sha1.wasm

WebAssembly port of SHA-1

npm i @hazae41/sha1.wasm

Node Package 📦

Features

• Reproducible building
• Pre-bundled and streamed
• Zero-copy memory slices

Modules

• sha1

Algorithms

• SHA-1 (direct and incremental)

Usage

Direct

import { Sha1Wasm, Memory, sha1 } from "@hazae41/sha1.wasm";

// Wait for WASM to load
await Sha1Wasm.initBundled();

// Data to be hashed
const hello = new TextEncoder().encode("Hello World")

// Pass to WASM
using memory = new Memory(hello)

// Grab the digest
using digest = sha1(memory)

console.log(digest.bytes) // Uint8Array

Incremental

import { Sha1Wasm, Memory, Sha1Hasher } from "@hazae41/sha1.wasm";

// Wait for WASM to load
await Sha1Wasm.initBundled();

// Create a hash
using hasher = new Sha1Hasher()

// Data to be hashed
const hello = new TextEncoder().encode("Hello World")

// Pass to WASM
using memory = new Memory(hello)

// Update the hash with your data
hasher.update(memory)

// Grab the digest
using digest = hasher.finalize()

// Update the hash another time
hasher.update(memory)

// Grab the digest
using digest2 = hasher.finalize()

// digest !== digest2
console.log(digest.bytes)
console.log(digest2.bytes)

Building

Unreproducible building

You need to install Rust

Then, install wasm-pack

cargo install wasm-pack

Finally, do a clean install and build

npm ci && npm run build

Reproducible building

You can build the exact same bytecode using Docker, just be sure you're on a linux/amd64 host

docker compose up --build

Then check that all the files are the same using git status

git status --porcelain

If the output is empty then the bytecode is the same as the one I commited

Automated checks

Each time I commit to the repository, the GitHub's CI does the following:

• Clone the repository
• Reproduce the build using docker compose up --build
• Throw an error if the git status --porcelain output is not empty

Each time I release a new version tag on GitHub, the GitHub's CI does the following:

• Clone the repository
• Do not reproduce the build, as it's already checked by the task above
• Throw an error if there is a npm diff between the cloned repository and the same version tag on NPM

If a version is present on NPM but not on GitHub, do not use!