Constant-time, 100% managed, MIT-licensed, .NET 10 Curve25519/Ed25519 cryptography — standard
RFC 8032 Ed25519 sign and verify, plus the low-level field and group operations that standard signing APIs
hide, including Tor-style Ed25519 key blinding (scalar-mult by an arbitrary scalar/point, scalar arithmetic
mod L, point encode/decode and torsion checks).
MIT.