/// <summary>
/// Process FSEARCH instruction (CC2).
/// <para>
/// C-APDU: <code>00 B0 {P1-P2: offset} 04</code>
/// </para>
/// <para>
/// R-APDU when an EF is selected: <code>{offset} {number of word in current EF} {looked-up word}</code>
/// </para>
/// <para>
/// R-APDU when no EF is selected: <code>{offset} {number of word in current DF} {looked-up word}</code>
/// </para>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessFSearch(CommandAPDU apdu)
{
// get offset
byte[] buffer = apdu.GetBuffer();
short offset = Util.getShort(buffer, JavaCard.ISO7816.OFFSET_P1); // in WORDS
// get le
short le = apdu.SetOutgoing(); // in BYTES
if (le != 0)
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
short wordCount;
short offsetFound = offset;
// check that there is a current EF
if (_currentEF != null)
{
wordCount = (short)(_currentEF.GetLength() - _currentEF.GetHeaderSize());
while (!(_currentEF.IsAvailable(offsetFound, 1) || offsetFound == wordCount))
{
offsetFound++;
}
}
else
{
wordCount = (short)(_currentDF.GetLength() - _currentDF.GetHeaderSize());
while (!(_currentDF.IsAvailable(offsetFound, 1) || offsetFound == wordCount))
{
offsetFound++;
}
}
// check that there is still some empty space
if (offsetFound == wordCount)
{
ISOException.throwIt(Constants.SW_DATA_NOT_FOUND);
}
// copy answer in buffer
Util.setShort(buffer, 0, offsetFound);
Util.setShort(buffer, 2, wordCount);
Util.arrayFillNonAtomic(buffer, 4, 4, (byte)MemoryState.Free);
// and send it!
return(apdu.SetOutgoingAndSend(0, 8));
}
/// <summary>
/// Process GENERATE RANDOM instruction (CC2)
/// <para>
/// C-APDU: <code>00 C4 00 00 08</code>
/// </para>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessGenerateRandom(CommandAPDU apdu)
{
byte[] apduBuffer = apdu.GetBuffer();
short le = apdu.SetOutgoing();
// verify that Le='08'
if (le != 8)
{
// if not => error
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
// generate 8 random bytes
var rndGen = new RNGCryptoServiceProvider();
rndGen.GetBytes(apduBuffer, 0, 8);
// and send it!
return(apdu.SetOutgoingAndSend(0, 8));
}
/// <summary>
/// Process READ BINARY instruction (CC2)
/// <para>
/// C-APDU: <code>00 B0 {P1-P2: offset} {Le}</code>
/// </para>
/// <para>
/// R-APDU when an EF is selected: <code>{data in EF}</code>
/// </para>
/// <para>
/// R-APDU when no EF is selected: <code>{headers of EF in current DF}</code>
/// </para>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessRead(CommandAPDU apdu)
{
short le = apdu.SetOutgoing(); // in BYTES
short wordCount = (short)((short)(le + 3) / 4);
byte[] buffer = JCSystem.makeTransientByteArray((short)(wordCount * 4), JCSystem.CLEAR_ON_DESELECT);
short offset;
if (_currentEF != null)
{
// an EF is selected ==> read binary
offset = Util.getShort(apdu.GetBuffer(), JavaCard.ISO7816.OFFSET_P1); // in WORDS
byte[] header = JCSystem.makeTransientByteArray(8, JCSystem.CLEAR_ON_DESELECT);
_currentEF.GetHeader(header, 0);
_headerParser.Parse(header, 0, 8);
offset += (short)(_currentEF.Read(offset, buffer, 0, wordCount, _headerParser.fileType == HeaderParser.FILETYPE_EFSZ) << 2);
}
else
{
// no EF selected ==> DIR
offset = 0;
byte currentChildNumber = 0;
File fileChild = _currentDF.GetChild(currentChildNumber);
// get header of each file in current DF
while (fileChild != null && offset < le)
{
fileChild.GetHeader(buffer, offset);
offset += (short)(fileChild.GetHeaderSize() << 2);
fileChild = _currentDF.GetChild(++currentChildNumber);
}
}
// Pad with FF
Util.arrayFillNonAtomic(buffer, offset, (short)(le - offset), (byte)MemoryState.Free);
// and send data!
apdu.SetOutgoingLength(le);
return(apdu.SendBytesLong(buffer, 0, le));
}