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OTG: UsbTransport minor refactoring

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This commit is contained in:
Nikita Mikhailov
2016-04-09 17:28:44 +06:00
parent 6ad2676e8c
commit 409c38ba2a
1 changed files with 22 additions and 11 deletions
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33
OpenKeychain/src/main/java/org/sufficientlysecure/keychain/smartcard/UsbTransport.java
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@@ -50,7 +50,7 @@ public class UsbTransport implements Transport {
* @throws UsbTransportException
*/
private void iccPowerSet(boolean on) throws UsbTransportException {
final byte[] iccPowerOn = {
final byte[] iccPowerCommand = {
(byte) (on ? 0x62 : 0x63),
0x00, 0x00, 0x00, 0x00,
0x00,
@@ -58,8 +58,13 @@ public class UsbTransport implements Transport {
0x00,
0x00, 0x00
};
sendRaw(iccPowerOn);
receive();
sendRaw(iccPowerCommand);
byte[] bytes;
do {
bytes = receive();
} while (isDataBlockNotReady(bytes));
checkDataBlockResponse(receive());
}
/**
@@ -174,19 +179,25 @@ public class UsbTransport implements Transport {
*/
@Override
public byte[] transceive(byte[] data) throws UsbTransportException {
send(data);
sendXfrBlock(data);
byte[] bytes;
do {
bytes = receive();
} while (isXfrBlockNotReady(bytes));
} while (isDataBlockNotReady(bytes));
checkXfrBlockResult(bytes);
checkDataBlockResponse(bytes);
// Discard header
return Arrays.copyOfRange(bytes, 10, bytes.length);
}
private void send(byte[] d) throws UsbTransportException {
int l = d.length;
/**
* Transmits XfrBlock
* 6.1.4 PC_to_RDR_XfrBlock
* @param payload payload to transmit
* @throws UsbTransportException
*/
private void sendXfrBlock(byte[] payload) throws UsbTransportException {
int l = payload.length;
byte[] data = Arrays.concatenate(new byte[]{
0x6f,
(byte) l, (byte) (l >> 8), (byte) (l >> 16), (byte) (l >> 24),
@@ -194,7 +205,7 @@ public class UsbTransport implements Transport {
mCounter++,
0x00,
0x00, 0x00},
d);
payload);
int send = 0;
while (send < data.length) {
@@ -239,14 +250,14 @@ public class UsbTransport implements Transport {
return (byte) ((bytes[7] >> 6) & 0x03);
}
private void checkXfrBlockResult(byte[] bytes) throws UsbTransportException {
private void checkDataBlockResponse(byte[] bytes) throws UsbTransportException {
final byte status = getStatus(bytes);
if (status != 0) {
throw new UsbTransportException("USB-CCID error: status " + status + " error code: " + Hex.toHexString(bytes, 8, 1));
}
}
private boolean isXfrBlockNotReady(byte[] bytes) {
private boolean isDataBlockNotReady(byte[] bytes) {
return getStatus(bytes) == 2;
}