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/* common.monoalphabetic.c - common monoalphabetic key manipulation routines
*
* 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.h"
#include "common.monoalphabetic.h"
/* Makes a display of two rows of letters, to illustrate a key */
GtkWidget *make_key_display(key *global_key_ptr, GtkWidget **global_key_labels) {
int i;
GtkWidget *table;
GtkWidget *label;
char buf[2];
table = gtk_table_new(2, 26, TRUE);
for (i=0; i < 26; i++) {
sprintf(buf, "%c", i + 'A');
label = gtk_label_new(buf);
gtk_misc_set_alignment(GTK_MISC(label), 0.5, 1.0);
gtk_table_attach(GTK_TABLE(table), label, i, i + 1, 0, 1, GTK_FILL, GTK_FILL, 2, 2);
gtk_widget_show(label);
sprintf(buf, "%c", (*global_key_ptr)[i + 'A']);
label = gtk_label_new(buf);
gtk_misc_set_alignment(GTK_MISC(label), 0.5, 0.0);
gtk_table_attach(GTK_TABLE(table), label, i, i + 1, 1, 2, GTK_FILL, GTK_FILL, 2, 2);
gtk_widget_show(label);
global_key_labels[i] = label;
}
return table;
}
/* Match the user interface display with the contents of the global key */
void update_key_labels(key *global_key_ptr, GtkWidget **global_key_labels) {
int i;
char buf[2];
for (i = 0; i < 26; i++) {
if ((*global_key_ptr)[i + 'A'])
sprintf(buf, "%c", (*global_key_ptr)[i + 'A']);
else
sprintf(buf, "*");
gtk_label_set(GTK_LABEL(global_key_labels[i]), buf);
}
}
char *apply_key_text(key *k, char *text) {
char c, new_c;
int i;
char *newtext;
int length = strlen(text);
newtext = malloc((length + 1) * sizeof(char));
for (i = 0; i < length; i++) {
c = text[i];
if (!isalpha(c)) {
newtext[i] = c;
continue;
}
c = toupper(c);
new_c = (*k)[(int) c];
if (new_c)
newtext[i] = new_c;
else
newtext[i] = c;
}
newtext[i] = '\0';
return newtext;
}
/* Return the identity permutation */
void key_identity(key *k) {
char letter;
for (letter = 'A'; letter <= 'Z'; letter++)
(*k)[(int)letter] = tolower(letter);
}
/* From - to */
void key_copy(key *k1, key *k2) {
int i, j;
for (i = 'A', j = 'A'; i <= 'Z'; (*k2)[i++] = (*k1)[j++]) ;
}
void key_swap(key *k, int index1, int index2) {
char temp = (*k)[index1];
(*k)[index1] = (*k)[index2];
(*k)[index2] = temp;
}
void key_shift_L(key *k) {
int i;
char wrapchar = (*k)['A'];
for (i = 1; i < 26; i++)
(*k)[i + 'A' - 1] = (*k)[i + 'A'];
(*k)['Z'] = wrapchar;
}
void key_shift_R(key *k) {
int i;
char wrapchar = (*k)['Z'];
for (i = 24; i >=0 ; i--)
(*k)[i + 'A' + 1] = (*k)[i + 'A'];
(*k)['A'] = wrapchar;
}
void key_reverse(key *k) {
int i;
for (i = 0; i < 13; i++)
key_swap(k, i + 'A', 25 - i + 'A');
}
void key_invert(key *k) {
int i;
key k2;
int to_upper = 'A' - 'a';
/* initialise k2 */
for (i = 0; i < 26; i++)
k2[i + 'A'] = 0;
/* reverse pairs across k into k2 */
for (i = 0; i < 26; i++)
if ((*k)[i + 'A'])
k2[((*k)[i + 'A']) + to_upper] = i + 'a';
/* copy k2 into k */
for (i = 0; i < 26; i++)
(*k)[i + 'A'] = k2[i + 'A'];
}
void key_clear (key *k) {
int i;
for (i = 0; i < 26; i++)
(*k)[i + 'A'] = 0;
}
/* Make the key bijective */
void key_complete (key *k) {
key to_count_list;
int i;
key from, to;
int from_count = 0, to_count = 0;
char fc, tc;
/* Two inversions will make the key injective*/
key_invert(k);
key_invert(k);
/* Now need to make it surjective */
/* Blank to_count_list */
for (i = 0; i < 26; i++)
to_count_list[i] = 0;
/* Construct from[], which lists all the unmapped 'from' letters */
for (i = 0; i < 26; i++) {
fc = i + 'A';
tc = (*k)[(int)fc];
if (tc)
to_count_list[(int)tc - 'a'] = TRUE;
else {
from[from_count] = fc;
from_count++;
}
}
/* From to_count_list, construct the unmapped 'to' letters */
for (i = 0; i < 26; i ++)
if (!to_count_list[i]) {
to[to_count] = 'a' + i;
to_count++;
}
for (i = 0; i < to_count; i++)
(*k)[(int)from[i]] = to[i];
}
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