FreeBSD/Linux Kernel Cross Reference
sys/dev/random/hash.h

     /*-
      * Copyright (c) 2000-2015 Mark R V Murray
      * All rights reserved.
      *
      * 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
     *    in this position and unchanged.
     * 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 ``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 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.
     *
     * $FreeBSD$
     */
    
    #ifndef SYS_DEV_RANDOM_HASH_H_INCLUDED
    #define SYS_DEV_RANDOM_HASH_H_INCLUDED
    
    #include <crypto/chacha20/_chacha.h>
    #include <dev/random/uint128.h>
    
    #ifndef _KERNEL
    #define __read_frequently
    #endif
    
    /* Keys are formed from cipher blocks */
    #define RANDOM_KEYSIZE          32      /* (in bytes) == 256 bits */
    #define RANDOM_KEYSIZE_WORDS    (RANDOM_KEYSIZE/sizeof(uint32_t))
    #define RANDOM_BLOCKSIZE        16      /* (in bytes) == 128 bits */
    #define RANDOM_BLOCKSIZE_WORDS  (RANDOM_BLOCKSIZE/sizeof(uint32_t))
    #define RANDOM_KEYS_PER_BLOCK   (RANDOM_KEYSIZE/RANDOM_BLOCKSIZE)
    
    /* The size of the zero block portion used to form H_d(m) */
    #define RANDOM_ZERO_BLOCKSIZE   64      /* (in bytes) == 512 zero bits */
    
    struct randomdev_hash {
            SHA256_CTX      sha;
    };
    
    union randomdev_key {
            struct {
                    keyInstance key;        /* Key schedule */
                    cipherInstance cipher;  /* Rijndael internal */
            };
            struct chacha_ctx chacha;
    };
    
    extern bool random_chachamode;
    
    void randomdev_hash_init(struct randomdev_hash *);
    void randomdev_hash_iterate(struct randomdev_hash *, const void *, size_t);
    void randomdev_hash_finish(struct randomdev_hash *, void *);
    
    void randomdev_encrypt_init(union randomdev_key *, const void *);
    void randomdev_keystream(union randomdev_key *context, uint128_t *, void *, size_t);
    void randomdev_getkey(union randomdev_key *, const void **, size_t *);
    
    #endif /* SYS_DEV_RANDOM_HASH_H_INCLUDED */

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