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/* --- BEGIN COPYRIGHT BLOCK ---
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Copyright (C) 2007 Red Hat, Inc.
* All rights reserved.
* --- END COPYRIGHT BLOCK ---
*/
#include "tkstool.h"
/* returns 0 for success, -1 for failure (EOF encountered) */
static int
UpdateRNG( void )
{
char *randbuf;
int fd;
int i;
int count;
int c;
int rv = 0;
#ifdef XP_UNIX
cc_t orig_cc_min;
cc_t orig_cc_time;
tcflag_t orig_lflag;
struct termios tio;
#endif
#define FPS PR_fprintf( PR_STDOUT,
FPS "\n");
FPS "A random seed must be generated that will be used in the\n");
FPS "creation of your key. One of the easiest ways to create a\n");
FPS "random seed is to use the timing of keystrokes on a keyboard.\n");
FPS "\n");
FPS "To begin, type keys on the keyboard until this progress meter\n");
FPS "is full. DO NOT USE THE AUTOREPEAT FUNCTION ON YOUR KEYBOARD!\n");
FPS "\n");
FPS "\n");
FPS "Continue typing until the progress meter is full:\n\n");
FPS "| |\r|");
/* turn off echo on stdin & return on 1 char instead of NL */
fd = fileno( stdin );
#if defined( XP_UNIX ) && !defined( VMS )
tcgetattr( fd, &tio );
orig_lflag = tio.c_lflag;
orig_cc_min = tio.c_cc[VMIN];
orig_cc_time = tio.c_cc[VTIME];
tio.c_lflag &= ~ECHO;
tio.c_lflag &= ~ICANON;
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
tcsetattr( fd, TCSAFLUSH, &tio );
#endif
/* Get random noise from keyboard strokes */
randbuf = ( char * ) PORT_Alloc( RAND_BUF_LENGTH );
count = 0;
while( randbuf != NULL && count < NUM_KEYSTROKES+1 ) {
#ifdef VMS
c = GENERIC_GETCHAR_NOECHO();
#elif XP_UNIX
c = getc( stdin );
#else
c = getch();
#endif
if( c == EOF ) {
rv = -1;
break;
}
PK11_RandomUpdate(
/* data */ randbuf,
/* length in bytes */ RAND_BUF_LENGTH );
if( c != randbuf[0] ) {
randbuf[0] = c;
FPS "\r|");
for( i = 0 ;
i < count / ( NUM_KEYSTROKES / RAND_BUF_LENGTH ) ;
i++ ) {
FPS "*");
}
if( count % ( NUM_KEYSTROKES / RAND_BUF_LENGTH ) == 1 ) {
FPS "/");
}
count++;
}
}
if (randbuf != NULL) free (randbuf);
FPS "\n\n");
FPS "Finished.\n");
TKS_TypeProceedToContinue();
FPS "\n");
#undef FPS
#if defined( XP_UNIX ) && !defined( VMS )
/* set back termio the way it was */
tio.c_lflag = orig_lflag;
tio.c_cc[VMIN] = orig_cc_min;
tio.c_cc[VTIME] = orig_cc_time;
tcsetattr( fd, TCSAFLUSH, &tio );
#endif
return rv;
}
void
TKS_FileForRNG( char *noise )
{
char buf[2048];
PRFileDesc *fd;
PRInt32 count;
fd = PR_OpenFile( noise, PR_RDONLY, 0666 );
if( !fd ) {
return;
}
do {
count = PR_Read( fd, buf, sizeof( buf ) );
if (count > 0) {
PK11_RandomUpdate(
/* data */ buf,
/* length in bytes */ count );
}
} while( count > 0 );
PR_Close( fd );
}
SECStatus
TKS_SeedRNG( char *noise )
{
/* Clear the screen */
TKS_ClearScreen();
/* Seed the RNG */
if( noise ) {
TKS_FileForRNG( noise );
} else {
int rv = UpdateRNG();
if( rv ) {
PORT_SetError( PR_END_OF_FILE_ERROR );
return SECFailure;
}
}
return SECSuccess;
}
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