diff --git a/lib/src/main/java/com/github/orangegangsters/lollipin/lib/interfaces/ILockCallback.java b/lib/src/main/java/com/github/orangegangsters/lollipin/lib/interfaces/ILockCallback.java
new file mode 100644
index 00000000..09e0f3ff
--- /dev/null
+++ b/lib/src/main/java/com/github/orangegangsters/lollipin/lib/interfaces/ILockCallback.java
@@ -0,0 +1,8 @@
+package com.github.orangegangsters.lollipin.lib.interfaces;
+
+public interface ILockCallback {
+
+    boolean onCheckPasscode(String inputPasscode);
+
+    boolean onSetPasscode(String passcode);
+}
diff --git a/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLock.java b/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLock.java
index 6078666d..1ef56046 100644
--- a/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLock.java
+++ b/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLock.java
@@ -2,6 +2,8 @@
 
 import android.app.Activity;
 
+import com.github.orangegangsters.lollipin.lib.interfaces.ILockCallback;
+
 import java.util.HashSet;
 
 public abstract class AppLock {
@@ -102,6 +104,11 @@ public void removeIgnoredActivity(Class<?> clazz) {
      */
     public abstract void setShouldShowForgot(boolean showForgot);
 
+    /**
+     * set callback to be called when passcode is checked or set.
+     */
+    public abstract void setCallback(ILockCallback lockCallback);
+
     /**
      * Get whether the user backed out of the {@link AppLockActivity} previously
      */
@@ -170,6 +177,7 @@ public void removeIgnoredActivity(Class<?> clazz) {
 
     /**
      * Enable or disable fingerprint authentication on the PIN screen.
+     *
      * @param enabled If true, enables the fingerprint reader if it is supported.  If false, will
      *                hide the fingerprint reader icon on the PIN screen.
      */
diff --git a/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLockImpl.java b/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLockImpl.java
index a2b9d46e..24ef85d3 100644
--- a/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLockImpl.java
+++ b/lib/src/main/java/com/github/orangegangsters/lollipin/lib/managers/AppLockImpl.java
@@ -14,6 +14,7 @@
 import com.github.orangegangsters.lollipin.lib.PinFragmentActivity;
 import com.github.orangegangsters.lollipin.lib.encryption.Encryptor;
 import com.github.orangegangsters.lollipin.lib.enums.Algorithm;
+import com.github.orangegangsters.lollipin.lib.interfaces.ILockCallback;
 import com.github.orangegangsters.lollipin.lib.interfaces.LifeCycleInterface;
 
 import java.security.SecureRandom;
@@ -97,6 +98,11 @@ public class AppLockImpl<T extends AppLockActivity> extends AppLock implements L
      */
     private static AppLockImpl mInstance;
 
+    /**
+     * custom callback for checking and setting passcode.
+     */
+    private ILockCallback mLockCallback;
+
     /**
      * Static method that allows to get back the current static Instance of {@link AppLockImpl}
      *
@@ -262,8 +268,16 @@ public void setLastActiveMillis() {
         editor.apply();
     }
 
+    @Override
+    public void setCallback(ILockCallback lockCallback) {
+        mLockCallback = lockCallback;
+    }
+
     @Override
     public boolean checkPasscode(String passcode) {
+        if (mLockCallback != null) {
+            return mLockCallback.onCheckPasscode(passcode);
+        }
         Algorithm algorithm = Algorithm.getFromText(mSharedPreferences.getString(PASSWORD_ALGORITHM_PREFERENCE_KEY, ""));
 
         String salt = getSalt();
@@ -284,6 +298,9 @@ public boolean checkPasscode(String passcode) {
 
     @Override
     public boolean setPasscode(String passcode) {
+        if (mLockCallback != null) {
+            return mLockCallback.onSetPasscode(passcode);
+        }
         String salt = getSalt();
         SharedPreferences.Editor editor = mSharedPreferences.edit();