func serializePrivateKey(key libtrust.PrivateKey, ext string) (encoded []byte, err error) {
if ext == ".json" || ext == ".jwk" {
encoded, err = json.Marshal(key)
if err != nil {
return nil, fmt.Errorf("unable to encode private key JWK: %s", err)
}
} else {
pemBlock, err := key.PEMBlock()
if err != nil {
return nil, fmt.Errorf("unable to encode private key PEM: %s", err)
}
encoded = pem.EncodeToMemory(pemBlock)
}
return
}
