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sphinx: Add functions to decompress

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Also implements a way to decompress an onion using the devtools/onion tool

Changelog-Added: devtools: The `onion` tool can now generate, compress and decompress onions for rendez-vous routing
This commit is contained in:
Christian Decker
2020-02-28 17:55:43 +01:00
committed by Rusty Russell
parent 4724d55e80
commit 49a3321d7e
3 changed files with 64 additions and 0 deletions
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33
devtools/onion.c
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@@ -290,6 +290,30 @@ static void runtest(const char *filename)
tal_free(ctx);
}
static void decompress(char *hexprivkey, char *hexonion)
{
struct privkey rendezvous_key;
size_t onionlen = hex_data_size(strlen(hexonion));
u8 *compressed, *decompressed;
struct pubkey ephkey;
struct secret shared_secret;
if (!hex_decode(hexprivkey, strlen(hexprivkey), &rendezvous_key, sizeof(rendezvous_key)))
errx(1, "Invalid private key hex '%s'", hexprivkey);
compressed = tal_arr(NULL, u8, onionlen);
if (!hex_decode(hexonion, strlen(hexonion), compressed, onionlen))
errx(1, "Invalid onion hex '%s'", hexonion);
if (onionlen < HMAC_SIZE + 1 + PUBKEY_SIZE)
errx(1, "Onion is too short to contain the version, ephemeral key and HMAC");
pubkey_from_der(compressed + 1, PUBKEY_SIZE, &ephkey);
decompressed = sphinx_decompress(NULL, compressed, &shared_secret);
printf("Decompressed Onion: %s\n", tal_hex(NULL, decompressed));
}
/* Tal wrappers for opt. */
static void *opt_allocfn(size_t size)
{
@@ -353,6 +377,15 @@ int main(int argc, char **argv)
do_generate(argc, argv, assocdata, NULL);
else
do_generate(argc, argv, assocdata, &rendezvous_id);
} else if (streq(method, "decompress")) {
if (argc != 4) {
errx(2,
"'%s decompress' requires a private key and a "
"compressed onion",
argv[0]);
}
decompress(argv[2], argv[3]);
} else if (streq(method, "decode")) {
do_decode(argc, argv, assocdata);
} else {