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The sign() operation generates a digital signature of the provided data, using the given CryptoKey object.


sign(algorithm, key, data)


algorithmstring or object with a single name string propertyThe signature algorithm to use. Currently supported: HMAC.
keyCryptoKeyThe key to use for signing.
dataArrayBuffer, TypedArray, or DataViewThe data to be signed.

Return Value

A Promise that resolves with the signature as an ArrayBuffer.


InvalidAccessErrorRaised when the signing key either does not support signing operation, or is incompatible with the selected algorithm.


import { crypto } from "k6/experimental/webcrypto";
export default async function () {
const generatedKey = await crypto.subtle.generateKey(
name: "HMAC",
hash: { name: "SHA-1" },
const data = string2ArrayBuffer("Hello World");
* Signes the encoded data with the provided key using the HMAC algorithm
* the returned signature can be verified using the verify method.
const signature = await crypto.subtle.sign("HMAC", generatedKey, data);
* Verifies the signature of the encoded data with the provided key using the HMAC algorithm.
const verified = await crypto.subtle.verify("HMAC", generatedKey, signature, data);
console.log("verified: ", verified)
function string2ArrayBuffer(str) {
const buf = new ArrayBuffer(str.length * 2); // 2 bytes for each char
const bufView = new Uint16Array(buf);
for (let i = 0, strLen = str.length; i < strLen; i++) {
bufView[i] = str.charCodeAt(i);
return buf;