/* 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) 1998-2000 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). * */ #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)) #include <sys/types.h> #include <sys/time.h> #include <sys/times.h> #include <fcntl.h> #include <unistd.h> #include <time.h> 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, NULL }; const char **randomfile = NULL; int fd; #endif #ifdef DEVRANDOM_EGD static const char *egdsockets[] = { DEVRANDOM_EGD, NULL }; const char **egdsocket = NULL; #endif #ifdef DEVRANDOM /* 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 (randomfile = randomfiles; *randomfile && n < ENTROPY_NEEDED; randomfile++) { if ((fd = open(*randomfile, O_RDONLY|O_NONBLOCK #ifdef O_NOCTTY /* If it happens to be a TTY (god forbid), do not make it our controlling tty */ |O_NOCTTY #endif #ifdef O_NOFOLLOW /* Fail if the file is a symbolic link */ |O_NOFOLLOW #endif )) >= 0) { struct timeval t = { 0, 10*1000 }; /* Spend 10ms on each file. */ int r; fd_set fset; do { FD_ZERO(&fset); FD_SET(fd, &fset); r = -1; if (select(fd+1,&fset,NULL,NULL,&t) < 0) t.tv_usec=0; else if (FD_ISSET(fd, &fset)) { r=read(fd,(unsigned char *)tmpbuf+n, ENTROPY_NEEDED-n); if (r > 0) n += r; } /* Some Unixen will update t, some won't. For those who won't, give up here, otherwise, we will do this once again for the remaining time. */ if (t.tv_usec == 10*1000) t.tv_usec=0; } while ((r > 0 || (errno == EINTR || errno == EAGAIN)) && t.tv_usec != 0 && n < ENTROPY_NEEDED); close(fd); } } #endif #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 #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) if (n > 0) { RAND_add(tmpbuf,sizeof tmpbuf,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); l=getuid(); RAND_add(&l,sizeof(l),0); l=time(NULL); RAND_add(&l,sizeof(l),0); #if defined(DEVRANDOM) || defined(DEVRANDOM_EGD) return 1; #else return 0; #endif } #endif #if defined(OPENSSL_SYS_VXWORKS) int RAND_poll(void) { return 0; } #endif