kafka的producer如何进行消息解密方式选择

Kafka Producer 本身不提供直接的消息解密功能，但你可以通过以下两种方式实现消息解密：

1. 在 Kafka Producer 端进行加密和解密：

   你可以在将消息发送到 Kafka 之前对其进行加密，然后在消费者端进行解密。这里以 Java 为例，使用 AES 加密算法进行加密和解密：

   • 首先，需要添加相关依赖。在 Maven 项目的 pom.xml 文件中添加以下依赖：

     
         org.apache.kafka
         kafka-clients
         2.8.0
     
     
         org.bouncycastle
         bcprov-jdk15on
         1.68
     
     

   • 然后，创建一个加密工具类：

     import javax.crypto.Cipher;
     import javax.crypto.spec.IvParameterSpec;
     import javax.crypto.spec.SecretKeySpec;
     import java.nio.charset.StandardCharsets;
     import java.util.Base64;
     
     public class AESUtil {
         private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
         private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";
         private static final String CHARSET = StandardCharsets.UTF_8.name();
         private static final String KEY_TYPE = "AES";
     
         public static String encrypt(String data, String key) throws Exception {
             SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(CHARSET), KEY_TYPE);
             IvParameterSpec ivParameterSpec = new IvParameterSpec("1234567812345678".getBytes(CHARSET));
             Cipher cipher = Cipher.getInstance(ALGORITHM);
             cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
             byte[] encryptedBytes = cipher.doFinal(data.getBytes(CHARSET));
             return Base64.getEncoder().encodeToString(encryptedBytes);
         }
     
         public static String decrypt(String data, String key) throws Exception {
             SecretKeySpec secretKeySpec = new SecretKeySpec(key.getBytes(CHARSET), KEY_TYPE);
             IvParameterSpec ivParameterSpec = new IvParameterSpec("1234567812345678".getBytes(CHARSET));
             Cipher cipher = Cipher.getInstance(ALGORITHM);
             cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);
             byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(data));
             return new String(decryptedBytes, CHARSET);
         }
     }
     

   • 在 Kafka Producer 中使用加密后的消息：

     import org.apache.kafka.clients.producer.KafkaProducer;
     import org.apache.kafka.clients.producer.ProducerRecord;
     
     public class EncryptedKafkaProducer {
         public static void main(String[] args) {
             Properties props = new Properties();
             props.put("bootstrap.servers", "localhost:9092");
             props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
             props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
     
             KafkaProducer producer = new KafkaProducer<>(props);
             String key = "your_key";
             String value = "https://www.yisu.com/ask/your_value";
             String encryptedValue = https://www.yisu.com/ask/AESUtil.encrypt(value, key);> record = new ProducerRecord<>("your_topic", key, encryptedValue);
             producer.send(record);
     
             producer.close();
         }
     }
     

   • 在 Kafka 消费者端进行解密：

     import org.apache.kafka.clients.consumer.ConsumerRecord;
     import org.apache.kafka.clients.consumer.ConsumerRecords;
     import org.apache.kafka.clients.consumer.KafkaConsumer;
     
     public class DecryptedKafkaConsumer {
         public static void main(String[] args) {
             Properties props = new Properties();
             props.put("bootstrap.servers", "localhost:9092");
             props.put("group.id", "your_group_id");
             props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
             props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
     
             KafkaConsumer consumer = new KafkaConsumer<>(props);
             consumer.subscribe(Arrays.asList("your_topic"));
     
             while (true) {
                 ConsumerRecords records = consumer.poll(Duration.ofMillis(100));
                 for (ConsumerRecord record : records) {
                     try {
                         String decryptedValue = https://www.yisu.com/ask/AESUtil.decrypt(record.value(),"your_key");
                         System.out.printf("Decrypted value: key = %s, value = https://www.yisu.com/ask/%s%n", record.key(), decryptedValue);
                     } catch (Exception e) {
                         e.printStackTrace();
                     }
                 }
             }
         }
     }
     

2. 使用 Kafka Streams 进行解密：

   如果你希望使用 Kafka Streams 进行解密，可以在消费者端使用 Kafka Streams API 对消息进行处理。这里以 Java 为例，使用 AES 解密算法进行解密：

   • 首先，需要添加相关依赖。在 Maven 项目的 pom.xml 文件中添加以下依赖：

     
         org.apache.kafka
         kafka-streams
         2.8.0
     
     
         org.bouncycastle
         bcprov-jdk15on
         1.68
     
     

   • 然后，创建一个 Kafka Streams 消费者：

     import org.apache.kafka.common.serialization.StringDeserializer;
     import org.apache.kafka.streams.KafkaStreams;
     import org.apache.kafka.streams.StreamsBuilder;
     import org.apache.kafka.streams.kstream.KStream;
     import org.apache.kafka.streams.kstream.KTable;
     import org.apache.kafka.streams.kstream.Materialized;
     import org.apache.kafka.streams.kstream.Produced;
     import org.apache.kafka.streams.state.Stores;
     import org.apache.kafka.streams.Topology;
     import org.apache.kafka.streams.kstream.Consumed;
     import org.bouncycastle.jce.provider.BouncyCastleProvider;
     import java.security.Security;
     import java.util.Arrays;
     import java.util.Properties;
     
     public class DecryptingKafkaStreamsConsumer {
         public static void main(String[] args) {
             Security.addProvider(new BouncyCastleProvider());
     
             Properties props = new Properties();
             props.put("bootstrap.servers", "localhost:9092");
             props.put("application.id", "decrypting-kafka-streams-consumer");
             props.put("key.deserializer", StringDeserializer.class.getName());
             props.put("value.deserializer", StringDeserializer.class.getName());
             props.put("group.id", "your_group_id");
     
             StreamsBuilder builder = new StreamsBuilder();
             KStream encryptedStream = builder.stream("your_topic");
     
             // Replace 'your_key' with the actual key used for encryption
             String key = "your_key";
             KTable decryptedTable = encryptedStream
                 .mapValues(value -> AESUtil.decrypt(value, key))
                 .toTable(Materialized.as("decrypted-store"));
     
             decryptedTable.toStream().to("decrypted_topic", Produced.with(StringSerializer.class, StringSerializer.class));
     
             KafkaStreams streams = new KafkaStreams(builder.build(), props);
             streams.start();
     
             // Add shutdown hook to gracefully close the Kafka Streams application
             Runtime.getRuntime().addShutdownHook(new Thread(streams::close));
         }
     }
     

   • 在上述示例中，我们创建了一个 Kafka Streams 消费者，从 “your_topic” 读取加密的消息，然后使用 AES 解密算法进行解密，并将解密后的消息发送到 “decrypted_topic”。请注意，你需要将 ‘your_key’ 替换为实际用于加密的密钥。