diff --git a/nearby/service/Android.bp b/nearby/service/Android.bp
index 4982d1f..b33d593 100644
--- a/nearby/service/Android.bp
+++ b/nearby/service/Android.bp
@@ -60,4 +60,4 @@
     apex_available: [
         "com.android.nearby",
     ],
-}
\ No newline at end of file
+}
diff --git a/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Bytes.java b/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Bytes.java
new file mode 100644
index 0000000..637cd03
--- /dev/null
+++ b/nearby/service/java/com/android/server/nearby/common/bluetooth/fastpair/Bytes.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server.nearby.common.bluetooth.fastpair;
+
+import androidx.annotation.Nullable;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.ShortBuffer;
+import java.util.Arrays;
+
+/** Represents a block of bytes, with hashCode and equals. */
+public abstract class Bytes {
+    private static final char[] sHexDigits = "0123456789abcdef".toCharArray();
+    private final byte[] mBytes;
+
+    /**
+     * A logical value consisting of one or more bytes in the given order (little-endian, i.e.
+     * LSO...MSO, or big-endian, i.e. MSO...LSO). E.g. the Fast Pair Model ID is a 3-byte value,
+     * and a Bluetooth device address is a 6-byte value.
+     */
+    public static class Value extends Bytes {
+        private final ByteOrder mByteOrder;
+
+        /**
+         * Constructor.
+         */
+        public Value(byte[] bytes, ByteOrder byteOrder) {
+            super(bytes);
+            this.mByteOrder = byteOrder;
+        }
+
+        /**
+         * Gets bytes.
+         */
+        public byte[] getBytes(ByteOrder byteOrder) {
+            return this.mByteOrder.equals(byteOrder) ? getBytes() : reverse(getBytes());
+        }
+
+        private static byte[] reverse(byte[] bytes) {
+            byte[] reversedBytes = new byte[bytes.length];
+            for (int i = 0; i < bytes.length; i++) {
+                reversedBytes[i] = bytes[bytes.length - i - 1];
+            }
+            return reversedBytes;
+        }
+    }
+
+    Bytes(byte[] bytes) {
+        mBytes = bytes;
+    }
+
+    private static String toHexString(byte[] bytes) {
+        StringBuilder sb = new StringBuilder(2 * bytes.length);
+        for (byte b : bytes) {
+            sb.append(sHexDigits[(b >> 4) & 0xf]).append(sHexDigits[b & 0xf]);
+        }
+        return sb.toString();
+    }
+
+    /** Returns 2-byte values in the same order, each using the given byte order. */
+    public static byte[] toBytes(ByteOrder byteOrder, short... shorts) {
+        ByteBuffer byteBuffer = ByteBuffer.allocate(shorts.length * 2).order(byteOrder);
+        for (short s : shorts) {
+            byteBuffer.putShort(s);
+        }
+        return byteBuffer.array();
+    }
+
+    /** Returns the shorts in the same order, each converted using the given byte order. */
+    static short[] toShorts(ByteOrder byteOrder, byte[] bytes) {
+        ShortBuffer shortBuffer = ByteBuffer.wrap(bytes).order(byteOrder).asShortBuffer();
+        short[] shorts = new short[shortBuffer.remaining()];
+        shortBuffer.get(shorts);
+        return shorts;
+    }
+
+    /** @return The bytes. */
+    public byte[] getBytes() {
+        return mBytes;
+    }
+
+    @Override
+    public boolean equals(@Nullable Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof Bytes)) {
+            return false;
+        }
+        Bytes that = (Bytes) o;
+        return Arrays.equals(mBytes, that.mBytes);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(mBytes);
+    }
+
+    @Override
+    public String toString() {
+        return toHexString(mBytes);
+    }
+}