/*- * 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 *); |