Paimon

WebAssembly port of RSA encryption and signatures

npm i @hazae41/paimon

Node Package 📦 • Deno Module 🦖 • Next.js CodeSandbox 🪣

Algorithms

• RSA from RustCrypto (rsa)

Features

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

Usage

import { Paimon, RsaPrivateKey } from "@hazae41/paimon";

// Wait for WASM to load
await Paimon.initBundledOnce()

// Generate an identity
const keypair = new RsaPrivateKey(1024)
const identity = keypair.to_public_key()

// Define bytes to sign and padding to use
const bytes = new TextEncoder().encode("hello world")

// Sign and verify
const proof = keypair.sign_pkcs1v15_raw(bytes).copyAndDispose()
const verified = identity.verify_pkcs1v15_raw(bytes, proof)

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!