Initial project commit

lib/nightscout/com/eveningoutpost/dexdrip/G5Model/AuthRequestTxMessage.java

@@ -0,0 +1,50 @@
+package com.eveningoutpost.dexdrip.G5Model;
+
+import com.eveningoutpost.dexdrip.Models.JoH;
+import com.eveningoutpost.dexdrip.Models.UserError;
+
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+import java.util.UUID;
+
+import static com.eveningoutpost.dexdrip.utils.CipherUtils.getRandomKey;
+
+/**
+ * Created by joeginley on 3/16/16.
+ */
+@SuppressWarnings("FieldCanBeLocal")
+public class AuthRequestTxMessage extends BaseMessage {
+    public final byte opcode = 0x01;
+    public byte[] singleUseToken;
+    private final byte endByteStd = 0x2;
+    private final byte endByteAlt = 0x1;
+
+
+    public AuthRequestTxMessage(int token_size) {
+        this(token_size, false);
+    }
+
+    public AuthRequestTxMessage(int token_size, boolean alt) {
+        byte[] uuidBytes = getRandomKey();
+        final UUID uuid = UUID.nameUUIDFromBytes(uuidBytes);
+
+        try {
+            uuidBytes = uuid.toString().getBytes("UTF-8");
+        } catch (UnsupportedEncodingException e) {
+            e.printStackTrace();
+        }
+
+        final ByteBuffer bb = ByteBuffer.allocate(token_size);
+        bb.put(uuidBytes, 0, token_size);
+        singleUseToken = bb.array();
+
+        data = ByteBuffer.allocate(token_size + 2);
+        data.put(opcode);
+        data.put(singleUseToken);
+        data.put(alt ? endByteAlt : endByteStd);
+
+        byteSequence = data.array();
+        UserError.Log.d(TAG, "New AuthRequestTxMessage: " + JoH.bytesToHex(byteSequence));
+    }
+}
+