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Diffstat (limited to 'openssl/crypto/rand/rand_unix.c')
| -rw-r--r-- | openssl/crypto/rand/rand_unix.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/openssl/crypto/rand/rand_unix.c b/openssl/crypto/rand/rand_unix.c new file mode 100644 index 000000000..71b98ec21 --- /dev/null +++ b/openssl/crypto/rand/rand_unix.c @@ -0,0 +1,330 @@ +/* crypto/rand/rand_unix.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * 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 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 cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 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. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ +/* ==================================================================== + * Copyright (c) 1998-2006 The OpenSSL Project. 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 acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ +#include <stdio.h> + +#define USE_SOCKETS +#include "e_os.h" +#include "cryptlib.h" +#include <openssl/rand.h> +#include "rand_lcl.h" + +#if !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE)) + +#include <sys/types.h> +#include <sys/time.h> +#include <sys/times.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <time.h> +#if defined(OPENSSL_SYS_LINUX) /* should actually be available virtually everywhere */ +# include <poll.h> +#endif +#include <limits.h> +#ifndef FD_SETSIZE +# define FD_SETSIZE (8*sizeof(fd_set)) +#endif + +#ifdef __OpenBSD__ +int RAND_poll(void) +{ + u_int32_t rnd = 0, i; + unsigned char buf[ENTROPY_NEEDED]; + + for (i = 0; i < sizeof(buf); i++) { + if (i % 4 == 0) + rnd = arc4random(); + buf[i] = rnd; + rnd >>= 8; + } + RAND_add(buf, sizeof(buf), ENTROPY_NEEDED); + memset(buf, 0, sizeof(buf)); + + return 1; +} +#else /* !defined(__OpenBSD__) */ +int RAND_poll(void) +{ + unsigned long l; + pid_t curr_pid = getpid(); +#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) + unsigned char tmpbuf[ENTROPY_NEEDED]; + int n = 0; +#endif +#ifdef DEVRANDOM + static const char *randomfiles[] = { DEVRANDOM }; + struct stat randomstats[sizeof(randomfiles)/sizeof(randomfiles[0])]; + int fd; + size_t i; +#endif +#ifdef DEVRANDOM_EGD + static const char *egdsockets[] = { DEVRANDOM_EGD, NULL }; + const char **egdsocket = NULL; +#endif + +#ifdef DEVRANDOM + memset(randomstats,0,sizeof(randomstats)); + /* Use a random entropy pool device. Linux, FreeBSD and OpenBSD + * have this. Use /dev/urandom if you can as /dev/random may block + * if it runs out of random entries. */ + + for (i=0; i<sizeof(randomfiles)/sizeof(randomfiles[0]) && n < ENTROPY_NEEDED; i++) + { + if ((fd = open(randomfiles[i], O_RDONLY +#ifdef O_NONBLOCK + |O_NONBLOCK +#endif +#ifdef O_BINARY + |O_BINARY +#endif +#ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it + our controlling tty */ + |O_NOCTTY +#endif + )) >= 0) + { + int usec = 10*1000; /* spend 10ms on each file */ + int r; + size_t j; + struct stat *st=&randomstats[i]; + + /* Avoid using same input... Used to be O_NOFOLLOW + * above, but it's not universally appropriate... */ + if (fstat(fd,st) != 0) { close(fd); continue; } + for (j=0;j<i;j++) + { + if (randomstats[j].st_ino==st->st_ino && + randomstats[j].st_dev==st->st_dev) + break; + } + if (j<i) { close(fd); continue; } + + do + { + int try_read = 0; + +#if defined(OPENSSL_SYS_LINUX) + /* use poll() */ + struct pollfd pset; + + pset.fd = fd; + pset.events = POLLIN; + pset.revents = 0; + + if (poll(&pset, 1, usec / 1000) < 0) + usec = 0; + else + try_read = (pset.revents & POLLIN) != 0; + +#else + /* use select() */ + fd_set fset; + struct timeval t; + + t.tv_sec = 0; + t.tv_usec = usec; + + if (FD_SETSIZE > 0 && (unsigned)fd >= FD_SETSIZE) + { + /* can't use select, so just try to read once anyway */ + try_read = 1; + } + else + { + FD_ZERO(&fset); + FD_SET(fd, &fset); + + if (select(fd+1,&fset,NULL,NULL,&t) >= 0) + { + usec = t.tv_usec; + if (FD_ISSET(fd, &fset)) + try_read = 1; + } + else + usec = 0; + } +#endif + + if (try_read) + { + r = read(fd,(unsigned char *)tmpbuf+n, ENTROPY_NEEDED-n); + if (r > 0) + n += r; + } + else + r = -1; + + /* Some Unixen will update t in select(), some + won't. For those who won't, or if we + didn't use select() in the first place, + give up here, otherwise, we will do + this once again for the remaining + time. */ + if (usec == 10*1000) + usec = 0; + } + while ((r > 0 || + (errno == EINTR || errno == EAGAIN)) && usec != 0 && n < ENTROPY_NEEDED); + + close(fd); + } + } +#endif /* defined(DEVRANDOM) */ + +#ifdef DEVRANDOM_EGD + /* Use an EGD socket to read entropy from an EGD or PRNGD entropy + * collecting daemon. */ + + for (egdsocket = egdsockets; *egdsocket && n < ENTROPY_NEEDED; egdsocket++) + { + int r; + + r = RAND_query_egd_bytes(*egdsocket, (unsigned char *)tmpbuf+n, + ENTROPY_NEEDED-n); + if (r > 0) + n += r; + } +#endif /* defined(DEVRANDOM_EGD) */ + +#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) + if (n > 0) + { + RAND_add(tmpbuf,sizeof tmpbuf,(double)n); + OPENSSL_cleanse(tmpbuf,n); + } +#endif + + /* put in some default random data, we need more than just this */ + l=curr_pid; + RAND_add(&l,sizeof(l),0.0); + l=getuid(); + RAND_add(&l,sizeof(l),0.0); + + l=time(NULL); + RAND_add(&l,sizeof(l),0.0); + +#if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) + return 1; +#else + return 0; +#endif +} + +#endif /* defined(__OpenBSD__) */ +#endif /* !(defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_OS2) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE)) */ + + +#if defined(OPENSSL_SYS_VXWORKS) +int RAND_poll(void) + { + return 0; + } +#endif |