[Zarathustra_]

Previous thread with lots of relevant information: https://news.ycombinator.com/item?id=8542405

Short answer is yes usually, and if not, you can always do inline asm. Of course, you're really, really, really not supposed to write your own crypto.

[vinay_ys]

If everyone follows this advice, who will write the crypto code? If anything we need lot more people who are formally trained to write proper crypto code and find bugs in such code etc.

[Zarathustra_]

Let me qualify that. You're right, we do need a lot more people. But the answer is, don't write your own, write as part of a team. Ideally, a public and peer-reviewed project. The short answer is many people will work on it together, but don't write your own.