@huggingface/blake3-jit

@huggingface/blake3-jit

Temporary fork of blake3-jit with performance patches for @huggingface/xetchunk-wasm.

This package will be deprecated once the upstream blake3-jit package exposes the reset() method and pre-allocated internal buffers.

Changes from upstream blake3-jit@1.0.0

• Hasher.reset() — Resets the hasher to process a new message with the same key/flags, reusing all internal buffers (zero allocations). This avoids creating a new Hasher per chunk in hot loops.

• Pre-allocated internal buffers — parentBlock, parentCv, chunkCv, outWords, and finalizeCv are allocated once in the constructor instead of per-call in addChunkCv, update, finalize, and finalizeOutput.

• Removed Uint32Array view construction in ChunkState.update — The byte-by-byte readLittleEndianWordsFull path is faster than creating a Uint32Array view (avoids TypedArray constructor overhead) and also fixes a crash on unaligned subarrays.

Patch file

The changes are also available as a pnpm patch at packages/xetchunk-wasm/patches/blake3-jit.patch in the huggingface.js monorepo.

Usage

import { Hasher } from '@huggingface/blake3-jit';

const key = new Uint8Array(32);
const hasher = Hasher.newKeyed(key);

// Hash multiple messages without reallocating
const hash1 = hasher.update(data1).finalize(32);
const hash2 = hasher.reset().update(data2).finalize(32);
const hash3 = hasher.reset().update(data3).finalize(32);