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本文介紹了解密圖像時(shí)，給出 javax.crypto.BadPaddingException: pad block損壞的Android的處理方法，對(duì)大家解決問題具有一定的參考價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧！

問題描述

您好，我是 android 和圖像加密的新手.我的場(chǎng)景是這樣的，

Hi i'm new to android and Image encryption. My scenario is like this,

首先我要加密圖像文件.
那我上傳到服務(wù)器
我正在從我的應(yīng)用下載加密圖像并將其保存在 SD 卡中.
然后我在將其設(shè)置為 imageView 之前對(duì)其進(jìn)行解密

(我用過的所有需要??方法見底部..)

(See bottom for all need methods I have used..)

但我得到 javax.crypto.BadPaddingException: 解密時(shí)墊塊損壞.我讀了一些關(guān)于這個(gè)例外的文章，但都是關(guān)于文本加密的.你能幫我避免這種情況嗎?提前謝謝你

圖像加密使用 ...

private byte[] encrypt(byte[] raw, byte[] clear) throws Exception
{
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] encrypted = cipher.doFinal(clear);
    return encrypted;
}

這里我也保存了其他幾張圖片，都成功保存到了sd卡中...

Here I'm saving several other images as well, all saved in sd card successfully...

for (int i = 0; i < imageUrls.size(); i++)
                {
                    File file = new File(imageUrls.get(i));

                    String metapath = CommonUtils.getDataFromPreferences("metaPath", "");
                    Log.d("metapath", metapath);
                    String extStorageDirectory = metapath + file.getName();

                    File wallpaperDirectory = new File(extStorageDirectory);
                    if (!wallpaperDirectory.exists() || wallpaperDirectory.length() == 0)
                    {
                        new DownloadImagesTask()
                            .executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, imageUrls.get(i));
                    }
                }
                Toast toast = Toast.makeText(ScratchDetailsActivity.this, "Lottery was purchased and saved to sdcard/E-Lottery",
                    Toast.LENGTH_LONG);
                toast.setGravity(Gravity.CENTER, 0, 0);
                toast.show();

圖像解密...

這里的解密文件第一個(gè)參數(shù)是密鑰，第二個(gè)是我們從 SD 卡獲取的加密文件.

decrypt the file here first argument is key and second is encrypted file which we get from SD card.

        decrpt = simpleCrypto.decrypt(KEY, getImageFileFromSdCard());
        bmpimg2 = BitmapFactory.decodeByteArray(decrpt, 0, decrpt.length);
        Drawable d = new BitmapDrawable(getResources(), bmpimg2);
        hiddenImage.setImageDrawable(d);

下載圖像任務(wù)..

public class DownloadImagesTask extends AsyncTask<String, Void, InputStream>{
private String fileName;

@Override
protected InputStream doInBackground(String... urls)
{
    //Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
    return download_Image(urls[0]);
}

@Override
protected void onPostExecute(InputStream result)
{
    storeImage(result);

}

private InputStream download_Image(String url)
{
    InputStream is = null;
    File file = new File(url);
    fileName = file.getName();
    try
    {
        URL aURL = new URL(url);
        URLConnection conn = aURL.openConnection();
        conn.connect();
        is = conn.getInputStream();
    }
    catch (OutOfMemoryError e)
    {
        Log.e("Hub", "Error getting the image from server : " + e.getMessage().toString());
    }
    catch (IOException e)
    {
        Log.e("Hub", "Error getting the image from server : " + e.getMessage().toString());
    }

    return is;
}

public void storeImage(InputStream is)
{

    String extStorageDirectory = CommonUtils.getDataFromPreferences("metaPath", "");

    Log.d("extStorageDirectory", extStorageDirectory);
    OutputStream outStream = null;

    File wallpaperDirectory = new File(extStorageDirectory);
    if (!wallpaperDirectory.exists())
    {
        wallpaperDirectory.mkdirs();
    }
    File outputFile = new File(wallpaperDirectory, fileName);
    if (!outputFile.exists() || outputFile.length() == 0)
    {
        try
        {
            outStream = new FileOutputStream(outputFile);
        }
        catch (FileNotFoundException e1)
        {
            e1.printStackTrace();
        }

        try
        {
            int bytesRead = -1;
            byte[] buffer = new byte[4096];
            while ((bytesRead = is.read(buffer)) != -1)
            {
                outStream.write(buffer, 0, bytesRead);
            }

            outStream.close();
            is.close();
            Log.d("ScratchActivtiy", "Image Saved");

        }
        catch (FileNotFoundException e)
        {
            e.printStackTrace();

        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}}

getImageFileFromSDCard 方法

getImageFileFromSDCard method

/**
     * This method fetch encrypted file which is save in sd card and convert it in byte array after that this file will
     * be decrept.
     * 
     * @return byte array of encrypted data for decription.
     * @throws FileNotFoundException
     */

public byte[] getImageFileFromSdCard() throws FileNotFoundException
{

    byte[] inarry = null;

    try
    {
        String metapath = CommonUtils.getDataFromPreferences("metaPath", "");

        File imageFolder = new File(metapath);
        File urlFile = new File(selectedLottery.getImage());

        for (File f : imageFolder.listFiles())
        {
            if (urlFile.getName().equals(f.getName()))
                metapath = metapath + f.getName();
        }
        File imageFile = new File(metapath);
        //Convert file into array of bytes.
        FileInputStream fileInputStream = null;
        byte[] bFile = new byte[(int) imageFile.length()];
        fileInputStream = new FileInputStream(imageFile);
        fileInputStream.read(bFile);
        fileInputStream.close();
        inarry = bFile;

    }
    catch (IOException e)
    {
        Log.d("Exception", e.getMessage());
    }

    return inarry;
}

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解密圖像時(shí)，給出 javax.crypto.BadPaddingException: pa

問題描述

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