Android 在流异常中找不到密文的匹配密钥

您好，我正在使用jetpack安全加密库对文件进行加密。我已使用以下代码生成主密钥。

  MasterKey masterKey = null;
         try {
            masterKey = new
                     MasterKey.Builder(context, MasterKey.DEFAULT_MASTER_KEY_ALIAS)
                     .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
                     .build();
         } catch (GeneralSecurityException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

   InputStream inputStream = new BufferedInputStream(appCtx.getAssets().open("Sample.txt"));
             byte[] fileBytes=new byte[inputStream.available()];
             inputStream.read(fileBytes);
             File file = new File(Environment.getExternalStorageDirectory(), "Sample.txt");
             if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
                 EncryptedFile encryptedFile = new EncryptedFile.Builder(
                         appCtx,
                         file,
                         masterKey,
                         EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB
                 ).build();
                 OutputStream outputStream = encryptedFile.openFileOutput();
                 outputStream.write(fileBytes);
                 outputStream.flush();
                 outputStream.close();

我已加密了文本文件Sample.txt，并将加密文件写入设备外部存储器。代码如下所示。

  MasterKey masterKey = null;
         try {
            masterKey = new
                     MasterKey.Builder(context, MasterKey.DEFAULT_MASTER_KEY_ALIAS)
                     .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
                     .build();
         } catch (GeneralSecurityException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

   InputStream inputStream = new BufferedInputStream(appCtx.getAssets().open("Sample.txt"));
             byte[] fileBytes=new byte[inputStream.available()];
             inputStream.read(fileBytes);
             File file = new File(Environment.getExternalStorageDirectory(), "Sample.txt");
             if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
                 EncryptedFile encryptedFile = new EncryptedFile.Builder(
                         appCtx,
                         file,
                         masterKey,
                         EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB
                 ).build();
                 OutputStream outputStream = encryptedFile.openFileOutput();
                 outputStream.write(fileBytes);
                 outputStream.flush();
                 outputStream.close();

我将加密文件放在资产文件夹中，现在尝试解密，但根据文档EncryptedFile.Builder始终将文件对象作为参数，当前我在从资产读取文件后有Inputstream因此，为了获取文件对象，我将这个Inutstream作为Temp.txt写入外部存储器，并传递这个文件进行解密。但是我得到的异常是java.io.IOException：在流中找不到与密文匹配的密钥。

  MasterKey masterKey = null;
         try {
            masterKey = new
                     MasterKey.Builder(context, MasterKey.DEFAULT_MASTER_KEY_ALIAS)
                     .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
                     .build();
         } catch (GeneralSecurityException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

   InputStream inputStream = new BufferedInputStream(appCtx.getAssets().open("Sample.txt"));
             byte[] fileBytes=new byte[inputStream.available()];
             inputStream.read(fileBytes);
             File file = new File(Environment.getExternalStorageDirectory(), "Sample.txt");
             if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
                 EncryptedFile encryptedFile = new EncryptedFile.Builder(
                         appCtx,
                         file,
                         masterKey,
                         EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB
                 ).build();
                 OutputStream outputStream = encryptedFile.openFileOutput();
                 outputStream.write(fileBytes);
                 outputStream.flush();
                 outputStream.close();

解密代码如下所示：

   InputStream myInputstream = new BufferedInputStream(appCtx.getAssets().open("Sample.txt"));
             File enfile = createFileFromInputStream(myInputstream,appCtx);
             if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
                 EncryptedFile encryptedFile = new EncryptedFile.Builder(
                         appCtx,
                         enfile,
                         masterKey,
                         EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB
                 ).build();
                 InputStream inputStream1 = encryptedFile.openFileInput();
       BufferedOutputStream os1 = new BufferedOutputStream( new FileOutputStream(new File(dstPath)));
                 int length = 0;
                 byte[] buffer = new  byte[1024];
                 while ((length = inputStream1.read(buffer)) != -1) {
                     os1.write(buffer, 0, length);
                 }
                 os1.close();
             }

     private static File createFileFromInputStream(InputStream stream, Context context) {
             File f = new File(Environment.getExternalStorageDirectory(), "Temp.txt");
             BufferedOutputStream os1 = null;
             try {
                 os1 = new BufferedOutputStream( new FileOutputStream(f));
                 int length = 0;
                 byte[] buffer = new  byte[1024];
                 while ((length = stream.read(buffer)) != -1) {
                     os1.write(buffer, 0, length);
                 }
                 os1.close();
                 stream.close();
                 return f;
         } catch (FileNotFoundException e) {
                 e.printStackTrace();
             }catch (IOException e) {
                 //Logging exception
             }
 
         return null;
     }

主要场景： 若将加密文件写入外部存储器，并直接从外部存储器读取以进行解密，那个么所有文件都正常工作。但是，如果我将加密文件粘贴到资产文件夹中，并将从资产文件夹获取的Inputstream写入某个临时文件，然后尝试对其进行解密，则会出现错误java.io.IOException:在流中找不到与密文匹配的密钥。

  MasterKey masterKey = null;
         try {
            masterKey = new
                     MasterKey.Builder(context, MasterKey.DEFAULT_MASTER_KEY_ALIAS)
                     .setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
                     .build();
         } catch (GeneralSecurityException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }

   InputStream inputStream = new BufferedInputStream(appCtx.getAssets().open("Sample.txt"));
             byte[] fileBytes=new byte[inputStream.available()];
             inputStream.read(fileBytes);
             File file = new File(Environment.getExternalStorageDirectory(), "Sample.txt");
             if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
                 EncryptedFile encryptedFile = new EncryptedFile.Builder(
                         appCtx,
                         file,
                         masterKey,
                         EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB
                 ).build();
                 OutputStream outputStream = encryptedFile.openFileOutput();
                 outputStream.write(fileBytes);
                 outputStream.flush();
                 outputStream.close();

请任何人帮我解决这个问题。

---

谢谢

这是android加密库的内部实现问题。尝试更新到最新版本，这对我很有帮助。

具体来说，版本

1.1.0-alpha02

解决了我的问题。