设置-安全-手机加密功能讲解加密手机「设置-安全-手机加密功能讲解」

设置-安全-手机加密功能讲解加密手机「设置-安全-手机加密功能讲解」

2025-04-02 12:36 浏览:80

一、加密的几种状态

http://osxr.org/android/source/frameworks/base/core/java/android/app/admin/DevicePolicyManager.java#1142

1117 * Result code for {@link #setStorageEncryption} and {@link #getStorageEncryptionStatus}:
1118 * indicating that encryption is not supported.
1119 */
1120 public static final int ENCRYPTION_STATUS_UNSUPPORTED = 0;
1121
1122
1126 public static final int ENCRYPTION_STATUS_INACTIVE = 1;
1127
1128
1136 public static final int ENCRYPTION_STATUS_ACTIVATING = 2;
1137
1138
1142 public static final int ENCRYPTION_STATUS_ACTIVE = 3;

二、service的调用

http://osxr.org/android/source/frameworks/base/services/java/com/android/server/DevicePolicyManagerService.java#2029

2023
2029 private int getEncryptionStatus() {
2030 String status = SystemProperties.get("ro.crypto.state", "unsupported");
2031 if ("encrypted".equalsIgnoreCase(status)) {
2032 return DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE;
2033 } else if ("unencrypted".equalsIgnoreCase(status)) {
2034 return DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE;
2035 } else {
2036 return DevicePolicyManager.ENCRYPTION_STATUS_UNSUPPORTED;
2037 }
2038 }
2039

三、最后调用

http://osxr.org/android/source/frameworks/base/services/java/com/android/server/DevicePolicyManagerService.java#2029
2005
2008 public int getStorageEncryptionStatus() {
2009 return getEncryptionStatus();

2010 }

四、settings的使用（一）

http://osxr.org/android/source/packages/apps/Settings/src/com/android/settings/SecuritySettings.java#0145

0140 // Add options for device encryption
0141 DevicePolicyManager dpm =
0142 (DevicePolicyManager) getSystemService(Context.DEVICE_POLICY_SERVICE);
0143
0144 if (UserId.myUserId() == 0) {
0145 switch (dpm.getStorageEncryptionStatus()) {
0146 case DevicePolicyManager.ENCRYPTION_STATUS_ACTIVE:
0147 // The device is currently encrypted.
0148 addPreferencesFromResource(R.xml.security_settings_encrypted);
0149 break;
0150 case DevicePolicyManager.ENCRYPTION_STATUS_INACTIVE:
0151 // This device supports encryption but isn't encrypted.
0152 addPreferencesFromResource(R.xml.security_settings_unencrypted);
0153 break;
0154 }
0155 }

四、setting的使用（二）

0017 package com.android.settings;
0018
0019 import android.app.Activity;
0020 import android.app.Fragment;
0021 import android.app.StatusBarManager;
0022 import android.content.Context;
0023 import android.content.Intent;
0024 import android.os.Bundle;
0025 import android.os.Handler;
0026 import android.os.IBinder;
0027 import android.os.ServiceManager;
0028 import android.os.storage.IMountService;
0029 import android.util.Log;
0030 import android.view.LayoutInflater;
0031 import android.view.View;
0032 import android.view.ViewGroup;
0033 import android.widget.Button;
0034
0035 public class CryptKeeperConfirm extends Fragment {
0036
0037 public static class Blank extends Activity {
0038 private Handler mHandler = new Handler();
0039
0040 @Override
0041 public void onCreate(Bundle savedInstanceState) {
0042 super.onCreate(savedInstanceState);
0043
0044 setContentView(R.layout.crypt_keeper_blank);
0045
0046 if (Utils.isMonkeyRunning()) {
0047 finish();
0048 }
0049
0050 StatusBarManager sbm = (StatusBarManager) getSystemService(Context.STATUS_BAR_SERVICE);
0051 sbm.disable(StatusBarManager.DISABLE_EXPAND
0052 | StatusBarManager.DISABLE_NOTIFICATION_ICONS
0053 | StatusBarManager.DISABLE_NOTIFICATION_alertS
0054 | StatusBarManager.DISABLE_SYSTEM_INFO
0055 | StatusBarManager.DISABLE_HOME
0056 | StatusBarManager.DISABLE_RECENT
0057 | StatusBarManager.DISABLE_BACK);
0058
0059 // Post a delayed message in 700 milliseconds to enable encryption.
0060 // NOTE: The animation on this activity is set for 500 milliseconds
0061 // I am giving it a little extra time to complete.
0062 mHandler.postDelayed(new Runnable() {
0063 public void run() {
0064 IBinder service = ServiceManager.getService("mount");
0065 if (service == null) {
0066 Log.e("CryptKeeper", "Failed to find the mount service");
0067 finish();
0068 return;
0069 }
0070
0071 IMountService mountService = IMountService.Stub.asInterface(service);
0072 try {
0073 Bundle args = getIntent().getExtras();
0074 mountService.encryptStorage(args.getString("password"));
0075 } catch (Exception e) {
0076 Log.e("CryptKeeper", "Error while encrypting...", e);
0077 }
0078 }
0079 }, 700);
0080 }
0081 }
0082
0083 private View mContentView;
0084 private Button mFinalButton;
0085 private Button.onClickListener mFinalClickListener = new Button.onClickListener() {
0086
0087 public void onClick(View v) {
0088 if (Utils.isMonkeyRunning()) {
0089 return;
0090 }
0091
0092 Intent intent = new Intent(getActivity(), Blank.class);
0093 intent.putExtras(getArguments());
0094
0095 startActivity(intent);
0096 }
0097 };
0098
0099 private void establishFinalConfirmationState() {
0100 mFinalButton = (Button) mContentView.findViewById(R.id.execute_encrypt);
0101 mFinalButton.setonClickListener(mFinalClickListener);
0102 }
0103
0104 @Override
0105 public View onCreateView(LayoutInflater inflater, ViewGroup container,
0106 Bundle savedInstanceState) {
0107 mContentView = inflater.inflate(R.layout.crypt_keeper_/confirm/i, null);
0108 establishFinalConfirmationState();
0109 return mContentView;
0110 }
0111 }

<string name="crypt_keeper_desc" product="tablet" msgid="3839235202103924154">"您可以加密自己的帐户、设置、已下载的应用及其数据、媒体和其他文件。加密平板电脑后，您每次开机时都需要输入数字 PIN 或密码才能解密。取消加密的唯一方法就是恢复出厂设置，但这会清除平板电脑上的所有数据。" "加密过程需要 1 小时或更长时间。在开始加密前，电池必须有电，并且在加密完成前必须一直连接电源。如果您中断加密过程，则会丢失部分或全部数据。"</string>

<string name="crypt_keeper_button_text" product="default" msgid="2008346408473255519">"加密手机"</string>

五、encryptStorage的来源

http://osxr.org/android/source/frameworks/base/core/java/android/os/storage/IMountService.java#0628

public int encryptStorage(String password) throws RemoteException {
0629 Parcel _data = Parcel.obtain();
0630 Parcel _reply = Parcel.obtain();
0631 int _result;
0632 try {
0633 _data.writeInterfaceToken(DEscriptOR);
0634 _data.writeString(password);
0635 mRemote.transact(Stub.TRANSACTION_encryptStorage, _data, _reply, 0);
0636 _reply.readException();
0637 _result = _reply.readInt();
0638 } finally {
0639 _reply.recycle();
0640 _data.recycle();
0641 }
0642 return _result;
0643 }
0644

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