func DecryptAuth(in []byte, ratch *ratchet.Ratchet) (*ratchet.Ratchet, []byte, error) {
msg, err := ratch.Decrypt(in)
if err != nil {
return nil, nil, err
}
unpadMsg := proto.Unpad(msg)
return ratch, unpadMsg, nil
}
func LoadRatchet(d *Daemon, name string, fillAuth func(tag, data []byte, theirAuthPublic *[32]byte), checkAuth func(tag, data, msg []byte, ourAuthPrivate *[32]byte) error) (*ratchet.Ratchet, error) {
ratch := new(ratchet.Ratchet)
if err := persistence.UnmarshalFromFile(d.ratchetPath(name), ratch); err != nil {
return nil, err
}
ratch.FillAuth = fillAuth
ratch.CheckAuth = checkAuth
return ratch, nil
}
func AllRatchets(d *Daemon, fillAuth func(tag, data []byte, theirAuthPublic *[32]byte), checkAuth func(tag, data, msg []byte, ourAuthPrivate *[32]byte) error) ([]*ratchet.Ratchet, error) {
files, err := ioutil.ReadDir(d.ratchetKeysDir())
if err != nil {
return nil, err
}
ret := make([]*ratchet.Ratchet, 0, len(files))
for _, file := range files {
if file.IsDir() {
continue
}
ratch := new(ratchet.Ratchet)
err := persistence.UnmarshalFromFile(filepath.Join(d.ratchetKeysDir(), file.Name()), ratch)
if err != nil {
return nil, fmt.Errorf("failed to parse ratchet for \"%s\": %s", file.Name(), err)
}
ratch.FillAuth = fillAuth
ratch.CheckAuth = checkAuth
ret = append(ret, ratch)
}
return ret, nil
}
func EncryptAuth(message []byte, ratch *ratchet.Ratchet) ([]byte, *ratchet.Ratchet, error) {
paddedMsg := proto.Pad(message, proto.MAX_MESSAGE_SIZE-ENCRYPT_ADDED_LEN)
out := ratch.Encrypt(nil, paddedMsg)
return out, ratch, nil
}