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sign
The sign() operation generates a digital signature of the provided data, using the given CryptoKey object.
Usage
sign(algorithm, key, data)Parameters
| Name | Type | Description |
|---|---|---|
algorithm | string or object with a single name string property | The signature algorithm to use. Currently supported: HMAC. |
key | CryptoKey | The key to use for signing. |
data | ArrayBuffer, TypedArray, or DataView | The data to be signed. |
Return Value
A Promise that resolves with the signature as an ArrayBuffer.
Throws
| Type | Description |
|---|---|
InvalidAccessError | Raised when the signing key either does not support signing operation, or is incompatible with the selected algorithm. |
Example
import { crypto } from 'k6/experimental/webcrypto';
export default async function () {
const generatedKey = await crypto.subtle.generateKey(
{
name: 'HMAC',
hash: { name: 'SHA-1' },
},
true,
['sign', 'verify']
);
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;
}