127 lines
4.2 KiB
Markdown
127 lines
4.2 KiB
Markdown
# bls
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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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By default, native bindings will be used if in NodeJS and they are installed. A WASM implementation ("herumi") is used as a fallback in case any error occurs.
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```ts
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import bls from "@chainsafe/bls";
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(async () => {
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// class-based interface
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const secretKey = bls.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 = bls.secretKeyToPublicKey(sk);
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const sig = bls.sign(sk, message);
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console.log("Is valid: ", bls.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 `/herumi` to explicitly import the WASM version
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```ts
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import bls from "@chainsafe/bls/herumi";
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```
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### Native bindings only
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If you are in NodeJS, import from `/blst-native` to explicitly import the native bindings. 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/blst-native";
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```
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### Get implementation at runtime
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If you need to get a bls implementation at runtime, import from `/getImplementation`.
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```ts
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import {getImplementation} from "@chainsafe/bls/getImplementation";
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const bls = await getImplementation("herumi");
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```
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### Switchable singleton
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If you need a singleton that is switchable at runtime (the default behavior in <=v6), import from `/switchable`.
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```ts
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import bls, {init} from "@chainsafe/bls/switchable";
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// here `bls` is uninitialized
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await init("herumi");
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// here `bls` is initialized
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// now other modules can `import bls from "@chainsafe/bls/switchable"` and it will be initialized
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```
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The API is identical for all implementations.
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## Benchmarks
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- `blst`: [src/blst-native](src/blst-native) (node.js-only, bindings to C via node-gyp)
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- `herumi`: [src/herumi](src/herumi) (node.js & browser, wasm)
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- `noble`: [noble-bls12-381](https://github.com/paulmillr/noble-bls12-381) (node.js & browser, pure JS)
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Results are in `ops/sec (x times slower)`, where `x times slower` = times slower than fastest implementation (`blst`).
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| Function - `ops/sec` | `blst` | `herumi` | `noble` |
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| -------------------------------- | :----: | :----------: | :-----------: |
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| `verify` | 326.38 | 47.674 (x7) | 17.906 (x18) |
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| `verifyAggregate` (30) | 453.29 | 51.151 (x9) | 18.372 (x25) |
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| `verifyMultiple` (30) | 34.497 | 3.5233 (x10) | 2.0286 (x17) |
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| `verifyMultipleSignatures` (30) | 26.381 | 3.1633 (x8) | - |
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| `aggregate` (pubkeys, 30) | 15686 | 2898.9 (x5) | 1875.0 (x8) |
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| `aggregate` (sigs, 30) | 6373.4 | 1033.0 (x6) | 526.25 (x12) |
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| `sign` | 925.49 | 108.81 (x9) | 10.246 (x90) |
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\* `blst` and `herumi` performed 100 runs each, `noble` 10 runs.
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Results from CI run https://github.com/ChainSafe/bls/runs/1513710175?check_suite_focus=true#step:12:13
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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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