/**
* Constructor of DatumCode
*
* @param apSsid the Ap's ssid
* @param apBssid the Ap's bssid
* @param apPassword the Ap's password
* @param ipAddress the ip address of the phone or pad
* @param encryptor null use origin data, not null use encrypted data
*/
public DatumCode(byte[] apSsid, byte[] apBssid, byte[] apPassword,
IPAddress ipAddress, ITouchEncryptor encryptor)
{
// Data = total len(1 byte) + apPwd len(1 byte) + SSID CRC(1 byte) +
// BSSID CRC(1 byte) + TOTAL XOR(1 byte)+ ipAddress(4 byte) + apPwd + apSsid apPwdLen <=
// 105 at the moment
// total xor
char totalXor = (char)0;
char apPwdLen = (char)apPassword.Length;
CRC8 crc = new CRC8();
crc.update(apSsid);
char apSsidCrc = (char)crc.getValue();
crc.reset();
crc.update(apBssid);
char apBssidCrc = (char)crc.getValue();
char apSsidLen = (char)apSsid.Length;
byte[] ipBytes = ipAddress.GetAddressBytes();
int ipLen = ipBytes.Length;
char totalLen = (char)(EXTRA_HEAD_LEN + ipLen + apPwdLen + apSsidLen);
// build data codes
mDataCodes = new List <DataCode>();
mDataCodes.Add(new DataCode(totalLen, 0));
totalXor ^= totalLen;
mDataCodes.Add(new DataCode(apPwdLen, 1));
totalXor ^= apPwdLen;
mDataCodes.Add(new DataCode(apSsidCrc, 2));
totalXor ^= apSsidCrc;
mDataCodes.Add(new DataCode(apBssidCrc, 3));
totalXor ^= apBssidCrc;
// ESPDataCode 4 is null
for (int i = 0; i < ipLen; ++i)
{
char c = ByteUtil.convertByte2Uint8(ipBytes[i]);
totalXor ^= c;
mDataCodes.Add(new DataCode(c, i + EXTRA_HEAD_LEN));
}
for (int i = 0; i < apPassword.Length; i++)
{
char c = ByteUtil.convertByte2Uint8(apPassword[i]);
totalXor ^= c;
mDataCodes.Add(new DataCode(c, i + EXTRA_HEAD_LEN + ipLen));
}
// totalXor will xor apSsidChars no matter whether the ssid is hidden
for (int i = 0; i < apSsid.Length; i++)
{
char c = ByteUtil.convertByte2Uint8(apSsid[i]);
totalXor ^= c;
mDataCodes.Add(new DataCode(c, i + EXTRA_HEAD_LEN + ipLen + apPwdLen));
}
// add total xor last
mDataCodes.Insert(4, new DataCode(totalXor, 4));
// add bssid
int bssidInsertIndex = EXTRA_HEAD_LEN;
for (int i = 0; i < apBssid.Length; i++)
{
int index = totalLen + i;
char c = ByteUtil.convertByte2Uint8(apBssid[i]);
DataCode dc = new DataCode(c, index);
if (bssidInsertIndex >= mDataCodes.Count)
{
mDataCodes.Add(dc);
}
else
{
mDataCodes.Insert(bssidInsertIndex, dc);
}
bssidInsertIndex += 4;
}
}