diff --git a/java/craftlabs-auth-core/pom.xml b/java/craftlabs-auth-core/pom.xml
index 37b0cd2..492ebed 100644
--- a/java/craftlabs-auth-core/pom.xml
+++ b/java/craftlabs-auth-core/pom.xml
@@ -19,6 +19,10 @@
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
         </dependency>
+        <dependency>
+            <groupId>net.java.dev.jna</groupId>
+            <artifactId>jna</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
diff --git a/java/craftlabs-auth-core/src/main/java/cn/craftlabs/auth/internal/CraftCoreLibrary.java b/java/craftlabs-auth-core/src/main/java/cn/craftlabs/auth/internal/CraftCoreLibrary.java
new file mode 100644
index 0000000..3abc769
--- /dev/null
+++ b/java/craftlabs-auth-core/src/main/java/cn/craftlabs/auth/internal/CraftCoreLibrary.java
@@ -0,0 +1,53 @@
+package cn.craftlabs.auth.internal;
+
+import com.sun.jna.Library;
+import com.sun.jna.Native;
+import com.sun.jna.Pointer;
+import com.sun.jna.Structure;
+import java.util.Arrays;
+import java.util.List;
+
+public interface CraftCoreLibrary extends Library {
+    CraftCoreLibrary INSTANCE = Native.load("craftlabs_auth_core", CraftCoreLibrary.class);
+
+    class CraftResult extends Structure {
+        public int success;
+        public String message;
+
+        @Override
+        protected List<String> getFieldOrder() {
+            return Arrays.asList("success", "message");
+        }
+    }
+
+    class LicenseInfoStruct extends Structure {
+        public int isLicensed;
+        public long expirationDate;
+        public Pointer featureNames;
+        public Pointer featureValues;
+        public int featureCount;
+
+        @Override
+        protected List<String> getFieldOrder() {
+            return Arrays.asList("isLicensed", "expirationDate", "featureNames", "featureValues", "featureCount");
+        }
+    }
+
+    Pointer craft_initialize(String configJson);
+
+    void craft_destroy(Pointer handle);
+
+    CraftResult craft_activate(Pointer handle, String licenseKey);
+
+    CraftResult craft_check_license(Pointer handle);
+
+    LicenseInfoStruct craft_get_license_info(Pointer handle);
+
+    void craft_free_license_info(LicenseInfoStruct info);
+
+    int craft_has_feature(Pointer handle, String featureName);
+
+    CraftResult craft_release(Pointer handle);
+
+    CraftResult craft_heartbeat(Pointer handle);
+}
diff --git a/java/craftlabs-auth-core/src/main/java/cn/craftlabs/auth/internal/JnaAuthProvider.java b/java/craftlabs-auth-core/src/main/java/cn/craftlabs/auth/internal/JnaAuthProvider.java
new file mode 100644
index 0000000..dade941
--- /dev/null
+++ b/java/craftlabs-auth-core/src/main/java/cn/craftlabs/auth/internal/JnaAuthProvider.java
@@ -0,0 +1,89 @@
+package cn.craftlabs.auth.internal;
+
+import cn.craftlabs.auth.AuthProvider;
+import cn.craftlabs.auth.AuthResult;
+import cn.craftlabs.auth.LicenseInfo;
+import com.sun.jna.Native;
+import com.sun.jna.Pointer;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Map;
+
+public class JnaAuthProvider implements AuthProvider {
+    private Pointer nativeHandle;
+
+    @Override
+    public AuthResult initialize(String configJson) {
+        if (nativeHandle != null) {
+            CraftCoreLibrary.INSTANCE.craft_destroy(nativeHandle);
+        }
+        nativeHandle = CraftCoreLibrary.INSTANCE.craft_initialize(
+                configJson != null ? configJson : "{}");
+        return new AuthResult(nativeHandle != null, "Initialized");
+    }
+
+    @Override
+    public AuthResult activate(String licenseKey) {
+        CraftCoreLibrary.CraftResult r = CraftCoreLibrary.INSTANCE.craft_activate(
+                nativeHandle, licenseKey);
+        return new AuthResult(r.success != 0, r.message);
+    }
+
+    @Override
+    public AuthResult checkLicense() {
+        CraftCoreLibrary.CraftResult r = CraftCoreLibrary.INSTANCE.craft_check_license(nativeHandle);
+        return new AuthResult(r.success != 0, r.message);
+    }
+
+    @Override
+    public LicenseInfo getLicenseInfo() {
+        CraftCoreLibrary.LicenseInfoStruct s = CraftCoreLibrary.INSTANCE.craft_get_license_info(nativeHandle);
+        if (s == null) {
+            return new LicenseInfo(false, null, null);
+        }
+
+        Map<String, Boolean> features = null;
+        if (s.featureCount > 0 && s.featureNames != null) {
+            features = new HashMap<>(s.featureCount);
+            for (int i = 0; i < s.featureCount; i++) {
+                Pointer namePtr = s.featureNames.getPointer((long) i * Native.POINTER_SIZE);
+                String name = namePtr != null ? namePtr.getString(0) : null;
+                if (name != null) {
+                    int val = s.featureValues != null
+                            ? s.featureValues.getInt((long) i * Integer.BYTES)
+                            : 0;
+                    features.put(name, val != 0);
+                }
+            }
+        }
+
+        Date expirationDate = s.expirationDate > 0 ? new Date(s.expirationDate) : null;
+        CraftCoreLibrary.INSTANCE.craft_free_license_info(s);
+        return new LicenseInfo(s.isLicensed != 0, expirationDate, features);
+    }
+
+    @Override
+    public boolean hasFeature(String featureName) {
+        return CraftCoreLibrary.INSTANCE.craft_has_feature(nativeHandle, featureName) != 0;
+    }
+
+    @Override
+    public AuthResult release() {
+        CraftCoreLibrary.CraftResult r = CraftCoreLibrary.INSTANCE.craft_release(nativeHandle);
+        return new AuthResult(r.success != 0, r.message);
+    }
+
+    @Override
+    public AuthResult heartbeat() {
+        CraftCoreLibrary.CraftResult r = CraftCoreLibrary.INSTANCE.craft_heartbeat(nativeHandle);
+        return new AuthResult(r.success != 0, r.message);
+    }
+
+    @Override
+    public void close() {
+        if (nativeHandle != null) {
+            CraftCoreLibrary.INSTANCE.craft_destroy(nativeHandle);
+            nativeHandle = null;
+        }
+    }
+}
diff --git a/java/pom.xml b/java/pom.xml
index ddd2932..1e04e5b 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -51,6 +51,11 @@
                 <version>${json-schema-validator.version}</version>
                 <scope>test</scope>
             </dependency>
+            <dependency>
+                <groupId>net.java.dev.jna</groupId>
+                <artifactId>jna</artifactId>
+                <version>5.14.0</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>