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git.ipfire.org Git - thirdparty/systemd.git/blob - src/libsystemd/sd-journal/fsprg.h
f65c5f9e06aa62f52a5c5069895f41612910976a
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
5 * fsprg v0.1 - (seekable) forward-secure pseudorandom generator
6 * Copyright © 2012 B. Poettering
7 * Contact: fsprg@point-at-infinity.org
16 #define FSPRG_RECOMMENDED_SECPAR 1536
17 #define FSPRG_RECOMMENDED_SEEDLEN (96/8)
19 size_t FSPRG_mskinbytes(unsigned secpar
) _const_
;
20 size_t FSPRG_mpkinbytes(unsigned secpar
) _const_
;
21 size_t FSPRG_stateinbytes(unsigned secpar
) _const_
;
23 /* Setup msk and mpk. Providing seed != NULL makes this algorithm deterministic. */
24 int FSPRG_GenMK(void *msk
, void *mpk
, const void *seed
, size_t seedlen
, unsigned secpar
);
26 /* Initialize state deterministically in dependence on seed. */
27 /* Note: in case one wants to run only one GenState0 per GenMK it is safe to use
28 the same seed for both GenMK and GenState0.
30 int FSPRG_GenState0(void *state
, const void *mpk
, const void *seed
, size_t seedlen
);
32 int FSPRG_Evolve(void *state
);
34 uint64_t FSPRG_GetEpoch(const void *state
) _pure_
;
36 /* Seek to any arbitrary state (by providing msk together with seed from GenState0). */
37 int FSPRG_Seek(void *state
, uint64_t epoch
, const void *msk
, const void *seed
, size_t seedlen
);
39 int FSPRG_GetKey(const void *state
, void *key
, size_t keylen
, uint32_t idx
);