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Kevlar is a security toolkit (library) for Android apps. It is divided in 3 packages (antipiracy, rooting and integrity), each containing specific tooling and components.

Its purpose is to be an auditing tool, used to inspect the security environment on Android devices.

A security environment is the security state of a device, which can be probed with the different packages kevlar provides.

Each package focuses on a specific security environment area:

  • antipiracy detects the presence of pirate software installed on the device (user-wise security);
  • rooting detects the presence of root access, custom binaries, and abnormal OS status (system-wise security);
  • integrity detects certain types of tampering attempts your app may have been targeted with (app-wise security).

Kevlar is intended to be used any time it is deemed necessary to determine whether the device your app is running on can be regarded as secure, according to your policies and security requirements.

Jan 8, 2024

Safe to run has been developed in order to simplify development of secure android applications. In particular the goal of the project is to provide a simple, configurable way for app developers to define when an app should or should not run and a simple way of calling that check.

Jan 9, 2022

Extensions to encrypt DataStore using Tink.

⚠️ This tiny library will be maintained until an official solution for DataStore encryption will be released by Google.

Jan 5, 2022

A heuristic evasion library for Android. A KTX scoping function that prevents code from analysis.

Oct 1, 2020

A library for encryption/decryption and digitally media (photo/video) signing/verifying.

Jun 30, 2019

A small and simple library for managing trial period in your android app.

Mar 11, 2019

This is an lightweight library for save and get data secure into the Keystore which encrypted and decrypted.

Dec 26, 2018

Now make your applications more secure with Hasher. Simple and easy to use Hashing library that enables you to Hash in MD5 (Message Digest), SHA-1, SHA-256, SHA-392, and SHA-512.

Dec 14, 2018

BillingProtector is a small Android library aiming to check the device state & purchases security. Its main purpose is to block a transition if the application has been modified or patched; it can also be used to prevent applications from being executed on an unprotected/insecure environment.

Nov 4, 2018

Easy keystore manipulation.

Jun 19, 2018

A simple Android Library for performing encryption with AES.

Jun 8, 2018

Adds (non native) PGP encryption and decryption support.

Feb 2, 2018

A simple way to encrypt your secure data like passwords into a native .so library.

Jan 12, 2018

This is a lightweight library to generate a 64-bit random key and using AES Algorithm to encrypt/decrypt that random number to get a Secret Key and save it to Key Store.

This library especially supports for Realm Encryption. That means when using you don't have to care about how to get a random key, where to save that key for safe, ... this library will take it.

Dec 30, 2017

Email and password signup is a technology that has not been innovated on in decades. Signup forms are cumbersome and repetitive. When users forget their credentials and fail to sign in, you can lose customers. So, that's why here twitter digits comes in picture.

Oct 31, 2017

Reactive Auth APIs Wrapper Library for Google's Smart Lock for Passwords API.

Oct 16, 2017

Secure and efficient cryptography library for Android. (Auto fix SecureRandom bugs in API 18 and below.)


  • AES-256 encryption algorithm
  • CBC/CTR mode of operations
  • Block padding with PKCS7 (only with CBC)
  • Computationally secure random salt (of cipher block size)
  • Password stretching with PBKDF2
  • Random IV generated on each encryption (16 bytes)
  • Supports MD5, SHA1, and SHA2 hash functions
  • Generate secure keys with SecureRandom or
  • Asymmetric encryption with RSA
  • Auto handle large data by using hybrid asymmetric encryption
  • Supported RSA key sizes are 2048 bits and 4096 bits
Sep 21, 2017

The MSAL library for Android gives your app the ability to begin using the Microsoft Cloud by supporting Microsoft Azure Active Directory and Microsoft Accounts in a converged experience using industry standard OAuth2 and OpenID Connect. The library also supports Azure AD B2C.

May 22, 2017

Storing Credentials securely on a Device is a must. To make that possible we have combined the Android Keystore for generating Cryptographic keys, and storing them securely and using those keys we encrypt the credentials and save them in the SharedPreferences.

Apr 25, 2017

Encryptor4j consists of a set of wrapper and utility classes that make leveraging cryptography in your application alot easier.

It enables developers to encrypt and decrypt with little room for error, using few lines of code and supports all popular encryption algorithms such as AES, DES, RSA etc.

Apr 12, 2017

Simple wrapper library in Kotlin is designed to save secret to local shared preferences using Android default security and Android Keystore. KeystoreCompat ensures handling LockScreen and compatibility among diversity of Android versions.

Apr 10, 2017

It`s a simple java library for encryption. This library contains next encryption methods:

  • AES
  • Blowfish
  • DES
  • DESede
  • RSA
  • HMAC
  • PBE

It`s realy easy to use.

Apr 6, 2017

Passay is password policy enforcement for Java including password generators and validators helpers.

Apr 3, 2017

One tool to manage key generation, key storing and encryption on different APIs of Android.

As you may know android provided API to use keystore that is stored in system only from API 18. They introduced AndroidKeyStore provider that is responsible to manage this.

But as always there are underwater stones. Up to API 23 you are only able to create asymmetric keys using AndroidKeyStore provider. Also algorithms that you can use are limited. And what about devices below API 18 ?

This project provides API that wraps default JCA api and AndroidKeyStore API and makes it easy to create, manage and use your keys on any andorid API.

Jan 6, 2017

This is a reference guide for Android Security things.

Jan 4, 2017

AuthManager is a library which eliminates the boilerplate of Google SignIn and SmartLock integration.

Dec 14, 2016

SimpleEncryptorLibrary is a library for encryption and decryption strings in Android apps and PC/Mac Java applications.

Oct 11, 2016

Sodium is a new, easy-to-use software library for encryption, decryption, signatures, password hashing and more.

Aug 22, 2016

A simple library for supporting self-signed certificates in Android.

Aug 12, 2016

A library that lets you use the AES 256 password based encryption/decryption in the easiest manner.

Jul 12, 2016