/**
* Generate an assymetric RSA key pair according to ISO7816-8, Section 5.1. We only support RSA
* 1024 bit at the moment, and return data in simple TLV data objects, tags 81 and 82.
*
* <p>Successful MSE command has to be performed prior to this one.
*/
private void processGenerateAssymetricKeyPair(APDU apdu) {
// This is only valid in state initial (at the moment)
if (state != STATE_INITIAL) {
ISOException.throwIt(SW_INS_NOT_SUPPORTED);
}
byte[] buf = apdu.getBuffer();
byte p1 = buf[OFFSET_P1];
byte p2 = buf[OFFSET_P2];
if (p1 != (byte) 0x80 || p2 != (byte) 0x00) {
ISOException.throwIt(SW_INCORRECT_P1P2);
}
if (currentPrivateKey[0] == null) {
ISOException.throwIt(SW_CONDITIONS_NOT_SATISFIED);
}
KeyPair pair = new KeyPair(tempKeyPublic, (RSAPrivateCrtKey) currentPrivateKey[0]);
pair.genKeyPair();
// Sanity check, the KeyPair class should regenerate the keys "in place".
if (pair.getPrivate() != currentPrivateKey[0] || pair.getPublic() != tempKeyPublic) {
ISOException.throwIt(SW_DATA_INVALID);
}
apdu.setOutgoing();
short len = (short) 0;
short offset = 0;
buf[offset++] = (byte) 0x81;
len = tempKeyPublic.getModulus(buf, (short) (offset + 2));
buf[offset++] = (byte) 0x81;
buf[offset++] = (byte) len;
offset += len;
buf[offset++] = (byte) 0x82;
len = tempKeyPublic.getExponent(buf, (short) (offset + 1));
buf[offset++] = (byte) len;
offset += len;
apdu.setOutgoingLength(offset);
apdu.sendBytes((short) 0, offset);
}
/** Process the GET CHALLENGE instruction (0x84) ISO 7816-4, Section 7.5.3 */
private void processGetChallenge(APDU apdu) {
if (state != STATE_PERSONALISED) {
ISOException.throwIt(SW_INS_NOT_SUPPORTED);
}
byte[] buf = apdu.getBuffer();
if (buf[OFFSET_P1] != 0x00 || buf[OFFSET_P2] != 0x00) {
ISOException.throwIt(SW_INCORRECT_P1P2);
}
short le = apdu.setOutgoing();
if (le == 0) {
ISOException.throwIt(SW_WRONG_LENGTH);
}
apdu.setOutgoingLength(le);
rd.generateData(buf, (short) 0, le);
apdu.sendBytes((short) 0, le);
}
/**
* Processes an incoming APDU.
*
* @see APDU
* @param apdu the incoming APDU
* @exception ISOException with the response bytes per ISO 7816-4
*/
public void process(APDU apdu) {
byte buffer[] = apdu.getBuffer();
short bytesRead = apdu.setIncomingAndReceive();
short echoOffset = (short) 0;
while (bytesRead > 0) {
Util.arrayCopyNonAtomic(buffer, ISO7816.OFFSET_CDATA, echoBytes, echoOffset, bytesRead);
echoOffset += bytesRead;
bytesRead = apdu.receiveBytes(ISO7816.OFFSET_CDATA);
}
apdu.setOutgoing();
apdu.setOutgoingLength((short) (echoOffset + 5));
// echo header
apdu.sendBytes((short) 0, (short) 5);
// echo data
apdu.sendBytesLong(echoBytes, (short) 0, echoOffset);
}