+
+
+int journal_file_parse_verification_key(JournalFile *f, const char *key) {
+ uint8_t *seed;
+ size_t seed_size, c;
+ const char *k;
+ int r;
+ unsigned long long start, interval;
+
+ seed_size = FSPRG_RECOMMENDED_SEEDLEN;
+ seed = malloc(seed_size);
+ if (!seed)
+ return -ENOMEM;
+
+ k = key;
+ for (c = 0; c < seed_size; c++) {
+ int x, y;
+
+ while (*k == '-')
+ k++;
+
+ x = unhexchar(*k);
+ if (x < 0) {
+ free(seed);
+ return -EINVAL;
+ }
+ k++;
+ y = unhexchar(*k);
+ if (y < 0) {
+ free(seed);
+ return -EINVAL;
+ }
+ k++;
+
+ seed[c] = (uint8_t) (x * 16 + y);
+ }
+
+ if (*k != '/') {
+ free(seed);
+ return -EINVAL;
+ }
+ k++;
+
+ r = sscanf(k, "%llx-%llx", &start, &interval);
+ if (r != 2) {
+ free(seed);
+ return -EINVAL;
+ }
+
+ f->fsprg_seed = seed;
+ f->fsprg_seed_size = seed_size;
+
+ f->fss_start_usec = start * interval;
+ f->fss_interval_usec = interval;
+
+ return 0;
+}
+
+bool journal_file_next_evolve_usec(JournalFile *f, usec_t *u) {
+ uint64_t epoch;
+
+ assert(f);
+ assert(u);
+
+ if (!f->seal)
+ return false;
+
+ epoch = FSPRG_GetEpoch(f->fsprg_state);
+
+ *u = (usec_t) (f->fss_start_usec + f->fss_interval_usec * epoch + f->fss_interval_usec);
+
+ return true;
+}