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createHMAC( algorithm, secret )

Creates a HMAC hashing object that can then be fed with data repeatedly, and from which you can extract a signed hash digest whenever you want.

Parameter Type Description
algorithm string The hashing algorithm to use. One of md4, md5, sha1, sha256, sha384, sha512, sha512_224, sha512_256 or ripemd160.
secret string A shared secret used to sign the data.


Type Description
object A Hasher object.


import crypto from 'k6/crypto';

export default function() {
  console.log(crypto.hmac('sha256', 'a secret', 'my data', 'hex'));
  let hasher = crypto.createHMAC('sha256', 'a secret');
  hasher.update('my ');

The above script should result in the following being printed during execution:

INFO[0000] 82f669c8fde13aef6d6977257588dc4953dfac505428f8fd6b52e19cd96d7ea5
INFO[0000] 82f669c8fde13aef6d6977257588dc4953dfac505428f8fd6b52e19cd96d7ea5