> For the complete documentation index, see [llms.txt](https://docs.twine.world/twine-js/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.twine.world/twine-js/twine-protocol/twine-builder/classes/josesigner.md).

# JoseSigner

[**@twine-protocol/twine-builder v0.1.0**](/twine-js/twine-protocol/twine-builder/index.md) • **Docs**

***

[twine-js](/twine-js/index.md) / [@twine-protocol/twine-builder](/twine-js/twine-protocol/twine-builder/index.md) / JoseSigner

## Class: JoseSigner

A signer that uses the jose library to sign twines

### Example

```js
import { JoseSigner } from '@twine-protocol/twine-builder'
const signer = await JoseSigner.fromRandomness()
```

### Implements

* `Signer`

### Constructors

#### new JoseSigner()

> **new JoseSigner**(`privateKey`, `publicKey`, `alg`): [`JoseSigner`](/twine-js/twine-protocol/twine-builder/classes/josesigner.md)

Create a new JoseSigner from a JWK

**Parameters**

| Parameter    | Type      | Description          |
| ------------ | --------- | -------------------- |
| `privateKey` | `KeyLike` | The private key      |
| `publicKey`  | `KeyLike` | The public key       |
| `alg`        | `string`  | The algorithm to use |

**Returns**

[`JoseSigner`](/twine-js/twine-protocol/twine-builder/classes/josesigner.md)

**Defined in**

[jose-signer.ts:46](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L46)

### Properties

| Property     | Type      | Description | Defined in                                                                                                                                                  |
| ------------ | --------- | ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `privateKey` | `KeyLike` | Private Key | [jose-signer.ts:19](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L19) |
| `publicKey`  | `KeyLike` | Public Key  | [jose-signer.ts:21](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L21) |
| `algorithm`  | `string`  | Algorithm   | [jose-signer.ts:23](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L23) |

### Methods

#### fromRandomness()

> `static` **fromRandomness**(`alg`, `options`): `Promise`<[`JoseSigner`](/twine-js/twine-protocol/twine-builder/classes/josesigner.md)>

Create a new JoseSigner from a random key pair

**Parameters**

| Parameter | Type                     | Default value | Description              |
| --------- | ------------------------ | ------------- | ------------------------ |
| `alg`     | `string`                 | `'ES256'`     | The algorithm to use     |
| `options` | `GenerateKeyPairOptions` | `{}`          | Options for the key pair |

**Returns**

`Promise`<[`JoseSigner`](/twine-js/twine-protocol/twine-builder/classes/josesigner.md)>

**See**

<https://github.com/panva/jose/blob/main/src/runtime/node/generate.ts#L42>

**Defined in**

[jose-signer.ts:34](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L34)

***

#### getPublicJWK()

> **getPublicJWK**(): `Promise`<[`JWK`](/twine-js/twine-protocol/twine-core/interfaces/jwk.md)>

Get the public JWK

**Returns**

`Promise`<[`JWK`](/twine-js/twine-protocol/twine-core/interfaces/jwk.md)>

**See**

[Signer.getPublicJWK](https://github.com/twine-protocol/twine-js/blob/master/packages/twine-core/docs/interfaces/Signer.md#getpublicjwk)

**Implementation of**

`Signer.getPublicJWK`

**Defined in**

[jose-signer.ts:62](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L62)

***

#### sign()

> **sign**(`bytes`): `Promise`<`string`>

Sign some bytes

**Parameters**

| Parameter | Type         |
| --------- | ------------ |
| `bytes`   | `Uint8Array` |

**Returns**

`Promise`<`string`>

**See**

[Signer.sign](https://github.com/twine-protocol/twine-js/blob/master/packages/twine-core/docs/interfaces/Signer.md#sign)

**Implementation of**

`Signer.sign`

**Defined in**

[jose-signer.ts:72](https://github.com/twine-protocol/twine-js/blob/3800995f9c83f4f5711bcf3062ea754a1e4448ce/packages/twine-builder/src/jose-signer.ts#L72)