7ba2b2006c
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@20466 ec53bebd-3082-4978-b11e-865c3cabbd6b
162 lines
3.3 KiB
C
162 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2006 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
RCSID("$Id$");
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <rand.h>
|
|
|
|
#include <roken.h>
|
|
|
|
#include "randi.h"
|
|
|
|
/*
|
|
* Unix /dev/random
|
|
*/
|
|
|
|
static int
|
|
get_device_fd(int flags)
|
|
{
|
|
static const char *rnd_devices[] = {
|
|
"/dev/urandom",
|
|
"/dev/random",
|
|
"/dev/srandom",
|
|
"/dev/arandom",
|
|
NULL
|
|
};
|
|
const char **p;
|
|
|
|
for(p = rnd_devices; *p; p++) {
|
|
int fd = open(*p, flags | O_NDELAY);
|
|
if(fd >= 0)
|
|
return fd;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static void
|
|
unix_seed(const void *indata, int size)
|
|
{
|
|
int fd;
|
|
|
|
if (size <= 0)
|
|
return;
|
|
|
|
fd = get_device_fd(O_WRONLY);
|
|
if (fd < 0)
|
|
return;
|
|
|
|
write(fd, indata, size);
|
|
close(fd);
|
|
|
|
}
|
|
|
|
static int
|
|
unix_bytes(unsigned char *outdata, int size)
|
|
{
|
|
ssize_t count;
|
|
int fd;
|
|
|
|
if (size <= 0)
|
|
return 0;
|
|
|
|
fd = get_device_fd(O_RDONLY);
|
|
if (fd < 0)
|
|
return 0;
|
|
|
|
while (size > 0) {
|
|
count = read (fd, outdata, size);
|
|
if (count < 0 && errno == EINTR)
|
|
continue;
|
|
else if (count <= 0) {
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
outdata += count;
|
|
size -= count;
|
|
}
|
|
close(fd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
unix_cleanup(void)
|
|
{
|
|
}
|
|
|
|
static void
|
|
unix_add(const void *indata, int size, double entropi)
|
|
{
|
|
unix_seed(indata, size);
|
|
}
|
|
|
|
static int
|
|
unix_pseudorand(unsigned char *outdata, int size)
|
|
{
|
|
return unix_bytes(outdata, size);
|
|
}
|
|
|
|
static int
|
|
unix_status(void)
|
|
{
|
|
int fd;
|
|
|
|
fd = get_device_fd(O_RDONLY);
|
|
if (fd < 0)
|
|
return 0;
|
|
close(fd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
const RAND_METHOD hc_rand_unix_method = {
|
|
unix_seed,
|
|
unix_bytes,
|
|
unix_cleanup,
|
|
unix_add,
|
|
unix_pseudorand,
|
|
unix_status
|
|
};
|
|
|
|
const RAND_METHOD *
|
|
RAND_unix_method(void)
|
|
{
|
|
return &hc_rand_unix_method;
|
|
}
|