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common/blindedpath: expose API at a lower level.

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We actually want lightningd to create these, since it wants to put the
path_id secret in the last element.  So best API is actually a generic
one, rather than separate APIs to create first and last ones.

And really, the more explicit initialization makes the users clearer.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-11-09 12:00:10 +10:30
committed by Christian Decker
parent 01a47720c3
commit 4cfd972407
7 changed files with 124 additions and 159 deletions
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42
plugins/fetchinvoice.c
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@@ -619,6 +619,7 @@ send_modern_message(struct command *cmd,
size_t nhops = tal_count(sent->path);
struct tlv_onionmsg_tlv **payloads;
struct out_req *req;
struct tlv_encrypted_data_tlv *tlv;
/* Now create enctlvs for *forward* path. */
randombytes_buf(&blinding_iter, sizeof(blinding_iter));
@@ -634,25 +635,30 @@ send_modern_message(struct command *cmd,
for (size_t i = 1; i < nhops - 1; i++) {
payloads[i] = tlv_onionmsg_tlv_new(payloads);
payloads[i]->encrypted_recipient_data = create_enctlv(payloads[i],
&blinding_iter,
&sent->path[i],
&sent->path[i+1],
NULL,
/* FIXME: Pad? */
0,
NULL, NULL, NULL, NULL,
&blinding_iter,
&node_alias[i]);
tlv = tlv_encrypted_data_tlv_new(tmpctx);
tlv->next_node_id = &sent->path[i+1];
/* FIXME: Pad? */
payloads[i]->encrypted_recipient_data
= encrypt_tlv_encrypted_data(payloads[i],
&blinding_iter,
&sent->path[i],
tlv,
&blinding_iter,
&node_alias[i]);
}
/* Final payload contains the actual data. */
payloads[nhops-1] = sending->payload;
/* We don't include enctlv in final, but it gives us final alias */
if (!create_final_enctlv(tmpctx, &blinding_iter, &sent->path[nhops-1],
/* FIXME: Pad? */ 0,
NULL, NULL,
&node_alias[nhops-1])) {
tlv = tlv_encrypted_data_tlv_new(tmpctx);
if (!encrypt_tlv_encrypted_data(tmpctx,
&blinding_iter,
&sent->path[nhops-1],
tlv,
NULL,
&node_alias[nhops-1])) {
/* Should not happen! */
return command_fail(cmd, LIGHTNINGD,
"Could create final enctlv");
@@ -668,12 +674,12 @@ send_modern_message(struct command *cmd,
json_add_pubkey(req->js, "blinding", &fwd_blinding);
json_array_start(req->js, "hops");
for (size_t i = 1; i < nhops; i++) {
u8 *tlv;
u8 *tlvbin;
json_object_start(req->js, NULL);
json_add_pubkey(req->js, "id", &node_alias[i]);
tlv = tal_arr(tmpctx, u8, 0);
towire_tlv_onionmsg_tlv(&tlv, payloads[i]);
json_add_hex_talarr(req->js, "tlv", tlv);
tlvbin = tal_arr(tmpctx, u8, 0);
towire_tlv_onionmsg_tlv(&tlvbin, payloads[i]);
json_add_hex_talarr(req->js, "tlv", tlvbin);
json_object_end(req->js);
}
json_array_end(req->js);