plusOne()

src/main/java/com/josh/vku2f/IDSecret.java

@@ -160,6 +160,27 @@ public class IDSecret {
 		return encoder.getCurrentOffset();
 	}
 
+	/**
+	 * plus one to an unsigned integer byte array
+	 * @param input unsigned integer
+	 */
+	public void plusOne(byte[] input){
+		short i = (short)(input.length-1);
+		byte bitFlag = (byte)0x01;
+		while(i>=0){
+			input[i]^=bitFlag;
+			if((input[i]&bitFlag)==bitFlag)
+				break;
+			else{
+				bitFlag <<= 1;
+				if(bitFlag==0){
+					bitFlag=(byte)0x01;
+					i--;
+				}
+			}
+		}
+	}
+
 	private void testSharedObjects(byte[] apduBuffer){
 
 		byte[] aid = new byte[]{(byte)0xa0,(byte)0x00,(byte)0x00,(byte)0x02,(byte)0x47,(byte)0x10,(byte)0x01};