1 /*- 2 * Copyright (c) 2012 Alistair Crooks <agc@NetBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 #include <sys/types.h> 26 #include <sys/param.h> 27 28 #ifdef _KERNEL 29 # include <sys/kmem.h> 30 #else 31 # include <arpa/inet.h> 32 # include <ctype.h> 33 # include <inttypes.h> 34 # include <stdarg.h> 35 # include <stdio.h> 36 # include <stdlib.h> 37 # include <string.h> 38 # include <time.h> 39 # include <unistd.h> 40 #endif 41 42 #include "rand.h" 43 44 int 45 RAND_bytes(unsigned char *buf, int num) 46 { 47 uint32_t r; 48 size_t cc; 49 int i; 50 51 if (buf == NULL || num < 0) { 52 return 0; 53 } 54 for (i = 0 ; i < num ; i += sizeof(r)) { 55 r = arc4random(); 56 cc = MIN(sizeof(r), (size_t)(num - i)); 57 (void) memcpy(&buf[i], &r, cc); 58 } 59 return 1; 60 } 61