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      1 /*	$NetBSD: arc4random.h,v 1.4 2025/03/09 18:11:55 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2014 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef	_LIBC_GEN_ARC4RANDOM_H_
     33 #define	_LIBC_GEN_ARC4RANDOM_H_
     34 
     35 #include <stdbool.h>
     36 #include <stdint.h>
     37 
     38 #include "reentrant.h"
     39 
     40 struct crypto_prng {
     41 	uint8_t		state[32];
     42 };
     43 
     44 struct arc4random_prng {
     45 	struct crypto_prng	arc4_prng;
     46 	unsigned		arc4_epoch;
     47 };
     48 
     49 struct arc4random_global_state {
     50 	mutex_t			lock;
     51 	thread_key_t		thread_key;
     52 	struct arc4random_prng	prng;
     53 	once_t			once;
     54 	bool			initialized;
     55 	bool			forksafe;
     56 	bool			per_thread;
     57 };
     58 
     59 #define	arc4random_global	__arc4random_global /* libc private symbol */
     60 
     61 extern struct arc4random_global_state arc4random_global;
     62 
     63 #endif	/* _LIBC_GEN_ARC4RANDOM_H_ */
     64