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common/sphinx: make onionpacket.routinginfo a dynamic member.

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Still asserts that it's the standard size, but makes it a dynamic
member.  For simpliciy, changes the parse_onionpacket API (it must be
a tal object now, so we might as well allocate it here to catch all
the callers).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-12-08 21:05:32 +10:30
committed by Christian Decker
parent 3776af4a35
commit 32c7c133f4
13 changed files with 118 additions and 95 deletions
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26
common/sphinx.h
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@@ -28,8 +28,8 @@ struct onionpacket {
struct hmac hmac;
struct pubkey ephemeralkey;
/* Encrypted information */
u8 routinginfo[ROUTING_INFO_SIZE];
/* Encrypted information (tal arr)*/
u8 *routinginfo;
};
struct sphinx_compressed_onion {
@@ -99,18 +99,14 @@ struct route_step {
* over a path of intermediate nodes.
*
* @ctx: tal context to allocate from
* @path: public keys of nodes along the path.
* @hoppayloads: payloads destined for individual hosts (limited to
* HOP_PAYLOAD_SIZE bytes)
* @num_hops: path length in nodes
* @sessionkey: 32 byte random session key to derive secrets from
* @assocdata: associated data to commit to in HMACs
* @assocdatalen: length of the assocdata
* @path_secrets: (out) shared secrets generated for the entire path
* @sphinx_path: path to encode along.
* @fixed_size: the size of the onion packet eg ROUTING_INFO_SIZE (fails if input is larger)
* @secrets: (out) shared secrets generated for the entire path
*/
struct onionpacket *create_onionpacket(
const tal_t * ctx,
struct sphinx_path *sp,
size_t fixed_size,
struct secret **path_secrets
);
@@ -160,13 +156,15 @@ u8 *serialize_onionpacket(
/**
* parse_onionpacket - Parse an onionpacket from a buffer.
*
* @ctx: the context to allocate return value from.
* @src: buffer to read the packet from
* @srclen: length of the @src (must be TOTAL_PACKET_SIZE)
* @dest: the destination into which we should parse the packet
* @failcode: the failure code (set iff this returns NULL)
*/
enum onion_wire parse_onionpacket(const u8 *src,
const size_t srclen,
struct onionpacket *dest);
struct onionpacket *parse_onionpacket(const tal_t *ctx,
const u8 *src,
const size_t srclen,
enum onion_wire *failcode);
/**
* create_onionreply - Format a failure message so we can return it