first key exchange thing

internal/game/user.go

@@ -2,22 +2,18 @@ package game
 
 import (
 	"crypto/ed25519"
-	"crypto/rand"
 )
 
 type User struct {
-	Name       string
-	PublicKey  ed25519.PublicKey
-	PrivateKey ed25519.PrivateKey
+	Name      string
+	PublicKey ed25519.PublicKey
 }
 
-func NewUser(name string) User {
+func NewUser(name string, publicKey ed25519.PublicKey) User {
 	// ed25519
 
-	public, private, _ := ed25519.GenerateKey(rand.Reader)
 	return User{
-		Name:       name,
-		PublicKey:  public,
-		PrivateKey: private,
+		Name:      name,
+		PublicKey: publicKey,
 	}
 }