NaserKhoshfetrat

import android.content.Intent
import android.text.Html
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

class ShareUtils constructor(val activity: AppCompatActivity) {
    companion object : SingletonHolder<ShareUtils, AppCompatActivity>(::ShareUtils)

    fun shareHtmlMessage(shareSubject: String?, shareBodyHtml: String?) {

NaserKhoshfetrat

open class SingletonHolder<out T, in A>(private val constructor: (A) -> T) {

    @Volatile
    private var instance: T? = null

    fun getInstance(arg: A): T {
        return when {
            instance != null -> instance!!
            else -> synchronized(this) {
                if (instance == null) instance = constructor(arg)

NaserKhoshfetrat

import android.content.Context;
import android.content.SharedPreferences;

public class SharedPreferencesUtils {
    private final SharedPreferences preferences;

    public SharedPreferencesUtils(SharedPreferences preferences) {
        this.preferences = preferences;
    }

NaserKhoshfetrat

import android.content.Context;
import android.content.SharedPreferences;
import android.security.keystore.KeyGenParameterSpec;
import android.security.keystore.KeyProperties;

import androidx.security.crypto.EncryptedSharedPreferences;
import androidx.security.crypto.MasterKey;

import com.package.package.BuildConfig;

NaserKhoshfetrat

public class EncryptorAesGcmPasswordFile{
   public static byte[] encrypt(byte[] pText, String password) throws Exception {

        //...

        // prefix IV and Salt to cipher text
        byte[] cipherTextWithIvSalt = ByteBuffer.allocate(iv.length + salt.length + cipherText.length)
                .put(iv)
                .put(salt)
                .put(cipherText)

NaserKhoshfetrat

package com.mkyong.crypto.utils;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

NaserKhoshfetrat

package com.mkyong.crypto.encryptor;

import com.mkyong.crypto.utils.CryptoUtils;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;

NaserKhoshfetrat

package com.mkyong.crypto.encryptor;

import com.mkyong.crypto.utils.CryptoUtils;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

NaserKhoshfetrat

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import java.util.Base64;

/**
 * Possible KEY_SIZE values are 128, 192 and 256
 * Possible T_LEN values are 128, 120, 112, 104 and 96
 */

NaserKhoshfetrat

import javax.crypto.Cipher;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Base64;

/**
 * @author Anass AIT BEN EL ARBI
 * <ul>