Add Ed25519 support and corresponding CryptoLib.VerifyWithEdDsa method for signature verification

[EdgeDLT]

Summary or problem description

We have assembled a small team to build an account abstraction solution for Neo N3 following discussions from NCA and #2917. We have found that the majority of our needs are already accommodated for in the core, which was a pleasant surprise; thanks to all those that assisted with our investigation.

However, there are other signature types that it would be very beneficial for us to be able to verify. Of course we can already potentially verify Ethereum signatures, though WebAuthn (the protocol we use to simplify key management and transaction signing for users) does not support it, which unfortunately limits our potential uses for it.

However, Ed25519 is supported in WebAuthn, alongside many other major blockchain protocols, and even beyond WebAuthn, it is used in other key services that we wish to integrate with (namely Discord, to assist NNT's GasBot in becoming non-custodial).

So, time to revive #1614. Support for Ed25519 and VerifyWithEdDsa, please!

Where in the software does this update applies to?

• Compiler
• Ledger
• SDK

[roman-khimov]

OK to me as an additional method of our native crypto contract. It's not hard to add it can be useful for various interoperability cases.

[shargon]

I will check it

[shargon]

Hahaha @Jim8y was faster