| /* |
| * Copyright (c) 1999-2000 Damien Miller. 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. All advertising materials mentioning features or use of this software |
| * must display the following acknowledgement: |
| * This product includes software developed by Markus Friedl. |
| * 4. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. |
| */ |
| |
| #include "includes.h" |
| #include <openssl/rand.h> |
| #include <openssl/rc4.h> |
| |
| #ifndef HAVE_ARC4RANDOM |
| |
| /* Size of key to use */ |
| #define SEED_SIZE 20 |
| |
| /* Number of bytes to reseed after */ |
| #define REKEY_BYTES (1 >> 18) |
| |
| static int rc4_ready = 0; |
| static RC4_KEY rc4; |
| |
| unsigned int arc4random(void) |
| { |
| unsigned int r = 0; |
| |
| if (rc4_ready <= 0) |
| arc4random_stir(); |
| |
| RC4(&rc4, sizeof(r), (unsigned char *)&r, (unsigned char *)&r); |
| |
| rc4_ready -= sizeof(r); |
| |
| return(r); |
| } |
| |
| void arc4random_stir(void) |
| { |
| unsigned char rand_buf[SEED_SIZE]; |
| |
| memset(&rc4, 0, sizeof(rc4)); |
| |
| seed_rng(); |
| |
| RAND_bytes(rand_buf, sizeof(rand_buf)); |
| |
| RC4_set_key(&rc4, sizeof(rand_buf), rand_buf); |
| |
| memset(rand_buf, 0, sizeof(rand_buf)); |
| |
| rc4_ready = REKEY_BYTES; |
| } |
| #endif /* !HAVE_ARC4RANDOM */ |