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head/sys/dev/random/fenestrasX/fx_rng.h
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svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* 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 *); |