public LoRaPayloadJoinAccept(string netId, string appKey, byte[] devAddr, byte[] appNonce, byte[] dlSettings, byte[] rxDelay, byte[] cfList)
{
int cfListLength = cfList == null ? 0 : cfList.Length;
RawMessage = new byte[1 + 12 + cfListLength];
Mhdr = new Memory <byte>(RawMessage, 0, 1);
Array.Copy(new byte[] { 32 }, 0, RawMessage, 0, 1);
AppNonce = new Memory <byte>(RawMessage, 1, 3);
Array.Copy(appNonce, 0, RawMessage, 1, 3);
NetID = new Memory <byte>(RawMessage, 4, 3);
Array.Copy(ConversionHelper.StringToByteArray(netId), 0, RawMessage, 4, 3);
DevAddr = new Memory <byte>(RawMessage, 7, 4);
Array.Copy(devAddr, 0, RawMessage, 7, 4);
DlSettings = new Memory <byte>(RawMessage, 11, 1);
Array.Copy(dlSettings, 0, RawMessage, 11, 1);
RxDelay = new Memory <byte>(RawMessage, 12, 1);
Array.Copy(rxDelay, 0, RawMessage, 12, 1);
// set payload Wrapper fields
if (cfListLength > 0)
{
CfList = new Memory <byte>(RawMessage, 13, cfListLength);
Array.Copy(cfList, 0, RawMessage, 13, cfListLength);
}
// cfList = StringToByteArray("184F84E85684B85E84886684586E8400");
Fcnt = BitConverter.GetBytes(0x01);
if (BitConverter.IsLittleEndian)
{
AppNonce.Span.Reverse();
NetID.Span.Reverse();
DevAddr.Span.Reverse();
}
var algoinput = Mhdr.ToArray().Concat(AppNonce.ToArray()).Concat(NetID.ToArray()).Concat(DevAddr.ToArray()).Concat(DlSettings.ToArray()).Concat(RxDelay.ToArray()).ToArray();
if (!CfList.Span.IsEmpty)
{
algoinput = algoinput.Concat(CfList.ToArray()).ToArray();
}
CalculateMic(appKey, algoinput);
PerformEncryption(appKey);
}
public override byte[] PerformEncryption(string appSkey)
{
byte[] pt;
if (!CfList.Span.IsEmpty)
{
pt = AppNonce.ToArray().Concat(NetID.ToArray()).Concat(DevAddr.ToArray()).Concat(DlSettings.ToArray()).Concat(RxDelay.ToArray()).Concat(CfList.ToArray()).Concat(Mic.ToArray()).ToArray();
}
else
{
pt = AppNonce.ToArray().Concat(NetID.ToArray()).Concat(DevAddr.ToArray()).Concat(DlSettings.ToArray()).Concat(RxDelay.ToArray()).Concat(Mic.ToArray()).ToArray();
}
Aes aes = new AesManaged();
aes.Key = ConversionHelper.StringToByteArray(appSkey);
aes.IV = new byte[16];
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.None;
ICryptoTransform cipher;
cipher = aes.CreateDecryptor();
var encryptedPayload = cipher.TransformFinalBlock(pt, 0, pt.Length);
RawMessage = new byte[encryptedPayload.Length];
Array.Copy(encryptedPayload, 0, RawMessage, 0, encryptedPayload.Length);
return(encryptedPayload);
}
