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daemon/sphinx: split handling.

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We want to use HSM to do the ECDH part, so split that out.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2017-04-01 21:28:30 +10:30
parent e36a65a189
commit 8146b838e8
4 changed files with 43 additions and 12 deletions
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16
daemon/sphinx.h
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@@ -69,13 +69,25 @@ struct onionpacket *create_onionpacket(
const size_t assocdatalen
);
/**
* onion_shared_secret - calculate ECDH shared secret between nodes.
*
* @secret: the shared secret (32 bytes long)
* @pubkey: the public key of the other node
* @privkey: the private key of this node (32 bytes long)
*/
bool onion_shared_secret(
u8 *secret,
const struct onionpacket *packet,
const struct privkey *privkey);
/**
* process_onionpacket - process an incoming packet by stripping one
* onion layer and return the packet for the next hop.
*
* @ctx: tal context to allocate from
* @packet: incoming packet being processed
* @hop_privkey: the processing node's private key to decrypt the packet
* @shared_secret: the result of onion_shared_secret.
* @hoppayload: the per-hop payload destined for the processing node.
* @assocdata: associated data to commit to in HMACs
* @assocdatalen: length of the assocdata
@@ -83,7 +95,7 @@ struct onionpacket *create_onionpacket(
struct route_step *process_onionpacket(
const tal_t * ctx,
const struct onionpacket *packet,
struct privkey *hop_privkey,
const u8 *shared_secret,
const u8 *assocdata,
const size_t assocdatalen
);