projects / thirdparty / systemd.git / blame
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|---|---|---|
| d9215cd8 ZJS |
1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
| 2 | ||
| 7560fffc LP |
3 | #ifndef __fsprgh__ |
| 4 | #define __fsprgh__ | |
| 5 | ||
| 6 | /* | |
| 7 | * fsprg v0.1 - (seekable) forward-secure pseudorandom generator | |
| 810adae9 | 8 | * Copyright © 2012 B. Poettering |
| 7560fffc LP |
9 | * Contact: fsprg@point-at-infinity.org |
| 10 | * | |
| 11 | * This library is free software; you can redistribute it and/or | |
| 12 | * modify it under the terms of the GNU Lesser General Public | |
| 13 | * License as published by the Free Software Foundation; either | |
| 14 | * version 2.1 of the License, or (at your option) any later version. | |
| 15 | * | |
| 16 | * This library is distributed in the hope that it will be useful, | |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 19 | * Lesser General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU Lesser General Public | |
| 22 | * License along with this library; if not, write to the Free Software | |
| 23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
| 24 | * 02110-1301 USA | |
| 7560fffc LP |
25 | */ |
| 26 | ||
| 7560fffc | 27 | #include <inttypes.h> |
| 71d35b6b | 28 | #include <sys/types.h> |
| 7560fffc | 29 | |
| 44a6b1b6 | 30 | #include "macro.h" |
| 7d50b32a | 31 | #include "util.h" |
| 44a6b1b6 | 32 | |
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33 | #ifdef __cplusplus |
| 34 | extern "C" { | |
| 35 | #endif | |
| 36 | ||
| 37 | #define FSPRG_RECOMMENDED_SECPAR 1536 | |
| 38 | #define FSPRG_RECOMMENDED_SEEDLEN (96/8) | |
| 39 | ||
| 44a6b1b6 ZJS |
40 | size_t FSPRG_mskinbytes(unsigned secpar) _const_; |
| 41 | size_t FSPRG_mpkinbytes(unsigned secpar) _const_; | |
| 42 | size_t FSPRG_stateinbytes(unsigned secpar) _const_; | |
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43 | |
| 44 | /* Setup msk and mpk. Providing seed != NULL makes this algorithm deterministic. */ | |
| 45 | void FSPRG_GenMK(void *msk, void *mpk, const void *seed, size_t seedlen, unsigned secpar); | |
| 46 | ||
| 47 | /* Initialize state deterministically in dependence on seed. */ | |
| 48 | /* Note: in case one wants to run only one GenState0 per GenMK it is safe to use | |
| 49 | the same seed for both GenMK and GenState0. | |
| 50 | */ | |
| 51 | void FSPRG_GenState0(void *state, const void *mpk, const void *seed, size_t seedlen); | |
| 52 | ||
| 53 | void FSPRG_Evolve(void *state); | |
| 54 | ||
| 44a6b1b6 | 55 | uint64_t FSPRG_GetEpoch(const void *state) _pure_; |
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56 | |
| 57 | /* Seek to any arbitrary state (by providing msk together with seed from GenState0). */ | |
| 58 | void FSPRG_Seek(void *state, uint64_t epoch, const void *msk, const void *seed, size_t seedlen); | |
| 59 | ||
| 60 | void FSPRG_GetKey(const void *state, void *key, size_t keylen, uint32_t idx); | |
| 61 | ||
| 62 | #ifdef __cplusplus | |
| 63 | } | |
| 64 | #endif | |
| 65 | ||
| 66 | #endif |