SSL/TLS通信加密解密示例代码

该示例代码演示了如何使用Java的javax.net.ssl包中的SSLEngine类实现SSL/TLS通信的加密和解密过程。实现方式为使用SSLEngine进行SSL握手并获取加密解密工具，对发送和接收的数据进行加密和解密。

import javax.net.ssl.*;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;

public class SSLEngineExample {
    public static void main(String[] args) throws Exception {
        SSLContext sslContext = SSLContext.getDefault();
        SSLEngine sslEngine = sslContext.createSSLEngine();
        SslUtils.initSslEngine(sslEngine);

        ByteBuffer plainBuffer = ByteBuffer.allocate(1024);
        ByteBuffer encryptedBuffer = ByteBuffer.allocate(1024);

        // 进行SSL握手
        SSLSession session = sslEngine.getSession();
        plainBuffer.flip();
        SslUtils.writeSslData(sslEngine, plainBuffer, encryptedBuffer);
        SslUtils.readSslData(sslEngine, encryptedBuffer, plainBuffer);

        // 加密发送数据
        SocketChannel socketChannel = SocketChannel.open();
        socketChannel.configureBlocking(false);
        socketChannel.connect(); 
        socketChannel.write(encryptedBuffer);

        // 解密接收数据
        int bytesRead = socketChannel.read(encryptedBuffer);
        encryptedBuffer.flip();
        SslUtils.readSslData(sslEngine, encryptedBuffer, plainBuffer);
    }
}

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