Implemented password hashing

With the help of Argon2 lib

build.gradle

@@ -23,7 +23,7 @@ dependencies {
 	modCompile "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
 
     // Argon2 library for password hashing
-	compile 'de.mkammerer:argon2-jvm-nolibs:2.6'
+	compile 'de.mkammerer:argon2-jvm:2.6'
 
 	// IDEA stuff
 	implementation 'org.jetbrains:annotations:15.0'

src/main/java/org/samo_lego/simpleauth/SimpleAuth.java

@@ -1,5 +1,7 @@
 package org.samo_lego.simpleauth;
 
+import de.mkammerer.argon2.Argon2;
+import de.mkammerer.argon2.Argon2Factory;
 import net.fabricmc.api.DedicatedServerModInitializer;
 import net.fabricmc.fabric.api.event.player.AttackBlockCallback;
 import net.fabricmc.fabric.api.registry.CommandRegistry;
@@ -29,9 +31,9 @@ public class SimpleAuth implements DedicatedServerModInitializer {
 
 		// Creating data directory (database is stored there)
 		File file = new File("./mods/SimpleAuth");
-		if (!file.exists() && !file.mkdir()) {
+		if (!file.exists() && !file.mkdir())
 		    LOGGER.error("Error creating directory");
-		}
+
 
 		// Registering the commands
 		CommandRegistry.INSTANCE.register(false, dispatcher -> {

src/main/java/org/samo_lego/simpleauth/commands/LoginCommand.java

@@ -2,6 +2,8 @@ package org.samo_lego.simpleauth.commands;
 
 import com.mojang.brigadier.CommandDispatcher;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import de.mkammerer.argon2.Argon2;
+import de.mkammerer.argon2.Argon2Factory;
 import net.minecraft.server.command.ServerCommandSource;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.LiteralText;
@@ -15,8 +17,11 @@ import static net.minecraft.server.command.CommandManager.argument;
 import static net.minecraft.server.command.CommandManager.literal;
 
 public class LoginCommand {
-    private static LiteralText PleaseLogin = new LiteralText("§4Type /login <password> to login.");
+    private static LiteralText pleaseLogin = new LiteralText("§4Type /login <password> to login.");
-    private static TranslatableText EnterPassword = new TranslatableText("command.simpleauth.password");
+    private static TranslatableText enterPassword = new TranslatableText("command.simpleauth.password");
+    private static TranslatableText wrongPassword = new TranslatableText("command.simpleauth.wrongPassword");
+    private static TranslatableText alreadyAuthenticated = new TranslatableText("command.simpleauth.alreadyAuthenticated");
+    private static Text text = new LiteralText("You have entered login command");
 
     public static void registerCommand(CommandDispatcher<ServerCommandSource> dispatcher) {
         // Registering the "/login" command
@@ -25,23 +30,40 @@ public class LoginCommand {
                         .executes(ctx -> login(ctx.getSource(), getString(ctx, "password")) // Tries to authenticate user
                         ))
                 .executes(ctx -> {
-                    ctx.getSource().getPlayer().sendMessage(EnterPassword);
+                    ctx.getSource().getPlayer().sendMessage(enterPassword);
                     return 1;
                 }));
     }
+
     // Method called for checking the password
     private static int login(ServerCommandSource source, String pass) throws CommandSyntaxException {
-        String savedHashed = "judf"; // Hashed password provided upon registration
-
         // Getting the player who send the command
         ServerPlayerEntity player = source.getPlayer();
 
-        // Comparing hashed password with one from the file
+        if(SimpleAuth.isAuthenticated(player)) {
-        if(true/*BCrypt.checkpw(pass, savedHashed)*/){ //From database
+            player.sendMessage(alreadyAuthenticated);
-            Text text = new LiteralText(source.getName() + ", you have entered login command");
+        }
-            source.getMinecraftServer().getPlayerManager().broadcastChatMessage(text, false);
+        else {
+            // Create instance
+            Argon2 argon2 = Argon2Factory.create();
+            // Read password from user
+            char[] password = pass.toCharArray();
+
+            try {
+                // Hashed password from DB
+                String hashed = argon2.hash(10, 65536, 1, password);
+
+                // Verify password
+                if (argon2.verify(hashed, password)) {
                     SimpleAuth.authenticatedUsers.add(player);
-            System.out.println(SimpleAuth.authenticatedUsers);
+                    player.sendMessage(text);
+                } else {
+                    player.sendMessage(wrongPassword);
+                }
+            } finally {
+                // Wipe confidential data
+                argon2.wipeArray(password);
+            }
         }
         return 1; // Success
     }

src/main/java/org/samo_lego/simpleauth/commands/RegisterCommand.java

@@ -1,14 +1,16 @@
 package org.samo_lego.simpleauth.commands;
 
-import com.google.common.io.Files;
 import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import de.mkammerer.argon2.Argon2;
+import de.mkammerer.argon2.Argon2Factory;
 import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.LiteralText;
 import net.minecraft.text.TranslatableText;
+import org.samo_lego.simpleauth.SimpleAuth;
 import org.samo_lego.simpleauth.database.SimpleAuthDatabase;
-
 import java.util.Objects;
-
 import static com.mojang.brigadier.arguments.StringArgumentType.getString;
 import static com.mojang.brigadier.arguments.StringArgumentType.word;
 import static net.minecraft.server.command.CommandManager.argument;
@@ -16,8 +18,9 @@ import static net.minecraft.server.command.CommandManager.literal;
 
 
 public class RegisterCommand {
-    private static TranslatableText PleaseRegister = new TranslatableText("§4Type /register <password> <password> to login.");
+    private static TranslatableText pleaseRegister = new TranslatableText("§4Type /register <password> <password> to login.");
-    private static TranslatableText EnterPassword = new TranslatableText("command.simpleauth.passwordTwice");
+    private static TranslatableText enterPassword = new TranslatableText("command.simpleauth.passwordTwice");
+    private static TranslatableText alreadyAuthenticated = new TranslatableText("command.simpleauth.alreadyAuthenticated");
 
     public static void registerCommand(CommandDispatcher<ServerCommandSource> dispatcher) {
 
@@ -28,25 +31,42 @@ public class RegisterCommand {
                     .executes( ctx -> register(ctx.getSource(), getString(ctx, "password"), getString(ctx, "passwordAgain")))
             ))
         .executes(ctx -> {
-            ctx.getSource().getPlayer().sendMessage(EnterPassword);
+            ctx.getSource().getPlayer().sendMessage(enterPassword);
             return 1;
         }));
     }
 
-    // Registering our "register" command (ik, sounds a bit confusing)
+    // Method called for hashing the password & writing to DB
-    private static int register(ServerCommandSource source, String pass1, String pass2) {
+    private static int register(ServerCommandSource source, String pass1, String pass2) throws CommandSyntaxException {
-        if(pass1.equals(pass2)){
+        ServerPlayerEntity player = source.getPlayer();
-            // Hashing the password
+        if(SimpleAuth.isAuthenticated(player)) {
-            SimpleAuthDatabase.insert(Objects.requireNonNull(source.getEntity()).getUuidAsString(), source.getName(), pass1);
+            player.sendMessage(alreadyAuthenticated);
-            source.getMinecraftServer().getPlayerManager().broadcastChatMessage(
+        }
-                    new LiteralText(source.getName() + ", you have registered successfully!"),
+        else if(pass1.equals(pass2)) { // Hashing the password with the Argon2 power
-                    false
+            // Create instance
+            Argon2 argon2 = Argon2Factory.create();
+
+            // Read password from user
+            char[] password = pass1.toCharArray();
+
+            try {
+                // Hash password
+                String hash = argon2.hash(10, 65536, 1, password);
+                // Writing into database
+                SimpleAuthDatabase.insert(Objects.requireNonNull(source.getEntity()).getUuidAsString(), source.getName(), hash);
+                SimpleAuth.authenticatedUsers.add(player);
+                // Letting the player know it was successful
+                player.sendMessage(
+                        new LiteralText(source.getName() + ", you have registered successfully!")
                 );
+            } finally {
+                // Wipe confidential data
+                argon2.wipeArray(password);
+            }
         }
         else
-            source.getMinecraftServer().getPlayerManager().broadcastChatMessage(
+            player.sendMessage(
-                new LiteralText(source.getName() + ", passwords must match!"),
+                new LiteralText(source.getName() + ", passwords must match!")
-                false
             );
         return 1;
     }

src/main/java/org/samo_lego/simpleauth/database/SimpleAuthDatabase.java

@@ -56,6 +56,7 @@ public class SimpleAuthDatabase {
                     "  `Username`  VARCHAR(16) NOT NULL,\n" +
                     "  `Password`  VARCHAR(64) NOT NULL,\n" +
                     "  UNIQUE (`UUID`)\n" +
+                    "  UNIQUE (`Username`)\n" +
                     ");";
             Statement stmt = conn.createStatement();
             stmt.execute(sql);
@@ -79,7 +80,23 @@ public class SimpleAuthDatabase {
             LOGGER.error(e.getMessage());
         }
     }
+    public void selectAll(){
+        String sql = "SELECT id, name, capacity FROM users";
 
+        try (Connection conn = this.connect();
+             Statement stmt  = conn.createStatement();
+             ResultSet rs    = stmt.executeQuery(sql)){
+
+            // loop through the result set
+            while (rs.next()) {
+                System.out.println(rs.getInt("id") +  "\t" +
+                        rs.getString("name") + "\t" +
+                        rs.getDouble("capacity"));
+            }
+        } catch (SQLException e) {
+            System.out.println(e.getMessage());
+        }
+    }
     private static void disconnect(Connection conn) {
         try {
             if (conn != null) {

src/main/resources/fabric.mod.json

@@ -3,14 +3,13 @@
   "id": "simpleauth",
   "version": "${version}",
 
-  "name": "Simple Authentication mod",
+  "name": "Simple Authentication Mod",
   "description": "A mod that tries to keep authentication for players simple via commands.",
   "authors": [
     "samo_lego"
   ],
   "contact": {
-    "homepage": "https://fabricmc.net/",
+    "sources": "https://github.com/samolego/SimpleAuth"
-    "sources": "https://github.com/FabricMC/fabric-example-mod"
   },
 
   "license": "MIT",