Window: crypto property

BaselineWidely available

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

Thecrypto read-only property of theWindow interface returns theCrypto object for this window's scope. This object gives web pages access to certain cryptographic related services.

Although the property itself is read-only, all of its methods (and the methods of itschild object,SubtleCrypto) are not read-only, and therefore vulnerableto attack bypolyfill.

Althoughcrypto is available on all windows, the returnedCrypto object only has one usable feature in insecure contexts: thegetRandomValues() method. In general, you should use this API only in secure contexts.

<p>The random numbers are:</p><button type="button">Generate 10 random numbers</button>

JavaScript

function genRandomNumbers() {  const array = new Uint32Array(10);  globalThis.crypto.getRandomValues(array);  const randText = document.getElementById("myRandText");  randText.textContent = `The random numbers are: ${array.join(" ")}`;}document.querySelector("button").addEventListener("click", genRandomNumbers);