Window.crypto

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The Window.crypto property returns the Crypto object associated to the global object. This object allows web pages access to certain cryptographic related services. Although the Window.crypto 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.

Syntax

var cryptoObj = window.crypto || window.msCrypto; // for IE 11

Example

Using the Window.crypto property to access the getRandomValues() method.

JavaScript

genRandomNumbers = function getRandomNumbers() {
  var array = new Uint32Array(10);
  window.crypto.getRandomValues(array);
 
  var randText = document.getElementById("myRandText");
  randText.innerHTML = "The random numbers are: "
  for (var i = 0; i < array.length; i++) {
    randText.innerHTML += array[i] + " ";
  }
}

HTML

<p id="myRandText">The random numbers are: </p>
<button type="button" onClick='genRandomNumbers()'>Generate 10 random numbers</button>

Result

Specifications

Specification Status Comment
Web Cryptography API
The definition of 'Window.crypto' in that specification.
Recommendation Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
cryptoChrome Full support 37Edge Full support 12Firefox Full support 34IE Full support 11
Prefixed
Full support 11
Prefixed
Prefixed Implemented with the vendor prefix: ms
Opera Full support 24Safari Full support 6.1WebView Android Full support 37Chrome Android Full support 37Firefox Android Full support 34Opera Android Full support 24Safari iOS Full support 6.1Samsung Internet Android Full support Yes

Legend

Full support  
Full support
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

See also