self.crypto
The global read-only crypto
property returns the Crypto
object associated to the global object. This object allows web pages access to certain cryptographic related services.
Although the property itself is read-only, all of its methods (and the methods of its
child object, SubtleCrypto
) are not read-only, and therefore vulnerable
to attack by polyfill.
Although crypto
is available on all windows, the returned Crypto
object only has one usable feature in insecure contexts: the getRandomValues()
method. In general, you should use this API only in secure contexts.
Value
An instance of the Crypto
interface, providing access to general-purpose cryptography and a strong random-number generator.
Examples
This example uses the crypto
property to access the getRandomValues()
method.
JavaScript
genRandomNumbers = function getRandomNumbers() {
const array = new Uint32Array(10);
crypto.getRandomValues(array);
const randText = document.getElementById("myRandText");
randText.textContent = "The random numbers are: "
for (let i = 0; i < array.length; i++) {
randText.textContent += array[i] + " ";
}
}
HTML
<p id="myRandText">The random numbers are: </p>
<button type="button" onClick='genRandomNumbers()'>Generate 10 random numbers</button>
Result
Specifications
Specification |
---|
Web Cryptography API # dom-windoworworkerglobalscope-crypto |
Browser compatibility
BCD tables only load in the browser