/// <summary>组网加密</summary>
/// <param name="buffer"></param>
/// <param name="key"></param>
/// <returns></returns>
public Byte[] JoinEncrypt(Byte[] buffer, Byte[] key)
{
var size = buffer.Length;
var aes = new Aes128();
aes.SetKey(key);
var decBuffer = aes.Decrypt(buffer, 16);
//memset1(AesContext.ksch, '\0', 240);
//aes_set_key(key, 16, &AesContext);
//aes_decrypt(buffer, encBuffer, &AesContext);
// Check if optional CFList is included
if (size >= 16)
{
//aes_decrypt(buffer + 16, encBuffer + 16, &AesContext);
var decBuffer2 = aes.Decrypt(buffer.ReadBytes(16), 16);
decBuffer = decBuffer.Combine(decBuffer2);
}
return(decBuffer);
}
/// <summary>组网计算密钥</summary>
/// <param name="key"></param>
/// <param name="appNonce"></param>
/// <param name="devNonce"></param>
/// <param name="nwkSKey"></param>
/// <param name="appSKey"></param>
public void JoinComputeSKeys(Byte[] key, Byte[] appNonce, UInt16 devNonce, out Byte[] nwkSKey, out Byte[] appSKey)
{
var aes = new Aes128();
aes.SetKey(key);
//byte[] nonce = new byte[16];
//byte[] pDevNonce = devNonce;
//memset1(AesContext.ksch, '\0', 240);
//aes_set_key(key, 16, &AesContext);
//memset1(nonce, 0, sizeof(nonce));
//nonce[0] = 0x01;
//memcpy1(nonce + 1, appNonce, 6);
//memcpy1(nonce + 7, pDevNonce, 2);
//aes_encrypt(nonce, nwkSKey, &AesContext);
var nonce = new Byte[16];
nonce[0] = 0x01;
nonce.Write(1, appNonce);
nonce.Write(devNonce, 7);
nwkSKey = aes.Encrypt(nonce, 16);
//memset1(nonce, 0, sizeof(nonce));
//nonce[0] = 0x02;
//memcpy1(nonce + 1, appNonce, 6);
//memcpy1(nonce + 7, pDevNonce, 2);
//aes_encrypt(nonce, appSKey, &AesContext);
nonce = new Byte[16];
nonce[0] = 0x02;
nonce.Write(1, appNonce);
nonce.Write(devNonce, 7);
appSKey = aes.Encrypt(nonce, 16);
}
/// <summary>加密</summary>
/// <param name="buffer">数据缓冲区</param>
/// <param name="key">AES密钥</param>
/// <param name="address">帧地址</param>
/// <param name="dir">方向，0上行，1下行</param>
/// <param name="sequenceCounter">帧序号计数器</param>
public Byte[] PayloadEncrypt(Byte[] buffer, Byte[] key, UInt32 address, Boolean dir, UInt32 sequenceCounter)
{
var size = buffer.Length;
var aes = new Aes128();
aes.SetKey(key);
//using var aes = Aes.Create();
//using var aes = new RijndaelManaged();
//aes.Key = key;
//aes.IV = new Byte[16];
//aes.Mode = CipherMode.ECB;
//aes.Padding = PaddingMode.Zeros;
//XTrace.WriteLine("{0} {1}", aes.Mode, aes.Padding);
//var dec = aes.CreateDecryptor();
var aBlock = new Byte[] { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
//var sBlock = new byte[] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
aBlock[5] = (Byte)(dir ? 0 : 1);
aBlock[6] = (Byte)((address) & 0xFF);
aBlock[7] = (Byte)((address >> 8) & 0xFF);
aBlock[8] = (Byte)((address >> 16) & 0xFF);
aBlock[9] = (Byte)((address >> 24) & 0xFF);
aBlock[10] = (Byte)((sequenceCounter) & 0xFF);
aBlock[11] = (Byte)((sequenceCounter >> 8) & 0xFF);
aBlock[12] = (Byte)((sequenceCounter >> 16) & 0xFF);
aBlock[13] = (Byte)((sequenceCounter >> 24) & 0xFF);
//XTrace.WriteLine("aBlock: {0}", aBlock.ToHex());
var encBuffer = new Byte[size];
Byte bufferIndex = 0;
UInt16 ctr = 1;
//var sBlock = new Byte[16];
while (size >= 16)
{
aBlock[15] = (Byte)((ctr) & 0xFF);
ctr++;
//aes_encrypt(aBlock, sBlock, &AesContext);
var sBlock = aes.Encrypt(aBlock, 16);
//dec.TransformBlock(aBlock, 0, aBlock.Length, sBlock, sBlock.Length);
for (var i = 0; i < 16; i++)
{
encBuffer[bufferIndex + i] = (Byte)(buffer[bufferIndex + i] ^ sBlock[i]);
}
size -= 16;
bufferIndex += 16;
}
if (size > 0)
{
aBlock[15] = (Byte)((ctr) & 0xFF);
//aes_encrypt(aBlock, sBlock, &AesContext);
var sBlock = aes.Encrypt(aBlock, 16);
//sBlock = dec.TransformFinalBlock(aBlock, 0, aBlock.Length);
for (var i = 0; i < size; i++)
{
encBuffer[bufferIndex + i] = (Byte)(buffer[bufferIndex + i] ^ sBlock[i]);
}
}
return(encBuffer);
}
