java - 我们可以在android中对音频文件使用加密/解密吗

Question

我已经对我想要保护的音频文件进行了加密和解密。但解密后，它显示了 MediaPlayer 的一些警告日志，并且 MediaPlayer 也无法工作。

所以我只是想知道加密/解密过程是否损坏了我的音频文件？

这里提到了日志:

11-14 13:41:42.136: W/System.err(17602): java.io.IOException: Prepare failed.: status=0xFFFFFFFC
11-14 13:41:42.136: W/System.err(17602):    at android.media.MediaPlayer.prepare(Native Method)
11-14 13:41:42.136: W/System.err(17602):    at com.zenagestudios.itaaleemlehra.LessonPlayActivity.startPlayer(LessonPlayActivity.java:293)
11-14 13:41:42.136: W/System.err(17602):    at com.zenagestudios.itaaleemlehra.LessonPlayActivity.onClick(LessonPlayActivity.java:446)
11-14 13:41:42.136: W/System.err(17602):    at android.view.View.performClick(View.java:2461)
11-14 13:41:42.136: W/System.err(17602):    at android.view.View$PerformClick.run(View.java:8890)
11-14 13:41:42.136: W/System.err(17602):    at android.os.Handler.handleCallback(Handler.java:587)
11-14 13:41:42.136: W/System.err(17602):    at android.os.Handler.dispatchMessage(Handler.java:92)
11-14 13:41:42.136: W/System.err(17602):    at android.os.Looper.loop(Looper.java:123)
11-14 13:41:42.136: W/System.err(17602):    at android.app.ActivityThread.main(ActivityThread.java:4632)
11-14 13:41:42.136: W/System.err(17602):    at java.lang.reflect.Method.invokeNative(Native Method)
11-14 13:41:42.136: W/System.err(17602):    at java.lang.reflect.Method.invoke(Method.java:521)
11-14 13:41:42.136: W/System.err(17602):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
11-14 13:41:42.136: W/System.err(17602):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-14 13:41:42.136: W/System.err(17602):    at dalvik.system.NativeStart.main(Native Method)

我已尝试使用相同的代码对示例 XML 文件进行加密/解密，并且该代码对于 XML 文件运行良好。

这是我用于加密/解密的代码:

 public void encrypt(InputStream in, OutputStream out){
    try {
        // Bytes written to out will be encrypted
        out = new CipherOutputStream(out, ecipher);

        // Read in the cleartext bytes and write to out to encrypt
        int numRead = 0;
        while ((numRead = in.read(buf)) >= 0){
            out.write(buf, 0, numRead);
        }
        System.out.println("Database Encrypted");
        out.close();
    }
    catch (java.io.IOException e){
        e.printStackTrace();
    }
}


 public void decrypt(InputStream in, OutputStream out){

    try {
        //staticdata. dialog = ProgressDialog.show(mContext, "","Loading. Please wait...", false);
        // Bytes read from in will be decrypted
        in = new CipherInputStream(in, dcipher);

        // Read in the decrypted bytes and write the cleartext to out
        int numRead = 0;
        while ((numRead = in.read(buf)) >= 0) {

            out.write(buf, 0, numRead);
        }
        System.out.println("Database Decrypted");

        out.close();
    } 
    catch (java.io.IOException e) {
         e.printStackTrace();
    }

}

Answer 1

是的，您似乎没有正确加密/解密文件。您可以在一个简单的文本文件上测试您的加密/解密，看看该文件是否完好无损。