diff options
Diffstat (limited to 'shared/ossp_uuid/uuid_prng.c')
| -rw-r--r-- | shared/ossp_uuid/uuid_prng.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/shared/ossp_uuid/uuid_prng.c b/shared/ossp_uuid/uuid_prng.c deleted file mode 100644 index 9ebca40f..00000000 --- a/shared/ossp_uuid/uuid_prng.c +++ /dev/null @@ -1,198 +0,0 @@ -/* -** OSSP uuid - Universally Unique Identifier -** Copyright (c) 2004-2008 Ralf S. Engelschall <rse@engelschall.com> -** Copyright (c) 2004-2008 The OSSP Project <http://www.ossp.org/> -** -** This file is part of OSSP uuid, a library for the generation -** of UUIDs which can found at http://www.ossp.org/pkg/lib/uuid/ -** -** Permission to use, copy, modify, and distribute this software for -** any purpose with or without fee is hereby granted, provided that -** the above copyright notice and this permission notice appear in all -** copies. -** -** THIS SOFTWARE IS PROVIDED ``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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR -** 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. -** -** uuid_prng.c: PRNG API implementation -*/ - -/* own headers (part 1/2) */ -#include "uuid_ac.h" - -/* system headers */ -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <time.h> -#include <sys/time.h> -#include <fcntl.h> -#if defined(WIN32) -#define WINVER 0x0500 -#include <windows.h> -#include <wincrypt.h> -#endif - -/* own headers (part 2/2) */ -#include "uuid_time.h" -#include "uuid_prng.h" -#include "uuid_md5.h" - -struct prng_st { - int dev; /* system PRNG device */ - md5_t *md5; /* local MD5 PRNG engine */ - long cnt; /* time resolution compensation counter */ -}; - -prng_rc_t prng_create(prng_t **prng) -{ -#if !defined(WIN32) - int fd = -1; -#endif - struct timeval tv; - pid_t pid; - unsigned int i; - - /* sanity check argument(s) */ - if (prng == NULL) - return PRNG_RC_ARG; - - /* allocate object */ - if ((*prng = (prng_t *)malloc(sizeof(prng_t))) == NULL) - return PRNG_RC_MEM; - - /* try to open the system PRNG device */ - (*prng)->dev = -1; -#if !defined(WIN32) - if ((fd = open("/dev/urandom", O_RDONLY)) == -1) - fd = open("/dev/random", O_RDONLY|O_NONBLOCK); - if (fd != -1) { - (void)fcntl(fd, F_SETFD, FD_CLOEXEC); - (*prng)->dev = fd; - } -#endif - - /* initialize MD5 engine */ - if (md5_create(&((*prng)->md5)) != MD5_RC_OK) { - free(*prng); - return PRNG_RC_INT; - } - - /* initialize time resolution compensation counter */ - (*prng)->cnt = 0; - - /* seed the C library PRNG once */ - (void)time_gettimeofday(&tv); - pid = getpid(); - srand((unsigned int)( - ((unsigned int)pid << 16) - ^ (unsigned int)pid - ^ (unsigned int)tv.tv_sec - ^ (unsigned int)tv.tv_usec)); - for (i = (unsigned int)((tv.tv_sec ^ tv.tv_usec) & 0x1F); i > 0; i--) - (void)rand(); - - return PRNG_RC_OK; -} - -prng_rc_t prng_data(prng_t *prng, void *data_ptr, size_t data_len) -{ - size_t n; - unsigned char *p; - struct { - struct timeval tv; - long cnt; - int rnd; - } entropy; - unsigned char md5_buf[MD5_LEN_BIN]; - unsigned char *md5_ptr; - size_t md5_len; - int retries; - int i; -#if defined(WIN32) - HCRYPTPROV hProv; -#endif - - /* sanity check argument(s) */ - if (prng == NULL || data_len == 0) - return PRNG_RC_ARG; - - /* prepare for generation */ - p = (unsigned char *)data_ptr; - n = data_len; - - /* approach 1: try to gather data via stronger system PRNG device */ - if (prng->dev != -1) { - retries = 0; - while (n > 0) { - i = (int)read(prng->dev, (void *)p, n); - if (i <= 0) { - if (retries++ > 16) - break; - continue; - } - retries = 0; - n -= (unsigned int)i; - p += (unsigned int)i; - } - } -#if defined(WIN32) - else { - if (CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, 0)) - CryptGenRandom(hProv, n, p); - } -#endif - - /* approach 2: try to gather data via weaker libc PRNG API. */ - while (n > 0) { - /* gather new entropy */ - (void)time_gettimeofday(&(entropy.tv)); /* source: libc time */ - entropy.rnd = rand(); /* source: libc PRNG */ - entropy.cnt = prng->cnt++; /* source: local counter */ - - /* pass entropy into MD5 engine */ - if (md5_update(prng->md5, (void *)&entropy, sizeof(entropy)) != MD5_RC_OK) - return PRNG_RC_INT; - - /* store MD5 engine state as PRN output */ - md5_ptr = md5_buf; - md5_len = sizeof(md5_buf); - if (md5_store(prng->md5, (void **)(void *)&md5_ptr, &md5_len) != MD5_RC_OK) - return PRNG_RC_INT; - for (i = 0; i < MD5_LEN_BIN && n > 0; i++, n--) - *p++ ^= md5_buf[i]; /* intentionally no assignment because arbitrary - caller buffer content is leveraged, too */ - } - - return PRNG_RC_OK; -} - -prng_rc_t prng_destroy(prng_t *prng) -{ - /* sanity check argument(s) */ - if (prng == NULL) - return PRNG_RC_ARG; - - /* close PRNG device */ - if (prng->dev != -1) - (void)close(prng->dev); - - /* destroy MD5 engine */ - (void)md5_destroy(prng->md5); - - /* free object */ - free(prng); - - return PRNG_RC_OK; -} - |