modernizr
Version:
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
34 lines (31 loc) • 1.21 kB
JavaScript
/*!
{
"name": "getRandomValues",
"property": "getrandomvalues",
"caniuse": "getrandomvalues",
"tags": ["crypto"],
"authors": ["komachi"],
"notes": [{
"name": "W3C Editor’s Draft Spec",
"href": "https://w3c.github.io/webcrypto/#Crypto-interface-methods"
}],
"polyfills": ["polycrypt"]
}
!*/
/* DOC
Detects support for the window.crypto.getRandomValues method for generating cryptographically secure random numbers
*/
define(['Modernizr', 'prefixed', 'is'], function(Modernizr, prefixed, is) {
// In Safari <=5.0 `window.crypto` exists (for some reason) but is `undefined`, so we have to check
// it’s truthy before checking for existence of `getRandomValues`
var crypto = prefixed('crypto', window);
var supportsGetRandomValues;
// Safari 6.0 supports crypto.getRandomValues, but does not return the array,
// which is required by the spec, so we need to actually check.
if (crypto && 'getRandomValues' in crypto && 'Uint32Array' in window) {
var array = new Uint32Array(10);
var values = crypto.getRandomValues(array);
supportsGetRandomValues = values && is(values[0], 'number');
}
Modernizr.addTest('getrandomvalues', !!supportsGetRandomValues);
});