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[FILE BEGIN]
1/* SPDX-License-Identifier: GPL-3.0
2 * XORenc
3 *
4 * main.c
5 *
6 * COPYRIGHT NOTICE
7 * Copyright (C) 2024-2025 0x4248 and contributors
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the license is not changed.
10 *
11 * This software is free and open source. Licensed under the GNU general
12 * public license version 3.0 as published by the Free Software Foundation.
13 */
14
15#include <stdio.h>
16
17char *encode(char *str, int *key)
18{
19	/**
20	 * Loop over each item in input string (str) and XOR it with the key using
21	 * the modulo operator to get the correct index of the key.
22	 *
23	 * If we hit \0 we are at the end of the string and we can stop.
24	 */
25	for (int i = 0; str[i] != '\0'; i++)
26	{
27		str[i] = str[i] ^ key[i % 4];
28	}
29	return str;
30}
31
32int main()
33{
34	char str[100];
35	int key[100];
36
37	/* input */
38	printf("Enter a string: ");	
39	scanf("%s", str);
40	printf("Enter a key: ");
41	scanf("%d", key);
42
43	/* Encrypt */
44	encode(str, key);
45	printf("%s\n", str);
46
47	/* Decrypt */
48	encode(str, key);
49	printf("%s\n", str);
50	return 0;
51}
[FILE END]
(C) 2025 0x4248
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