# @transmute/did-key-secp256k1

> ``` npm i @transmute/did-key-secp256k1@latest --save ```

Latest version **0.3.0-unstable.10** (published 2022-12-12) · Apache-2.0 license · 0 weekly downloads

## Install

```sh
npm install @transmute/did-key-secp256k1
pnpm add @transmute/did-key-secp256k1
yarn add @transmute/did-key-secp256k1
bun add @transmute/did-key-secp256k1
```

## Health

**Score 30/100 (F)** — status: abandoned.

Positive: has types; esm support; no vulnerabilities; high quality score.

Warnings: low downloads; pre 1.0.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 0.3.0-unstable.10 |
| Published | 2022-12-12 |
| First published | 2020-06-13 |
| Weekly downloads | 0 |
| License | Apache-2.0 |
| TypeScript types | bundled |
| Module format | ESM + CommonJS |
| Node | >=14 |
| Dependencies | 2 |
| Unpacked size | 39.9 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 57 |
| Author | Orie Steele |
| Maintainers | or13, transmute-ci |

## Links

- npm: https://www.npmjs.com/package/@transmute/did-key-secp256k1
- Repository: https://github.com/transmute-industries/did-key.js
- Homepage: https://github.com/transmute-industries/did-key.js/tree/main/packages/did-key-secp256k1
- Issues: https://github.com/transmute-industries/did-key.js/issues
- npm.io page: https://npm.io/package/@transmute/did-key-secp256k1

## Dependencies (2)

- [@transmute/did-key-common](https://npm.io/package/@transmute/did-key-common.md) ^0.3.0-unstable.10
- [@transmute/secp256k1-key-pair](https://npm.io/package/@transmute/secp256k1-key-pair.md) ^0.7.0-unstable.2

## Recent versions

- 0.3.0-unstable.10 (latest) — 2022-12-12
- 0.0.1-alpha.32 (canary) — 2020-06-14
- 0.3.0-unstable.9 — 2022-08-06
- 0.3.0-unstable.8 — 2022-03-21
- 0.3.0-unstable.7 — 2022-03-18
- 0.3.0-unstable.6 — 2022-03-18
- 0.3.0-unstable.5 — 2021-11-23
- 0.3.0-unstable.4 — 2021-07-12
- 0.3.0-unstable.3 — 2021-07-11
- 0.3.0-unstable.2 — 2021-07-06
- 0.3.0-unstable.1 — 2021-07-05
- 0.3.0-unstable.0 — 2021-07-05
- 0.2.1-unstable.42 — 2021-04-19
- 0.2.1-unstable.41 — 2021-04-16
- 0.2.1-unstable.40 — 2021-04-15
- … 43 more at https://npm.io/package/@transmute/did-key-secp256k1/versions

## README

# did-key-secp256k1

```
npm i @transmute/did-key-secp256k1@latest --save
```

## Usage

### Generate

```ts
import crypto from 'crypto';
import * as secp256k1 from '@transmute/did-key-secp256k1';
const { didDocument, keys } = await secp256k1.generate(
  {
    secureRandom: () => {
      return crypto.randomBytes(32);
    },
  },
  { accept: 'application/did+json' }
);
```

### Export

```ts
import { Secp256k1KeyPair } from '@transmute/did-key-secp256k1';
const k = await Secp256k1KeyPair.generate({
  secureRandom: () => {
    return Buffer.from(
      '9085d2bef69286a6cbb51623c8fa258629945cd55ca705cc4e66700396894e0c',
      'hex'
    );
  },
});
const exportedKeyPair = await k.export({
  type: 'JsonWebKey2020',
  privateKey: true,
});
```

### Resolve

```ts
import * as secp256k1 from '@transmute/did-key-secp256k1';
const {
  didDocument,
} = await secp256k1.resolve(
  'did:key:z6LScNhBGJJHGPgx9AMCHjxFew9qfbAZhsi1KyJYcfdcFQ9k',
  { accept: 'application/did+json' }
);
```

#### JsonWebSignature2020

This suite was created after `https://www.w3.org/2018/credentials/v1` so it must be added to the credential context.

```ts
import { ld as vcjs } from '@transmute/vc.js';
import { Secp256k1KeyPair } from '@transmute/did-key-secp256k1';
import { JsonWebSignature, JsonWebKey } from '@transmute/json-web-signature';

const k = await Secp256k1KeyPair.generate({
  secureRandom: () => {
    return Buffer.from(
      '4e61bc1918ea6a47ae3307331be7798196a1a8e7cfe4b6e8f7c9a5f36017d929',
      'hex'
    );
  },
});

const suite = new JsonWebSignature({
  key: await JsonWebKey.from(
    await k.export({
      type: 'JsonWebSignature2020',
      privateKey: true,
    })
  ),
  date: '2020-03-10T04:24:12Z',
});

const vc = await vcjs.issue({
  credential: {
    '@context': [
      'https://www.w3.org/2018/credentials/v1',
      // 🧙‍♂️ This extension context is required.
      'https://w3id.org/security/suites/jws-2020/v1',
    ],
    id: 'http://example.gov/credentials/3732',
    type: ['VerifiableCredential'],
    issuer: {
      id: k.controller,
    },
    issuanceDate: '2020-03-10T04:24:12.164Z',
    credentialSubject: {
      id: 'did:example:ebfeb1f712ebc6f1c276e12ec21',
    },
  },
  suite,
  documentLoader,
});
```

### JOSE

#### ECDSA

```ts
import { Secp256k1KeyPair } from '@transmute/did-key-secp256k1';
import { JWS } from '@transmute/jose-ld';

const k = await Secp256k1KeyPair.generate({
  secureRandom: () => {
    return Buffer.from(
      '4e61bc1918ea6a47ae3307331be7798196a1a8e7cfe4b6e8f7c9a5f36017d929',
      'hex'
    );
  },
});
const JWA_ALG = 'ES256K';
const signer = JWS.createSigner(k.signer('Ecdsa'), JWA_ALG);
const verifier = JWS.createVerifier(k.verifier('Ecdsa'), JWA_ALG);
const message = Uint8Array.from(Buffer.from('hello'));
const signature = await signer.sign({ data: message });
const verified = await verifier.verify({
  signature,
});
```

#### ECDH-ES+A256KW

```ts
import { Secp256k1KeyPair } from '@transmute/did-key-secp256k1';
import { JWE } from '@transmute/jose-ld';

const k = await Secp256k1KeyPair.generate({
  secureRandom: () => {
    return Buffer.from(
      '9085d2bef69286a6cbb51623c8fa258629945cd55ca705cc4e66700396894e0c',
      'hex'
    );
  },
});
const cipher = new JWE.Cipher(Secp256k1KeyPair);
const document = { key1: 'value1', key2: 'value2' };
const recipients = [
  {
    header: {
      kid: k.id,
      alg: 'ECDH-ES+A256KW',
    },
  },
];
const jwe = await cipher.encryptObject({
  obj: document,
  recipients,
  publicKeyResolver: async (id: string) => {
    if (id === k.id) {
      return k.export({ type: 'JsonWebKey2020' });
    }
    throw new Error(
      'publicKeyResolver does not suppport IRI ' + JSON.stringify(id)
    );
  },
});
const plaintext = await cipher.decrypt({ jwe, keyAgreementKey: k });
console.log(JSON.parse(Buffer.from(plaintext).toString('utf-8')));
```

## Representations

#### application/did+json

See [application/did+json](./src/__tests__/generate/__fixtures__/doc-0.json)

#### application/did+ld+json

See [application/did+ld+json](./src/__tests__/generate/__fixtures__/doc-0.ld.json)

---
_Source: https://npm.io/package/@transmute/did-key-secp256k1 · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._