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/*
* Copyright (c) 2006 - 2007 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: rand.c 20126 2007-02-01 22:08:41Z lha $");
#include <stdio.h>
#include <stdlib.h>
#include <rand.h>
#include <randi.h>
#include <roken.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
const static RAND_METHOD *selected_meth = NULL;
static void
init_method(void)
{
if (selected_meth != NULL)
return;
if ((*hc_rand_unix_method.status)() == 1)
selected_meth = &hc_rand_unix_method;
else
selected_meth = &hc_rand_fortuna_method;
}
void
RAND_seed(const void *indata, size_t size)
{
init_method();
(*selected_meth->seed)(indata, size);
}
int
RAND_bytes(void *outdata, size_t size)
{
init_method();
return (*selected_meth->bytes)(outdata, size);
}
void
RAND_cleanup(void)
{
init_method();
(*selected_meth->cleanup)();
}
void
RAND_add(const void *indata, size_t size, double entropi)
{
init_method();
(*selected_meth->add)(indata, size, entropi);
}
int
RAND_pseudo_bytes(void *outdata, size_t size)
{
init_method();
return (*selected_meth->pseudorand)(outdata, size);
}
int
RAND_status(void)
{
init_method();
return (*selected_meth->status)();
}
int
RAND_set_rand_method(const RAND_METHOD *meth)
{
selected_meth = meth;
return 1;
}
const RAND_METHOD *
RAND_get_rand_method(void)
{
return selected_meth;
}
int
RAND_set_rand_engine(ENGINE *engine)
{
return 1;
}
#define RAND_FILE_SIZE 1024
int
RAND_load_file(const char *filename, size_t size)
{
unsigned char buf[128];
size_t len;
ssize_t slen;
int fd;
fd = open(filename, O_RDONLY | O_BINARY, 0600);
if (fd < 0)
return 0;
len = 0;
while(len < size) {
slen = read(fd, buf, sizeof(buf));
if (slen <= 0)
break;
RAND_seed(buf, slen);
len += slen;
}
close(fd);
return len ? 1 : 0;
}
int
RAND_write_file(const char *filename)
{
unsigned char buf[128];
size_t len;
int res = 0, fd;
fd = open(filename, O_WRONLY | O_CREAT | O_BINARY, 0600);
if (fd < 0)
return 0;
len = 0;
while(len < RAND_FILE_SIZE) {
res = RAND_bytes(buf, sizeof(buf));
if (res != 1)
break;
if (write(fd, buf, sizeof(buf)) != sizeof(buf)) {
res = 0;
break;
}
len += sizeof(buf);
}
close(fd);
return res;
}
const char *
RAND_file_name(char *filename, size_t size)
{
const char *e = NULL;
int pathp = 0, ret;
if (!issuid()) {
e = getenv("RANDFILE");
if (e == NULL) {
e = getenv("HOME");
if (e)
pathp = 1;
}
}
if (e == NULL) {
struct passwd *pw = getpwuid(getuid());
if (pw) {
e = pw->pw_dir;
pathp = 1;
}
}
if (e == NULL)
return NULL;
if (pathp)
ret = snprintf(filename, size, "%s/.rnd", e);
else
ret = snprintf(filename, size, "%s", e);
if (ret <= 0 || ret >= size)
return NULL;
return filename;
}
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