1 1.4 riastrad /* $NetBSD: random.h,v 1.4 2021/12/19 11:49:12 riastradh Exp $ */ 2 1.2 riastrad 3 1.2 riastrad /*- 4 1.2 riastrad * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 1.2 riastrad * All rights reserved. 6 1.2 riastrad * 7 1.2 riastrad * This code is derived from software contributed to The NetBSD Foundation 8 1.2 riastrad * by Taylor R. Campbell. 9 1.2 riastrad * 10 1.2 riastrad * Redistribution and use in source and binary forms, with or without 11 1.2 riastrad * modification, are permitted provided that the following conditions 12 1.2 riastrad * are met: 13 1.2 riastrad * 1. Redistributions of source code must retain the above copyright 14 1.2 riastrad * notice, this list of conditions and the following disclaimer. 15 1.2 riastrad * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 riastrad * notice, this list of conditions and the following disclaimer in the 17 1.2 riastrad * documentation and/or other materials provided with the distribution. 18 1.2 riastrad * 19 1.2 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 riastrad * POSSIBILITY OF SUCH DAMAGE. 30 1.2 riastrad */ 31 1.2 riastrad 32 1.2 riastrad #ifndef _LINUX_RANDOM_H_ 33 1.2 riastrad #define _LINUX_RANDOM_H_ 34 1.2 riastrad 35 1.2 riastrad #include <sys/cprng.h> 36 1.2 riastrad 37 1.2 riastrad static inline int 38 1.2 riastrad get_random_int(void) 39 1.2 riastrad { 40 1.2 riastrad int v; 41 1.2 riastrad 42 1.2 riastrad cprng_strong(kern_cprng, &v, sizeof v, 0); 43 1.2 riastrad 44 1.2 riastrad return v; 45 1.2 riastrad } 46 1.2 riastrad 47 1.2 riastrad static inline long 48 1.2 riastrad get_random_long(void) 49 1.2 riastrad { 50 1.2 riastrad long v; 51 1.2 riastrad 52 1.2 riastrad cprng_strong(kern_cprng, &v, sizeof v, 0); 53 1.2 riastrad 54 1.2 riastrad return v; 55 1.2 riastrad } 56 1.2 riastrad 57 1.3 riastrad static inline uint32_t 58 1.3 riastrad get_random_u32(void) 59 1.3 riastrad { 60 1.3 riastrad uint32_t v; 61 1.3 riastrad 62 1.3 riastrad cprng_strong(kern_cprng, &v, sizeof v, 0); 63 1.3 riastrad 64 1.3 riastrad return v; 65 1.3 riastrad } 66 1.3 riastrad 67 1.4 riastrad static inline uint32_t 68 1.4 riastrad prandom_u32_max(uint32_t bound) 69 1.4 riastrad { 70 1.4 riastrad uint32_t v, min; 71 1.4 riastrad 72 1.4 riastrad min = (-bound) % bound; 73 1.4 riastrad do { 74 1.4 riastrad v = get_random_u32(); 75 1.4 riastrad } while (v < min); 76 1.4 riastrad 77 1.4 riastrad return v % bound; 78 1.4 riastrad } 79 1.4 riastrad 80 1.2 riastrad #endif /* _LINUX_RANDOM_H_ */ 81
Indexes created Mon Sep 22 21:09:42 GMT 2025