目录
- 需求和背景
- 实现
- 安全管理类
- 相关工具类
需求和背景
行业相关,对安全性较高的程序一般都需要添加完整性检测的功能,以防止程序被篡改,从而导致安全问题的发生。
相关的支付应用项目今年也做了好几个,这些程序也都已通过了行业相关安全标准的认证。实现
下面来分享android APP完整性校验的实现思路和代码实现。
通过sp判断当前是否是第一次安装apk,第一次安装默认apk是从市场下载安装,默认认为是没有被篡改过的。可以不用检查,只计算当前的hash值并保存到文件中。
可以在application中执行,计算apk的hash值并写文件的操作是耗时操作,记得开子线程进行。
private boolean integrityCheckResult = falhttp://www.devze.comse; private boolean isFirstRun;//可以通过文件保存,例如SP @Override public void onCreate() { super.onCreate(); ThreadPoolManager.getInstance().runInBackground(new Runnable() { @Override public void run() { //检测apk完整性 if (isFirstRun){//skip and calculate apk's hahttp://www.devze.comsh SecurityManager.getInstance().checkIntegrity(true); integrityCheckResult = true; }else { integrityCheckResult = SecurityManager.getInstance().checkIntegrity(false); } } }); public boolean isIntegrityCheckResult() { return integrityCheckResult; }
在入口activity中判断是否完整性校验通过,假如不通过,可以弹窗提示然后锁定APP,让用户重新在安全的平台重新下载安装。当前APP无法使用,存在安全问题。
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (App.getApp().isIntegrityCheckResult()) { Log.d(TAG, "onCreate: checkIntegrity success"); } else { Log.d(TAG, "onCreate: checkIntegrity failed"); } }
安全管理类
新建一个安全管理类,用于管理所有和安全相关的类
public class SecurityManager { //做一个单例 private static SecurityManager instance = null; private final Integrity integrity; private SecurityManager(){ integrity = new Integrity(); } public static synchronized SecurityManager getInstance() { if (instance == null) instance = new SecurityManager(); return instance; } public boolean checkIntegrity(boolean isFirstInstall) { return integrity.checkIntegrity(isFirstInstall); } }
实现完整性检测类的接口
public interface IIntegrity { boolean checkApkIntegrity(); }
完整性检测实现类:
public class Integrity implements IIntegrity { public boolean checkIntegrity(boolean isFirstInstall) { if (isFirstInstall) { calcAndSaveApkSoHash(); return true; } else { return compareHashsWithLastTime(); } } private void calcAndSaveApkSoHash() { File apk = new File(BaseApplication.getAppContext().getPackageCodePath()); byte[] apkHash = HashCalculator.calculateHashBytes(apk, HashCalculator.SHA_256); FileUtils.writeBytesToFile(filePath + APK_HASH_FILE, apkHash); } private boolean compareHashsWithLastTime() { //检测apk so return checkApkIntegrity(); } @Override public boolean checkApkIntegrity() { if (BuildConfig.DEBUG) { Log.w(TAG, "Debug version,skip apk‘s hash verification"); return true; } try { String apkPath = BaseApplication.getAppContext().getPackageCodePath(); byte[] originalApkHash = FileUtils.readFileToBytes(filePath + APK_HASH_FILE); return calcSrcAndCompareWithLastHash(originalApkHash, new File(apkPath)); } catch (IOException e) { Log.e(TAG, "checkApkAndLibs: ", e); } return false; } /** * 计算明文数据并和上一次hash进行比较 * * @param decHashBytes 明文hash数据 * @param decSrc 明文源数据 */ private static b编程客栈oolean calcSrcAndCompareWithLastHash(byte[] decHashBytes, File decSrc) { String decHash = Utils.bcd2Str(decHashBytes); //计算解密ksn的hash String calcHash = HashCalculator.calculateHash(decSrc, HashCalculator.SHA_256); LogUtils.i(TAG, "calculate hash = " + Utpythonils.bcd2Str( HashCalculator.calculateHashBytes(decSrc, HashCalculator.SHA_256))); return decHash.equalsIgnoreCase(calcHash); } }
相关工具类
这个只是工具类,方便获取Application ,只要获取context即可,可以随意发挥。
public class BaseApplication extends Application { private static BaseApplication mBaseApplication ; mBaseApplication = this; } public static BaseApplication getAppContext(){ return mBaseApplication; }
编码转换工具:
@NonNull public static String bcd2Str(@Nullable byte[] b, int length) { if (b == null) { return ""; } StringBuilder sb = new StringBuilder(length * 2); for (int i = 0; i < length; ++i) { sb.append(ARRAY_OF_CHAR[((b[i] & 0xF0) >>> 4)]); sb.append(ARRAY_OF_CHAR[(b[i] & 0xF)]); } return sb.toString(); }
hash计算器
@NonNull public static String bcd2Str(@Nullable byte[] b, int length) { if (b == null) { return ""; } StringBuilder sb = new StringBuilder(length * 2); for (int i = 0; i < length; ++i) { sb.append(ARRAY_OF_CHAR[((b[i] & 0xF0) >>> 4)]); sb.append(ARRAY_OF_CHAR[(b[i] & 0xF)]); } return sb.toString(); }
文件工具类
/** * 文件锁定(File Locking) * 强制刷新缓冲(Force Flushing Buffer): */ public static boolean writeBytesToFile(String filePath, byte[] bytes) { try (FileOutputStream fos = new FileOutputStream(filePath)) { fos.write(bytes); // 获取文件锁定 FileChannel fileChannel = fos.ge编程客栈tChannel(); try (FileLock fileLock = fileChannel.lock()) { // 强制刷新缓冲 fileChannel.force(true); } return true; } catch (IOException e) { LogUtils.e(e); return false; } }
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