func (s *SKB) tsecUnlock(tsec *triplesec.Cipher) ([]byte, error) {
unlocked, err := tsec.Decrypt(s.Priv.Data)
if err != nil {
if _, ok := err.(triplesec.BadPassphraseError); ok {
err = PassphraseError{}
}
return nil, err
}
return unlocked, nil
}
