| 28 | } |
| 29 | |
| 30 | int main(int argc, char *argv[]) |
| 31 | { |
| 32 | u8 *u5sig, *u8sig; |
| 33 | size_t len; |
| 34 | secp256k1_ecdsa_recoverable_signature rsig; |
| 35 | struct sha256_ctx sctx = SHA256_INIT; |
| 36 | struct sha256_double shad; |
| 37 | struct pubkey reckey; |
| 38 | const char *keystr; |
| 39 | |
| 40 | setup_locale(); |
| 41 | err_set_progname(argv[0]); |
| 42 | wally_init(0); |
| 43 | secp256k1_ctx = wally_get_secp_context(); |
| 44 | |
| 45 | if (argc != 3 && argc != 4) |
| 46 | usage(); |
| 47 | |
| 48 | u5sig = tal_arr(NULL, u8, strlen(argv[2])); |
| 49 | for (size_t i = 0; argv[2][i]; i++) { |
| 50 | u5sig[i] = zbase32_revchars[(unsigned char)argv[2][i]]; |
| 51 | if (u5sig[i] > 31) |
| 52 | errx(1, "Not a valid zbase32 string"); |
| 53 | } |
| 54 | u8sig = tal_arr(NULL, u8, (strlen(argv[2]) * 5 + 7) / 8 + 1); |
| 55 | len = 0; |
| 56 | if (!bech32_convert_bits(u8sig, &len, 8, u5sig, strlen(argv[2]), 5, false)) |
| 57 | errx(1, "Invalid string"); |
| 58 | |
| 59 | if (len != 65) |
| 60 | errx(1, "Signature too %s", len < 65 ? "short" : "long"); |
| 61 | |
| 62 | if (!secp256k1_ecdsa_recoverable_signature_parse_compact(secp256k1_ctx, |
| 63 | &rsig, |
| 64 | u8sig + 1, |
| 65 | u8sig[0] - 31)) |
| 66 | errx(1, "Signature not parsable"); |
| 67 | |
| 68 | sha256_update(&sctx, "Lightning Signed Message:", |
| 69 | strlen("Lightning Signed Message:")); |
| 70 | sha256_update(&sctx, argv[1], strlen(argv[1])); |
| 71 | sha256_double_done(&sctx, &shad); |
| 72 | |
| 73 | if (!secp256k1_ecdsa_recover(secp256k1_ctx, &reckey.pubkey, &rsig, |
| 74 | shad.sha.u.u8)) |
| 75 | errx(1, "Signature not recoverable"); |
| 76 | |
| 77 | keystr = fmt_pubkey(NULL, &reckey); |
| 78 | if (argv[3]) { |
| 79 | if (!streq(keystr, argv[3])) |
| 80 | errx(1, "Signature is invalid"); |
| 81 | printf("Signature is valid!\n"); |
| 82 | } else |
| 83 | printf("Signature claims to be from key %s\n", keystr); |
| 84 | return 0; |
| 85 | } |
nothing calls this directly
no test coverage detected