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package com.i4things;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
/**
* Copyright (c) 2018-2019 i4things All Rights Reserved.
*
* This SOURCE CODE FILE, which has been provided by i4things as part
* of an B2N Ltd. product for use ONLY by licensed users of the product,
* includes CONFIDENTIAL and PROPRIETARY information of i4things.
*
* USE OF THIS SOFTWARE IS GOVERNED BY THE TERMS AND CONDITIONS
* OF THE LICENSE STATEMENT AND LIMITED WARRANTY FURNISHED WITH
* THE PRODUCT.
*
* IN PARTICULAR, YOU WILL INDEMNIFY AND HOLD B2N LTD., ITS
* RELATED COMPANIES AND ITS SUPPLIERS, HARMLESS FROM AND AGAINST ANY
* CLAIMS OR LIABILITIES ARISING OUT OF THE USE, REPRODUCTION, OR
* DISTRIBUTION OF YOUR PROGRAMS, INCLUDING ANY CLAIMS OR LIABILITIES
* ARISING OUT OF OR RESULTING FROM THE USE, MODIFICATION, OR
* DISTRIBUTION OF PROGRAMS OR FILES CREATED FROM, BASED ON, AND/OR
* DERIVED FROM THIS SOURCE CODE FILE.
*
* @version 2.84
*/
public class i4things
{
/**********************************************************\
| | |
| |
| XXTEA encryption algorithm library for .NET. |
| |
| Encryption Algorithm Authors: |
| David J. Wheeler |
| Roger M. Needham |
| |
| Code Author: Ma Bingyao <[email protected]> |
| LastModified: Mar 10, 2015 |
| Part modified by i4things |
| |
\**********************************************************/
private static final int DELTA = 0x9E3779B9;
private static int MX(int sum, int y, int z, int p, int e, int[] k)
{
return (z >>> 5 ^ y << 2) + (y >>> 3 ^ z << 4) ^ (sum ^ y) + (k[p & 3 ^ e] ^ z);
}
private static int[] xxteaToInt32ArrRaw(byte[] bs)
{
int length = bs.length;
int n = length >> 2;
int[] v = new int[n];
for (int i = 0; i < n; ++i)
{
int j = i << 2;
v[i] = ((bs[j + 3] & 0xFF) << 24) | ((bs[j + 2] & 0xFF) << 16) | ((bs[j + 1] & 0xFF) << 8) | (bs[j] & 0xFF);
}
return v;
}
private static int[] xxteaToInt32ArrSize(byte[] bs)
{
int length = bs.length;
++length;
byte[] bs_copy = new byte[(((length & 3) == 0) ? length : ((length >> 2) + 1) << 2)];
--length;
bs_copy[0] = (byte) length;
System.arraycopy(bs, 0, bs_copy, 1, bs.length);
int n = bs_copy.length >> 2;
if (n < 2)
{
n = 2;
}
int[] v = new int[n];
for (int i = 0; i < n; ++i)
{
int j = i << 2;
v[i] = ((bs_copy[j + 3] & 0xFF) << 24) | ((bs_copy[j + 2] & 0xFF) << 16) | ((bs_copy[j + 1] & 0xFF) << 8) | (bs_copy[j] & 0xFF);
}
return v;
}
private static byte[] xxteaToInt8ArrSize(int[] v)
{
byte[] bs = new byte[v.length << 2];
for (int i = 0; i < v.length; i++)
{
int j = (i << 2);
bs[j + 3] = (byte) (v[i] >> 24 & 0xFF);
bs[j + 2] = (byte) (v[i] >> 16 & 0xFF);
bs[j + 1] = (byte) (v[i] >> 8 & 0xFF);
bs[j] = (byte) (v[i] & 0xFF);
}
byte[] ret = new byte[bs[0] & 0xFF];
try
{
System.arraycopy(bs, 1, ret, 0, ret.length);
}
catch (Exception e)
{
e.printStackTrace();
}
return ret;
}
private static byte[] xxteaToInt8ArrRaw(int[] v)
{
byte[] bs = new byte[v.length << 2];
for (int i = 0; i < v.length; i++)
{
int j = (i << 2);
bs[j + 3] = (byte) (v[i] >> 24 & 0xFF);
bs[j + 2] = (byte) (v[i] >> 16 & 0xFF);
bs[j + 1] = (byte) (v[i] >> 8 & 0xFF);
bs[j] = (byte) (v[i] & 0xFF);
}
return bs;
}
private static int[] xxteaDecryptInt32Arr(int[] v, int[] k)
{
int n = v.length - 1;
if (n < 1)
{
return v;
}
int p, q = 6 + 52 / (n + 1);
int z, y = v[0], sum = q * DELTA, e;
while (sum != 0)
{
e = sum >>> 2 & 3;
for (p = n; p > 0; p--)
{
z = v[p - 1];
y = v[p] -= MX(sum, y, z, p, e, k);
}
z = v[n];
y = v[0] -= MX(sum, y, z, p, e, k);
sum = sum - DELTA;
}
return v;
}
private static byte[] xxteaDecrypt(byte[] data, byte[] key)
{
if (data == null || data.length == 0)
{
return data;
}
int[] dataAsIntArr = xxteaToInt32ArrRaw(data);
int[] keyAsIntArr = xxteaToInt32ArrRaw(key);
int[] decryptedIntArr = xxteaDecryptInt32Arr(dataAsIntArr, keyAsIntArr);
return xxteaToInt8ArrSize(decryptedIntArr);
}
private static int[] xxteaEncryptInt32Arr(int[] v, int[] k)
{
int n = v.length - 1;
if (n < 1)
{
return v;
}
int p, q = 6 + 52 / (n + 1);
int z = v[n], y, sum = 0, e;
while (q-- > 0)
{
sum = sum + DELTA;
e = sum >>> 2 & 3;
for (p = 0; p < n; p++)
{
y = v[p + 1];
z = v[p] += MX(sum, y, z, p, e, k);
}
y = v[0];
z = v[n] += MX(sum, y, z, p, e, k);
}
return v;
}
private static byte[] xxteaEncrypt(byte[] data, byte[] key)
{
if (data == null || data.length == 0)
{
return data;
}
int[] dataAsIntArr = xxteaToInt32ArrSize(data);
int[] keyAsIntArr = xxteaToInt32ArrRaw(key);
int[] encryptedIntArr = xxteaEncryptInt32Arr(dataAsIntArr, keyAsIntArr);
return xxteaToInt8ArrRaw(encryptedIntArr);
}
/**********************************************************\
XXTEA END
\**********************************************************/
private static String toHex(final byte[] b)
{
String result = "";
for (int i = 0; i < b.length; i++)
{
result += Integer.toString((b[i] & 0xff) + 0x100, 16).substring(1);
}
return result.toUpperCase();
}
private static byte[] fromHex(final String s)
{
if ((s.length() % 2) != 0)
{
return null;
}
final byte result[] = new byte[s.length() / 2];
final char enc[] = s.toCharArray();
for (int i = 0; i < enc.length; i += 2)
{
StringBuilder curr = new StringBuilder(2);
curr.append(enc[i]).append(enc[i + 1]);
result[i / 2] = (byte) Integer.parseInt(curr.toString(), 16);
}
return result;
}
private static byte[] toByteArray(long l)
{
byte[] ba = { 0, 0, 0, 0, 0, 0, 0, 0 };
for (int i = 0; i < ba.length; i++)
{
byte b = (byte)(l & 0xFF);
ba[i] = b;
l = (l - b) / 256;
}
return ba;
}
private static long ToLong(byte[] ba) {
long v = 0;
for (int i = ba.length - 1; i >= 0; i--) {
v = (v * 256) + (ba[i] & 0xFF);
}
return v;
}
// calculate checksum 4b
private static long crc4(byte[] array)
{
long res = 0;
for (int i = 0; i < array.length; i++)
{
int c = array[i] & 0xFF;
res = (res << 1) ^ c;
res = res & 0xFFFFFFFFL;
}
return res;
}
// calculate checksum 1b
private static byte crc(byte[] array)
{
long res = 8606;
for (int i = 0; i < array.length; i++)
{
int c = array[i] & 0xFF;
res = (res << 1) ^ c;
res = res & 0xFFFFFFFFL;
}
return (byte) (res & 0xFF);
}
private static byte[] challenge(String networkKey)
{
byte[] c = toByteArray(System.currentTimeMillis());
// gen CRC
long crc = crc4(c);
// and in front of challenge
byte[] cRet = new byte[c.length + 4];
cRet[0] = (byte)(crc & 0xFF);
cRet[1] = (byte)(crc >> 8 & 0xFF);
cRet[2] = (byte)(crc >> 16 & 0xFF);
cRet[3] = (byte)(crc >> 24 & 0xFF);
System.arraycopy(c, 0, cRet, 4, c.length);
// encrypt
return xxteaEncrypt(cRet, fromHex(networkKey));
}
// id integer. network_key in HEX format 32 chars
private static String getDataRequest(long id, String networkKey)
{
// gen challenge
byte[] c = challenge(networkKey);
StringBuilder sb = new StringBuilder();
sb.append(new Long(id).toString()).append('-').append(toHex(c).toUpperCase());
return sb.toString();
}
// id integer, data byte array, network_key in HEX format 32 chars, private_key 16 bytes array
private static String setDataRequest(long id, byte[] data, String networkKey, byte[] privateKey)
{
// gen challenge
byte[] c = challenge(networkKey);
byte crc = crc(data);
byte[] dataCRC = new byte[data.length + 1];
dataCRC[0] = crc;
System.arraycopy(data, 0, dataCRC, 1, data.length);
StringBuilder sb = new StringBuilder();
sb.append(new Long(id).toString()).append('-').append(toHex(c).toUpperCase()).append('-').append(toHex(xxteaEncrypt(dataCRC, privateKey)).toUpperCase());
return sb.toString();
}
// id integer, hist day index integer, network_key in HEX format 32 chars
private static String getDataHistRequest(long id, byte dayIdx, String networkKey)
{
// gen challenge
byte[] c = challenge(networkKey);
StringBuilder sb = new StringBuilder();
sb.append(new Long(id).toString()).append('-').append(new Byte(dayIdx).toString()).append('-').append(toHex(c).toUpperCase());
return sb.toString();
}
// id integer, from timestamp long, network_key in HEX format 32 chars
private static String getDataFromRequest(long id, long timestamp, String networkKey)
{
// gen challenge
byte[] c = challenge(networkKey);
StringBuilder sb = new StringBuilder();
sb.append(new Long(id).toString()).append('-').append(new Long(timestamp).toString()).append('-').append(toHex(c).toUpperCase());
return sb.toString();
}
private static int resultStart = 16;
private static int resultEnd = 2;
private static String server = "http://server.i4things.com:5408/";
/**********************************************************\
PUBLIC
\**********************************************************/
/**
* Use to decrypt received data
* @param data - Data to decrypt
* @param privateKey - Private key - byte array 16 elements
* @return Decrypted data
*/
public static byte[] Decrypt(byte[] data, byte[] privateKey)
{
return xxteaDecrypt(data, privateKey);
}
/**
* Use to request/receive all data for the current day from the server
*
* @param id - Node Id
* @param networkKey - Network key (HEX format 32 chars)
* @return - Data
*/
public static String GetData(long id, String networkKey) throws IOException
{
StringBuilder uri = new StringBuilder(server);
uri.append("iot_get/").append(getDataRequest(id,networkKey));
URL url = new URL(uri.toString());
URLConnection urlConn = url.openConnection();
urlConn.setConnectTimeout(30000);
urlConn.setReadTimeout(30000);
BufferedReader in = new BufferedReader( new InputStreamReader(urlConn.getInputStream()));
StringBuilder sr = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
{
sr.append(inputLine);
}
in.close();
String r = sr.toString().trim();
return r.substring(resultStart, r.length() - resultEnd);
}
/**
* Use to request/receive only last data received from the node
*
* @param id - Node Id
* @param networkKey - Network key (HEX format 32 chars)
* @return Data
*/
public static String GetLast(long id, String networkKey) throws IOException
{
StringBuilder uri = new StringBuilder(server);
uri.append("iot_get_last/").append(getDataRequest(id, networkKey));
URL url = new URL(uri.toString());
URLConnection urlConn = url.openConnection();
urlConn.setConnectTimeout(30000);
urlConn.setReadTimeout(30000);
BufferedReader in = new BufferedReader( new InputStreamReader(urlConn.getInputStream()));
StringBuilder sr = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
{
sr.append(inputLine);
}
in.close();
String r = sr.toString().trim();
return r.substring(resultStart, r.length() - resultEnd);
}
/**
* Use to request/receive history data for specific day
*
* @param id - Node Id
* @param day - Day for which the data is requested - 0 yesterday, 1 - the day before yesterday etc.
* @param networkKey - Network key (HEX format 32 chars)</param>
* @return Data
*/
public static String GetHist(long id, int day, String networkKey) throws IOException
{
StringBuilder uri = new StringBuilder(server);
uri.append("iot_get_hist/").append(getDataHistRequest(id, (byte)day, networkKey));
URL url = new URL(uri.toString());
URLConnection urlConn = url.openConnection();
urlConn.setConnectTimeout(30000);
urlConn.setReadTimeout(30000);
BufferedReader in = new BufferedReader( new InputStreamReader(urlConn.getInputStream()));
StringBuilder sr = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
{
sr.append(inputLine);
}
in.close();
String r = sr.toString().trim();
return r.substring(resultStart, r.length() - resultEnd);
}
/**
* Use to request/receive all data after a timestamp from the current day from the server
*
* @param id - Node Id
* @param from - timestamp in millis after 1,1,1970 in UTC
* @param networkKey - Network key (HEX format 32 chars)
* @return Data
*/
public static String GetFrom(long id, long from, String networkKey) throws IOException
{
StringBuilder uri = new StringBuilder(server);
uri.append("iot_get_from/").append(getDataFromRequest(id, from, networkKey));
URL url = new URL(uri.toString());
URLConnection urlConn = url.openConnection();
urlConn.setConnectTimeout(30000);
urlConn.setReadTimeout(30000);
BufferedReader in = new BufferedReader( new InputStreamReader(urlConn.getInputStream()));
StringBuilder sr = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
{
sr.append(inputLine);
}
in.close();
String r = sr.toString().trim();
return r.substring(resultStart, r.length() - resultEnd);
}
/**
* Use to send data to node
* @param id - Node Id
* @param data - Data to be sent - byte array - the data will be signed and encrypted and checked at the node automatically
* @param networkKey - Network key (HEX format 32 chars)
* @param privateKey - Private key - byte array 16 elements
* @return null - all good else error
*/
public static String SetData(long id, byte[] data, String networkKey, byte[] privateKey) throws IOException
{
StringBuilder uri = new StringBuilder(server);
uri.append("iot_set/").append(setDataRequest(id, data, networkKey, privateKey));
URL url = new URL(uri.toString());
URLConnection urlConn = url.openConnection();
urlConn.setConnectTimeout(30000);
urlConn.setReadTimeout(30000);
BufferedReader in = new BufferedReader( new InputStreamReader(urlConn.getInputStream()));
StringBuilder sr = new StringBuilder();
String inputLine;
while ((inputLine = in.readLine()) != null)
{
sr.append(inputLine);
}
in.close();
String r = sr.toString().trim();
if (r.indexOf("OK") >= 0)
{
return null;
}
else
{
return r.substring(resultStart, r.length() - resultEnd);
}
}
}