для работы с зашифрованным потоком

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/Crypter.java

@@ -0,0 +1,43 @@
+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-06-11
+ */
+package mc.core.network.proto_1_12_2;
+
+import lombok.extern.slf4j.Slf4j;
+
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.util.Random;
+
+@Slf4j
+public class Crypter {
+    private static final Crypter instance = new Crypter();
+    private KeyPair keyPair;
+    private byte[] verifyToken;
+
+    public static KeyPair getKeyPair() {
+        if (instance.keyPair == null) {
+            try {
+                KeyPairGenerator keypairgenerator = KeyPairGenerator.getInstance("RSA");
+                keypairgenerator.initialize(1024);
+                instance.keyPair = keypairgenerator.generateKeyPair();
+            } catch (NoSuchAlgorithmException e) {
+                log.error("WTF?! Algorithm \"RSA\" not defined?!", e);
+            }
+        }
+
+        return instance.keyPair;
+    }
+
+    public static byte[] getVerifyToken() {
+        if (instance.verifyToken == null) {
+            instance.verifyToken = new byte[4];
+            Random rand = new Random();
+            rand.nextBytes(instance.verifyToken);
+        }
+
+        return instance.verifyToken;
+    }
+}

proto_1.12.2/src/main/java/mc/core/network/proto_1_12_2/packets/EncryptionRequestPacket.java

@@ -0,0 +1,36 @@
+/*
+ * DmitriyMX <dimon550@gmail.com>
+ * 2018-06-11
+ */
+package mc.core.network.proto_1_12_2.packets;
+
+import lombok.AllArgsConstructor;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+import mc.core.network.SCPacket;
+import mc.core.network.proto_1_12_2.ByteArrayOutputNetStream;
+
+import java.security.PublicKey;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Setter
+public class EncryptionRequestPacket implements SCPacket {
+    private String serverId;
+    private PublicKey publicKey;
+    private byte[] verifyToken;
+
+    @Override
+    public byte[] toByteArray() {
+        ByteArrayOutputNetStream netStream = new ByteArrayOutputNetStream();
+
+        netStream.writeString(serverId);
+        byte[] bytes = publicKey.getEncoded();
+        netStream.writeVarInt(bytes.length);
+        netStream.writeBytes(bytes);
+        netStream.writeVarInt(verifyToken.length);
+        netStream.writeBytes(verifyToken);
+
+        return netStream.toByteArray();
+    }
+}