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#include <ccan/opt/opt.h>
#include <ccan/read_write_all/read_write_all.h>
#include <ccan/short_types/short_types.h>
#include <ccan/str/hex/hex.h>
#include <common/sphinx.h>
#include <common/utils.h>
#include <err.h>
#include <secp256k1.h>
#include <stdio.h>
#include <unistd.h>
static void do_generate(int argc, char **argv)
{
const tal_t *ctx = talz(NULL, tal_t);
int num_hops = argc - 1;
struct pubkey *path = tal_arr(ctx, struct pubkey, num_hops);
u8 privkeys[argc - 1][32];
u8 sessionkey[32];
struct hop_data hops_data[num_hops];
struct secret *shared_secrets;
u8 assocdata[32];
memset(&sessionkey, 'A', sizeof(sessionkey));
memset(&assocdata, 'B', sizeof(assocdata));
for (int i = 0; i < num_hops; i++) {
hex_decode(argv[1 + i], 66, privkeys[i], 33);
if (secp256k1_ec_pubkey_create(secp256k1_ctx, &path[i].pubkey,
privkeys[i]) != 1)
errx(1, "Could not decode pubkey");
fprintf(stderr, "Node %d pubkey %s\n", i, secp256k1_pubkey_to_hexstr(ctx, &path[i].pubkey));
}
for (int i = 0; i < num_hops; i++) {
memset(&hops_data[i], 0, sizeof(hops_data[i]));
hops_data[i].realm = i;
memset(&hops_data[i].channel_id, i,
sizeof(hops_data[i].channel_id));
hops_data[i].amt_forward = i;
hops_data[i].outgoing_cltv = i;
fprintf(stderr, "Hopdata %d: %s\n", i, tal_hexstr(NULL, &hops_data[i], sizeof(hops_data[i])));
}
struct onionpacket *res =
create_onionpacket(ctx, path, hops_data, sessionkey, assocdata,
sizeof(assocdata), &shared_secrets);
u8 *serialized = serialize_onionpacket(ctx, res);
if (!serialized)
errx(1, "Error serializing message.");
else
printf("%s\n", tal_hex(ctx, serialized));
tal_free(ctx);
}
static void do_decode(int argc, char **argv)
{
struct route_step *step;
struct onionpacket *msg;
struct privkey seckey;
const tal_t *ctx = talz(NULL, tal_t);
u8 serialized[TOTAL_PACKET_SIZE];
char hextemp[2 * sizeof(serialized) + 1];
memset(hextemp, 0, sizeof(hextemp));
u8 shared_secret[32];
u8 assocdata[32];
memset(&assocdata, 'B', sizeof(assocdata));
if (argc != 2)
opt_usage_exit_fail("Expect a privkey with --decode");
if (!hex_decode(argv[1], strlen(argv[1]), &seckey, sizeof(seckey)))
errx(1, "Invalid private key hex '%s'", argv[1]);
if (!read_all(STDIN_FILENO, hextemp, sizeof(hextemp)))
errx(1, "Reading in onion");
hex_decode(hextemp, sizeof(hextemp), serialized, sizeof(serialized));
msg = parse_onionpacket(ctx, serialized, sizeof(serialized));
if (!msg)
errx(1, "Error parsing message.");
if (!onion_shared_secret(shared_secret, msg, &seckey))
errx(1, "Error creating shared secret.");
step = process_onionpacket(ctx, msg, shared_secret, assocdata,
sizeof(assocdata));
if (!step || !step->next)
errx(1, "Error processing message.");
u8 *ser = serialize_onionpacket(ctx, step->next);
if (!ser)
errx(1, "Error serializing message.");
printf("%s\n", tal_hex(ctx, ser));
tal_free(ctx);
}
int main(int argc, char **argv)
{
bool generate = false, decode = false;
secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY |
SECP256K1_CONTEXT_SIGN);
opt_register_noarg("--help|-h", opt_usage_and_exit,
"--generate <pubkey1> <pubkey2>... OR\n"
"--decode <privkey>\n"
"Either create an onion message, or decode one step",
"Print this message.");
opt_register_noarg("--generate", opt_set_bool, &generate,
"Generate onion through the given hex pubkeys");
opt_register_noarg("--decode", opt_set_bool, &decode,
"Decode onion from stdin given the private key");
opt_parse(&argc, argv, opt_log_stderr_exit);
if (generate)
do_generate(argc, argv);
else if (decode)
do_decode(argc, argv);
return 0;
}