KO Myung-Hun
15 years ago
committed by
Rémi Denis-Courmont
Rémi Denis-Courmont
5 changed files with 234 additions and 138 deletions
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/*****************************************************************************
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* rand.c : non-predictible random bytes generator |
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***************************************************************************** |
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* Copyright (C) 2011 KO Myung-Hun <komh@chollian.net> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. |
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*****************************************************************************/ |
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#ifdef HAVE_CONFIG_H |
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# include "config.h" |
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#endif |
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#include <vlc_common.h> |
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#include <vlc_rand.h> |
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void vlc_rand_bytes (void *buf, size_t len) |
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{ |
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QWORD qwTime; |
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uint8_t *p_buf = (uint8_t *)buf; |
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while (len > 0) |
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{ |
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DosTmrQueryTime( &qwTime ); |
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*p_buf++ = ( uint8_t )( qwTime.ulLo * rand()); |
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len--; |
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} |
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} |
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/*****************************************************************************
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* rand.c : non-predictible random bytes generator |
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***************************************************************************** |
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* Copyright © 2007 Rémi Denis-Courmont |
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* $Id$ |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. |
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*****************************************************************************/ |
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#ifdef HAVE_CONFIG_H |
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# include "config.h" |
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#endif |
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#include <vlc_common.h> |
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#include <vlc_rand.h> |
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#include <stdint.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <sys/types.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <pthread.h> |
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#include <vlc_fs.h> |
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#include <vlc_md5.h> |
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/*
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* Pseudo-random number generator using a HMAC-MD5 in counter mode. |
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* Probably not very secure (expert patches welcome) but definitely |
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* better than rand() which is defined to be reproducible... |
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*/ |
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#define BLOCK_SIZE 64 |
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static uint8_t okey[BLOCK_SIZE], ikey[BLOCK_SIZE]; |
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static void vlc_rand_init (void) |
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{ |
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#if defined (__OpenBSD__) || defined (__OpenBSD_kernel__) |
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static const char randfile[] = "/dev/random"; |
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#else |
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static const char randfile[] = "/dev/urandom"; |
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#endif |
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uint8_t key[BLOCK_SIZE]; |
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/* Get non-predictible value as key for HMAC */ |
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int fd = vlc_open (randfile, O_RDONLY); |
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if (fd == -1) |
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return; /* Uho! */ |
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for (size_t i = 0; i < sizeof (key);) |
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{ |
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ssize_t val = read (fd, key + i, sizeof (key) - i); |
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if (val > 0) |
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i += val; |
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} |
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/* Precompute outer and inner keys for HMAC */ |
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for (size_t i = 0; i < sizeof (key); i++) |
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{ |
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okey[i] = key[i] ^ 0x5c; |
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ikey[i] = key[i] ^ 0x36; |
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} |
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close (fd); |
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} |
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void vlc_rand_bytes (void *buf, size_t len) |
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{ |
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
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static uint64_t counter = 0; |
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uint64_t stamp = NTPtime64 (); |
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while (len > 0) |
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{ |
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uint64_t val; |
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struct md5_s mdi, mdo; |
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InitMD5 (&mdi); |
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InitMD5 (&mdo); |
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pthread_mutex_lock (&lock); |
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if (counter == 0) |
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vlc_rand_init (); |
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val = counter++; |
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AddMD5 (&mdi, ikey, sizeof (ikey)); |
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AddMD5 (&mdo, okey, sizeof (okey)); |
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pthread_mutex_unlock (&lock); |
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AddMD5 (&mdi, &stamp, sizeof (stamp)); |
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AddMD5 (&mdi, &val, sizeof (val)); |
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EndMD5 (&mdi); |
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AddMD5 (&mdo, mdi.buf, 16); |
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EndMD5 (&mdo); |
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if (len < 16) |
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{ |
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memcpy (buf, mdo.buf, len); |
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break; |
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} |
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memcpy (buf, mdo.buf, 16); |
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len -= 16; |
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buf = ((uint8_t *)buf) + 16; |
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} |
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} |
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@ -0,0 +1,66 @@ |
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/*****************************************************************************
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* rand.c : non-predictible random bytes generator |
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***************************************************************************** |
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* Copyright © 2007 Rémi Denis-Courmont |
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* $Id$ |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. |
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*****************************************************************************/ |
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#ifdef HAVE_CONFIG_H |
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# include "config.h" |
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#endif |
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#include <vlc_common.h> |
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#include <vlc_rand.h> |
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#include <wincrypt.h> |
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void vlc_rand_bytes (void *buf, size_t len) |
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{ |
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HCRYPTPROV hProv; |
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size_t count = len; |
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uint8_t *p_buf = (uint8_t *)buf; |
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/* fill buffer with pseudo-random data */ |
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while (count > 0) |
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{ |
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unsigned int val; |
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val = rand(); |
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if (count < sizeof (val)) |
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{ |
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memcpy (p_buf, &val, count); |
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break; |
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} |
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memcpy (p_buf, &val, sizeof (val)); |
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count -= sizeof (val); |
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p_buf += sizeof (val); |
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} |
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/* acquire default encryption context */ |
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if( CryptAcquireContext( |
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&hProv, // Variable to hold returned handle.
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NULL, // Use default key container.
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MS_DEF_PROV, // Use default CSP.
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PROV_RSA_FULL, // Type of provider to acquire.
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0) ) |
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{ |
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/* fill buffer with pseudo-random data, intial buffer content
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is used as auxillary random seed */ |
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CryptGenRandom(hProv, len, buf); |
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CryptReleaseContext(hProv, 0); |
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} |
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} |
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