jan at nessus
Aug 23, 2006, 4:07 AM
Post #1 of 1
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NessusClient/ssl nessusclient-mkrand.c, NONE, 1.1 Makefile, 1.1.1.1, 1.2 nessus-mkrand.c, 1.1.1.1, NONE
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Update of /usr/local/cvs/NessusClient/ssl
In directory raccoon.nessus.org:/tmp/cvs-serv63114
Modified Files:
Makefile
Added Files:
nessusclient-mkrand.c
Removed Files:
nessus-mkrand.c
Log Message:
Renaming nessus-mkrand to nessusclient-mkrand.
--- NEW FILE: nessusclient-mkrand.c ---
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <sys/time.h>
#include <signal.h>
/*
* Copyright (C) 2001 Michel Arboi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2,
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* *******************************************************************
* This program generates some random data and store then to a file.
* It is useful to OpenSSL users who do not have a /dev/urandom
* Try something like:
* nessus-mkrand $HOME/.rnd 128
* *******************************************************************
*
* Note: the "entropy estimator" is really crude. The first version probably
* underestimated it, the current probably over-estimate it.
* You've been warned!
*
* $Id: nessusclient-mkrand.c,v 1.1 2006/08/23 11:07:44 jan Exp $
*
*/
FILE *fp;
/*
* Ugly but portable
*/
int
setup_tty()
{
return !system("stty -icanon") && !system("stty -echo");
}
int
restore_tty()
{
return !system("stty echo") && !system("stty icanon");
}
void
sighand(sig)
int sig;
{
restore_tty();
if(fp)fclose(fp);
exit(1);
}
int
usage()
{
fprintf(stderr, "Usage: nessus-mkrand file entropy_in_bits\nNote: Data will be appended to the file\n");
exit(1);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int entropy = 1024, i, j, x;
int prec;
double e, f, l2 = log(2.0);
struct timeval tictac;
unsigned char c, *p;
int count[256][256], sum[256];
char * out = NULL;
signal(SIGTERM, sighand);
signal(SIGINT, sighand);
if(argc > 1 && !strncmp(argv[1], "-h", 2))
{
usage();
}
if(argc > 1)
out = strdup(argv[1]);
if(argc > 2)
entropy = atoi(argv[2]);
if (entropy <= 0)
{
fprintf(stderr, "I cannot generate zero or less bytes!\n");
usage();
}
if(!out)
{
char * home = getenv("HOME");
if(!home)
{
fprintf(stderr, "$HOME not set - exiting\n");
return 1;
}
out = malloc(strlen(home) + 7);
sprintf(out, "%s/.rnd", home);
}
if ((fp = fopen(out, "a")) == NULL)
{
perror(out);
return 1;
}
for (i = 0; i < 256; i ++)
{
sum[i] = 0;
for (j = 0; j < 256; j ++)
count[i][j] = 0;
}
fprintf(stderr, "Now please enter random characters\n");
setup_tty();
prec = 0;
e = 0.0;
i = 0;
while (e < entropy)
{
gettimeofday(&tictac, NULL);
if ((x = getchar()) == EOF)
{
perror("getchar");
break;
}
c = x;
for (j = 0, p = (unsigned char*)&tictac; j < sizeof(tictac); j ++)
c = c * 11 + c % 13 + *(p++);
sum[prec] ++;
/*
* 1/48 is linked to the classical "zero probability encoding"
* that we see in compression algorithm. I chose a conservative
* value.
*/
f = log(((double) count[prec][c] + (1. / 48.))
/ (double) sum[prec]) / l2;
e -= f;
#if 0
fprintf(stderr, "c=0x%x f=%g\te=%g\n", c, -f, e);
#endif
count[prec][c] ++;
prec = c;
if (fwrite(&c, 1, 1, fp) < 1)
{
perror("fwrite");
return 1;
}
i ++;
fputs(".", stdout);
fflush(stdout);
}
restore_tty();
#ifdef DEBUG
fprintf(stderr, "Estimated entropy = %g bits (= %d bytes)\n",
e, (int) (e / 8));
fprintf(stderr, "Estimated entropy per character = %g bits\n", e / i);
#endif
#if 0
if (e < entropy)
fprintf(stderr, "\n**** WARNING. Entropy is too low ****\n\n");
#endif
if (fclose(fp) < 0)
{
perror("fclose");
return 1;
}
fprintf(stderr, "That's enough - thank you\n");
return 0;
}
Index: Makefile
===================================================================
RCS file: /usr/local/cvs/NessusClient/ssl/Makefile,v
retrieving revision 1.1.1.1
retrieving revision 1.2
diff -u -d -r1.1.1.1 -r1.2
--- Makefile 10 Sep 2005 17:36:47 -0000 1.1.1.1
+++ Makefile 23 Aug 2006 11:07:44 -0000 1.2
@@ -1,15 +1,15 @@
include ../nessus.tmpl
-OBJS = nessus-mkrand.o
+OBJS = nessusclient-mkrand.o
-all : nessus-mkrand
+all : nessusclient-mkrand
-nessus-mkrand: $(OBJS)
- $(CC) $(OBJS) -o nessus-mkrand -lm
+nessusclient-mkrand: $(OBJS)
+ $(CC) $(OBJS) -o nessusclient-mkrand -lm
-nessus-mkrand.o: nessus-mkrand.c
- $(CC) $(CFLAGS) -c nessus-mkrand.c
+nessusclient-mkrand.o: nessusclient-mkrand.c
+ $(CC) $(CFLAGS) -c nessusclient-mkrand.c
clean :
- rm -f *.o nessus-mkrand
+ rm -f *.o nessusclient-mkrand
--- nessus-mkrand.c DELETED ---
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