# `hmac-blake2b`

> HMAC based on BLAKE2b

Even though BLAKE2b is designed to also work as a MAC, specifications like
[Noise](http://noiseprotocol.org/noise.html#hash-functions-and-hashing) call for
a HMAC.

## Usage

```js
var sodium = require('sodium-universal')
var hmac = require('hmac-blake2b')

var mac = Buffer.alloc(hmac.BYTES)
var key = Buffer.alloc(hmac.KEYBYTES)
sodium.randombytes_buf(key)

var data = Buffer.from('some data')

hmac(mac, data, key)
```

## API

### `hmac.BYTES`

Size of the output MAC in bytes

### `hmac.KEYBYTES`

[RFC2104](https://www.ietf.org/rfc/rfc2104.txt) recommended size of the key in
bytes.

### `hmac(out, data, key)`

Computes a HMAC from `data` with `key` and writes it into `out`.

* `out` must be a `Buffer` or `Uint8Array` of length `hmac.BYTES`
* `data` must be a `Buffer`, `Uint8Array` or `Array` of `Buffer`s or
  `Uint8Array`s.
* `key` must be a `Buffer` or `Uint8Array`. Per the HMAC spec `key` can be as
  small as 1 byte, in which case it is right-padded with `NUL` bytes, or any
  size larger than `hmac.KEYBYTES` in which case it is hashed down to fit. The
  recommended size by the spec is `hmac.KEYBYTES`

## Install

```sh
npm install hmac-blake2b
```

## License

[ISC](LICENSE)


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hmac-blake2b

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hmac-blake2b

`hmac-blake2b`

Usage

API

`hmac.BYTES`

`hmac.KEYBYTES`

`hmac(out, data, key)`

Install

License

Keywords

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hmac-blake2b

Usage

API

hmac.BYTES

hmac.KEYBYTES

hmac(out, data, key)

Install

License

Keywords

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`hmac.BYTES`

`hmac.KEYBYTES`

`hmac(out, data, key)`