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.cargo/config.toml
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[target.wasm32-unknown-unknown]
rustflags = ["-C", "target-feature=+simd128"]
.gitignore
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/target
pkg/
.idea/
Cargo.lock
Generated
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
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Cargo.toml
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[package]
name = "blake3-wasm"
version = "0.0.1"
edition = "2024"
license = "MIT"
repository = "https://github.com/UneBaguette/blake3.wasm"
description = "Simple blake3 to wasm project"
keywords = ["blake3", "wasm", "hash", "cryptography", "wasm-bindgen"]
categories = ["cryptography", "wasm"]
[lib]
crate-type = ["cdylib"]
[dependencies]
blake3 = { version = "1.8.4", features = ["wasm32_simd"] }
wasm-bindgen = "0.2.118"
LICENSE
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MIT License
Copyright (c) 2026 UneBaguette
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
README.md
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# blake3 to wasm
**blake3.wasm** is a WebAssembly port of the BLAKE3 cryptographic hash function written in **Rust**. It enables fast and secure hashing right inside **browsers** and **Node.js**.
## build
```sh
# lets build it!
# For NodeJS
wasm-pack build --target nodejs --release
# For the web!
wasm-pack build --target web --release
```
SIMD is enabled via `wasm32_simd` feature in `Cargo.toml` and requires:
```toml
# .cargo/config.toml
[target.wasm32-unknown-unknown]
rustflags = ["-C", "target-feature=+simd128"]
```
## Usage
```js
import { hash, hashXof, keyedHash, deriveKey, Hasher } from './pkg/blake3_wasm.js'
const data = new TextEncoder().encode('hello world')
const key = new Uint8Array(32).fill(1)
// One-shot hashing
hash(data)
hashXof(data, 64) // variable output length
// MAC and key derivation
keyedHash(data, key)
deriveKey('my context', key)
// Streaming
const h = new Hasher()
h.update(data.slice(0, 5))
h.update(data.slice(5))
h.finalize()
```
## Benchmarks
Tested on **Ryzen 7 5800X**, Node.js v24.
| Size | @noble/hashes | awasm-noble | blake3-wasm |
|-------|---------------|-------------|-------------|
| 32 B | 11 MB/s | 34 MB/s | 81 MB/s |
| 1 KB | 60 MB/s | 360 MB/s | 781 MB/s |
| 64 KB | 49 MB/s | 1,518 MB/s | 2,004 MB/s |
| 1 MB | 51 MB/s | 1,671 MB/s | 1,893 MB/s |
| 10 MB | 51 MB/s | 1,572 MB/s | 1,812 MB/s |
## See also
- [@noble/hashes](https://github.com/paulmillr/noble-hashes) | pure JS implementation
- [awasm-noble](https://github.com/paulmillr/awasm-noble) | auditable WASM implementation
- [blake3-napi](https://github.com/UneBaguette/blake3-napi) | native Node.js addon, faster for large inputs
src/lib.rs
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use wasm_bindgen::prelude::*;
#[wasm_bindgen]
pub fn hash(value: &[u8]) -> Vec<u8> {
blake3::hash(value).as_bytes().to_vec()
}
#[wasm_bindgen]
pub fn hash_xof(data: &[u8], out_len: usize) -> Vec<u8> {
let mut out = vec![0u8; out_len];
let mut reader = blake3::Hasher::new().update(data).finalize_xof();
reader.fill(&mut out);
out
}
#[wasm_bindgen]
pub fn keyed_hash(data: &[u8], key: &[u8]) -> Result<Vec<u8>, JsError> {
let key: &[u8; 32] = key
.try_into()
.map_err(|_| JsError::new("key must be exactly 32 bytes"))?;
Ok(blake3::keyed_hash(key, data).as_bytes().to_vec())
}
#[wasm_bindgen]
pub fn derive_key(context: &str, key_material: &[u8]) -> Vec<u8> {
blake3::derive_key(context, key_material).to_vec()
}
#[wasm_bindgen]
pub struct Hasher(blake3::Hasher);
#[wasm_bindgen]
impl Hasher {
#[wasm_bindgen(constructor)]
pub fn new() -> Self {
Hasher(blake3::Hasher::new())
}
pub fn new_keyed(key: &[u8]) -> Result<Hasher, JsError> {
let key: &[u8; 32] = key
.try_into()
.map_err(|_| JsError::new("key must be exactly 32 bytes"))?;
Ok(Hasher(blake3::Hasher::new_keyed(key)))
}
pub fn update(&mut self, data: &[u8]) {
self.0.update(data);
}
pub fn finalize(&self) -> Vec<u8> {
self.0.finalize().as_bytes().to_vec()
}
pub fn finalize_xof(&self, out_len: usize) -> Vec<u8> {
let mut out = vec![0u8; out_len];
self.0.finalize_xof().fill(&mut out);
out
}
pub fn reset(&mut self) {
self.0.reset();
}
}