https://blog.wongcw.com/2020/09/09/%e8%98%8b%e6%9e%9c%e5%90%91%e9%96%8b%e7%99%bc%e8%80%85%e4%bb%8b%e7%b4%b9cryptokit%e5%92%8cswift-crypto%e7%9a%84%e6%96%b0%e5%8a%9f%e8%83%bd/