Christian Decker
7 years ago
3 changed files with 124 additions and 79 deletions
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#include <ccan/opt/opt.h> |
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#include <ccan/read_write_all/read_write_all.h> |
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#include <ccan/short_types/short_types.h> |
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#include <ccan/str/hex/hex.h> |
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#include <common/sphinx.h> |
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#include <common/utils.h> |
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#include <err.h> |
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#include <secp256k1.h> |
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#include <stdio.h> |
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#include <unistd.h> |
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static void do_generate(int argc, char **argv) |
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{ |
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const tal_t *ctx = talz(NULL, tal_t); |
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int num_hops = argc - 1; |
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struct pubkey *path = tal_arr(ctx, struct pubkey, num_hops); |
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u8 privkeys[argc - 1][32]; |
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u8 sessionkey[32]; |
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struct hop_data hops_data[num_hops]; |
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struct secret *shared_secrets; |
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u8 assocdata[32]; |
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memset(&sessionkey, 'A', sizeof(sessionkey)); |
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memset(&assocdata, 'B', sizeof(assocdata)); |
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for (int i = 0; i < num_hops; i++) { |
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hex_decode(argv[1 + i], 66, privkeys[i], 33); |
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if (secp256k1_ec_pubkey_create(secp256k1_ctx, &path[i].pubkey, |
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privkeys[i]) != 1) |
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errx(1, "Could not decode pubkey"); |
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} |
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for (int i = 0; i < num_hops; i++) { |
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memset(&hops_data[i], 0, sizeof(hops_data[i])); |
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hops_data[i].realm = i; |
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memset(&hops_data[i].channel_id, i, |
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sizeof(hops_data[i].channel_id)); |
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hops_data[i].amt_forward = i; |
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hops_data[i].outgoing_cltv = i; |
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printf("Hopdata %d: %s\n", i, tal_hexstr(NULL, &hops_data[i], sizeof(hops_data[i]))); |
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} |
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struct onionpacket *res = |
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create_onionpacket(ctx, path, hops_data, sessionkey, assocdata, |
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sizeof(assocdata), &shared_secrets); |
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u8 *serialized = serialize_onionpacket(ctx, res); |
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if (!serialized) |
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errx(1, "Error serializing message."); |
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char hextemp[2 * tal_count(serialized) + 1]; |
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hex_encode(serialized, tal_count(serialized), hextemp, sizeof(hextemp)); |
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printf("%s\n", hextemp); |
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} |
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static void do_decode(int argc, char **argv) |
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{ |
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struct route_step *step; |
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struct onionpacket *msg; |
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struct privkey seckey; |
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const tal_t *ctx = talz(NULL, tal_t); |
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u8 serialized[TOTAL_PACKET_SIZE]; |
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char hextemp[2 * sizeof(serialized) + 1]; |
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memset(hextemp, 0, sizeof(hextemp)); |
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u8 shared_secret[32]; |
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u8 assocdata[32]; |
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if (argc != 2) |
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opt_usage_exit_fail("Expect a privkey with --decode"); |
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if (!hex_decode(argv[1], strlen(argv[1]), &seckey, sizeof(seckey))) |
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errx(1, "Invalid private key hex '%s'", argv[1]); |
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if (!read_all(STDIN_FILENO, hextemp, sizeof(hextemp))) |
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errx(1, "Reading in onion"); |
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hex_decode(hextemp, sizeof(hextemp), serialized, sizeof(serialized)); |
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msg = parse_onionpacket(ctx, serialized, sizeof(serialized)); |
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if (!msg) |
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errx(1, "Error parsing message."); |
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if (!onion_shared_secret(shared_secret, msg, &seckey)) |
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errx(1, "Error creating shared secret."); |
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step = process_onionpacket(ctx, msg, shared_secret, assocdata, |
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sizeof(assocdata)); |
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if (!step->next) |
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errx(1, "Error processing message."); |
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u8 *ser = serialize_onionpacket(ctx, step->next); |
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if (!ser) |
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errx(1, "Error serializing message."); |
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hex_encode(ser, tal_count(ser), hextemp, sizeof(hextemp)); |
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printf("%s\n", hextemp); |
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} |
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int main(int argc, char **argv) |
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{ |
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bool generate = false, decode = false; |
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secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY | |
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SECP256K1_CONTEXT_SIGN); |
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opt_register_noarg("--help|-h", opt_usage_and_exit, |
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"--generate <pubkey1> <pubkey2>... OR\n" |
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"--decode <privkey>\n" |
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"Either create an onion message, or decode one step", |
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"Print this message."); |
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opt_register_noarg("--generate", opt_set_bool, &generate, |
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"Generate onion through the given hex pubkeys"); |
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opt_register_noarg("--decode", opt_set_bool, &decode, |
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"Decode onion from stdin given the private key"); |
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opt_parse(&argc, argv, opt_log_stderr_exit); |
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if (generate) |
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do_generate(argc, argv); |
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else if (decode) |
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do_decode(argc, argv); |
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return 0; |
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} |
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