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I need to generate cryptographically secure pseudorandom numbers, in Javascript. I know about the window.crypto.getRandomValues API, which does exactly what I want. However, I also know it was introduced relatively recently (in 2011 or so).
Can I safely assume window.crypto.getRandomValues is present, or will using it introduce compatibility problems on some browsers? Are there any major (widely used) browsers which do not support window.crypto.getRandomValues (including mobile or desktop browsers), and if so, which ones do I need to worry about? I would be delighted to learn that there is enough support that I no longer need to worry about fallback methods, if that is indeed the case.
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getRandomValues() The Crypto. getRandomValues() method lets you get cryptographically strong random values. The array given as the parameter is filled with random numbers (random in its cryptographic meaning).
The window. crypto property returns a Crypto object which is associated with the global object. This object allows web pages to run various cryptographic operations on the browser side. It has one property, which is the subtle property.
Can I safely assume window.crypto.getRandomValues is present
As always it depends on your target market and will change over time. caniuse.com lists which browsers support it and calculates the browser marketshare.
Here is a summary:
IE Mobile 11: w/ prefix
Firefox: 21+
Firefox Mobile: 21+
Safari: from 6.1
Safari Mobile: 7.1
Chrome: 11+
Android browser: 4.4
Opera: 15+
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For a more complete, up-to-date view, it's probably better to just check caniuse.com:
http://caniuse.com/#feat=getrandomvalues
As of December 2015, all modern browsers, except for Opera Mini, support it:
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