Provide support of MSIE 11 msCrypto

[danorton-cubic-austin]

MSIE 11 removed support for crypto, renaming their version as msCrypto.

This patch uses window.msCrypto if window.crypto is unavailable (or falls back to the uuid module's RNG).

[broofa]

MSDN crypto docs state the opposite, that IE11 msCrypto support is removed, replaced by [the standard] crypto property. Given that, is this diff needed?

[broofa]

Hmm. :)
... Hmm again

Looks like you're right. :) Ah, MSFT, how you vex me.

[broofa]

Can you reverse the order here? I see some reports that IE11 defines crypto, which would render the above moot. I.e., instead do this:

var _crypto = _global.msCrypto || _global.crypto;

[danorton-cubic-austin]

Sure, but in the (very unlikely) case of both, or where someone else has defined crypto globally, do you prefer the non-standard name over the standard name?

I can say without any question that MSIE11 does not support "crypto" natively, but only supports msCrypto. (crypto was in MSIE10.)

[danorton-cubic-austin]

The MDN page you referenced recommends the order I proposed, as does this MS page:
https://msdn.microsoft.com/en-us/library/ie/dn265046%28v=vs.85%29.aspx

var crypto = window.crypto || window.msCrypto;

[IanYates]

If it helps, here's a screenshot from IE 11's console on a page in edge mode.
Note the different casing - Crypto vs crypto. Weird / unexpected IMHO.

[danorton-cubic-austin]

Crypto != crypto
msCrypto == crypto (for our purposes, here)

[broofa]

Thanks!