// Loads and parses a private key.
func loadKey(path string) *otr.PrivateKey {
establishDir(false)
base64Key, err := ioutil.ReadFile(path)
if os.IsNotExist(err) {
exitPrintf("The private key (%s) does not exist. Please use genkey.\n",
path)
}
if err != nil {
exitError(err)
}
rawKey := make([]byte, base64.StdEncoding.DecodedLen(len(base64Key)))
n, err := base64.StdEncoding.Decode(rawKey, base64Key)
if err != nil {
exitError(err)
}
key := new(otr.PrivateKey)
if _, ok := key.Parse(rawKey[:n]); !ok {
exitPrintf("Invalid or corrupted private key (%s).\n", path)
}
return key
}
