internal Sector(MifareCard card, int sector)
{
_Card = card;
_Sector = sector;
_DataBlocks = new DataBlock[NumDataBlocks];
_Access = null;
}
/// <summary>
/// Sector access conditions
/// </summary>
public async Task <AccessConditions> Access()
{
if (_Access == null)
{
Byte[] data = await GetData(GetTrailerBlockIndex());
_Access = AccessBits.GetAccessConditions(data);
}
return(_Access);
}
/// <summary>
/// Calculate the 4 control bytes in the trailer datablock of each sector according to the given AccessConditions
/// </summary>
/// <param name="access">AccessConditions to encode</param>
/// <returns>a 4-bytes array</returns>
public static Byte[] CalculateAccessBits(AccessConditions access)
{
BitArray[] bitConds = new BitArray[4];
bitConds[0] = access.DataAreas[0].GetBits();
bitConds[1] = access.DataAreas[1].GetBits();
bitConds[2] = access.DataAreas[2].GetBits();
bitConds[3] = access.Trailer.GetBits();
PrintValues(bitConds[0], 8);
PrintValues(bitConds[1], 8);
PrintValues(bitConds[2], 8);
PrintValues(bitConds[3], 8);
// build a bit array for the first byte (byte 6 of trailer datablock)
BitArray byte6 = new BitArray(8);
byte6.Set(0, !bitConds[0].Get(0)); // ! C1-0
byte6.Set(1, !bitConds[1].Get(0)); // ! C1-1
byte6.Set(2, !bitConds[2].Get(0)); // ! C1-2
byte6.Set(3, !bitConds[3].Get(0)); // ! C1-3
byte6.Set(4, !bitConds[0].Get(1)); // ! C2-0
byte6.Set(5, !bitConds[1].Get(1)); // ! C2-1
byte6.Set(6, !bitConds[2].Get(1)); // ! C2-2
byte6.Set(7, !bitConds[3].Get(1)); // ! C2-3
// build a bit array for the second byte (byte 7 of trailer datablock)
BitArray byte7 = new BitArray(8);
byte7.Set(0, !bitConds[0].Get(2)); // ! C3-0
byte7.Set(1, !bitConds[1].Get(2)); // ! C3-1
byte7.Set(2, !bitConds[2].Get(2)); // ! C3-2
byte7.Set(3, !bitConds[3].Get(2)); // ! C3-3
byte7.Set(4, bitConds[0].Get(0)); // C1-0
byte7.Set(5, bitConds[1].Get(0)); // C1-1
byte7.Set(6, bitConds[2].Get(0)); // C1-2
byte7.Set(7, bitConds[3].Get(0)); // C1-3
// build a bit array for the third byte (byte 8 of trailer datablock)
BitArray byte8 = new BitArray(8);
byte8.Set(0, bitConds[0].Get(1)); // C2-0
byte8.Set(1, bitConds[1].Get(1)); // C2-1
byte8.Set(2, bitConds[2].Get(1)); // C2-2
byte8.Set(3, bitConds[3].Get(1)); // C2-3
byte8.Set(4, bitConds[0].Get(2)); // C3-0
byte8.Set(5, bitConds[1].Get(2)); // C3-1
byte8.Set(6, bitConds[2].Get(2)); // C3-2
byte8.Set(7, bitConds[3].Get(2)); // C3-3
// build GPB byte
BitArray byte9 = new BitArray(8);
if (access.MADVersion == AccessConditions.MADVersionEnum.Version1)
{
byte9.Set(0, true);
byte9.Set(1, false);
byte9.Set(7, true);
}
else if (access.MADVersion == AccessConditions.MADVersionEnum.Version2)
{
byte9.Set(0, false);
byte9.Set(1, true);
byte9.Set(7, true);
}
byte9.Set(6, access.MultiApplicationCard);
Byte[] bits = new Byte[4];
((ICollection)byte6).CopyTo(bits, 0);
//byte6.CopyTo(bits, 0);
((ICollection)byte7).CopyTo(bits, 1);
//byte7.CopyTo(bits, 1);
((ICollection)byte8).CopyTo(bits, 2);
// byte8.CopyTo(bits, 2);
((ICollection)byte9).CopyTo(bits, 3);
// byte9.CopyTo(bits, 3);
return(bits);
}
/// <summary>
/// Decode the 4 access control bytes
/// </summary>
/// <param name="data">a 4-bytes array to decode</param>
/// <returns>an initialized AccessConditions object</returns>
public static AccessConditions GetAccessConditions(Byte[] data)
{
BitArray byte6 = new BitArray(new Byte[] { 0xFF });
BitArray byte7 = new BitArray(new Byte[] { 0x07 });
BitArray byte8 = new BitArray(new Byte[] { 0x80 });
BitArray byte9 = new BitArray(new Byte[] { 0x69 });
if (data != null)
{
byte6 = new BitArray(new Byte[] { data[6] });
byte7 = new BitArray(new Byte[] { data[7] });
byte8 = new BitArray(new Byte[] { data[8] });
byte9 = new BitArray(new Byte[] { data[9] });
}
BitArray[] condBits = new BitArray[4];
condBits[0] = new BitArray(new bool[] {
byte7.Get(4), // C1-0
byte8.Get(0), // C2-0
byte8.Get(4) // C3-0
});
condBits[1] = new BitArray(new bool[] {
byte7.Get(5), // C1-1
byte8.Get(1), // C2-1
byte8.Get(5) // C3-1
});
condBits[2] = new BitArray(new bool[] {
byte7.Get(6), // C1-2
byte8.Get(2), // C2-2
byte8.Get(3) // C2-3
});
condBits[3] = new BitArray(new bool[] {
byte7.Get(7), // C1-3
byte8.Get(3), // C2-3
byte8.Get(7) // C3-3
});
AccessConditions access = new AccessConditions();
access.DataAreas[0].Initialize(condBits[0]);
access.DataAreas[1].Initialize(condBits[1]);
access.DataAreas[2].Initialize(condBits[2]);
access.Trailer.Initialize(condBits[3]);
access.MADVersion = AccessConditions.MADVersionEnum.NoMAD;
if (byte9.Get(7))
{
if (byte9.Get(0))
{
access.MADVersion = AccessConditions.MADVersionEnum.Version1;
}
if (byte9.Get(1))
{
access.MADVersion = AccessConditions.MADVersionEnum.Version2;
}
}
access.MultiApplicationCard = byte9.Get(6);
return(access);
}
