Using Ed25519 generated with OpenSSL

Summary

Hi there.
I'm building a JVM based application that relies on pre-generated Ed25519 keys to provide safe communication between peers.

I'm observing some weird behavior that feels like a bug.

Expected behavior

Given a Ed25519 key generated via open ssl:

*@*:/tmp                                                                                                                                                                                                                                                                                                                                                        ⍉
▶ openssl genpkey -algorithm Ed25519 -out ed25519_private.pem && openssl pkey -in ed25519_private.pem -pubout -out ed25519_public.pem

*@*:/tmp                                                                                                                                                                                                                                                                                                                                                        ▶ ll ed25519_p*.pem
Permissions Size User    Date Modified Name
.rw-------   119 viperey  3 Apr 08:50  ed25519_private.pem
.rw-r--r--   113 viperey  3 Apr 08:50  ed25519_public.pem

*@*:/tmp                                                                                                                                                                                                                                                                                                                                                        ▶ cat ed25519_p*.pem
       │ File: ed25519_private.pem
   1   │ -----BEGIN PRIVATE KEY-----
   2   │ MC4CAQAwBQYDK2VwBCIEIH9ZvvvlDocfq7dDFBjsLJEF8oo8N+2VeI7K2QIJkWPx
   3   │ -----END PRIVATE KEY-----
──────────────────────────────────────────────────────────       │ File: ed25519_public.pem
   1   │ -----BEGIN PUBLIC KEY-----
   2   │ MCowBQYDK2VwAyEA08ZD6jfldUOHtv/77PFbVWCq+ZnrYQm3u8ucW3bh0fw=
   3   │ -----END PUBLIC KEY-----
───────┴──────────────────────────────────────────────────

When a host is created with the private key, the peerId derivated via (private key in disk -> public key generated by lib-p2p -> peerId) won't be the same as if generating one via (public key in disk -> peerId).

Some (scala) code to observe this behavior:

  val privateKeyFs: PrivKey = Ed25519Kt
    .unmarshalEd25519PrivateKey(
      Base64.getDecoder.decode(
        "MC4CAQAwBQYDK2VwBCIEIH9ZvvvlDocfq7dDFBjsLJEF8oo8N+2VeI7K2QIJkWPx"
      )
    )
    val publicKeyFs = privateKeyFs.publicKey()
    val publicKeyFsStr = Base64.getEncoder.encodeToString(publicKeyFsStr.bytes())
    val peerIdFS: PeerId = PeerId.fromPubKey(publicKeyFs)


    val directlyPublicKey = Ed25519Kt.unmarshalEd25519PublicKey(
      Base64.getDecoder.decode("MCowBQYDK2VwAyEA08ZD6jfldUOHtv/77PFbVWCq+ZnrYQm3u8ucW3bh0fw=")
    )
    val directlyPublicKeyStr  = Base64.getEncoder.encodeToString(directlyPublicKeyStr.bytes())
    val directlyPeerId: PeerId = PeerId.fromPubKey(
      directlyPublicKey
    )
    
    assert(directlyPublicKeyStr == publicKeyFsStr)
    assert(directlyPeerId == peerIdFS)

(The assertions fails)

Actual behavior

The public key values do not match and neither the peerId values.
In both (private and public) cases the unmarshalling works, but the values simply do not match.

Relevant log output

No response

Possible Solution

No response

Version

1.1.0-RELEASE

Would you like to work on fixing this bug ?

Maybe

Start at Ed25519Kt.unmarshalEd25519PrivateKey and unmarshalEd25519PublicKey, using the OpenSSL-generated key values and Scala reproduction in the issue. Compare the public key bytes and derived peer IDs from both paths, then add a regression test showing that they match for these inputs.