random.c revision 1c9bd843ebc00801cc418156a3893362a1dc872e
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <locale.h>
#include <cryptoutil.h>
#define RANDOM_DEVICE "/dev/urandom" /* random device name */
/*
* Put the requested amount of random data into a preallocated buffer.
* Good for passphrase salts, initialization vectors.
*/
int
pkcs11_random_data(void *dbuf, size_t dlen)
{
int fd;
if (dbuf == NULL || dlen == 0)
return (0);
/* Read random data directly from /dev/urandom */
if ((fd = open(RANDOM_DEVICE, O_RDONLY)) != -1) {
if (read(fd, dbuf, dlen) == dlen) {
(void) close(fd);
return (0);
}
(void) close(fd);
}
return (-1);
}