FreeBSD/Linux Kernel Cross Reference
sys/dev/random/fenestrasX/fx_brng.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 <dev/random/fenestrasX/fx_rng.h>
    
    #define FXRNG_BUFRNG_SZ 128
    
    /*
     * An object representing a buffered random number generator with forward
     * secrecy (aka "fast-key-erasure").
     *
     * There is a single static root instance of this object associated with the
     * entropy harvester, as well as additional instances per CPU, lazily allocated
     * in NUMA-local memory, seeded from output of the root generator.
     */
    struct fxrng_buffered_rng {
            struct fxrng_basic_rng  brng_rng;
    #define FXRNG_BRNG_LOCK(brng)   mtx_lock(&(brng)->brng_rng.rng_lk)
    #define FXRNG_BRNG_UNLOCK(brng) mtx_unlock(&(brng)->brng_rng.rng_lk)
    #define FXRNG_BRNG_ASSERT(brng) mtx_assert(&(brng)->brng_rng.rng_lk, MA_OWNED)
    #define FXRNG_BRNG_ASSERT_NOT(brng) \
            mtx_assert(&(brng)->brng_rng.rng_lk, MA_NOTOWNED)
    
            /* Entropy reseed generation ("seed version"). */
            uint64_t        brng_generation;
    
            /* Buffered output for quick access by small requests. */
            uint8_t         brng_buffer[FXRNG_BUFRNG_SZ];
            uint8_t         brng_avail_idx;
    };
    
    void fxrng_brng_init(struct fxrng_buffered_rng *);
    void fxrng_brng_produce_seed_data_internal(struct fxrng_buffered_rng *, void *,
        size_t, uint64_t *seed_generation);
    void fxrng_brng_read(struct fxrng_buffered_rng *, void *, size_t);
    
    void fxrng_brng_reseed(const void *, size_t);
    struct harvest_event;
    void fxrng_brng_src_reseed(const struct harvest_event *);

Cache object: 47d0d2e478d9b9211e7cadbf5a53fa32