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document T1TpduProtocol slighly better

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This commit is contained in:
Vincent Breitmoser 2017-10-28 22:24:33 +02:00
parent 19dc0db89b
commit 8b07428ec0
1 changed files with 7 additions and 1 deletions
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8
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/tpdu/T1TpduProtocol.java
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@ -28,9 +28,14 @@ import org.sufficientlysecure.keychain.securitytoken.usb.CcidTransportProtocol;
import org.sufficientlysecure.keychain.securitytoken.usb.UsbTransportException;
import org.sufficientlysecure.keychain.util.Log;
/* T=1 Protocol, see http://www.icedev.se/proxmark3/docs/ISO-7816.pdf, Part 11 */
public class T1TpduProtocol implements CcidTransportProtocol {
private final static int MAX_FRAME_LEN = 254;
private static final byte PPS_PPPSS = (byte) 0xFF;
private static final byte PPS_PPS0_T1 = 1;
@SuppressWarnings("PointlessBitwiseExpression") // constructed per spec
private static final byte PPS_PCK = (byte) (PPS_PPPSS ^ PPS_PPS0_T1);
private CcidTransceiver ccidTransceiver;
private T1TpduBlockFactory blockFactory;
@ -53,7 +58,8 @@ public class T1TpduProtocol implements CcidTransportProtocol {
}
private void performPpsExchange() throws UsbTransportException {
byte[] pps = { (byte) 0xFF, 1, (byte) (0xFF ^ 1) };
// Perform PPS, see ISO-7816, Part 9
byte[] pps = { PPS_PPPSS, PPS_PPS0_T1, PPS_PCK };
CcidDataBlock response = ccidTransceiver.sendXfrBlock(pps);