# 4us-dev crypto

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Install with [npm](https://www.npmjs.com/)

```sh
npm i @4us-dev/crypto
```

### Introduction

`@4us-dev/crypto` is a lib to help developers with encryption and encoding.

## Usage

- [Base64](#base64)
  - [encode](#encode)
  - [decode](#decode)
- [Base64Url](#base64url)
  - [encode](#encode)
  - [decode](#decode)
- [sha256](#sha256)
  - [Defining output encode](#defining-output-encode)
- [sha256Async](#sha256Async)
- [PKCE](#pkce)
  - [codeVerifierGenerator](#codeverifiergenerator)
  - [codeChallengeGenerator](#codechallengegenerator)

### Base64

```js
import { base64 } from '@4us-dev/crypto';
```

#### encode

```js
base64.encode('teste+encode+');
// output
// dGVzdGUrZW5jb2RlKw==
```

#### decode

```js
base64.decode('dGVzdGUrZW5jb2RlKw==');
// output
// teste+encode+
```

### Base64Url

```js
import { base64Url } from '@4us-dev/crypto';
```

#### encode

```js
base64Url.encode('teste+encode+');
// output
// dGVzdGUrZW5jb2RlKw
```

#### decode

```js
base64Url.decode('dGVzdGUrZW5jb2RlKw');
// output
// teste+encode+
```

### sha256

```js
import { sha256 } from '@4us-dev/crypto';
```

default encoding is `hex`

```js
sha256('4us dev');
// output
// 9c8813f0ca966480ebd17668f7850c85930e9a5e2425a71d9b1125c9026edf3d
```

#### defining output encode

```js
sha256('4us dev', 'base64');
// output
// nIgT8MqWZIDr0XZo94UMhZMOml4kJacdmxElyQJu3z0=
```

### sha256Async

```js
import { sha256Async } from '@4us-dev/crypto';
```

```js
const output = await sha256Async('4us dev');

// or

sha256Async('4us dev').then((output) => console.log(output));

// output
// 9c8813f0ca966480ebd17668f7850c85930e9a5e2425a71d9b1125c9026edf3d
```

### PKCE

Generate `code verifier` and `code challenge` for OAuth with PKCE.

```js
import { pkce } from '@4us-dev/crypto';
```

#### codeVerifierGenerator

```js
const codeVerifier = pkce.codeVerifierGenerator();
// output example
// FVMq~J2BfdXm2cEOEtlKQTGNRjYQ8VYA6OETFrW3A915~8dbktXkSwtVbZnUUStkApwZjcIWCYV.OiITpYNXpuWGBEM1.oFxT7ZizzoQ0OE81ZAOIU1JCwXMxmCQtyL2
```

#### codeChallengeGenerator

```js
// this works only with nodejs
const output = pkce.codeChallengeGenerator(codeVerifier);
// output example
// Ae8fgMraIhwQDPladfacB-s6Oh4Hzs34SXLQmiyci98
```

#### codeChallengeGeneratorAsync

```js
// this works with browser and node
const output = await pkce.codeChallengeGeneratorAsync(codeVerifier);
// output example
// Ae8fgMraIhwQDPladfacB-s6Oh4Hzs34SXLQmiyci98
```