private static void serializeIVRecord(ByteBuffer outputBuffer, byte[] iv) {
      outputBuffer.putShort(IV_RECORD_VERSION_V_1);
      outputBuffer.putInt(iv.length);
      outputBuffer.put(iv);
    }
Serialize IV into {@link ByteBuffer}
@param outputBuffer the {@link ByteBuffer} to which the IV needs to be serialized
@param iv the iv of type byte array that needs to be serialized
ambry-router/src/main/java/com/github/ambry/router/GCMCryptoService.java