NeoPGPApplet: rework historicalBytes

Break the bytes down into individual bits and don't report the extended
length capability if we don't provide our own buffer. We don't need it
then.

Signed-off-by: Michael Walle <[email protected]>

src/cc/walle/neopgp/NeoPGPApplet.java

@@ -408,15 +408,29 @@ public void process(APDU apdu) {
  }
 
  private short getHistoricalBytes(byte[] buf, short off) {
+ byte tmp;
+
  buf[off++] = (byte)0x00;
+
  /* cTLV 0x73 */
  buf[off++] = (byte)0x73;
  buf[off++] = (byte)0x00;
  buf[off++] = (byte)0x00;
- buf[off++] = (byte)0x60;
+
+ tmp = (byte)(0 << 7) | /* Command chaining supported */
+ (byte)(0 << 5) | /* Extended length info in EF.ATR */
+ (byte)(0 << 3) | /* Logical channel number */
+ (byte)(0 << 0); /* Maximal logical channels */
+
+ /* Extended length supported */
+ if (tmpBuffer != null)
+ tmp |= (byte)(1 << 6);
+ buf[off++] = tmp;
+
  /* cTLV 0x31 */
  buf[off++] = (byte)0x31;
  buf[off++] = (byte)0xde;
+
  /* LCS */
  if (cardTerminated)
  buf[off++] = (byte)0x03;