mirror of
https://github.com/fluencelabs/js-libp2p-crypto
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1974eb92be
BREAKING CHANGE: Callback support has been dropped in favor of async/await. * feat: use async/await This PR changes this module to remove callbacks and use async/await. The API is unchanged aside from the obvious removal of the `callback` parameter. refs https://github.com/ipfs/js-ipfs/issues/1670 * fix: use latest multihashing-async as it is all promises now
127 lines
4.8 KiB
Markdown
127 lines
4.8 KiB
Markdown
# js-libp2p-crypto-secp256k1
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[](http://protocol.ai)
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[](http://libp2p.io/)
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[](http://webchat.freenode.net/?channels=%23libp2p)
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[](https://discuss.libp2p.io)
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[](https://codecov.io/gh/libp2p/js-libp2p-crypto-secp256k1)
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[](https://travis-ci.com/libp2p/js-libp2p-crypto-secp256k1)
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[](https://david-dm.org/libp2p/js-libp2p-crypto-secp256k1)
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[](https://github.com/feross/standard)
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> Support for secp256k1 keys in js-libp2p-crypto
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This repo contains a [js-libp2p-crypto](https://github.com/libp2p/js-libp2p-crypto)-compatible
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implementation of cryptographic signature generation and verification using the
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[secp256k1 elliptic curve](https://en.bitcoin.it/wiki/Secp256k1) popularized by Bitcoin and other
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crypto currencies.
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## Lead Captain
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[Friedel Ziegelmayer](https://github.com/dignifiedquire/)
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## Table of Contents
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- [Install](#install)
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- [Usage](#usage)
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- [Example](#example)
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- [API](#api)
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- [`generateKeyPair([bits])`](#generatekeypairbits)
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- [`unmarshalSecp256k1PublicKey(bytes)`](#unmarshalsecp256k1publickeybytes)
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- [`unmarshalSecp256k1PrivateKey(bytes)`](#unmarshalsecp256k1privatekeybytes)
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- [`Secp256k1PublicKey`](#secp256k1publickey)
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- [`.verify(data, sig)`](#verifydata-sig)
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- [`Secp256k1PrivateKey`](#secp256k1privatekey)
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- [`.public`](#public)
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- [`.sign(data)`](#signdata)
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- [Contribute](#contribute)
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- [License](#license)
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## Install
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```sh
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npm install --save libp2p-crypto-secp256k1
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```
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## Usage
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This module is designed to work with [js-libp2p-crypto](https://github.com/libp2p/js-libp2p-crypto).
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Installing `libp2p-crypto-secp256k1` will automatically add support for the `'secp256k1'` key type, which
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can be used as an argument to the [libp2p-crypto API functions](https://github.com/libp2p/js-libp2p-crypto#api)
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`generateKeyPair`, `unmarshalPublicKey`, and `marshalPrivateKey`. The keys returned from those functions will be
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instances of the `Secp256k1PublicKey` or `Secp256k1PrivateKey` classes provided by this module.
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### Example
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```js
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const crypto = require('libp2p-crypto')
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const msg = Buffer.from('Hello World')
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const key = await crypto.generateKeyPair('secp256k1', 256)
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// assuming no error, key will be an instance of Secp256k1PrivateKey
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// the public key is available as key.public
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const sig = await key.sign(msg)
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const valid = await key.public.verify(msg, sig)
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assert(valid, 'Something went horribly wrong')
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```
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## API
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The functions below are the public API of this module.
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For usage within `libp2p-crypto`, see the [`libp2p-crypto` API documentation](https://github.com/libp2p/js-libp2p-crypto#api).
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### `generateKeyPair([bits])`
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- `bits: Number` - Optional, included for compatibility with js-libp2p-crypto. Ignored if present; private keys will always be 256 bits.
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Returns `Promise<Secp256k1PrivateKey>`
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### `unmarshalSecp256k1PublicKey(bytes)`
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- `bytes: Buffer`
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Converts a serialized secp256k1 public key into an instance of `Secp256k1PublicKey` and returns it
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### `unmarshalSecp256k1PrivateKey(bytes)`
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- `bytes: Buffer`
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Returns `Promise<Secp256k1PrivateKey>`
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Converts a serialized secp256k1 private key into an instance of `Secp256k1PrivateKey`.
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### `Secp256k1PublicKey`
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#### `.verify(data, sig)`
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- `data: Buffer`
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- `sig: Buffer`
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Returns `Promise<Boolean>`
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Calculates the SHA-256 hash of `data`, and verifies the DER-encoded signature in `sig`.
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### `Secp256k1PrivateKey`
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#### `.public`
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Accessor for the `Secp256k1PublicKey` associated with this private key.
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#### `.sign(data)`
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- `data: Buffer`
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Returns `Promise<Buffer>`
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Calculates the SHA-256 hash of `data` and signs it, resolves with the DER-encoded signature.
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## Contribute
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Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/js-libp2p-crypto-secp256k1/issues)!
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This repository falls under the IPFS [Code of Conduct](https://github.com/ipfs/community/blob/master/code-of-conduct.md).
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[](https://github.com/ipfs/community/blob/master/contributing.md)
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## License
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[MIT](LICENSE)
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