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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#pragma once
#include <crypto/chacha20/chacha.h>
#include <dev/random/fenestrasX/fx_priv.h>
#define FX_CHACHA20_KEYSIZE 32
struct fxrng_basic_rng {
struct mtx rng_lk;
#define FXRNG_RNG_LOCK(rng) mtx_lock(&(rng)->rng_lk)
#define FXRNG_RNG_UNLOCK(rng) mtx_unlock(&(rng)->rng_lk)
#define FXRNG_RNG_ASSERT(rng) mtx_assert(&(rng)->rng_lk, MA_OWNED)
#define FXRNG_RNG_ASSERT_NOT(rng) mtx_assert(&(rng)->rng_lk, MA_NOTOWNED)
/* CTR-mode cipher state, including 128-bit embedded counter. */
struct chacha_ctx rng_prf;
};
/*
* Initialize a basic rng instance (half of a buffered FX BRNG).
* Memory should be zero initialized before this routine.
*/
static inline void
fxrng_rng_init(struct fxrng_basic_rng *rng, bool is_root_rng)
{
if (is_root_rng)
mtx_init(&rng->rng_lk, "fx root brng lk", NULL, MTX_DEF);
else
mtx_init(&rng->rng_lk, "fx pcpu brng lk", NULL, MTX_DEF);
}
static inline void
fxrng_rng_setkey(struct fxrng_basic_rng *rng, const void *newkey, size_t len)
{
ASSERT_DEBUG(len == FX_CHACHA20_KEYSIZE, "chacha20 uses 256 bit keys");
chacha_keysetup(&rng->rng_prf, newkey, len * 8);
}
void fxrng_rng_genrandom_internal(struct fxrng_basic_rng *, void *, size_t,
bool return_unlocked);
void fxrng_rng_reseed(struct fxrng_basic_rng *, bool seeded, const void *,
size_t);
void fxrng_rng_src_reseed(struct fxrng_basic_rng *,
const struct harvest_event *);
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