FreeBSD/Linux Kernel Cross Reference
sys/dev/random/fenestrasX/fx_rng.h

     /*-
      * 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 *);

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