| #ifndef __fsprgh__ |
| #define __fsprgh__ |
| |
| /* |
| * fsprg v0.1 - (seekable) forward-secure pseudorandom generator |
| * Copyright (C) 2012 B. Poettering |
| * Contact: fsprg@point-at-infinity.org |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| * |
| */ |
| |
| #include <inttypes.h> |
| #include <sys/types.h> |
| |
| #include "macro.h" |
| #include "util.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #define FSPRG_RECOMMENDED_SECPAR 1536 |
| #define FSPRG_RECOMMENDED_SEEDLEN (96/8) |
| |
| size_t FSPRG_mskinbytes(unsigned secpar) _const_; |
| size_t FSPRG_mpkinbytes(unsigned secpar) _const_; |
| size_t FSPRG_stateinbytes(unsigned secpar) _const_; |
| |
| /* Setup msk and mpk. Providing seed != NULL makes this algorithm deterministic. */ |
| void FSPRG_GenMK(void *msk, void *mpk, const void *seed, size_t seedlen, unsigned secpar); |
| |
| /* Initialize state deterministically in dependence on seed. */ |
| /* Note: in case one wants to run only one GenState0 per GenMK it is safe to use |
| the same seed for both GenMK and GenState0. |
| */ |
| void FSPRG_GenState0(void *state, const void *mpk, const void *seed, size_t seedlen); |
| |
| void FSPRG_Evolve(void *state); |
| |
| uint64_t FSPRG_GetEpoch(const void *state) _pure_; |
| |
| /* Seek to any arbitrary state (by providing msk together with seed from GenState0). */ |
| void FSPRG_Seek(void *state, uint64_t epoch, const void *msk, const void *seed, size_t seedlen); |
| |
| void FSPRG_GetKey(const void *state, void *key, size_t keylen, uint32_t idx); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |