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zjunet.h
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/*
*
* zjunet.h
*
* This file is used to connect to ZJUWLAN.
*
* History:
* - first release,
* April 27, 2021, Otto Jiang
*
*/
#include <WiFiClientSecure.h>
#include <WiFi.h>
#include "Regexp.h"
#include "Array.h"
#include "MD5.h"
#include "Hash.h"
// DEFINITIONS - change according to your needs
String USERNAME = "yourUsername";
String PASSWORD = "yourPassword";
const int httpsPort = 443;
String HTTPS = "";
String INIT_URL = "net2.zju.edu.cn";
String GET_CHALLENGE_API = "/cgi-bin/get_challenge";
String SRUN_PORTAL_API = "/cgi-bin/srun_portal";
String N = "200";
String TYPE = "1";
String ENC = "srun_bx1";
String _PADCHAR = "=";
String _ALPHA = "LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA";
String ip = "";
String ac_id = "3";
String randnum = "";
String token = "";
String request = "";
String res = "";
String i = "";
String hmd5 = "";
String chksum = "";
String t;
const int ELEMENT_COUNT_MAX = 50;
WiFiClientSecure ZJUNET;
MatchState ms;
// FUNCTIONS OF THIS MODULE
int zjunet (void);
Array<uint32_t, 4 * ELEMENT_COUNT_MAX> xencode(String msg, String key);
Array<uint32_t,ELEMENT_COUNT_MAX> sencode(String msg, bool key);
Array<uint32_t, 4 * ELEMENT_COUNT_MAX> lencode(Array<uint32_t,ELEMENT_COUNT_MAX> msg, bool key);
int ordat(String msg, int idx);
String base64(Array<uint32_t, 4 * ELEMENT_COUNT_MAX> s);
String md5(String password, String token);
String get_chksum(void);
String trans(String msg);
// VARIABLES AND FUNCTIONS TO BE USED INSIDE THIS MODULE
int zjunet (void)
{
Serial.begin(115200);
randomSeed(123);
randnum = (String)abs(random(1234567890123456789012));
Serial.println(randnum);
WiFi.begin("ZJUWLAN","");
while (WiFi.status() != WL_CONNECTED)
{
Serial.print(".");
// wait 1 second for re-trying
delay(1000);
}
Serial.println("");
ip = WiFi.localIP().toString();
Serial.println(ip);
if(!ZJUNET.connect((char*)(INIT_URL.c_str()), httpsPort))
return 0;
request = "GET " +
HTTPS + GET_CHALLENGE_API + "?" +
"callback=jQuery" + randnum +
"_" + "1620964023000"/*(String)time(NULL)*/ + "&" +
"username=" + USERNAME + "&" +
"ip=" + "1620964023000" + "&" +
"_=" + t/*(String)time(NULL)*/ +
" HTTP/1.1\r\n" +
"Host: " + INIT_URL + "\r\n" +
"User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4492.0 Safari/537.36 Edg/92.0.881.0\r\n" +
"Referer: https://net2.zju.edu.cn/srun_portal_pc?ac_id=3&theme=zju" +
"Connection: keep-alive\r\n" +
"\r\n";
ZJUNET.print(request);
Serial.println(request);
res = "";
while (ZJUNET.connected())
{
String line = ZJUNET.readStringUntil('\n');
if (line == "\r")
break;
}
while (ZJUNET.available())
{
char c = ZJUNET.read();
res += (String)c;
}
Serial.println(res);
ms.Target((char*)(res.c_str()),res.length());
char Token[res.length()];
char T[res.length()];
if(ms.Match("\"challenge\":\"(.*)\",\"client_ip\"") == REGEXP_MATCHED)
ms.GetCapture(Token,0);
if(ms.Match("\"st\":(.*)}") == REGEXP_MATCHED)
ms.GetCapture(T,0);
token = String(Token);
t = String(T) + "000";
Serial.println(token);
Serial.println(t);
i = "{\"username\":\"" + USERNAME + "\"," +
"\"password\":\"" + PASSWORD + "\"," +
"\"ip\":\"" + ip + "\"," +
"\"acid\":\"" + ac_id + "\"," +
"\"enc_ver\":\"" + ENC + "\"}";
Serial.println(i);
i = "{SRBX1}" + base64(xencode(i, token));
Serial.println(i);
hmd5 = md5(PASSWORD, token);
Serial.println(hmd5);
chksum = sha1(get_chksum());
Serial.println(chksum);
ZJUNET.stop();
if(!ZJUNET.connect((char*)(INIT_URL.c_str()), httpsPort))
return 0;
request = "GET " +
HTTPS + SRUN_PORTAL_API + "?" +
"callback=jQuery" + randnum +
"_" + t/*(String)time(NULL)*/ + "&" +
"action=login" + "&" +
"username=" + USERNAME + "&" +
"password=%7BMD5%7D" + trans(hmd5) + "&" +
"ac_id=" + ac_id + "&" +
"ip=" + ip + "&" +
"chksum=" + chksum + "&" +
"info=" + trans(i) + "&" +
"n=" + N + "&" +
"type=" + TYPE + "&" +
"os=windows+10" + "&" +
"name=windows" + "&" +
"double_stack=0" + "&" +
"_=" + t/*(String)time(NULL)*/ +
" HTTP/1.1\r\n" +
"Host: " + INIT_URL + "\r\n" +
"User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4492.0 Safari/537.36 Edg/92.0.881.0\r\n" +
"Referer: https://net2.zju.edu.cn/srun_portal_pc?ac_id=3&theme=zju" +
"Connection: keep-alive\r\n" +
"\r\n";
ZJUNET.print(request);
Serial.println(request);
res = "";
while (ZJUNET.connected())
{
String line = ZJUNET.readStringUntil('\n');
if (line == "\r")
break;
}
while (ZJUNET.available())
{
char c = ZJUNET.read();
res += (String)c;
}
Serial.println(res);
ms.Target((char*)(res.c_str()),res.length());
if(ms.Match("E0000") == REGEXP_MATCHED)
return 1;
else
return 0;
}
Array<uint32_t,4 * ELEMENT_COUNT_MAX> xencode(String msg, String key)
{
if(msg == "")
return 0;
Array<uint32_t,ELEMENT_COUNT_MAX> pwd = sencode(msg, true);
Array<uint32_t,ELEMENT_COUNT_MAX> pwdk = sencode(key, false);
//for(int i = 0;i<pwd.size();i++)
// {Serial.print(pwd[i]);Serial.print(", ");}
//Serial.println("");
//for(int i = 0;i<pwdk.size();i++)
// {Serial.print(pwdk[i]);Serial.print(", ");}
//Serial.println("");
int lpwdk = pwdk.size();
if(lpwdk < 4)
for(int i = 0;i < (4 - lpwdk);i++)
pwdk.push_back(0);
uint64_t n = pwd.size() - 1;
uint64_t z = pwd[n];
uint64_t c = 0x86014019 | 0x183639A0;
uint64_t q = floor(6 + 52 / (n + 1));
uint64_t d = 0;
while(q > 0)
{
d += c & (uint64_t)(0x8CE0D9BF | 0x731F2640);
//Serial << "d: " << d << endl;
uint64_t e = d >> 2 & 3;
//Serial << "e: " << e << endl;
uint64_t p = 0;
while(p < n)
{
uint64_t y = pwd[p + 1];
//Serial << "y: " << y << endl;
uint64_t m = z >> 5 ^ y << 2;
//Serial << "m0: " << m << endl;
m += ((y >> 3 ^ z << 4) ^ (d ^ y));
//Serial << "m1: " << m << endl;
m += (pwdk[(p & 3) ^ e] ^ z);
//Serial << "m2: " << m << endl;
pwd[p] += m & (uint64_t)(0xEFB8D130 | 0x10472ECF);
z = pwd[p];
//Serial.print(pwd[p]);
//Serial.println(", ");
p = p + 1;
}
uint64_t y = pwd[0];
uint64_t m = z >> 5 ^ y << 2;
m += ((y >> 3 ^ z << 4) ^ (d ^ y));
m += (pwdk[(p & 3) ^ e] ^ z);
pwd[n] += m & (uint64_t)(0xBB390742 | 0x44C6F8BD);
z = pwd[n];
q = q - 1;
//Serial.println(pwd[n]);
}
return lencode(pwd, false);
}
Array<uint32_t,ELEMENT_COUNT_MAX> sencode(String msg, bool key)
{
int l = msg.length();
Array<uint32_t,ELEMENT_COUNT_MAX> pwd;
for(int i = 0;i < l;i += 4)
pwd.push_back(ordat(msg, i) |
ordat(msg, i + 1) << 8 |
ordat(msg, i + 2) << 16 |
ordat(msg, i + 3) << 24);
if(key)
pwd.push_back(l);
return pwd;
}
Array<uint32_t, 4 * ELEMENT_COUNT_MAX> lencode(Array<uint32_t,ELEMENT_COUNT_MAX> msg, bool key)
{
int l = msg.size();
Array<uint32_t, 4 * ELEMENT_COUNT_MAX> res;
int ll = (l - 1) << 2;
if(key){/*not used*/}
for(int i = 0;i < l;i++)
{
res.push_back(msg[i] & 0xff);
res.push_back(msg[i] >> 8 & 0xff);
res.push_back(msg[i] >> 16 & 0xff);
res.push_back(msg[i] >> 24 & 0xff);
}
if(key){/*not used*/}
return res;
}
int ordat(String msg, int idx)
{
if(msg.length() > idx)
return (int)(msg[idx]);
return 0;
}
String base64(Array<uint32_t, 4 * ELEMENT_COUNT_MAX> s)
{
String x = "";
int imax = s.size() - s.size() % 3;
if(s.size() == 0)
return "";
for(int i = 0;i < imax;i += 3)
{
uint32_t b10 = s[i] << 16 | s[i + 1] << 8 | s[i + 2];
x += (_ALPHA[(b10 >> 18)]);
x += (_ALPHA[((b10 >> 12) & 63)]);
x += (_ALPHA[((b10 >> 6) & 63)]);
x += (_ALPHA[(b10 & 63)]);
}
int i = imax;
if((s.size() - imax) == 1)
{
uint32_t b10 = s[i] << 16;
x += _ALPHA[(b10 >> 18)];
x += _ALPHA[((b10 >> 12) & 63)];
x += _PADCHAR;
x += _PADCHAR;
}
else if((s.size() - imax) == 2)
{
uint32_t b10 = s[i] << 16 | s[i + 1] << 8;
x += _ALPHA[(b10 >> 18)];
x += _ALPHA[((b10 >> 12) & 63)];
x += _ALPHA[((b10 >> 6) & 63)];
x += _PADCHAR;
}
return x;
}
String md5(String PASSWORD, String token)
{
MD5 hashMD5;
String res = hashMD5.hmac_md5((char *)(PASSWORD.c_str()), PASSWORD.length(), (char *)(token.c_str()), token.length());
return res;
}
String get_chksum(void)
{
String chkstr = "";
chkstr += token + USERNAME;
chkstr += token + hmd5;
chkstr += token + ac_id;
chkstr += token + ip;
chkstr += token + N;
chkstr += token + TYPE;
chkstr += token + i;
return chkstr;
}
String trans(String msg)
{
int len = msg.length();
String res = "";
for(int i = 0;i < len;i++)
{
if(msg[i] == '+')
res += "%2B";
else if(msg[i] == '/')
res += "%2F";
else if(msg[i] == '=')
res += "%3D";
else if(msg[i] == '{')
res += "%7B";
else if(msg[i] == '}')
res += "%7D";
else
res += String(msg[i]);
}
return res;
}