hkdf

HKDF with no dependencies using runtime's native crypto

HKDF is a simple key derivation function defined in RFC 5869.

Documentation

▸ hkdf(digest, ikm, salt, info, keylen): Promise<Uint8Array>

The given ikm, salt and info are used with the digest to derive a key of keylen bytes.

Parameters

Name	Type	Description
digest	"sha256" | "sha384" | "sha512" | "sha1"	The digest algorithm to use.
ikm	Uint8Array | string	The input keying material. It must be at least one byte in length.
salt	Uint8Array | string	The salt value. Must be provided but can be zero-length.
info	Uint8Array | string	Additional info value. Must be provided but can be zero-length, and cannot be more than 1024 bytes.
keylen	number	The length in bytes of the key to generate. Must be greater than 0 and no more than 255 times the digest size.

Returns

Promise<Uint8Array>

Example

example ESM import

1import hkdf from '@panva/hkdf'

example CJS import

1const { hkdf } = require('@panva/hkdf')

example Deno import

1import hkdf from 'https://deno.land/x/hkdf/index.ts'

example Usage

1const derivedKey = await hkdf(
2  'sha256',
3  'key',
4  'salt',
5  'info',
6  64
7)

Supported Runtimes

The supported JavaScript runtimes include ones that

• are reasonably up to date ECMAScript
• support the utilized Web API globals and standard built-in objects
• These are
  • (This is not an exhaustive list)
  • Browsers
  • Cloudflare Workers
  • Deno
  • Electron
  • Netlify Edge Functions
  • Next.js Middlewares
  • Node.js
  • Vercel Edge Functions