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rabbi |
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/* Mixmaster version 3 -- (C) 1999 Anonymizer Inc.
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Mixmaster may be redistributed and modified under certain conditions.
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This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
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ANY KIND, either express or implied. See the file COPYRIGHT for
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details.
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Get randomness from device or user
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$Id: rndseed.c,v 1.1 2001/10/31 08:19:53 rabbi Exp $ */
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#include "mix3.h"
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#include <assert.h>
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#include <time.h>
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#include <fcntl.h>
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#include <time.h>
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#ifdef POSIX
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#include <unistd.h>
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#include <termios.h>
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#else
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#include <io.h>
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#include <process.h>
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#endif
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#if defined(WIN32) || defined(MSDOS)
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#include <conio.h>
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#endif
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#ifdef WIN32
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#include <windows.h>
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#endif
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#define NEEDED 128
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#ifndef O_NDELAY
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#define O_NDELAY 0
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#endif
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int kbd_noecho(void)
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{
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#ifdef HAVE_TERMIOS
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int fd;
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struct termios attr;
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setbuf(stdin, NULL);
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fd = fileno(stdin);
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if (tcgetattr(fd, &attr) != 0)
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return (-1);
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attr.c_lflag &= ~(ECHO | ICANON);
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if (tcsetattr(fd, TCSAFLUSH, &attr) != 0)
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return (-1);
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#endif
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return (0);
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}
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int kbd_echo(void)
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{
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#ifdef HAVE_TERMIOS
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int fd;
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struct termios attr;
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setvbuf(stdin, NULL, _IOLBF, BUFSIZ);
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fd = fileno(stdin);
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if (tcgetattr(fd, &attr) != 0)
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return (-1);
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attr.c_lflag |= ECHO | ICANON;
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if (tcsetattr(fd, TCSAFLUSH, &attr) != 0)
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return (-1);
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#endif
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return (0);
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}
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void rnd_error(void)
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{
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errlog(ERRORMSG,
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"Random number generator not initialized. Aborting.\n\
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Run the program interactively to seed the generator.\n");
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exit(3);
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}
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/* get randomness from system or user. If the application has promised that
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it will seed the RNG later, we do not ask for user input */
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int rnd_seed(void)
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{
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int fd = -1;
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byte b[512], c = 0;
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int bytes = 0;
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#ifdef DEV_RANDOM
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fd = open(DEV_RANDOM, O_RDONLY | O_NDELAY);
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#endif
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if (fd == -1) {
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#if 1
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if (rnd_state == RND_WILLSEED)
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return(-1);
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if (!isatty(fileno(stdin)))
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rnd_error();
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#else
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#error "should initialize the prng from system ressources"
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#endif
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fprintf(stderr, "Please enter some random characters.\n");
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kbd_noecho();
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while (bytes < NEEDED) {
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fprintf(stderr, " %d \r", NEEDED - bytes);
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#ifdef HAVE_GETKEY
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if (kbhit(), *b = getkey())
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#else
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if (read(fileno(stdin), b, 1) > 0)
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#endif
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{
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rnd_add(b, 1);
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rnd_time();
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if (*b != c)
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bytes++;
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c = *b;
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}
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}
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fprintf(stderr, "Thanks.\n");
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#ifdef WIN32
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Sleep(1000);
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#else
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sleep(1);
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#endif
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kbd_echo();
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}
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#ifdef DEV_RANDOM
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else {
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bytes = read(fd, b, sizeof(b));
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rnd_add(b, sizeof(b));
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close(fd);
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if (bytes < NEEDED) {
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fd = open(DEV_RANDOM, O_RDONLY); /* re-open in blocking mode */
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if (isatty(fileno(stdin))) {
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fprintf(stderr,
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"Please move the mouse, enter random characters, etc.\n");
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kbd_noecho();
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}
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while (bytes < NEEDED) {
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if (isatty(fileno(stdin)))
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fprintf(stderr, " %d \r", NEEDED - bytes);
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if (read(fd, b, 1) > 0) {
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rnd_add(b, 1);
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bytes++;
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}
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}
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if (isatty(fileno(stdin))) {
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fprintf(stderr, "Thanks.\n");
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#ifdef WIN32
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sleep(1000);
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#else
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sleep(1);
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#endif
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kbd_echo();
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}
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close(fd);
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}
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}
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#endif
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rnd_state = RND_SEEDED;
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return (0);
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}
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