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/* transpositions.grid-brute-force.c - automatic brute force checker for route ciphers
*
* This program is part of Crank, a cryptanalysis tool
* Copyright (C) 2000 Matthew Russell
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 (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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "crank-interface.h"
#include "common.statistics.n-grams.h"
#include "common.transpositions.rectangular.h"
/* Global data */
int rows, cols;
gridpath readpath, writepath;
static GtkWidget *progress_bar;
static GtkWidget *stop_button;
static int abort_computation = FALSE; /* Whether the user has signalled to abort a computation */
static float *slft_std;
static float *bift_std;
static float *trift_std;
/* fn decls */
static void do_break(void);
static void cb_break(GtkWidget *widget, gpointer gdata);
static gint cb_abort(GtkWidget *widget, gpointer gdata);
/* Plugin Interface */
/* ---------------- */
const char name[] = "transpositions.grid-brute-force";
const char version[] = VERSION;
const char author[] = "Matthew Russell";
const char description[] = "A brute force automatic cracker for rectangular grid route ciphers.";
const int interface_version = 1;
const int plugin_type = PLUGIN_MODE;
const char menu_string[] = "/Transposition/Brute Force Cracker";
int boot(void) {
/* Load the standard frequency tables */
slft_std = load_slft_std(DEFAULT_SLFT);
bift_std = load_bift_std(DEFAULT_BIFT);
trift_std = load_trift_std(DEFAULT_TRIFT);
/* Set up default transposition */
cols = rows = 5;
writepath = HORIZONTALS_STRAIGHT_TL;
readpath = VERTICALS_DESCENDING_TL;
return PLUGIN_BOOT_OK;
}
void init_plugin(void) {;}
void deactivate_plugin(void) {;}
GtkWidget *make_widget(char *text) {
GtkWidget *plugin_controls;
GtkWidget *break_button;
plugin_controls = gtk_hbox_new(FALSE, 0);
break_button = gtk_button_new_with_label("Start");
gtk_signal_connect(GTK_OBJECT(break_button), "clicked", GTK_SIGNAL_FUNC(cb_break), NULL);
gtk_box_pack_start(GTK_BOX(plugin_controls), break_button, FALSE, TRUE, 0);
gtk_widget_show(break_button);
progress_bar = gtk_progress_bar_new();
gtk_box_pack_start(GTK_BOX(plugin_controls), progress_bar, FALSE, TRUE, 0);
gtk_widget_show(progress_bar);
stop_button = gtk_button_new_with_label("Stop");
gtk_signal_connect(GTK_OBJECT(stop_button), "clicked", GTK_SIGNAL_FUNC(cb_abort), NULL);
gtk_box_pack_start(GTK_BOX(plugin_controls), stop_button, FALSE, TRUE, 0);
gtk_widget_show(stop_button);
return plugin_controls;
}
char *transform(char *text) {
return transform_with_grid(rows, cols, text, writepath, readpath);
}
void reset(void) {
;
}
/* Plugin implementation */
/* --------------------- */
static void cb_break(GtkWidget *widget, gpointer gdata) {
do_break();
}
static gint cb_abort(GtkWidget *widget, gpointer gdata) {
abort_computation = TRUE;
return (FALSE);
}
/* Exhaustive Search */
static void do_break(void) {
gridpath current_writepath, current_readpath;
stats *text_stats;
float best_error, current_error;
char *temp;
abort_computation = FALSE;
/* Calculate the stats */
text_stats = make_stats(get_text(), slft_std, bift_std, trift_std);
/* Check for zero length text */
if (!text_stats->letter_count) {
free(text_stats);
return;
}
/* Lock off the rest of the UI while processing */
gtk_grab_add(stop_button);
best_error = 1000000.0;
for (current_writepath = 1; current_writepath <= MAX_GRIDPATH; current_writepath++) {
for (current_readpath = 1; current_readpath <= MAX_GRIDPATH; current_readpath++) {
if (abort_computation)
goto end_main_loop;
// free_stats(text_stats);
temp = transform_with_grid(rows, cols, get_text(), current_writepath, current_readpath);
// text_stats = make_stats(temp, slft_std, bift_std, trift_std);
current_error = (*global_fitness)(temp);
free(temp);
if (current_error < best_error) {
best_error = current_error;
readpath = current_readpath;
writepath = current_writepath;
display_text();
}
gtk_progress_bar_update(GTK_PROGRESS_BAR(progress_bar), (float) ((current_writepath - 1) * MAX_GRIDPATH + current_readpath) / (float) (MAX_GRIDPATH * MAX_GRIDPATH));
yield_to_ui();
}
}
end_main_loop:
/* Clean up */
gtk_progress_bar_update(GTK_PROGRESS_BAR(progress_bar), 0.0);
abort_computation = TRUE;
while (gtk_grab_get_current())
gtk_grab_remove(gtk_grab_get_current());
if (text_stats)
free_stats(text_stats);
display_text();
}
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