Hi,

Would you be open to either just replacing ring with the more up to date and actively maintained aws-lc-rs alternative? They are API compatible, so that should not be a complicated change.

Or, if you are not OK with outright just changing the backend, would you be open to making it configurable? So the downstream user of shadowsocks-crypto can select at either compile time or runtime if they want ring or aws-lc-rs? Much like what GotaTun has with this PR: mullvad/gotatun#122. Or what rustls has by making the crypto provider a runtime selection.