CryptoKey: algorithm property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The read-only algorithm property of the CryptoKey interface returns an object describing the algorithm for which this key can be used, and any associated extra parameters.

The object returned depends of the algorithm used to generate the key.

Value

An object matching:

Examples

js
const rawKey = window.crypto.getRandomValues(new Uint8Array(16));

// Import an AES secret key from an ArrayBuffer containing the raw bytes.
// Takes an ArrayBuffer string containing the bytes, and returns a Promise
// that will resolve to a CryptoKey representing the secret key.
function importSecretKey(rawKey) {
  return window.crypto.subtle.importKey("raw", rawKey, "AES-GCM", true, [
    "encrypt",
    "decrypt",
  ]);
}

const key = importSecretKey(rawKey);
console.log(`This key is to be used with the ${key.algorithm} algorithm.`);

Specifications

Specification
Web Cryptography API
# dom-cryptokey-algorithm

Browser compatibility

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