Javascript library for BLS (Boneh-Lynn-Shacham) signatures and signature aggregation, tailored for use in Eth2.

yarn add @chainsafe/bls

To use native bindings you must install peer dependency @chainsafe/blst

yarn add @chainsafe/bls @chainsafe/blst

You must initialize the library once in your application before using it. The result is cached and use across all your imports

import {init, SecretKey, secretKeyToPublicKey, sign, verify} from "@chainsafe/bls";

(async () => {
  await init("herumi");

  // class-based interface
  const secretKey = SecretKey.fromKeygen();
  const publicKey = secretKey.toPublicKey();
  const message = new Uint8Array(32);

  const signature = secretKey.sign(message);
  console.log("Is valid: ", signature.verify(publicKey, message));

  // functional interface
  const sk = secretKey.toBytes();
  const pk = secretKeyToPublicKey(sk);
  const sig = sign(sk, message);
  console.log("Is valid: ", verify(pk, message, sig));
})();

If you are in the browser, import from /browser to import directly the WASM version

import bls from "@chainsafe/bls/browser";

If you are in NodeJS, import from /node to skip browser specific code. Also install peer dependency @chainsafe/blst which has the native bindings

yarn add @chainsafe/bls @chainsafe/blst

import bls from "@chainsafe/bls/node";

If you want to offer a fallback in NodeJS, first try to load native bindings and then fallback to WASM. Also install peer dependency @chainsafe/blst which has the native bindings

yarn add @chainsafe/bls @chainsafe/blst

import {init} from "@chainsafe/bls";

try {
  await init("blst-native");
} catch (e) {
  await init("herumi");
  console.warn("Using WASM");
}

The API is identical for all implementations.

• blst: src/blst (node.js-only, bindings to C via node-gyp)
• herumi: src/herumi (node.js & browser, wasm)
• noble: noble-bls12-381 (node.js & browser, pure JS)

Results are in ops/sec (x times slower), where x times slower = times slower than fastest implementation (blst).

*noble methods include serialization and deserialization to bytes, which may impact all benchmarks specially aggregate. ** blst and herumi performed 100 runs each, noble 10 runs.

Results from CI run https://github.com/ChainSafe/bls/runs/1488856560?check_suite_focus=true#step:12:13

spec

test vectors

Apache-2.0