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sphinx: Treat compressed onions as a standalone struct

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Expands the interface to play with onions a bit more. Potentially a bit
slower due to allocations, but that's a small price to pay. It also allows us
to avoid serializing a compressed onion to `u8*` if we process it right away.
This commit is contained in:
Christian Decker
2020-03-02 15:00:25 +01:00
committed by Rusty Russell
parent fd37c5b672
commit e79cda8c9a
3 changed files with 114 additions and 19 deletions
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27
common/sphinx.h
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@@ -30,6 +30,14 @@ struct onionpacket {
u8 routinginfo[ROUTING_INFO_SIZE];
};
struct sphinx_compressed_onion {
u8 version;
struct pubkey ephemeralkey;
u8 *routinginfo;
u8 mac[HMAC_SIZE];
};
enum route_next_case {
ONION_END = 0,
ONION_FORWARD = 1,
@@ -250,8 +258,9 @@ bool sphinx_path_set_rendezvous(struct sphinx_path *sp,
* Given a compressed onion expand it by re-generating the prefiller and
* inserting it in the appropriate place.
*/
u8 *sphinx_decompress(const tal_t *ctx, const u8 *compressed,
struct secret *shared_secret);
struct onionpacket *sphinx_decompress(const tal_t *ctx,
const struct sphinx_compressed_onion *src,
const struct secret *shared_secret);
/**
* Use ECDH to generate a shared secret from a privkey and a pubkey.
@@ -264,6 +273,20 @@ bool sphinx_create_shared_secret(struct secret *privkey,
const struct pubkey *pubkey,
const struct secret *secret);
/**
* Given a compressible onionpacket, return the compressed version.
*/
struct sphinx_compressed_onion *
sphinx_compress(const tal_t *ctx, const struct onionpacket *packet,
const struct sphinx_path *path);
u8 *sphinx_compressed_onion_serialize(
const tal_t *ctx, const struct sphinx_compressed_onion *onion);
struct sphinx_compressed_onion *
sphinx_compressed_onion_deserialize(const tal_t *ctx, const u8 *src);
#if DEVELOPER
/* Override to force us to reject valid onion packets */
extern bool dev_fail_process_onionpacket;