2 * Copyright (c) 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 #include <heim_threads.h>
49 static int random_fd = -1;
50 static HEIMDAL_MUTEX random_mutex = HEIMDAL_MUTEX_INITIALIZER;
57 get_device_fd(int flags)
59 static const char *rnd_devices[] = {
68 for(p = rnd_devices; *p; p++) {
69 int fd = open(*p, flags | O_NDELAY);
79 unix_seed(const void *indata, int size)
86 fd = get_device_fd(O_WRONLY);
90 write(fd, indata, size);
97 unix_bytes(unsigned char *outdata, int size)
105 HEIMDAL_MUTEX_lock(&random_mutex);
106 if (random_fd == -1) {
108 random_fd = get_device_fd(O_RDONLY);
110 HEIMDAL_MUTEX_unlock(&random_mutex);
116 HEIMDAL_MUTEX_unlock(&random_mutex);
117 count = read (random_fd, outdata, size);
118 HEIMDAL_MUTEX_lock(&random_mutex);
122 else if (errno == EBADF && once++ == 0) {
128 } else if (count <= 0) {
129 HEIMDAL_MUTEX_unlock(&random_mutex);
135 HEIMDAL_MUTEX_unlock(&random_mutex);
146 unix_add(const void *indata, int size, double entropi)
148 unix_seed(indata, size);
152 unix_pseudorand(unsigned char *outdata, int size)
154 return unix_bytes(outdata, size);
162 fd = get_device_fd(O_RDONLY);
170 const RAND_METHOD hc_rand_unix_method = {
180 RAND_unix_method(void)
182 return &hc_rand_unix_method;