FreeBSD/Linux Kernel Cross Reference
sys/dev/random/fenestrasX/fx_hash.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_priv.h>
    #define blake2b_init    blake2b_init_ref
    #define blake2b_update  blake2b_update_ref
    #define blake2b_final   blake2b_final_ref
    #include <contrib/libb2/blake2.h>
    
    #define FXRNG_HASH_SZ   BLAKE2B_OUTBYTES        /* 64 */
    
    /*
     * Wrappers for hash function abstraction.
     */
    struct fxrng_hash {
            blake2b_state   state;
    };
    
    static inline void
    fxrng_hash_init(struct fxrng_hash *h)
    {
            int rc;
    
            rc = blake2b_init(&h->state, FXRNG_HASH_SZ);
            ASSERT(rc == 0, "blake2b_init");
    }
    
    static inline void
    fxrng_hash_update(struct fxrng_hash *h, const void *buf, size_t sz)
    {
            int rc;
    
            rc = blake2b_update(&h->state, buf, sz);
            ASSERT(rc == 0, "blake2b_update");
    }
    
    static inline void
    fxrng_hash_finish(struct fxrng_hash *h, uint8_t buf[static FXRNG_HASH_SZ], size_t sz)
    {
            int rc;
    
            rc = blake2b_final(&h->state, buf, sz);
            ASSERT(rc == 0, "blake2b_final(sz=%zu)", sz);
            explicit_bzero(h, sizeof(*h));
    }

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