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4d846d260e
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
53 lines
2.3 KiB
C
53 lines
2.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#pragma once
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#include <sys/systm.h>
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/*
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* The root BRNG seed version, or generation.
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*
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* FenestrasX-aware downstream CSPRNGs (i.e., arc4random(9)) should track the
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* generation number they seeded from, using the read_random_key(9) API below.
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* If their current seed version is older than the root generation, they should
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* reseed before producing output.
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*
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* The variable is read-only outside of the fenestrasX implementation and
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* should be accessed using 'atomic_load_acq_64(&fxrng_root_generation)'.
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* Reseeds are extremely infrequent, so callers may wish to hint to the
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* compiler that a matching generation is the expected case, with
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* __predict_true() or __predict_false().
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*/
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extern uint64_t __read_mostly fxrng_root_generation;
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/*
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* A routine for generating seed/key material
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* Bypasses random(4) for now, but conceivably could be incorporated into that.
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*/
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void read_random_key(void *buf, size_t nbytes, uint64_t *seed_version_out);
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