我正在尝试使用Base64对我的sharedPreferences用户名和密码进行编码,但是当在eclipse模拟器中运行我的程序时,我收到并显示错误消息“Array out of bounds”。我不确定这个错误意味着什么,以及如何纠正它。
logcat的:
10-06 13:51:24.005: E/AndroidRuntime(4272): FATAL EXCEPTION: main
10-06 13:51:24.005: E/AndroidRuntime(4272): java.lang.ArrayIndexOutOfBoundsException: length=3; index=3
10-06 13:51:24.005: E/AndroidRuntime(4272): at com.SharedPreferences.Login.SharedPrefLoginActivity.onClick(SharedPrefLoginActivity.java:84)
10-06 13:51:24.005: E/AndroidRuntime(4272): at android.view.View.performClick(View.java:3511)
10-06 13:51:24.005: E/AndroidRuntime(4272): at android.view.View$PerformClick.run(View.java:14105)
10-06 13:51:24.005: E/AndroidRuntime(4272): at android.os.Handler.handleCallback(Handler.java:605)
10-06 13:51:24.005: E/AndroidRuntime(4272): at android.os.Handler.dispatchMessage(Handler.java:92)
10-06 13:51:24.005: E/AndroidRuntime(4272): at android.os.Looper.loop(Looper.java:137)
10-06 13:51:24.005: E/AndroidRuntime(4272): at android.app.ActivityThread.main(ActivityThread.java:4424)
10-06 13:51:24.005: E/AndroidRuntime(4272): at java.lang.reflect.Method.invokeNative(Native Method)
10-06 13:51:24.005: E/AndroidRuntime(4272): at java.lang.reflect.Method.invoke(Method.java:511)
10-06 13:51:24.005: E/AndroidRuntime(4272): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
10-06 13:51:24.005: E/AndroidRuntime(4272): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
10-06 13:51:24.005: E/AndroidRuntime(4272): at dalvik.system.NativeStart.main(Native Method)
这是我的注册活动,应该使用EditText字符串,编码并保存到sharedpreferences xml。
public void onClick(View arg0) {
user=rName.getText().toString().trim();
pass=rPwd.getText().toString().trim();
if(arg0==regBttn){
if((user.length()!=0))
{
if((pass.length()!=0))
{
sp=getSharedPreferences("AccessApp",MODE_WORLD_WRITEABLE);
Editor myEditor=sp.edit();
try {
myEditor.putString("USERNAME_KEY", user);
byte[ ] superSecretKeyBytes = Base64.decode(user);
byte[] key = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6 };
for (int i = 0; i < pass.length(); i++) {
key[i] = superSecretKeyBytes[i];
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
myEditor.putString("PASSWORD_KEY", pass);
byte[ ] superSecretKeyBytes = Base64.decode(pass);
byte[] key = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6 };
for (int i = 0; i < pass.length(); i++) {
key[i] = superSecretKeyBytes[i];
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
myEditor.commit();
Toast.makeText(this, "Registration is successfull",10000).show();
i=new Intent(this,AccessApp.class);
startActivity(i);
}
else
{
Toast.makeText(this, "Please Enter password", 10000).show();
}
}
else{
Toast.makeText(this,"Please Enter Username",10000).show();
}
}
else if(arg0==rtnBttn){
AlertDialog.Builder builder=new AlertDialog.Builder(this);
builder.setTitle("Exit");
builder.setMessage("Do you want to exit");
builder.setCancelable(false);
builder.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
finish();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
arg0.cancel();
}
});
AlertDialog alert=builder.create();
alert.show();
}
}
public String encrypt(String toencrypt, byte key[]) throws Exception {
SecretKeySpec secret = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secret);
byte[] encryptedbytes = cipher.doFinal(toencrypt.getBytes());
String encrypted = Base64.encodeBytes(encryptedbytes);
return encrypted;
}
}
更正:
The below corrections were applied.
(int i = 0; i < superSecretKeyBytes.length && i < key.length; i++)
Issue:
Array error has cleared but EditText string is still saved in clear text.?
答案 0 :(得分:0)
解码USERNAME_KEY时,看起来你正在引用pass.length而不是user.length作为for循环中的停止条件,即第一个实例:
for (int i = 0; i < pass.length(); i++) {
应该是:
for (int i = 0; i < user.length(); i++) {
答案 1 :(得分:0)
pass.length()(实际上是pass.length() - 1,技术上来说)大于key []和superSecretKeyBytes []数组中分配的位置/位置。因此,您最终会尝试访问不存在的数组中的位置,从而生成Out of Bounds错误。
答案 2 :(得分:0)
为什么在周期内没有使用pass
长度的循环条件?你确定superSecretKeyBytes.length == pass.length()
? (可能不等于,你是从Base64解码)
写这个更安全:
for (int i = 0; i < superSecretKeyBytes.length; i++) {
key[i] = superSecretKeyBytes[i];
}
而不是:
for (int i = 0; i < pass.length(); i++) {
key[i] = superSecretKeyBytes[i];
}
此外,对于OutOfBoundsException
数组,您不会获得key
的任何保证?也希望在周期中检查这个:
for (int i = 0; i < superSecretKeyBytes.length && i < key.length; i++) {
key[i] = superSecretKeyBytes[i];
}
答案 3 :(得分:0)
我认为你已经离开了关键阵列。你应该检查:
pass.length() <= key.length
希望这有帮助