介绍

封装了SharePreference插入AES加密后的数据的功能，减少了明文存储造成用户信息泄露的风险

使用方式

• Applicaton初始化

 public class MyApplication extends Application {private static Context appContext;@Overridepublic void onCreate() {super.onCreate();setAppContext(getApplicationContext());//初始化AES工具类，并设置AES密码AESUtils.init("ASDFSDokju98kSsdfDF");//默认SharePreference使用USERINFO标签数据 切换到其他文件通过 setTag()方法SharePreferencesUtils.init("USERINFO");}public static Context getAppContext() {if (appContext == null)appContext = getAppContext();return appContext;}public static void setAppContext(Context appContext) {MyApplication.appContext = appContext;}
}

• 写入加密数据到SharePreference

SharePreferencesUtils.setTag("USERINFO");SharePreferencesUtils.putString("username", "迪丽热巴");SharePreferencesUtils.putString("password", "abc123");SharePreferencesUtils.putString("phone", "18567345345");

• 读取SharePreference的加密数据

 SharePreferencesUtils.getString("username")；SharePreferencesUtils.getString("password")；SharePreferencesUtils.getString("phone");

两个工具类如下

AESUtils类

package com.hujing.kabao.utils;import android.support.annotation.NonNull;import java.io.UnsupportedEncodingException;import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;public class AESUtils {private static String aes_key;private AESUtils() {}/*** 静态内部类实现单例模式*/private static class AESUtilsHelp {private static final AESUtils instance = new AESUtils();}public static AESUtils init(@NonNull String key) {aes_key = key;return AESUtilsHelp.instance;}//    private static final String CipherMode = "AES/ECB/PKCS5Padding";使用ECB加密，不需要设置IV，但是不安全private static final String CipherMode = "AES/CFB/NoPadding";//使用CFB加密，需要设置IV// /** 创建密钥 **/private static SecretKeySpec createKey(String password) {byte[] data = null;if (password == null) {password = "";}StringBuilder sb = new StringBuilder(32);sb.append(password);while (sb.length() < 32) {sb.append("0");}if (sb.length() > 32) {sb.setLength(32);}try {data = sb.toString().getBytes("UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return new SecretKeySpec(data, "AES");}// /** 加密字节数据 **/private static byte[] encrypt(byte[] content, String password) {try {SecretKeySpec key = createKey(password);System.out.println(key);Cipher cipher = Cipher.getInstance(CipherMode);cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(new byte[cipher.getBlockSize()]));return cipher.doFinal(content);} catch (Exception e) {e.printStackTrace();}return null;}// /** 加密(结果为16进制字符串) **/public static String encrypt(String content) {String password = aes_key;byte[] data = null;try {data = content.getBytes("UTF-8");} catch (Exception e) {e.printStackTrace();}data = encrypt(data, password);String result = byte2hex(data);return result;}// /** 解密字节数组 **/private static byte[] decrypt(byte[] content, String password) {try {SecretKeySpec key = createKey(password);Cipher cipher = Cipher.getInstance(CipherMode);cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(new byte[cipher.getBlockSize()]));return cipher.doFinal(content);} catch (Exception e) {e.printStackTrace();}return null;}// /** 解密16进制的字符串为字符串 **/public static String decrypt(String content) {String password = aes_key;byte[] data = null;try {data = hex2byte(content);} catch (Exception e) {e.printStackTrace();}data = decrypt(data, password);if (data == null)return null;String result = null;try {result = new String(data, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return result;}// /** 字节数组转成16进制字符串 **/private static String byte2hex(byte[] b) { // 一个字节的数，StringBuilder sb = new StringBuilder(b.length * 2);String tmp = "";for (byte aB : b) {// 整数转成十六进制表示tmp = (Integer.toHexString(aB & 0XFF));if (tmp.length() == 1) {sb.append("0");}sb.append(tmp);}return sb.toString().toUpperCase(); // 转成大写}// /** 将hex字符串转换成字节数组 **/private static byte[] hex2byte(String inputString) {if (inputString == null || inputString.length() < 2) {return new byte[0];}inputString = inputString.toLowerCase();int l = inputString.length() / 2;byte[] result = new byte[l];for (int i = 0; i < l; ++i) {String tmp = inputString.substring(2 * i, 2 * i + 2);result[i] = (byte) (Integer.parseInt(tmp, 16) & 0xFF);}return result;}
}

SharePreferencesUtils类
(只写了String的插入于读取，其他数据类型自行添加)

package com.hujing.kabao.utils;import android.annotation.SuppressLint;
import android.content.Context;
import android.content.SharedPreferences;
import android.support.annotation.NonNull;
import android.util.Log;import com.hujing.kabao.MyApplication;public class SharePreferencesUtils {private static Context context;private static SharedPreferences preferences;private static SharedPreferences.Editor editor;private SharePreferencesUtils() {}private static class SharePerferencesUtilsHelp {private static final SharePreferencesUtils instance = new SharePreferencesUtils();}@SuppressLint("CommitPrefEdits")public static SharePreferencesUtils init(@NonNull String preferenceName) {context = MyApplication.getAppContext();preferences = context.getSharedPreferences(preferenceName, Context.MODE_PRIVATE);editor = preferences.edit();return SharePerferencesUtilsHelp.instance;}@SuppressLint("CommitPrefEdits")public static void setTag(String tag) {preferences = context.getSharedPreferences(tag, Context.MODE_PRIVATE);editor = preferences.edit();}public static void putString(String key, String value) {String aesValue = AESUtils.encrypt(value);Log.i("test", "插入的AES数据：" + aesValue);editor.putString(key, aesValue);editor.commit();}public static String getString(String key) {String aesValue = preferences.getString(key, null);if (aesValue == null)return null;return AESUtils.decrypt(aesValue);}
}

水平有限，不足之处，望指正，方能进步。