347 lines
6.7 KiB
C
347 lines
6.7 KiB
C
|
/* decrypt_screen.c
|
||
|
|
|
||
|
|
This function is part of the Polysqu program. It decrypts user input and
|
||
|
|
writes it to the screen.
|
||
|
|
|
||
|
|
Copyright (C) 2015, 2016 Scott C. MacCallum
|
||
|
|
scm@ma.sdf.org
|
||
|
|
|
||
|
|
This program is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Affero General Public License as published
|
||
|
|
by the Free Software Foundation, either version 3 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 for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Affero General Public License
|
||
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <ctype.h>
|
||
|
|
|
||
|
|
void decrypt_screen(void)
|
||
|
|
{
|
||
|
|
int index;
|
||
|
|
int element_number = 1;
|
||
|
|
int array_number[5];
|
||
|
|
int element_letter = 97;
|
||
|
|
int array_letter[25];
|
||
|
|
int counter_outside;
|
||
|
|
int array_input[3];
|
||
|
|
int counter_inside;
|
||
|
|
|
||
|
|
char letter;
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
printf("Your message will be decrypted using this\n");
|
||
|
|
printf("Polybius Square.\n");
|
||
|
|
|
||
|
|
/* At index zero, initialize the elements in the array of numbers
|
||
|
|
with values one through five */
|
||
|
|
|
||
|
|
for (index = 0; element_number < 6; index++)
|
||
|
|
array_number[index] = element_number++;
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
printf(" ");
|
||
|
|
|
||
|
|
/* At index zero, print the values of the elements in the array of
|
||
|
|
numbers */
|
||
|
|
|
||
|
|
for (index = 0; index < 5; index++)
|
||
|
|
printf("%d ", array_number[index]);
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
|
||
|
|
/* At index zero, print the value of the element in the array of
|
||
|
|
numbers */
|
||
|
|
|
||
|
|
printf("%d ", array_number[0]);
|
||
|
|
|
||
|
|
/* At index zero, initialize the elements in the array of letters
|
||
|
|
with ASCII values ninety-seven through one hundred twenty-one */
|
||
|
|
|
||
|
|
for (index = 0; element_letter < 122; index++)
|
||
|
|
array_letter[index] = element_letter++;
|
||
|
|
|
||
|
|
/* At index zero, print the five ASCII values of the elements in
|
||
|
|
the array of letters */
|
||
|
|
|
||
|
|
for (index = 0; index < 5; index++)
|
||
|
|
printf("%c ", array_letter[index]);
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
|
||
|
|
/* At index one, print the ASCII value of the element in the
|
||
|
|
array of numbers */
|
||
|
|
|
||
|
|
printf("%d ", array_number[1]);
|
||
|
|
|
||
|
|
/* At index five, print the five ASCII values of the elements in
|
||
|
|
the array of letters */
|
||
|
|
|
||
|
|
for (index = 5; index < 10; index++)
|
||
|
|
printf("%c ", array_letter[index]);
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
|
||
|
|
/* At index two, print the ASCII value of the element in the
|
||
|
|
array of numbers */
|
||
|
|
|
||
|
|
printf("%d ", array_number[2]);
|
||
|
|
|
||
|
|
/* At index ten, print the five ASCII values of the elements in
|
||
|
|
the array of letters */
|
||
|
|
|
||
|
|
for (index = 10; index < 15; index++)
|
||
|
|
printf("%c ", array_letter[index]);
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
|
||
|
|
/* At index three, print the ASCII value of the element in the
|
||
|
|
number array */
|
||
|
|
|
||
|
|
printf("%d ", array_number[3]);
|
||
|
|
|
||
|
|
/* At index fifteen, print the five ASCII values of the elements
|
||
|
|
in the letter array */
|
||
|
|
|
||
|
|
for (index = 15; index < 20; index++)
|
||
|
|
printf("%c ", array_letter[index]);
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
|
||
|
|
/* At index four, print the ASCII value of the element in the
|
||
|
|
number array */
|
||
|
|
|
||
|
|
printf("%d ", array_number[4]);
|
||
|
|
|
||
|
|
/* At index twenty, print the five ASCII values of the elements
|
||
|
|
in the letter array */
|
||
|
|
|
||
|
|
for (index = 20; index < 25; index++)
|
||
|
|
printf("%c ", array_letter[index]);
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
printf("\n");
|
||
|
|
printf
|
||
|
|
("Limit your encrypted message to one hundred fifty numbers;\n");
|
||
|
|
printf("end it with an exclamation point.\n");
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
printf("Encrypted Message: ");
|
||
|
|
|
||
|
|
for (counter_outside = 0; counter_outside < 77; counter_outside++) {
|
||
|
|
scanf("%d", &array_input[0]);
|
||
|
|
|
||
|
|
scanf("%d", &array_input[1]);
|
||
|
|
|
||
|
|
/* a */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[0]) {
|
||
|
|
printf("Decrypted Message: ");
|
||
|
|
|
||
|
|
for (counter_inside = 0;
|
||
|
|
counter_inside <= counter_outside;
|
||
|
|
counter_inside++) {
|
||
|
|
putchar(array_letter[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
printf("\n");
|
||
|
|
printf("\n");
|
||
|
|
printf("Encrypted Message: ");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* b */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[0]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* c */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[0]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* d */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[3]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* e */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[3]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* f */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[5]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* g */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[2] == array_number[0]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* h */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[2] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* i */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[2] == array_number[2]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* j */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[2] == array_number[3]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* k */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[2] == array_number[4]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* l */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[2] == array_number[5]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* m */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[3] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* n */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* o */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* p */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* q */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* r */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* s */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* t */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* u */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* v */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* w */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* x */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* y */
|
||
|
|
|
||
|
|
if (array_input[0] == array_number[0]
|
||
|
|
&& array_input[1] == array_number[1]) {
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
/* ! */
|
||
|
|
|
||
|
|
if (letter == '!') {
|
||
|
|
printf("\n");
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (counter_outside == 76) {
|
||
|
|
printf("\n");
|
||
|
|
printf("\n");
|
||
|
|
printf("ERROR, bad input.");
|
||
|
|
printf("\n");
|
||
|
|
printf("\n");
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|