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)
}
