func main() { var challenge = os.Args[1] var err error var parthandle *os.File parthandle, err = os.Open(os.Args[2]) if err != nil { log.Fatal(err) } var partreader = bufio.NewReader(parthandle) var randreader *os.File randreader, err = os.Open("/dev/random") if err != nil { log.Fatal(err) } var group *bbssig.Group = new(bbssig.Group) var mem *bbssig.MemberKey = new(bbssig.MemberKey) var hash = sha256.New() var cb []byte var response []byte objpack.UnPackPart(partreader, group, mem) cb, err = base64.StdEncoding.DecodeString(challenge) if err != nil { log.Fatal("Invalid Challenge") } response, err = mem.Sign(randreader, cb, hash) if err != nil { log.Fatal(err) } basepack.Packout(os.Stdout, response) }
func answerChallenge(message string, memberKey *bbssig.MemberKey) string { out, err := memberKey.Sign(rand.Reader, []byte(message), sha1.New()) if err != nil { log.Printf("Challenge failed. Error was: %s\n", err) } return string(out) }