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/* crypto.c
*
* Copyright 2024 axtlos <axtlos@disroot.org>
*
* 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 3.
*
* 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, see <https://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include <stdint.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
const char start[10] = {'s','s','s','d','d','d','f','f','f','f'};
const char end[11] = {'g','g','g','h','h','h','j','k','l','l','l'};
unsigned int
get_data(char *file)
{
unsigned int ret = 0;
FILE *data = NULL;
if (file) {
data = fopen (file, "r");
} else {
data = stdin;
}
unsigned int character;
while ((character = fgetc (data)) != EOF) {
ret = ret + character;
}
return ret;
}
int
main (int argc, char *argv[]) {
char *keymash = malloc(33);
int r,total = 0;
char prev = 'a';
int val = 0;
int switchup = 0;
int from_stdin = argc > 1 ? 1 : 0;
unsigned int data = 0;
data = get_data (from_stdin == 0 ? NULL : argv[argc-1]);
srand(data);
total += sprintf(keymash+total, "%c", prev);
while (total < 32) {
if (val == 0) {
int j = total+2 < 32 ? 2 : 1;
for (int i = 0; i < j; i++) {
r = abs((rand() % 10 - r) + r);
if (prev != start[r]) {
total += sprintf(keymash+total, "%c", start[r]);
prev = start[r];
} else {
i -= 1;
}
}
switchup = switchup < 0 ? 0 : switchup+1;
} else if (val == 1) {
int j = total+2 < 32 ? 2 : 1;
for (int i = 0; i < j; i++) {
r = abs((rand() % 11));
if (prev != end[r]) {
total += sprintf(keymash+total, "%c", end[r]);
prev = end[r];
} else {
i -= 1;
}
}
switchup = switchup > 0 ? 0 : switchup-1;
}
if (switchup < 2 && switchup > -2) {
val = abs(rand() % 2);
} else {
val = switchup < 0 ? 0 : 1;
}
}
puts(keymash);
free(keymash);
return 0;
}
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