func (o *OcCred) SignOcReq(req *msg.OcReq) error {
h, err := getReqSigDataHash(req)
if err != nil {
return err
}
randBytes := make([]byte, SIG_RAND_NUM_BYTES)
_, err = rand.Read(randBytes)
if err != nil {
return errors.New("error generating random bytes")
}
r, s, err := ecdsa.Sign(bytes.NewReader(randBytes), o.Priv, h)
if err != nil {
return fmt.Errorf("error during ECDSA signature: %v", err.Error())
}
req.ID = o.ID()
req.Sig = fmt.Sprintf("%x,%x", r, s)
return nil
}
