Function SavePrivatePEM

pkg/util/cryptkey/rsa.go:99–127

SavePrivatePEM saves a private PEM key into a file.

(fileName string, key *rsa.PrivateKey)

// SavePrivatePEM saves a private PEM key into a file.
func SavePrivatePEM(fileName string, key *rsa.PrivateKey) error {
	if key == nil {
		return errors.New("cannot save nil key")
	}

	err := key.Validate()
	if err != nil {
		return fmt.Errorf("cannot save invalid key: %v", err)
	}

	outFile, err := os.Create(fileName)
	if err != nil {
		return fmt.Errorf("unable to create key file: %v", err)
	}

	defer outFile.Close()

	privateKey := &pem.Block{
		Type:  "RSA PRIVATE KEY",
		Bytes: x509.MarshalPKCS1PrivateKey(key),
	}

	err = pem.Encode(outFile, privateKey)
	if err != nil {
		return fmt.Errorf("error writing key to file: %v", err)
	}

	return nil
}