in node 4.1.2 and latter calling `crypto.pbkdf2('password','salt', 1, 4073741824, function(err, resp){console.log(err, resp)});` causes node to crash with the message `Segmentation fault: 11` node 4.1.1 and earlier throw a `TypeError: Bad key length` crypto-browserify/pbkdf2#22 I suspect this commit 4c8d96bc30281d77ab556adfe9cc1f91e0db4522 is to blame