hmac-blake2b

HMAC based on BLAKE2b

Even though BLAKE2b is designed to also work as a MAC, specifications like Noise call for a HMAC.

Usage

const { randombytes_buf } = require('sodium-universal/randombytes')
const hmac = require('.')

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

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

hmac(mac, data, key)

API

hmac.BYTES

Size of the output MAC in bytes

hmac.KEYBYTES

RFC2104 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 Buffers or
  Uint8Arrays.
• 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

npm install hmac-blake2b

License

ISC