leafHash) {
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if (this.leafHash) {
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super.update(this.leafHash.digest());
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this.chunksDone++;
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}
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this.leafHash = leafCons();
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this.chunkPos = 0;
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}
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const take = Math.min(chunkLen - this.chunkPos, len - pos);
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this.leafHash.update(data.subarray(pos, pos + take));
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this.chunkPos += take;
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pos += take;
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}
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return this;
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};
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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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if (this.leafHash) {
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super.update(this.leafHash.digest());
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this.chunksDone++;
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}
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// SP 800-185 finishes ParallelHash as
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// z || right_encode(n) || right_encode(L); XOF mode replaces
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// right_encode(L) with right_encode(0).
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super.update(rightEncode(this.chunksDone));
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// outputLen in bits
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super.update(rightEncode(this.enableXOF ? 0 : _8n * BigInt(this.outputLen)));
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super.finish();
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}
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_cloneInto(to) {
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to ||= new _ParallelHash(this.blockLen, this.outputLen, this.leafCons, this.enableXOF);
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to.leafCons = this.leafCons;
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// Reused destinations can carry a stale partial leaf
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// when the source is still on the root sponge.
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if (this.leafHash)
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to.leafHash = this.leafHash._cloneInto(to.leafHash);
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else if (to.leafHash) {
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to.leafHash.destroy();
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to.leafHash = undefined;
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}
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to.chunkPos = this.chunkPos;
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to.chunkLen = this.chunkLen;
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to.chunksDone = this.chunksDone;
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return super._cloneInto(to);
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}
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destroy() {
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super.destroy.call(this);
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if (this.leafHash)
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this.leafHash.destroy();
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}
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clone() {
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return this._cloneInto();
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}
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}
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function genPrl(blockLen, outputLen, leaf, xof = false) {
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const parallel = (message, opts) => parallel.create(opts).update(message).digest();
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parallel.create = (opts = {}) => new _ParallelHash(blockLen, chooseLen(opts, outputLen),
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// SP 800-185 fixes leaf digests at 256 bits for ParallelHash128 and
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// 512 bits for ParallelHash256; only the final cSHAKE output uses the
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// caller-selected dkLen.
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() => leaf.create({ dkLen: 2 * outputLen }), xof, opts);
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parallel.outputLen = outputLen;
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parallel.blockLen = blockLen;
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parallel.canXOF = xof;
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return parallel;
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}
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/**
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* 128-bit ParallelHash. In JS, it is not parallel.
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* @param msg - message bytes to hash
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* @param opts - Optional output, personalization, and chunking settings.
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* Defaults to 16 output bytes when `dkLen` is omitted.
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* See {@link ParallelOpts}.
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* @returns Digest bytes.
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* @example
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* Hash a message with ParallelHash128.
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* ```ts
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* parallelhash128(new Uint8Array([1, 2, 3]));
|
|
* ```
|
|
*/
|
|
export const parallelhash128 = /* @__PURE__ */ genPrl(168, 16, cshake128);
|
|
/**
|
|
* 256-bit ParallelHash. In JS, it is not parallel.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output, personalization, and chunking settings.
|
|
* Defaults to 32 output bytes when `dkLen` is omitted.
|
|
* See {@link ParallelOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with ParallelHash256.
|
|
* ```ts
|
|
* parallelhash256(new Uint8Array([1, 2, 3]));
|
|
* ```
|
|
*/
|
|
export const parallelhash256 = /* @__PURE__ */ genPrl(136, 32, cshake256);
|
|
/**
|
|
* 128-bit ParallelHash XOF. In JS, it is not parallel.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output, personalization, and chunking settings.
|
|
* Defaults to 16 output bytes when `dkLen` is omitted.
|
|
* See {@link ParallelOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with ParallelHash128 XOF output.
|
|
* ```ts
|
|
* parallelhash128xof(new Uint8Array([1, 2, 3]), { dkLen: 32 });
|
|
* ```
|
|
*/
|
|
export const parallelhash128xof = /* @__PURE__ */ genPrl(168, 16, cshake128, true);
|
|
/**
|
|
* 256-bit ParallelHash XOF. In JS, it is not parallel.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output, personalization, and chunking settings.
|
|
* Defaults to 32 output bytes when `dkLen` is omitted.
|
|
* See {@link ParallelOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with ParallelHash256 XOF output.
|
|
* ```ts
|
|
* parallelhash256xof(new Uint8Array([1, 2, 3]), { dkLen: 64 });
|
|
* ```
|
|
*/
|
|
export const parallelhash256xof = /* @__PURE__ */ genPrl(136, 32, cshake256, true);
|
|
const genTurbo = (blockLen, outputLen) => createHasher((opts = {}) => {
|
|
const D = opts.D === undefined ? 0x1f : opts.D;
|
|
// RFC 9861 §2.1 fixes the default `D = 0x1f`; §2.2 defines the 12-round
|
|
// TurboSHAKE family selected here.
|
|
if (!Number.isSafeInteger(D) || D < 0x01 || D > 0x7f)
|
|
throw new Error('"D" (domain separation byte) must be 0x01..0x7f, got: ' + D);
|
|
const dkLen = opts.dkLen === undefined ? outputLen : opts.dkLen;
|
|
// RFC 9861 §§2.1-2.2 define output length L as a positive integer.
|
|
if (dkLen < 1)
|
|
throw new Error('"dkLen" must be >= 1');
|
|
return new Keccak(blockLen, D, dkLen, true, 12);
|
|
});
|
|
/**
|
|
* TurboSHAKE 128-bit: reduced 12-round keccak.
|
|
* Should've been a simple "shake with 12 rounds", but we got a whole new
|
|
* spec about Turbo SHAKE Pro MAX.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output-length and domain-separation settings.
|
|
* RFC 9861 §2.1 defaults `D` to `0x1f`. Defaults to 32 output bytes when
|
|
* `dkLen` is omitted. See {@link TurboshakeOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with TurboSHAKE128.
|
|
* ```ts
|
|
* turboshake128(new Uint8Array([1, 2, 3]), { dkLen: 32 });
|
|
* ```
|
|
*/
|
|
export const turboshake128 = /* @__PURE__ */ genTurbo(168, 32);
|
|
/**
|
|
* TurboSHAKE 256-bit: reduced 12-round keccak.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output-length and domain-separation settings.
|
|
* RFC 9861 §2.1 defaults `D` to `0x1f`. Defaults to 64 output bytes when
|
|
* `dkLen` is omitted. See {@link TurboshakeOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with TurboSHAKE256.
|
|
* ```ts
|
|
* turboshake256(new Uint8Array([1, 2, 3]), { dkLen: 64 });
|
|
* ```
|
|
*/
|
|
export const turboshake256 = /* @__PURE__ */ genTurbo(136, 64);
|
|
// Same as NIST rightEncode, but returns `[0]` for the zero string.
|
|
// Callers still need to keep `x < 256^255` per RFC 9861 §3.3.
|
|
function rightEncodeK12(n) {
|
|
n = BigInt(n);
|
|
const res = [];
|
|
for (; n > 0; n >>= _8n)
|
|
res.unshift(Number(n & _ffn));
|
|
res.push(res.length);
|
|
return Uint8Array.from(res);
|
|
}
|
|
const EMPTY_BUFFER = /* @__PURE__ */ Uint8Array.of();
|
|
/** Internal K12 hash class. */
|
|
export class _KangarooTwelve extends Keccak {
|
|
chunkLen = 8192;
|
|
leafHash;
|
|
leafLen;
|
|
personalization;
|
|
chunkPos = 0; // Position of current block in chunk
|
|
chunksDone = 0; // How many chunks we already have
|
|
constructor(blockLen, leafLen, outputLen, rounds, opts) {
|
|
super(blockLen, 0x07, outputLen, true, rounds);
|
|
// RFC 9861 §3 defines output length L as a positive integer.
|
|
if (outputLen < 1)
|
|
throw new Error('"dkLen" must be >= 1');
|
|
this.leafLen = leafLen;
|
|
this.personalization =
|
|
opts.personalization === undefined
|
|
? EMPTY_BUFFER
|
|
: copyBytes(abytes(opts.personalization, undefined, 'personalization'));
|
|
}
|
|
update(data) {
|
|
abytes(data);
|
|
const { chunkLen, blockLen, leafLen, rounds } = this;
|
|
for (let pos = 0, len = data.length; pos < len;) {
|
|
if (this.chunkPos == chunkLen) {
|
|
if (this.leafHash)
|
|
super.update(this.leafHash.digest());
|
|
else {
|
|
// RFC 9861 §3.2 switches from SingleNode (`07`) to FinalNode (`06`)
|
|
// once S exceeds 8192 bytes and prefixes S_0 with
|
|
// `03 00 00 00 00 00 00 00`.
|
|
this.suffix = 0x06; // Its safe to change suffix here since its used only in digest()
|
|
super.update(Uint8Array.from([3, 0, 0, 0, 0, 0, 0, 0]));
|
|
}
|
|
// Secondary chunks S_1..S_(n-1) become fixed-length
|
|
// CV_i = TurboSHAKE*(S_i, `0B`, 32|64) chaining values.
|
|
this.leafHash = new Keccak(blockLen, 0x0b, leafLen, false, rounds);
|
|
this.chunksDone++;
|
|
this.chunkPos = 0;
|
|
}
|
|
const take = Math.min(chunkLen - this.chunkPos, len - pos);
|
|
const chunk = data.subarray(pos, pos + take);
|
|
if (this.leafHash)
|
|
this.leafHash.update(chunk);
|
|
else
|
|
super.update(chunk);
|
|
this.chunkPos += take;
|
|
pos += take;
|
|
}
|
|
return this;
|
|
}
|
|
finish() {
|
|
if (this.finished)
|
|
return;
|
|
const { personalization } = this;
|
|
// RFC 9861 §3.2 forms S = M || C || length_encode(|C|) before any tree hashing logic.
|
|
this.update(personalization).update(rightEncodeK12(personalization.length));
|
|
// Leaf hash
|
|
if (this.leafHash) {
|
|
// Multi-chunk K12 appends
|
|
// CV_1..CV_(n-1) || length_encode(n-1) || `FF FF`
|
|
// before the final TurboSHAKE call.
|
|
super.update(this.leafHash.digest());
|
|
super.update(rightEncodeK12(this.chunksDone));
|
|
super.update(Uint8Array.from([0xff, 0xff]));
|
|
}
|
|
super.finish.call(this);
|
|
}
|
|
destroy() {
|
|
super.destroy.call(this);
|
|
if (this.leafHash)
|
|
this.leafHash.destroy();
|
|
// Personalization is copied on create/clone, so destroy can wipe it
|
|
// without touching caller input.
|
|
if (this.personalization !== EMPTY_BUFFER)
|
|
clean(this.personalization);
|
|
this.personalization = EMPTY_BUFFER;
|
|
}
|
|
_cloneInto(to) {
|
|
const { blockLen, leafLen, leafHash, outputLen, rounds } = this;
|
|
const personalization = this.personalization === EMPTY_BUFFER ? EMPTY_BUFFER : copyBytes(this.personalization);
|
|
// Personalization is absorbed only during finish(), so clones need the same pending value.
|
|
to ||= new _KangarooTwelve(blockLen, leafLen, outputLen, rounds, {
|
|
personalization,
|
|
});
|
|
super._cloneInto(to);
|
|
// Reused destinations can carry a stale leaf from an older multi-chunk state.
|
|
if (leafHash)
|
|
to.leafHash = leafHash._cloneInto(to.leafHash);
|
|
else if (to.leafHash) {
|
|
to.leafHash.destroy();
|
|
to.leafHash = undefined;
|
|
}
|
|
// Snapshot the pending personalization so clone state does not alias caller-owned input.
|
|
to.personalization = personalization;
|
|
to.leafLen = this.leafLen;
|
|
to.chunkPos = this.chunkPos;
|
|
to.chunksDone = this.chunksDone;
|
|
return to;
|
|
}
|
|
clone() {
|
|
return this._cloneInto();
|
|
}
|
|
}
|
|
/**
|
|
* 128-bit KangarooTwelve (k12): reduced 12-round keccak.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output and personalization settings. Defaults to
|
|
* 32 output bytes when `dkLen` is omitted. See {@link KangarooOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with KangarooTwelve-128.
|
|
* ```ts
|
|
* kt128(new Uint8Array([1, 2, 3]));
|
|
* ```
|
|
*/
|
|
export const kt128 = /* @__PURE__ */ createHasher((opts = {}) => new _KangarooTwelve(168, 32, chooseLen(opts, 32), 12, opts));
|
|
/**
|
|
* 256-bit KangarooTwelve (k12): reduced 12-round keccak.
|
|
* @param msg - message bytes to hash
|
|
* @param opts - Optional output and personalization settings. Defaults to
|
|
* 64 output bytes when `dkLen` is omitted. See {@link KangarooOpts}.
|
|
* @returns Digest bytes.
|
|
* @example
|
|
* Hash a message with KangarooTwelve-256.
|
|
* ```ts
|
|
* kt256(new Uint8Array([1, 2, 3]));
|
|
* ```
|
|
*/
|
|
export const kt256 = /* @__PURE__ */ createHasher((opts = {}) => new _KangarooTwelve(136, 64, chooseLen(opts, 64), 12, opts));
|
|
const genHopMAC = (hash) => (key, message, personalization, dkLen) => {
|
|
const h = hash;
|
|
return h(key, { personalization: h(message, { personalization }), dkLen });
|
|
};
|
|
/**
|
|
* 128-bit KangarooTwelve-based MAC.
|
|
*
|
|
* These untested (there is no test vectors or implementation available). Use at your own risk.
|
|
* HopMAC128(Key, M, C, L) = KT128(Key, KT128(M, C, 32), L)
|
|
* HopMAC256(Key, M, C, L) = KT256(Key, KT256(M, C, 64), L)
|
|
* The inner KangarooTwelve call always uses a fixed 32-byte digest here,
|
|
* regardless of the outer `dkLen`.
|
|
* @param key - MAC key bytes
|
|
* @param message - message bytes to authenticate
|
|
* @param personalization - personalization bytes mixed into the inner hash
|
|
* @param dkLen - optional output length in bytes
|
|
* @returns Authentication tag bytes.
|
|
* @example
|
|
* Authenticate a message with HopMAC128.
|
|
* ```ts
|
|
* HopMAC128(new Uint8Array([1]), new Uint8Array([2]), new Uint8Array([3]), 32);
|
|
* ```
|
|
*/
|
|
export const HopMAC128 = /* @__PURE__ */ genHopMAC(kt128);
|
|
/**
|
|
* 256-bit KangarooTwelve-based MAC.
|
|
* Like `HopMAC128`, there are no test vectors or known independent
|
|
* implementations available for cross-checking.
|
|
* @param key - MAC key bytes
|
|
* @param message - message bytes to authenticate
|
|
* @param personalization - personalization bytes mixed into the inner hash
|
|
* @param dkLen - optional output length in bytes. The inner KangarooTwelve
|
|
* call still uses a fixed 64-byte digest here, regardless of the outer
|
|
* `dkLen`.
|
|
* @returns Authentication tag bytes.
|
|
* @example
|
|
* Authenticate a message with HopMAC256.
|
|
* ```ts
|
|
* HopMAC256(new Uint8Array([1]), new Uint8Array([2]), new Uint8Array([3]), 64);
|
|
* ```
|
|
*/
|
|
export const HopMAC256 = /* @__PURE__ */ genHopMAC(kt256);
|
|
/**
|
|
* More at
|
|
* {@link https://github.com/XKCP/XKCP/tree/master/lib/high/Keccak/PRG}.
|
|
* Accepted capacities must keep `rho = 1598 - capacity` byte-aligned, and
|
|
* `.clean()` later also requires `rate > 801`.
|
|
*/
|
|
export class _KeccakPRG extends Keccak {
|
|
rate;
|
|
constructor(capacity) {
|
|
anumber(capacity);
|
|
const rate = 1600 - capacity;
|
|
const rho = rate - 2;
|
|
// Rho must be full bytes
|
|
if (capacity < 0 || capacity > 1600 - 10 || rho % 8)
|
|
throw new Error('invalid capacity');
|
|
// blockLen = rho in bytes
|
|
super(rho / 8, 0, 0, true);
|
|
this.rate = rate;
|
|
this.posOut = Math.floor((rate + 7) / 8);
|
|
}
|
|
keccak() {
|
|
// Duplex padding
|
|
this.state[this.pos] ^= 0x01;
|
|
this.state[this.blockLen] ^= 0x02; // Rho is full bytes
|
|
super.keccak();
|
|
this.pos = 0;
|
|
this.posOut = 0;
|
|
}
|
|
update(data) {
|
|
super.update(data);
|
|
this.posOut = this.blockLen;
|
|
return this;
|
|
}
|
|
finish() { }
|
|
digestInto(_out) {
|
|
throw new Error('digest is not allowed, use .randomBytes() instead');
|
|
}
|
|
addEntropy(seed) {
|
|
this.update(seed);
|
|
}
|
|
randomBytes(length) {
|
|
return this.xof(length);
|
|
}
|
|
clean() {
|
|
// clean() mutates live sponge state just like randomBytes(),
|
|
// so destroyed instances must reject it.
|
|
aexists(this, false);
|
|
if (this.rate < 1600 / 2 + 1)
|
|
throw new Error('rate is too low to use .forget()');
|
|
this.keccak();
|
|
for (let i = 0; i < this.blockLen; i++)
|
|
this.state[i] = 0;
|
|
this.pos = this.blockLen;
|
|
this.keccak();
|
|
this.posOut = this.blockLen;
|
|
}
|
|
_cloneInto(to) {
|
|
const { rate } = this;
|
|
to ||= new _KeccakPRG(1600 - rate);
|
|
super._cloneInto(to);
|
|
to.rate = rate;
|
|
return to;
|
|
}
|
|
clone() {
|
|
return this._cloneInto();
|
|
}
|
|
}
|
|
/**
|
|
* KeccakPRG: pseudo-random generator based on Keccak.
|
|
* See {@link https://keccak.team/files/CSF-0.1.pdf}.
|
|
* @param capacity - sponge capacity in bits. Accepted values are those that
|
|
* keep `rho = 1598 - capacity` byte-aligned; the default `254` is chosen
|
|
* because it satisfies that duplex layout while leaving a wide byte-aligned
|
|
* rate.
|
|
* @returns PRG instance backed by a Keccak sponge.
|
|
* @example
|
|
* Create a Keccak-based pseudorandom generator and read bytes from it.
|
|
* ```ts
|
|
* const prg = keccakprg(254);
|
|
* prg.randomBytes(8);
|
|
* ```
|
|
*/
|
|
export const keccakprg = (capacity = 254) => new _KeccakPRG(capacity);
|
|
//# sourceMappingURL=sha3-addons.js.map
|