ssh-keygen -t ed25519 -f service-account-key -N ""

cat service-account-key.pub

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAI... your-user@your-computer

# Generate private key
openssl genpkey -algorithm Ed25519 -out private.pem

# Extract public key
openssl pkey -in private.pem -pubout -out public.pem

import { generateKeyPairSync } from 'crypto';
import { writeFileSync } from 'fs';

const { publicKey, privateKey } = generateKeyPairSync('ed25519', {
  publicKeyEncoding: { type: 'spki', format: 'pem' },
  privateKeyEncoding: { type: 'pkcs8', format: 'pem' }
});

writeFileSync('private.pem', privateKey);
writeFileSync('public.pem', publicKey);

from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
from cryptography.hazmat.primitives import serialization

private_key = Ed25519PrivateKey.generate()
public_key = private_key.public_key()

# Save private key
with open("private.pem", "wb") as f:
    f.write(private_key.private_bytes(
        encoding=serialization.Encoding.PEM,
        format=serialization.PrivateFormat.PKCS8,
        encryption_algorithm=serialization.NoEncryption()
    ))

# Save public key
with open("public.pem", "wb") as f:
    f.write(public_key.public_bytes(
        encoding=serialization.Encoding.PEM,
        format=serialization.PublicFormat.SubjectPublicKeyInfo
    ))

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAI... optional-comment