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sphinx: Incrementally wrap replies in new onion layers

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This commit is contained in:
Christian Decker
2017-05-03 12:40:03 +02:00
committed by Rusty Russell
parent 9820abda7c
commit 870b83f67f
2 changed files with 42 additions and 21 deletions
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10
lightningd/sphinx.c
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@@ -373,6 +373,7 @@ struct onionpacket *create_onionpacket(
u8 nexthmac[SECURITY_PARAMETER];
u8 stream[ROUTING_INFO_SIZE];
struct hop_params *params = generate_hop_params(ctx, sessionkey, path);
struct sha256 *secrets = tal_arr(ctx, struct sha256, num_hops);
if (!params)
return NULL;
@@ -405,10 +406,11 @@ struct onionpacket *create_onionpacket(
memcpy(packet->mac, nexthmac, sizeof(nexthmac));
memcpy(&packet->ephemeralkey, &params[0].ephemeralkey, sizeof(secp256k1_pubkey));
*path_secrets = tal_arr(ctx, struct sha256, num_hops);
for (i=0; i<num_hops; i++) {
create_shared_secret((*path_secrets)[i].u.u8, &path[i].pubkey, sessionkey);
memcpy(&secrets[i], params[i].secret, SHARED_SECRET_SIZE);
}
*path_secrets = secrets;
return packet;
}
@@ -516,6 +518,10 @@ struct onionreply *unwrap_onionreply(const tal_t *ctx, u8 **shared_secrets,
size_t max;
u16 msglen;
if (tal_len(reply) != ONION_REPLY_SIZE + sizeof(hmac) + 4) {
goto fail;
}
memcpy(msg, reply, tal_len(reply));
oreply->origin_index = -1;