Now that I've ended up with two MacBooks with USB port scarcity, I'm *really* wondering if I can eventually get the SEP to host ed25519 SSH keys, so I don't have to keep a YubiKey plugged in. If their API supports that primitive, that'd make SEP support really useful.
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assuming "256-bit elliptic curve private keys" means ed25519
It seems to be NIST ECDSA, see here: https://github.com/sekey/sekey But maybe their internal APIs support ed25519 too.