[英]Android - Storing private keys in keystore
如何將我的私鑰(密碼,用戶名,Sha1)存儲在Keystore中,以確保其安全性? 我嘗試下面的代碼,但沒有運氣。
private Context ctx;
public MainActivity(Context ctx) {
this.ctx = ctx;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
genKey();
} catch (Exception e) {
e.printStackTrace();
Log.d("warning", "m in catch");
}
}
public void genKey() throws Exception {
SecretKey key = KeyGenerator.getInstance("AES").generateKey();
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(null, "clavedekey".toCharArray());
PasswordProtection pass = new PasswordProtection(
"fedsgjk".toCharArray());
KeyStore.SecretKeyEntry skEntry = new KeyStore.SecretKeyEntry(key);
ks.setEntry("secretKeyAlias", skEntry, pass);
FileOutputStream fos = ctx.openFileOutput("bs.keystore",
Context.MODE_PRIVATE);
ks.store(fos, "clavedekey".toCharArray());
fos.close();
}
這是我得到的日志錯誤。
06-13 14:04:11.829: E/AndroidRuntime(6248): FATAL EXCEPTION: main
06-13 14:04:11.829: E/AndroidRuntime(6248): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.demo_keystore/com.demo_keystore.MainActivity}: java.lang.InstantiationException: can't instantiate class com.demo_keystore.MainActivity; no empty constructor
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2045)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.ActivityThread.access$700(ActivityThread.java:140)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.os.Handler.dispatchMessage(Handler.java:99)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.os.Looper.loop(Looper.java:177)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.ActivityThread.main(ActivityThread.java:4947)
06-13 14:04:11.829: E/AndroidRuntime(6248): at java.lang.reflect.Method.invokeNative(Native Method)
06-13 14:04:11.829: E/AndroidRuntime(6248): at java.lang.reflect.Method.invoke(Method.java:511)
06-13 14:04:11.829: E/AndroidRuntime(6248): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
06-13 14:04:11.829: E/AndroidRuntime(6248): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
06-13 14:04:11.829: E/AndroidRuntime(6248): at dalvik.system.NativeStart.main(Native Method)
06-13 14:04:11.829: E/AndroidRuntime(6248): Caused by: java.lang.InstantiationException: can't instantiate class com.demo_keystore.MainActivity; no empty constructor
06-13 14:04:11.829: E/AndroidRuntime(6248): at java.lang.Class.newInstanceImpl(Native Method)
06-13 14:04:11.829: E/AndroidRuntime(6248): at java.lang.Class.newInstance(Class.java:1319)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
06-13 14:04:11.829: E/AndroidRuntime(6248): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2036)
06-13 14:04:11.829: E/AndroidRuntime(6248): ... 11 more
異常跟蹤中詳細介紹了您面臨的問題:
Caused by: java.lang.InstantiationException: can't instantiate class
com.demo_keystore.MainActivity; no empty constructor
簡單地說,您不能這樣做:
public MainActivity(Context ctx) {
this.ctx = ctx;
}
您無需將Context
傳遞給Activity
,它已經具有一個Activity
(調用getContext()
或僅使用this
)。 Android在Java中通常具有構造函數,而Android在Activities
, Services
等方面繞過了這種需求,而偏向於Activity的生命周期 。
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