1/* 2 * Copyright (c) 2006 Kungliga Tekniska Högskolan 3 * (Royal Institute of Technology, Stockholm, Sweden). 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * 3. Neither the name of the Institute nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#include <config.h> 35 36#include <stdio.h> 37#include <stdlib.h> 38#include <rand.h> 39#include <heim_threads.h> 40 41#include <roken.h> 42 43#include "randi.h" 44 45#ifdef __APPLE_TARGET_EMBEDDED__ 46 47/* 48 * Unix /dev/random 49 */ 50 51int 52_hc_unix_device_fd(int flags, const char **fn) 53{ 54 static const char *rnd_devices[] = { 55 "/dev/urandom", 56 "/dev/random", 57 "/dev/srandom", 58 "/dev/arandom", 59 NULL 60 }; 61 const char **p; 62 63 for(p = rnd_devices; *p; p++) { 64 int fd = open(*p, flags | O_NDELAY); 65 if(fd >= 0) { 66 if (fn) 67 *fn = *p; 68 rk_cloexec(fd); 69 return fd; 70 } 71 } 72 return -1; 73} 74 75static void 76unix_seed(const void *indata, int size) 77{ 78 int fd; 79 80 if (size <= 0) 81 return; 82 83 fd = _hc_unix_device_fd(O_WRONLY, NULL); 84 if (fd < 0) 85 return; 86 87 write(fd, indata, size); 88 close(fd); 89 90} 91 92 93static int 94unix_bytes(unsigned char *outdata, int size) 95{ 96 ssize_t count; 97 int fd; 98 99 if (size < 0) 100 return 0; 101 else if (size == 0) 102 return 1; 103 104 fd = _hc_unix_device_fd(O_RDONLY, NULL); 105 if (fd < 0) 106 return 0; 107 108 while (size > 0) { 109 count = read(fd, outdata, size); 110 if (count < 0 && errno == EINTR) 111 continue; 112 else if (count <= 0) { 113 close(fd); 114 return 0; 115 } 116 outdata += count; 117 size -= count; 118 } 119 close(fd); 120 121 return 1; 122} 123 124static void 125unix_cleanup(void) 126{ 127} 128 129static void 130unix_add(const void *indata, int size, double entropi) 131{ 132 unix_seed(indata, size); 133} 134 135static int 136unix_pseudorand(unsigned char *outdata, int size) 137{ 138 return unix_bytes(outdata, size); 139} 140 141static int 142unix_status(void) 143{ 144 int fd; 145 146 fd = _hc_unix_device_fd(O_RDONLY, NULL); 147 if (fd < 0) 148 return 0; 149 close(fd); 150 151 return 1; 152} 153 154const RAND_METHOD hc_rand_unix_method = { 155 unix_seed, 156 unix_bytes, 157 unix_cleanup, 158 unix_add, 159 unix_pseudorand, 160 unix_status 161}; 162 163const RAND_METHOD * 164RAND_unix_method(void) 165{ 166 return &hc_rand_unix_method; 167} 168 169#endif 170