sodium-hmac

HMAC utility

Usage

``js
const { HMAC, sha256 } = require('sodium-hmac')

const hmac = new HMAC(sha256)

hmac.init(Buffer.from('key'))
.update(Buffer.from('some'))
.update(Buffer.from('more'))
.update(Buffer.from('data'))

const output = hmac.final()

// or use simple api
const same = HMAC.sha256(b4a.from('somemoredata'), key)
`

API

#### const hmac = new HMAC(hash, [key])

Returns a HMAC object using the given hash function. If key is provided, init will be called in the constructror

Expects hash to be an object with:
- init
- update
- final
- BYTES
- STATEBYTES

sha256 and sha512 are exported by default.

Returned API:
- init
- update
- final
- simple
- BYTES
- STATEBYTES

Example usage:
`js
const blake2b = {
init: sodium.crypto_generichash_init,
update: sodium.crypto_generichash_update,
final: sodium.crypto_generichash_final,
BYTES: sodium.crypto_generichash_BYTES,
STATEBYTES: sodium.crypto_generichash_STATEBYTES
}

const hmac = new HMAC(blake2b)
`

$3

Hash data into the HMAC. hmac.init() must be called prior to updating

$3

Finlise the HMAC. The result will be written to buffer if present

$3

Produce an HMAC-SHA256 over data with key

$3

Produce an HMAC-SHA512 over data with key`

$3

Exports an HMAC-compatible SHA256 API.

$3

Exports an HMAC-compatible SHA512 API.

License

Apache-2.0