Export Control Notice: This source code is subject to the U.S. Export Administration Regulations and other U.S. law, and may not be exported or re-exported to certain countries (currently Afghanistan (Taliban-controlled areas), Cuba, Iran, Iraq, Libya, North Korea, Serbia (except Kosovo), Sudan and Syria) or to persons or entities prohibited from receiving U.S. exports (including Denied Parties, entities on the Bureau of Export Administration Entity List, and Specially Designated Nationals). Warning: If you are in the United States, please do not mirror this encryption source code unless you fully understand the U.S. export regulations. We are working on a plan to simplify life for our mirror sites and hope to announce it soon. People in other countries may face similar restrictions.