// We only seriously intend to rely on the channel_master_key for true secure
// entropy, everything else just ensures uniqueness. We rely on the unique_start (ie
// starting_time provided in the constructor) to be unique.
- let child_privkey = self.channel_master_key.ckd_priv(&self.secp_ctx, ChildNumber::from_hardened_idx(chan_id as u32).expect("key space exhausted")).expect("Your RNG is busted");
+ let child_privkey = self.channel_master_key.ckd_priv(&self.secp_ctx,
+ ChildNumber::from_hardened_idx((chan_id as u32) % (1 << 31)).expect("key space exhausted")
+ ).expect("Your RNG is busted");
unique_start.input(&child_privkey.private_key[..]);
let seed = Sha256::from_engine(unique_start).into_inner();