/// <summary>
/// Process ERASE instruction (CC3)
/// <para>
/// C-APDU: <code>00 0E {offset} {Lc} {length} </code>
/// </para>
/// <list type="table">
/// <item>
/// <term>offset</term>
/// <description>offset of first word of the file coded by P1 P2 (WORDS) to be erased.</description>
/// </item>
/// <item>
/// <term>length</term>
/// <description>number of words to be erased.</description>
/// </item>
/// </list>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessErase(CommandAPDU apdu)
{
// TODO: check ==> security of current EF
byte[] apduBuffer = apdu.GetBuffer();
apdu.SetIncomingAndReceive();
// Check if Lc ==2
short lc = APDUHelpers.getIncomingLength(apdu);
if (lc != 2)
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
short offset = Util.getShort(apduBuffer, JavaCard.ISO7816.OFFSET_P1); // in WORDS
short udcOffset = APDUHelpers.getOffsetCdata(apdu);
short length = Util.getShort(apduBuffer, udcOffset); // in WORDS
VerifyOutOfFile(offset, length);
_currentEF.Erase(offset, length);
return(FakeCardFeedback.FromSuccess(unchecked ((short)0x9000)));
}
/// <summary>
/// Process DELETE FILE instruction (E4)
/// <para>
/// C-APDU: <code>00 E4 00 00 02 {fid}</code>
/// </para>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessDeleteFile(CommandAPDU apdu)
{
byte[] buffer = apdu.GetBuffer();
_ = apdu.SetIncomingAndReceive();
short udcOffset = APDUHelpers.getOffsetCdata(apdu);
short lc = APDUHelpers.getIncomingLength(apdu);
if (lc != 2)
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_P1P2);
}
short fid = Util.getShort(buffer, udcOffset);
if (_currentDF.DeleteFile(fid) == false)
{
ISOException.throwIt(JavaCard.ISO7816.SW_FILE_NOT_FOUND);
}
if (_currentEF != null && fid == _currentEF.GetFileId())
{
_currentEF = null;
}
return(apdu.SetOutgoingAndSend(0, 0));
}
/// <summary>
/// Process SELECT instruction (CC4).
/// <para>
/// C-APDU: <code>00 A4 00 00 02 {FID} {Le}</code>
/// </para>
/// <para>
/// R-APDU: <code>{offset} {size} {header}</code>
/// </para>
/// <list type="table">
/// <item>
/// <term>offset</term>
/// <description>offset of first word of the file, 2 bytes (WORDS).</description>
/// </item>
/// <item>
/// <term>size</term>
/// <description>size of the body of the file (WORDS).</description>
/// </item>
/// </list>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessSelect(CommandAPDU apdu)
{
byte[] buffer = apdu.GetBuffer();
apdu.SetIncomingAndReceive();
short udcOffset = APDUHelpers.getOffsetCdata(apdu);
short lc = (short)apdu.Lc;
if (lc != 2)
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
short fid = Util.getShort(buffer, udcOffset);
File file;
if (fid == 0x3F00)
{
file = _masterFile;
}
else
{
file = _currentDF.FindFileByFileId(fid);
}
if (file == null)
{
ISOException.throwIt(JavaCard.ISO7816.SW_FILE_NOT_FOUND);
}
// Update current DF / EF
if (file.IsDF())
{
_currentDF = (DedicatedFile)file;
_currentEF = null;
}
else
{
_currentEF = (ElementaryFile)file;
}
// Build and send R-APDU
short headerSize = file.GetHeaderSize();
Util.setShort(buffer, 0, (short)(file._inParentBodyOffset >> 2));
Util.setShort(buffer, 2, (short)(file.GetLength() - headerSize));
file.GetHeader(buffer, 4);
// TODO Automagically adds 9000
return(apdu.SetOutgoingAndSend(0, (short)(4 + (headerSize << 2))));
}
/// <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 CREATE FILE instruction (E0)
/// <para>
/// C-APDU: <code>00 E0 {offset} {Lc} {header}</code>
/// </para>
/// <list type="table">
/// <item>
/// <term>offset</term>
/// <description>offset of first word of the file coded by P1 P2 (WORDS).</description>
/// </item>
/// <item>
/// <term>header</term>
/// <description>header of the new file, must be word aligned.</description>
/// </item>
/// </list>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessCreateFile(CommandAPDU apdu)
{
byte[] buffer = apdu.GetBuffer();
apdu.SetIncomingAndReceive();
short headerOffset = APDUHelpers.getOffsetCdata(apdu);
short headerLength = APDUHelpers.getIncomingLength(apdu);
if (headerLength < 4)
{
ISOException.throwIt(JavaCard.ISO7816.SW_DATA_INVALID);
}
short offset = Util.getShort(buffer, JavaCard.ISO7816.OFFSET_P1);
if (!_headerParser.Parse(buffer, headerOffset, (short)(headerOffset + headerLength)))
{
ISOException.throwIt(JavaCard.ISO7816.SW_DATA_INVALID);
}
short size = (short)(_headerParser.bodyLength + (short)(_headerParser.headerLength >> 2));
File file = null;
switch (_headerParser.fileType)
{
case HeaderParser.FILETYPE_DF:
file = _currentDF.CreateDedicatedFile(offset, size, buffer, headerOffset, headerLength);
break;
case HeaderParser.FILETYPE_EFSZ:
case HeaderParser.FILETYPE_EFWZ:
file = _currentDF.CreateElementaryFile(offset, size, buffer, headerOffset, headerLength);
break;
default:
ISOException.throwIt(JavaCard.ISO7816.SW_CONDITIONS_NOT_SATISFIED);
break;
}
if (file == null)
{
ISOException.throwIt(JavaCard.ISO7816.SW_DATA_INVALID);
}
return(apdu.SetOutgoingAndSend(0, 0));
}
/// <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));
}
private void VerifyOutOfFile(short offset, short length)
{
// Check if there is a current EF
if (_currentEF == null)
{
ISOException.throwIt(JavaCard.ISO7816.SW_CONDITIONS_NOT_SATISFIED);
}
short bodyLength = (short)(_currentEF.GetLength() - _currentEF.GetHeaderSize()); // in WORDS
// check if offset < bodyLength
if (offset >= bodyLength)
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_P1P2);
}
// check if offset+length <= bodyLength
if ((short)(offset + length) > bodyLength)
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
}
/// <summary>
/// Process WRITE BINARY instruction (CC3)
/// <para>
/// C-APDU: <code>00 B0 {offset} {Lc} {data} </code>
/// </para>
/// <list type="table">
/// <item>
/// <term>offset</term>
/// <description>offset of first word of the file coded by P1 P2 (WORDS) to be written.</description>
/// </item>
/// <item>
/// <term>data</term>
/// <description>data to be written in file.</description>
/// </item>
/// </list>
/// </summary>
/// <param name="apdu"></param>
/// <returns></returns>
private IFakeCardFeedback ProcessWrite(CommandAPDU apdu)
{
// TODO: check ==> security of current EF
byte[] apduBuffer = apdu.GetBuffer();
apdu.SetIncomingAndReceive();
short offset = Util.getShort(apduBuffer, JavaCard.ISO7816.OFFSET_P1); // in WORDS
short length = APDUHelpers.getIncomingLength(apdu); // in BYTES
short wordCount = (short)((short)(length + 3) / 4); // length in WORDS
// availability check
VerifyOutOfFile(offset, wordCount);
if (!_currentEF.IsAvailable(offset, wordCount))
{
ISOException.throwIt(JavaCard.ISO7816.SW_WRONG_LENGTH);
}
// copy data in a buffer
byte[] buffer = JCSystem.makeTransientByteArray((short)(wordCount * 4), JCSystem.CLEAR_ON_DESELECT);
short udcOffset = APDUHelpers.getOffsetCdata(apdu);
Util.arrayCopyNonAtomic(apduBuffer, udcOffset, buffer, 0, length);
// complete words with FF in buffer
short iMax = (short)(wordCount * 4);
for (short i = length; i < iMax; i++)
{
buffer[i] = 0xFF;
}
// and write data to file
_currentEF.Write(buffer, 0, offset, wordCount);
return(FakeCardFeedback.FromSuccess(unchecked ((short)0x9000)));
}