+#define FSPRG_HEADER_SIGNATURE ((char[]) { 'K', 'S', 'H', 'H', 'R', 'H', 'L', 'P' })
+
+_packed_ struct FSPRGHeader {
+ uint8_t signature[8]; /* "KSHHRHLP" */
+ le32_t compatible_flags;
+ le32_t incompatible_flags;
+ sd_id128_t machine_id;
+ sd_id128_t boot_id; /* last writer */
+ le64_t header_size;
+ le64_t fsprg_start_usec;
+ le64_t fsprg_interval_usec;
+ le16_t secpar;
+ le16_t reserved[3];
+ le64_t state_size;
+};