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/*
* Script to log in to YK Pao School Songjiang Campus student WiFi
* Written by Runxi Yu <me@runxiyu.org>
*
* This program is public domain, or under the terms of Creative Commons
* Zero 1.0 Universal, at your choice. In addition, a Waiver of Patent
* Rights apply. See the LICENSE file for details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <curl/curl.h>
void rc4(const char *plain, const char *rc4key, char *output)
{
int sbox[256];
int key_length = strlen(rc4key);
int i, j = 0, a = 0, b = 0, c;
size_t plain_length = strlen(plain);
for (i = 0; i < 256; i++)
sbox[i] = i;
for (i = 0; i < 256; i++) {
j = (j + sbox[i] + rc4key[i % key_length]) % 256;
int temp = sbox[i];
sbox[i] = sbox[j];
sbox[j] = temp;
}
for (i = 0; i < (int)plain_length; i++) {
a = (a + 1) % 256;
b = (b + sbox[a]) % 256;
int temp = sbox[a];
sbox[a] = sbox[b];
sbox[b] = temp;
c = (sbox[a] + sbox[b]) % 256;
sprintf(output + i * 2, "%02x", plain[i] ^ sbox[c]);
}
output[plain_length * 2] = '\0';
}
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