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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
7a3c343c | 2 | #pragma once |
7560fffc LP |
3 | |
4 | /* | |
5 | * fsprg v0.1 - (seekable) forward-secure pseudorandom generator | |
810adae9 | 6 | * Copyright © 2012 B. Poettering |
7560fffc | 7 | * Contact: fsprg@point-at-infinity.org |
7560fffc LP |
8 | */ |
9 | ||
7560fffc | 10 | #include <inttypes.h> |
71d35b6b | 11 | #include <sys/types.h> |
7560fffc | 12 | |
44a6b1b6 ZJS |
13 | #include "macro.h" |
14 | ||
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15 | #ifdef __cplusplus |
16 | extern "C" { | |
17 | #endif | |
18 | ||
19 | #define FSPRG_RECOMMENDED_SECPAR 1536 | |
20 | #define FSPRG_RECOMMENDED_SEEDLEN (96/8) | |
21 | ||
44a6b1b6 ZJS |
22 | size_t FSPRG_mskinbytes(unsigned secpar) _const_; |
23 | size_t FSPRG_mpkinbytes(unsigned secpar) _const_; | |
24 | size_t FSPRG_stateinbytes(unsigned secpar) _const_; | |
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25 | |
26 | /* Setup msk and mpk. Providing seed != NULL makes this algorithm deterministic. */ | |
8707c9b2 | 27 | int FSPRG_GenMK(void *msk, void *mpk, const void *seed, size_t seedlen, unsigned secpar); |
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28 | |
29 | /* Initialize state deterministically in dependence on seed. */ | |
30 | /* Note: in case one wants to run only one GenState0 per GenMK it is safe to use | |
31 | the same seed for both GenMK and GenState0. | |
32 | */ | |
8707c9b2 | 33 | int FSPRG_GenState0(void *state, const void *mpk, const void *seed, size_t seedlen); |
7560fffc | 34 | |
8707c9b2 | 35 | int FSPRG_Evolve(void *state); |
7560fffc | 36 | |
44a6b1b6 | 37 | uint64_t FSPRG_GetEpoch(const void *state) _pure_; |
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38 | |
39 | /* Seek to any arbitrary state (by providing msk together with seed from GenState0). */ | |
8707c9b2 | 40 | int FSPRG_Seek(void *state, uint64_t epoch, const void *msk, const void *seed, size_t seedlen); |
7560fffc | 41 | |
8707c9b2 | 42 | int FSPRG_GetKey(const void *state, void *key, size_t keylen, uint32_t idx); |
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43 | |
44 | #ifdef __cplusplus | |
45 | } | |
46 | #endif |