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diff --git a/src/grp-journal/libjournal-core/test-journal-verify.c b/src/grp-journal/libjournal-core/test-journal-verify.c
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+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "fd-util.h"
+#include "journal-file.h"
+#include "journal-verify.h"
+#include "log.h"
+#include "rm-rf.h"
+#include "terminal-util.h"
+#include "util.h"
+
+#define N_ENTRIES 6000
+#define RANDOM_RANGE 77
+
+static void bit_toggle(const char *fn, uint64_t p) {
+ uint8_t b;
+ ssize_t r;
+ int fd;
+
+ fd = open(fn, O_RDWR|O_CLOEXEC);
+ assert_se(fd >= 0);
+
+ r = pread(fd, &b, 1, p/8);
+ assert_se(r == 1);
+
+ b ^= 1 << (p % 8);
+
+ r = pwrite(fd, &b, 1, p/8);
+ assert_se(r == 1);
+
+ safe_close(fd);
+}
+
+static int raw_verify(const char *fn, const char *verification_key) {
+ JournalFile *f;
+ int r;
+
+ r = journal_file_open(-1, fn, O_RDONLY, 0666, true, !!verification_key, NULL, NULL, NULL, NULL, &f);
+ if (r < 0)
+ return r;
+
+ r = journal_file_verify(f, verification_key, NULL, NULL, NULL, false);
+ (void) journal_file_close(f);
+
+ return r;
+}
+
+int main(int argc, char *argv[]) {
+ char t[] = "/tmp/journal-XXXXXX";
+ unsigned n;
+ JournalFile *f;
+ const char *verification_key = argv[1];
+ usec_t from = 0, to = 0, total = 0;
+ char a[FORMAT_TIMESTAMP_MAX];
+ char b[FORMAT_TIMESTAMP_MAX];
+ char c[FORMAT_TIMESPAN_MAX];
+ struct stat st;
+ uint64_t p;
+
+ /* journal_file_open requires a valid machine id */
+ if (access("/etc/machine-id", F_OK) != 0)
+ return EXIT_TEST_SKIP;
+
+ log_set_max_level(LOG_DEBUG);
+
+ assert_se(mkdtemp(t));
+ assert_se(chdir(t) >= 0);
+
+ log_info("Generating...");
+
+ assert_se(journal_file_open(-1, "test.journal", O_RDWR|O_CREAT, 0666, true, !!verification_key, NULL, NULL, NULL, NULL, &f) == 0);
+
+ for (n = 0; n < N_ENTRIES; n++) {
+ struct iovec iovec;
+ struct dual_timestamp ts;
+ char *test;
+
+ dual_timestamp_get(&ts);
+
+ assert_se(asprintf(&test, "RANDOM=%lu", random() % RANDOM_RANGE));
+
+ iovec.iov_base = (void*) test;
+ iovec.iov_len = strlen(test);
+
+ assert_se(journal_file_append_entry(f, &ts, &iovec, 1, NULL, NULL, NULL) == 0);
+
+ free(test);
+ }
+
+ (void) journal_file_close(f);
+
+ log_info("Verifying...");
+
+ assert_se(journal_file_open(-1, "test.journal", O_RDONLY, 0666, true, !!verification_key, NULL, NULL, NULL, NULL, &f) == 0);
+ /* journal_file_print_header(f); */
+ journal_file_dump(f);
+
+ assert_se(journal_file_verify(f, verification_key, &from, &to, &total, true) >= 0);
+
+ if (verification_key && JOURNAL_HEADER_SEALED(f->header))
+ log_info("=> Validated from %s to %s, %s missing",
+ format_timestamp(a, sizeof(a), from),
+ format_timestamp(b, sizeof(b), to),
+ format_timespan(c, sizeof(c), total > to ? total - to : 0, 0));
+
+ (void) journal_file_close(f);
+
+ if (verification_key) {
+ log_info("Toggling bits...");
+
+ assert_se(stat("test.journal", &st) >= 0);
+
+ for (p = 38448*8+0; p < ((uint64_t) st.st_size * 8); p ++) {
+ bit_toggle("test.journal", p);
+
+ log_info("[ %"PRIu64"+%"PRIu64"]", p / 8, p % 8);
+
+ if (raw_verify("test.journal", verification_key) >= 0)
+ log_notice(ANSI_HIGHLIGHT_RED ">>>> %"PRIu64" (bit %"PRIu64") can be toggled without detection." ANSI_NORMAL, p / 8, p % 8);
+
+ bit_toggle("test.journal", p);
+ }
+ }
+
+ log_info("Exiting...");
+
+ assert_se(rm_rf(t, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
+
+ return 0;
+}