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2e36affb77
Give the revocation secret (or hash) for a given index number. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#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 <unistd.h>
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int main(int argc, char *argv[])
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{
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struct sha256 seed, secret;
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bool do_hash = false;
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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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"<seed> <index>\n"
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"A test program to output secret or hash to stdout.",
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"Print this message.");
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opt_register_noarg("--hash", opt_set_bool, &do_hash,
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"Output hash instead of secret itself");
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opt_parse(&argc, argv, opt_log_stderr_exit);
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if (argc != 3)
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opt_usage_exit_fail("Expected 2 arguments");
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if (!hex_decode(argv[1], strlen(argv[1]), &seed, sizeof(seed)))
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errx(1, "Invalid seed '%s' - need 256 hex bits", argv[1]);
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/* Get the given revoction secret. */
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shachain_from_seed(&seed, atoi(argv[2]), &secret);
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if (do_hash)
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sha256(&secret, secret.u.u8, sizeof(secret.u.u8));
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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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return 0;
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}
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