104 lines
2.8 KiB
Markdown
104 lines
2.8 KiB
Markdown
# bls
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[](https://travis-ci.org/ChainSafe/lodestar)
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[](https://codecov.io/gh/ChainSafe/lodestar)
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Javascript library for BLS (Boneh-Lynn-Shacham) signatures and signature aggregation, tailored for use in Eth2.
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## Usage
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```bash
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yarn add @chainsafe/bls
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```
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To use native bindings you must install peer dependency `@chainsafe/blst`
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```bash
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yarn add @chainsafe/bls @chainsafe/blst
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```
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You must initialize the library once in your application before using it. The result is cached and use across all your imports
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```ts
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import {init, SecretKey, secretKeyToPublicKey, sign, verify} from "@chainsafe/bls";
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(async () => {
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await init("herumi");
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// class-based interface
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const secretKey = SecretKey.fromKeygen();
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const publicKey = secretKey.toPublicKey();
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const message = new Uint8Array(32);
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const signature = secretKey.sign(message);
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console.log("Is valid: ", signature.verify(publicKey, message));
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// functional interface
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const sk = secretKey.toBytes();
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const pk = secretKeyToPublicKey(sk);
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const sig = sign(sk, message);
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console.log("Is valid: ", verify(pk, message, sig));
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})();
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```
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### Browser
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If you are in the browser, import from `/browser` to import directly the WASM version
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```ts
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import bls from "@chainsafe/bls/browser";
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```
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### Native bindings only
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If you are in NodeJS, import from `/node` to skip browser specific code. Also install peer dependency `@chainsafe/blst` which has the native bindings
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```bash
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yarn add @chainsafe/bls @chainsafe/blst
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```
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```ts
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import bls from "@chainsafe/bls/node";
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```
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### Native bindings + WASM fallback
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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
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```bash
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yarn add @chainsafe/bls @chainsafe/blst
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```
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```ts
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import {init} from "@chainsafe/bls";
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try {
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await init("blst-native");
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} catch (e) {
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await init("herumi");
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console.warn("Using WASM");
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}
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```
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The API is identical for all implementations.
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## Spec versioning
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| Version | Bls spec hash-to-curve version |
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| ------- | :--------------: |
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| 5.x.x | draft #9 |
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| 2.x.x | draft #7 |
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| 1.x.x | draft #6 |
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| 0.3.x | initial version |
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> [spec](https://github.com/ethereum/eth2.0-specs/blob/v1.0.0/specs/phase0/beacon-chain.md#bls-signatures)
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> [test vectors](https://github.com/ethereum/eth2.0-spec-tests/tree/master/tests/bls)
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## License
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Apache-2.0
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