How to decrypt a EC password encrypted private key in Go

main.go

...
  privateKeyBytes, err := ioutil.ReadFile("/path/to/my/private.key")
	if err != nil {
		log.Fatalf("failed to read private key file: %v", err)
	}

	block, _ := pem.Decode(privateKeyBytes)
	if err != nil {
		log.Fatalf("failed to decode private key to PEM: %v", err)
	}

	fmt.Printf("private key PEM type: %s\n", block.Type)

	decryptedPrivateKeyBytes, err := x509.DecryptPEMBlock(block, []byte("mysupersecretpassword"))
	if err != nil {
		log.Fatalf("failed to decrypt private key: %v", err)
	}

	ecdsaPrivateKey, err := x509.ParseECPrivateKey(block.Bytes)
	if err != nil {
		log.Fatalf("failed to parse PEM block EC private key: %v", err)
	}

	privateKeyDERBytes, err := x509.MarshalECPrivateKey(ecdsaPrivateKey)
	if err != nil {
		log.Fatalf("failed to marshal EC private key to DER: %v", err)
	}

	keyBlock := &pem.Block{
		Type:  "EC PRIVATE KEY",
		Bytes: privateKeyDERBytes,
	}

	privateKeyBytes = pem.EncodeToMemory(keyBlock)

  fmt.Printf("decoded private key %s\n", string(privateKeyBytes))
...