Function generateKeyPair

sshgen/sshgen.go:146–184

generateKeyPair creates a EC keypair (P256) and stores them in the homedir. returns the generated public key from the successful keypair generation

(fullName string)

// generateKeyPair creates a EC keypair (P256) and stores them in the homedir.
// returns the generated public key from the successful keypair generation
func generateKeyPair(fullName string) ([]byte, error) {
	pubKeyName := fullName + ".pub"

	exist, err := config.FileExists(pubKeyName)
	if err != nil {
		return nil, err
	}
	if exist {
		return os.ReadFile(pubKeyName)
	}

	key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		return nil, err
	}
	parsed, err := x509.MarshalECPrivateKey(key)
	if err != nil {
		return nil, err
	}

	if err := writeKey(fullName, pem.EncodeToMemory(&pem.Block{
		Type:  "EC PRIVATE KEY",
		Bytes: parsed,
	})); err != nil {
		return nil, err
	}

	pub, err := gossh.NewPublicKey(&key.PublicKey)
	if err != nil {
		return nil, err
	}
	data := gossh.MarshalAuthorizedKey(pub)

	if err := writeKey(pubKeyName, data); err != nil {
		return nil, err
	}

	return data, nil
}

// writeKey will write a key to disk in DER format (it's a standard pem key)
func writeKey(filename string, data []byte) error {