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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
72 lines
2.7 KiB
C
72 lines
2.7 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 <crypto/chacha20/chacha.h>
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#include <dev/random/fenestrasX/fx_priv.h>
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#define FX_CHACHA20_KEYSIZE 32
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struct fxrng_basic_rng {
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struct mtx rng_lk;
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#define FXRNG_RNG_LOCK(rng) mtx_lock(&(rng)->rng_lk)
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#define FXRNG_RNG_UNLOCK(rng) mtx_unlock(&(rng)->rng_lk)
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#define FXRNG_RNG_ASSERT(rng) mtx_assert(&(rng)->rng_lk, MA_OWNED)
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#define FXRNG_RNG_ASSERT_NOT(rng) mtx_assert(&(rng)->rng_lk, MA_NOTOWNED)
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/* CTR-mode cipher state, including 128-bit embedded counter. */
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struct chacha_ctx rng_prf;
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};
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/*
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* Initialize a basic rng instance (half of a buffered FX BRNG).
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* Memory should be zero initialized before this routine.
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*/
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static inline void
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fxrng_rng_init(struct fxrng_basic_rng *rng, bool is_root_rng)
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{
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if (is_root_rng)
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mtx_init(&rng->rng_lk, "fx root brng lk", NULL, MTX_DEF);
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else
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mtx_init(&rng->rng_lk, "fx pcpu brng lk", NULL, MTX_DEF);
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}
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static inline void
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fxrng_rng_setkey(struct fxrng_basic_rng *rng, const void *newkey, size_t len)
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{
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ASSERT_DEBUG(len == FX_CHACHA20_KEYSIZE, "chacha20 uses 256 bit keys");
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chacha_keysetup(&rng->rng_prf, newkey, len * 8);
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}
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void fxrng_rng_genrandom_internal(struct fxrng_basic_rng *, void *, size_t,
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bool return_unlocked);
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void fxrng_rng_reseed(struct fxrng_basic_rng *, bool seeded, const void *,
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size_t);
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void fxrng_rng_src_reseed(struct fxrng_basic_rng *,
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const struct harvest_event *);
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