Rusty Russell
9 years ago
2 changed files with 58 additions and 1 deletions
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#include <ccan/crypto/shachain/shachain.h> |
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#include <ccan/short_types/short_types.h> |
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#include <ccan/tal/tal.h> |
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#include <ccan/opt/opt.h> |
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#include <ccan/str/hex/hex.h> |
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#include <ccan/err/err.h> |
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#include <ccan/read_write_all/read_write_all.h> |
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#include "lightning.pb-c.h" |
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#include "protobuf_convert.h" |
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#include "pkt.h" |
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#include <unistd.h> |
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int main(int argc, char *argv[]) |
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{ |
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const tal_t *ctx = tal_arr(NULL, char, 0); |
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struct sha256 secret; |
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Pkt *pkt; |
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Sha256Hash *preimage; |
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char hexstr[hex_str_size(sizeof(secret))]; |
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err_set_progname(argv[0]); |
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opt_register_noarg("--help|-h", opt_usage_and_exit, |
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"<update-sig-or-update-complete>\n" |
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"Extract revocation preimage from message", |
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"Print this message."); |
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opt_parse(&argc, argv, opt_log_stderr_exit); |
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if (argc != 2) |
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opt_usage_exit_fail("Expected 1 argument"); |
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pkt = any_pkt_from_file(argv[1]); |
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switch (pkt->pkt_case) { |
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case PKT__PKT_UPDATE_SIGNATURE: |
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preimage = pkt->update_signature->revocation_preimage; |
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break; |
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case PKT__PKT_UPDATE_COMPLETE: |
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preimage = pkt->update_complete->revocation_preimage; |
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break; |
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default: |
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errx(1, "Unexpected packet type %u in %s", |
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pkt->pkt_case, argv[1]); |
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} |
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proto_to_sha256(preimage, &secret); |
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if (!hex_encode(&secret, sizeof(secret), hexstr, sizeof(hexstr))) |
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abort(); |
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if (!write_all(STDOUT_FILENO, hexstr, strlen(hexstr))) |
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err(1, "Writing out hexstr"); |
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tal_free(ctx); |
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return 0; |
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} |
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