private static void LANuncipherV1(string[] args, bool DEBUG)
{
//conversion des arguments
string input_frame = args[3];
byte[] kmacbytes = Hex2Bytes(args[4].Substring(0, 32));
byte[] kencbytes = Hex2Bytes(args[5].Substring(0, 32));
//décodage l6
string l6 = input_frame.Substring(22, input_frame.Length - 26);
string l6ctrl = Convert.ToString(byte.Parse(l6.Substring(0, 2), System.Globalization.NumberStyles.HexNumber), 2).PadLeft(8, '0');
string lblL6Vers = l6ctrl.Substring(0, 3);
string lblL6Wts = l6ctrl.Substring(3, 1);
string lblL6KeySel = l6ctrl.Substring(4, 4);
//system.Console.WriteLine("Clé n° : " + Convert.ToInt32(lblL6KeySel.ToString(), 2).ToString());
//Décodage trame
int cfield = Int32.Parse(input_frame.Substring(2, 2), System.Globalization.NumberStyles.HexNumber);
string lblCField = cfield.ToString("X2");
string lblMField = input_frame.Substring(4, 4);
string lblAField = input_frame.Substring(8, 12);
string lblClField = input_frame.Substring(20, 2);
string lblL6OprID = l6.Substring(2, 2);
string lblL6Cpt = l6.Substring(4, 4);
string lblL6App = l6.Substring(8, 2);
string lblL6HashKmac = l6.Substring(l6.Length - 4, 4);
if (CRC_OK(input_frame, DEBUG) && hashKmac_OK(input_frame, kmacbytes, lblL6Vers, DEBUG) && hashKenc_OK(input_frame, kencbytes, lblL6Vers, DEBUG))
{
string l7 = l6.Substring(10, l6.Length - 26);
string txtIV = (lblMField.ToString() + lblAField.ToString() + lblL6Cpt.ToString() + lblCField.ToString()).PadRight(32, '0');
byte[] l7decipheredbytes = CAES128.AES_CTR(Hex2Bytes(l7), kencbytes, Hex2Bytes(txtIV));
string l7deciphered = Bytes2Hex(l7decipheredbytes, l7decipheredbytes.Length);
if (DEBUG)
{
System.Console.WriteLine("IV: " + txtIV + Environment.NewLine + Environment.NewLine + "L7 ciphered: " + l7);
}
System.Console.WriteLine("L7 unciphered: " + l7deciphered);
}
else
{
System.Console.WriteLine("Frame unciphering error");
}
}
private static void NFCDATAcipher(string[] args, bool DEBUG)
{
string data = args[1];
byte[] kencbytes = Hex2Bytes(args[2].Substring(0, 32));
string IV = (args[3].ToString().PadRight(32, '0'));
//chiffrement
byte[] DATAcipheredbytes = CAES128.AES_CTR(Hex2Bytes(data), kencbytes, Hex2Bytes(IV));
string DATAciphered = Bytes2Hex(DATAcipheredbytes, DATAcipheredbytes.Length);
//System.Console.WriteLine("LAN L7 ciphered: " + l7ciphered);
System.Console.WriteLine("CipheredData " + DATAciphered);
}
private static void LANcipherV0(string[] args, bool DEBUG)
{
string lblL6Vers = args[2];
string l7 = args[3];
byte[] kencbytes = Hex2Bytes(args[4].Substring(0, 32));
string lblMField = args[5];
string lblAField = args[6];
string lblL6Cpt = args[7];
string lblCField = args[8];
string lblL6Wts = "1";
string lblL6KeySel = Convert.ToString(Convert.ToInt32(args[9], 10), 2).PadLeft(4, '0');
string lblL6Ctrl = Convert.ToInt32(lblL6Vers + lblL6Wts + lblL6KeySel, 2).ToString("X2");
//System.Console.WriteLine("lblL6Ctrl : " + lblL6Ctrl);
//System.Console.WriteLine("l7: " + l7 + Environment.NewLine + "lblMField: " + lblMField + Environment.NewLine + "lblAField: " + lblAField + Environment.NewLine + "lblL6Cpt: " + lblL6Cpt + Environment.NewLine + "lblCField: " + lblCField + Environment.NewLine + "l7: " + l7 + Environment.NewLine);
//IV
string txtIV = (lblMField.ToString() + lblAField.ToString() + lblL6Cpt.ToString() + lblCField.ToString()).PadRight(32, '0');
//System.Console.WriteLine("computed IV: " + txtIV);
//chiffrement L7
byte[] l7cipheredbytes = CAES128.AES_CTR(Hex2Bytes(l7), kencbytes, Hex2Bytes(txtIV));
string l7ciphered = Bytes2Hex(l7cipheredbytes, l7cipheredbytes.Length);
//System.Console.WriteLine("LAN L7 ciphered: " + l7ciphered);
string lblCIField = "B4"; // imposée par la LAN
string lblL6HashKenc = "00000000"; //recalcule après
string lblL6Tstamp = "0000"; //recalculé par le K
string lblL6HashKmac = "0000"; //recalculé par le K
string CRC = "0000"; //recalculé par le K
//L-field
Int32 lfield_calc = 1 + 2 + 6 + 1 + 1 + 2 + l7.Length / 2 + 4 + lblL6Tstamp.Length / 2 + 2 + 2; // longeur de la trame du C-field au CRC inclu
string lblLField = lfield_calc.ToString("X2");
lblL6HashKenc = Bytes2Hex(CAES128.AES_CMAC(Hex2Bytes(lblLField + lblCField + lblMField + lblAField + lblCIField + lblL6Ctrl + lblL6Cpt + l7ciphered), kencbytes), 4);
//System.Console.WriteLine("lblL6HashKenc " + lblL6HashKenc);
string L2 = lblLField + lblCField + lblMField + lblAField + lblCIField + lblL6Ctrl + lblL6Cpt + l7ciphered + lblL6HashKenc + lblL6Tstamp + lblL6HashKmac + CRC;
System.Console.WriteLine("L2 " + L2);
}
private static void NFCuncipher(string[] args, bool DEBUG)
{
//input_NFCframe kmob NFCUid (8o)
string input_NFCframe = args[2];
byte[] kmobbytes = Hex2Bytes(args[3].Substring(0, 32));
string NFCuid = args[4];
string NFCLfield = input_NFCframe.Substring(0, 2);
string NFCcpt = input_NFCframe.Substring(2, 4);
string NFCCfield = input_NFCframe.Substring(6, 2);
string NFCNFCver = input_NFCframe.Substring(8, 2);
string NFCdata = input_NFCframe.Substring(10, input_NFCframe.Length - 22);
string NFChashkmob = input_NFCframe.Substring(input_NFCframe.Length - 12, 8);
string NFCCRC = input_NFCframe.Substring(input_NFCframe.Length - 4, 4);
/*
* System.Console.WriteLine("NFCLfield " + NFCLfield);
* System.Console.WriteLine("NFCcpt " + NFCcpt);
* System.Console.WriteLine("NFCCfield " + NFCCfield);
* System.Console.WriteLine("NFCNFCver " + NFCNFCver);
* System.Console.WriteLine("NFCdata " + NFCdata);
* System.Console.WriteLine("NFChashkmob " + NFChashkmob);
* System.Console.WriteLine("NFCCRC " + NFCCRC);
*/
//CRC vérification
if (CRC_OK(input_NFCframe, DEBUG))
{
//hashKmob vérification
string NFCinputhashkmob = (NFCuid.ToString() + NFCLfield.ToString() + NFCcpt.ToString() + NFCCfield.ToString() + NFCNFCver.ToString() + NFCdata.ToString());
string NFChashkmobcomputed = Bytes2Hex(CAES128.AES_CMAC(Hex2Bytes(NFCinputhashkmob), kmobbytes), 4);
if (DEBUG)
{
System.Console.WriteLine("NFChashkmobcomputed " + NFChashkmobcomputed.ToString().ToUpper() + " NFChashkmob_inframe " + NFChashkmob);
}
if (NFChashkmobcomputed.ToString().ToUpper() == NFChashkmob)
{
//déchiffrement
//calcul IV
string NFCIV = (NFCuid.ToString() + NFCcpt.ToString()).PadRight(32, '0');
if (DEBUG)
{
System.Console.WriteLine("NFCIV: " + NFCIV);
}
byte[] NFCdecipheredbytes = CAES128.AES_CTR(Hex2Bytes(NFCdata), kmobbytes, Hex2Bytes(NFCIV));
string NFCl7deciphered = Bytes2Hex(NFCdecipheredbytes, NFCdecipheredbytes.Length);
System.Console.WriteLine("NFC L7: " + NFCl7deciphered);
}
else
{
System.Console.WriteLine("Error HashKmob: HashKmob computed = " + NFChashkmobcomputed.ToString().ToUpper() + " HashKmob in frame = " + NFCinputhashkmob);
}
}
}
private static void LANcipherV1(string[] args, bool DEBUG)
{
string lblCField = args[8];
string lblMField = args[5];
string lblAField = args[6];
string lblCIField = args[12]; //"B4"; imposée par la LAN
string lblL6Vers = args[2];
string lblL6Wts = "0"; //champs reserved du L6Ctrl fixé à 0
string lblL6KeySel = Convert.ToString(Convert.ToInt32(args[9], 10), 2).PadLeft(4, '0');
string lblL6Ctrl = Convert.ToInt32(lblL6Vers + lblL6Wts + lblL6KeySel, 2).ToString("X2");
string lblL6OprID = args[10];
string lblL6Cpt = args[7];
string lblL6App = args[11];
string l7 = args[3];
string lblL6HashKenc = "00000000"; //recalcule après
string lblL6Tstamp = args[13];
//string lblL6Tstamp = "0000"; //recalculé par le K
string lblL6HashKmac = "0000"; //recalculé par le K
string CRC = "0000"; //recalculé par le K
byte[] kencbytes = Hex2Bytes(args[4].Substring(0, 32));
byte[] kmacbytes = Hex2Bytes(args[14].Substring(0, 32));
//System.Console.WriteLine("l7: " + l7 + Environment.NewLine + "lblMField: " + lblMField + Environment.NewLine + "lblAField: " + lblAField + Environment.NewLine + "lblL6Cpt: " + lblL6Cpt + Environment.NewLine + "lblCField: " + lblCField + Environment.NewLine + "l7: " + l7 + Environment.NewLine);
//IV
string txtIV = (lblMField.ToString() + lblAField.ToString() + lblL6Cpt.ToString() + lblCField.ToString()).PadRight(32, '0');
if (DEBUG)
{
System.Console.WriteLine("computed IV: " + txtIV);
}
//chiffrement L7
byte[] l7cipheredbytes = CAES128.AES_CTR(Hex2Bytes(l7), kencbytes, Hex2Bytes(txtIV));
string l7ciphered = Bytes2Hex(l7cipheredbytes, l7cipheredbytes.Length);
if (DEBUG)
{
System.Console.WriteLine("LAN L7 ciphered: " + l7ciphered);
}
//L-field
Int32 lfield_calc = 1 + 2 + 6 + 1 + 1 + 1 + 2 + 1 + l7.Length / 2 + 4 + lblL6Tstamp.Length / 2 + 2 + 2; // longeur de la trame du C-field au CRC inclu
string lblLField = lfield_calc.ToString("X2");
//L6HashKenc
string block0Kenc = lblMField + lblAField + lblL6Cpt + "000000000000";
lblL6HashKenc = Bytes2Hex(CAES128.AES_CMAC(Hex2Bytes(block0Kenc + l7ciphered), kencbytes), 4);
if (DEBUG)
{
System.Console.WriteLine("lblL6HashKenc " + lblL6HashKenc);
}
//L6HashKmac
string HashKmacInput = lblL6Ctrl + lblL6OprID + lblL6Cpt + lblL6App + l7ciphered + lblL6HashKenc + lblL6Tstamp;
string block0Kmac = lblMField + lblAField + "0000000000000000";
string Cmacinput = block0Kmac + HashKmacInput;
if (DEBUG)
{
System.Console.WriteLine("full Cmacinput = " + Cmacinput);
}
byte[] Cmacinputbytes = Hex2Bytes(Cmacinput);
lblL6HashKmac = Bytes2Hex(CAES128.AES_CMAC(Cmacinputbytes, kmacbytes), 2);
if (DEBUG)
{
System.Console.WriteLine("lblL6HashKmac = " + lblL6HashKmac);
}
//CRC
string CRCinput = lblLField + lblCField + lblMField + lblAField + lblCIField + lblL6Ctrl + lblL6OprID + lblL6Cpt + lblL6App + l7ciphered + lblL6HashKenc + lblL6Tstamp + lblL6HashKmac;
byte[] CRCinputbytes = Hex2Bytes(CRCinput);
short CRCcomputed = CLibCRC.CalculateCRC16EN13757(CRCinputbytes);
CRC = CRCcomputed.ToString("X2");
if (DEBUG)
{
System.Console.WriteLine("CRC computed = " + CRC);
}
string L2 = lblLField + lblCField + lblMField + lblAField + lblCIField + lblL6Ctrl + lblL6OprID + lblL6Cpt + lblL6App + l7ciphered + lblL6HashKenc + lblL6Tstamp + lblL6HashKmac + CRC;
System.Console.WriteLine("L2 " + L2);
}