nkeys-rb

https://github.com/n-at-han-k/nkeys-rb

NATS NKeys for Ruby, as a native extension over the Rust `nkeys` crate: Ed25519 keypairs across every key role, and the x25519 XKey sealing used by NATS auth callout. Named nkeys-rb because the plain `nkeys` gem name is taken by an unrelated pure-Ruby implementation.