ed25519 between golang and nodejs.

main.go

package main

import (
	"crypto/ed25519"
	"crypto/rand"
	"encoding/base64"
	"fmt"
)

func main() {
	// Generate a new private/public key pair
	publicKey, privateKey, err := ed25519.GenerateKey(rand.Reader)
	if err != nil {
		fmt.Println("Error generating key:", err)
		return
	}

	// Convert the public and private keys to Base64
	publicKeyBase64 := base64.StdEncoding.EncodeToString(publicKey)
	privateKeyBase64 := base64.StdEncoding.EncodeToString(privateKey)
	fmt.Println("Public Key:", publicKeyBase64)
	fmt.Println("Private Key:", privateKeyBase64)

	// Sign a message using the private key
	message := "Hello, world!"
	signature := ed25519.Sign(privateKey, []byte(message))
	signatureBase64 := base64.StdEncoding.EncodeToString(signature)
	fmt.Println("Signature:", signatureBase64)
}

test.js

function verifySignature() {
    const publicKeyBase64 = 'NIziXC5F+9yRYq78dGR7imyLdJ/4z7LL/unVNrX9Pmg='
    const signatureBase64 = 'wQ48ufSSXzL8zt2OMPs4HNVQZZ5NJ6j0/QrBGx8JlRcZbuu+aHPxPujowX5Uuuky4ONIsvm//Tt4WWrU8yY1AQ=='
    const message = 'Hello, world!';

    const key = Buffer.concat([
        Buffer.from('302a300506032b6570032100', 'hex'), // Static value
        Buffer.from(publicKeyBase64, 'base64'),
    ])
 
    const verifyKey = crypto.createPublicKey({
        format: 'der',
        type: 'spki',
        key,
    })

    // const publicKey = Buffer.from(publicKeyBase64, 'base64');
    const signatureData = Buffer.from(signatureBase64, 'base64');
    
    return crypto.verify(null, Buffer.from(message), verifyKey, signatureData);
}