[android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Kacee
I was wondering if there is any size limit for storing on shared
preferences. Could not find any such info on developer.android.com. Is
anyone aware of such space limit on internal storage ?

On Apr 14, 12:51 am, Streets Of Boston flyingdutc...@gmail.com
wrote:
 If your file is not huge, why not store it in your app's sandbox?
 Take a look at these methods of Context: getDir(...) and getCacheDir(...)

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[android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Kacee
To answer original question of HitendraSinh -
Here is one very simple encryption algo:

http://www.ecestudents.ul.ie/Course_Pages/Btech_ITT/Modules/ET4263/More%20Samples/CEncrypt.java.html

Simpler than you can imagine :)


On Apr 14, 11:07 am, Kacee komal...@gmail.com wrote:
 I was wondering if there is any size limit for storing on shared
 preferences. Could not find any such info on developer.android.com. Is
 anyone aware of such space limit on internal storage ?

 On Apr 14, 12:51 am, Streets Of Boston flyingdutc...@gmail.com
 wrote:

  If your file is not huge, why not store it in your app's sandbox?
  Take a look at these methods of Context: getDir(...) and getCacheDir(...)

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Nikolay Elenkov
On Thu, Apr 14, 2011 at 3:07 PM, Kacee komal...@gmail.com wrote:
 I was wondering if there is any size limit for storing on shared
 preferences. Could not find any such info on developer.android.com. Is
 anyone aware of such space limit on internal storage ?


Interesting question. Since each app is a different user, you'd have to use
quotas to do this. I haven't checked, but I doubt Android's kernel has support
 for this. So unless the frameworks is imposing some restrictions (does it?),
your xml files can grow until there is internal storage left. Depending on how
parsing is done, though, you might run into memory problems with big
preferences files. You'd better use separate files and/or a database if you
need to store a lot of data.

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[android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Kacee
Yes to avoid memory issues later with preferences, we are storing temp
files(in MB) on sdcard which then crops up problems of encryption/
file permissions/ etc.
Aah... we can not expect desktop facilities from a device :)

On Apr 14, 11:25 am, Nikolay Elenkov nikolay.elen...@gmail.com
wrote:
 On Thu, Apr 14, 2011 at 3:07 PM, Kacee komal...@gmail.com wrote:
  I was wondering if there is any size limit for storing on shared
  preferences. Could not find any such info on developer.android.com. Is
  anyone aware of such space limit on internal storage ?

 Interesting question. Since each app is a different user, you'd have to use
 quotas to do this. I haven't checked, but I doubt Android's kernel has support
  for this. So unless the frameworks is imposing some restrictions (does it?),
 your xml files can grow until there is internal storage left. Depending on how
 parsing is done, though, you might run into memory problems with big
 preferences files. You'd better use separate files and/or a database if you
 need to store a lot of data.

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[android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Kacee
Thanks Dianne... I think I have not put it in write way.
In my particular case,
SharedPreferences, Database are not applicable due to large file(.xml,
html,etc) size

My temp files may consume 1MB to say 10MB space. However, app deletes
them as soon as they r not needed. Since temp filesize is little more,
i am not sure if its a good option to store on device internal
Storage. Hence one option left is SDCARD, but there to protect data,
encryption needs to be applied...which probably i'll be doing now.



On Apr 14, 12:40 pm, Dianne Hackborn hack...@android.com wrote:
 You are mixing up all kinds of things.

 Each application has a directory on internal storage where its *private*
 data goes.  This is shared with all apps on internal storage; there is no
 per-app quota, though if the overall storage starts getting low a
 notification will displayed to the user which takes them to a list of apps
 sorted by how much storage each one is taking, for them to deal with the
 culprits.

 SharedPreferences is *one* way to put data in your private internal storage
 area.  It is in no way shape or form intended for large amounts of data.  It
 is for small settings data.

 Databases are another way to put data in your private internal storage.
  This also is not intended for big blobs of binary data, but works well for
 large amounts (megabytes) of structured data.

 Or you can just put whatever files you want in your internal storage, in
 whatever format you want.

 The sd card / external storage is generally for *shared* data that does not
 need to be protected from other apps.  That said, you *can* protect it
 basically as well as you can protect your private data if you do some work
 -- for example generate a random key that you put in your internal storage
 (so other apps can't get to it) which you use to encrypt the data on
 external / sd card storage.  This is basically how apps on SD card works --
 the system generates a random key for created encrypted filesystems on the
 SD card in which it installs an application.



 On Thu, Apr 14, 2011 at 12:17 AM, Kacee komal...@gmail.com wrote:
  Yes to avoid memory issues later with preferences, we are storing temp
  files(in MB) on sdcard which then crops up problems of encryption/
  file permissions/ etc.
  Aah... we can not expect desktop facilities from a device :)

  On Apr 14, 11:25 am, Nikolay Elenkov nikolay.elen...@gmail.com
  wrote:
   On Thu, Apr 14, 2011 at 3:07 PM, Kacee komal...@gmail.com wrote:
I was wondering if there is any size limit for storing on shared
preferences. Could not find any such info on developer.android.com. Is
anyone aware of such space limit on internal storage ?

   Interesting question. Since each app is a different user, you'd have to
  use
   quotas to do this. I haven't checked, but I doubt Android's kernel has
  support
    for this. So unless the frameworks is imposing some restrictions (does
  it?),
   your xml files can grow until there is internal storage left. Depending
  on how
   parsing is done, though, you might run into memory problems with big
   preferences files. You'd better use separate files and/or a database if
  you
   need to store a lot of data.

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 --
 Dianne Hackborn
 Android framework engineer
 hack...@android.com

 Note: please don't send private questions to me, as I don't have time to
 provide private support, and so won't reply to such e-mails.  All such
 questions should be posted on public forums, where I and others can see and
 answer them.

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Brill Pappin
Dianne,

It's my understanding that even if your app is installed on the SD card with 
preferExternal, the database is still stored in the private space on 
internal memory.

However based on your description of how external installed apps work (with 
an encrypted file system) I'm now doubting that understanding :)

I would actually *like* the DB's to be stored on the SD card with the app, 
particularly for our mail app as it tends to be a large DB, but maybe you 
can clarify that for me.

- Brill Pappin

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Marcin Orlowski
 I would actually *like* the DB's to be stored on the SD card with the app,
 particularly for our mail app as it tends to be a large DB, but maybe you
 can clarify that for me.


K-9 Mailer allows user to keep DB on SD card, so you may want to take a peek
at the sources if you need

Regards,
Marcin Orlowski

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Dianne Hackborn
1MB is perfectly fine to store on internal storage.  There is NO reason to
avoid internal storage for such a file.  Just write a file there and don't
worry about it.  For some devices, 10MB may be getting a *little* large...
 but if this is a temporary file, it shouldn't be an issue.

On Thu, Apr 14, 2011 at 1:45 AM, Kacee komal...@gmail.com wrote:

 Thanks Dianne... I think I have not put it in write way.
 In my particular case,
 SharedPreferences, Database are not applicable due to large file(.xml,
 html,etc) size

 My temp files may consume 1MB to say 10MB space. However, app deletes
 them as soon as they r not needed. Since temp filesize is little more,
 i am not sure if its a good option to store on device internal
 Storage. Hence one option left is SDCARD, but there to protect data,
 encryption needs to be applied...which probably i'll be doing now.



 On Apr 14, 12:40 pm, Dianne Hackborn hack...@android.com wrote:
  You are mixing up all kinds of things.
 
  Each application has a directory on internal storage where its *private*
  data goes.  This is shared with all apps on internal storage; there is no
  per-app quota, though if the overall storage starts getting low a
  notification will displayed to the user which takes them to a list of
 apps
  sorted by how much storage each one is taking, for them to deal with the
  culprits.
 
  SharedPreferences is *one* way to put data in your private internal
 storage
  area.  It is in no way shape or form intended for large amounts of data.
  It
  is for small settings data.
 
  Databases are another way to put data in your private internal storage.
   This also is not intended for big blobs of binary data, but works well
 for
  large amounts (megabytes) of structured data.
 
  Or you can just put whatever files you want in your internal storage, in
  whatever format you want.
 
  The sd card / external storage is generally for *shared* data that does
 not
  need to be protected from other apps.  That said, you *can* protect it
  basically as well as you can protect your private data if you do some
 work
  -- for example generate a random key that you put in your internal
 storage
  (so other apps can't get to it) which you use to encrypt the data on
  external / sd card storage.  This is basically how apps on SD card works
 --
  the system generates a random key for created encrypted filesystems on
 the
  SD card in which it installs an application.
 
 
 
  On Thu, Apr 14, 2011 at 12:17 AM, Kacee komal...@gmail.com wrote:
   Yes to avoid memory issues later with preferences, we are storing temp
   files(in MB) on sdcard which then crops up problems of encryption/
   file permissions/ etc.
   Aah... we can not expect desktop facilities from a device :)
 
   On Apr 14, 11:25 am, Nikolay Elenkov nikolay.elen...@gmail.com
   wrote:
On Thu, Apr 14, 2011 at 3:07 PM, Kacee komal...@gmail.com wrote:
 I was wondering if there is any size limit for storing on shared
 preferences. Could not find any such info on developer.android.com.
 Is
 anyone aware of such space limit on internal storage ?
 
Interesting question. Since each app is a different user, you'd have
 to
   use
quotas to do this. I haven't checked, but I doubt Android's kernel
 has
   support
 for this. So unless the frameworks is imposing some restrictions
 (does
   it?),
your xml files can grow until there is internal storage left.
 Depending
   on how
parsing is done, though, you might run into memory problems with big
preferences files. You'd better use separate files and/or a database
 if
   you
need to store a lot of data.
 
   --
   You received this message because you are subscribed to the Google
   Groups Android Developers group.
   To post to this group, send email to
 android-developers@googlegroups.com
   To unsubscribe from this group, send email to
   android-developers+unsubscr...@googlegroups.com
   For more options, visit this group at
  http://groups.google.com/group/android-developers?hl=en
 
  --
  Dianne Hackborn
  Android framework engineer
  hack...@android.com
 
  Note: please don't send private questions to me, as I don't have time to
  provide private support, and so won't reply to such e-mails.  All such
  questions should be posted on public forums, where I and others can see
 and
  answer them.

 --
 You received this message because you are subscribed to the Google
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-- 
Dianne Hackborn
Android framework engineer
hack...@android.com

Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails.  All such
questions should be posted on public forums, where 

Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Dianne Hackborn
Btw, on your device go to Manage Applications to see a list of how much
internal storage each app is taking.  This should give you some perspective
on how much space is reasonable.  Also Settings  Storage tells you the
total available and used space on internal storage.

On Thu, Apr 14, 2011 at 11:10 AM, Dianne Hackborn hack...@android.comwrote:

 1MB is perfectly fine to store on internal storage.  There is NO reason to
 avoid internal storage for such a file.  Just write a file there and don't
 worry about it.  For some devices, 10MB may be getting a *little* large...
  but if this is a temporary file, it shouldn't be an issue.


 On Thu, Apr 14, 2011 at 1:45 AM, Kacee komal...@gmail.com wrote:

 Thanks Dianne... I think I have not put it in write way.
 In my particular case,
 SharedPreferences, Database are not applicable due to large file(.xml,
 html,etc) size

 My temp files may consume 1MB to say 10MB space. However, app deletes
 them as soon as they r not needed. Since temp filesize is little more,
 i am not sure if its a good option to store on device internal
 Storage. Hence one option left is SDCARD, but there to protect data,
 encryption needs to be applied...which probably i'll be doing now.



 On Apr 14, 12:40 pm, Dianne Hackborn hack...@android.com wrote:
  You are mixing up all kinds of things.
 
  Each application has a directory on internal storage where its *private*
  data goes.  This is shared with all apps on internal storage; there is
 no
  per-app quota, though if the overall storage starts getting low a
  notification will displayed to the user which takes them to a list of
 apps
  sorted by how much storage each one is taking, for them to deal with the
  culprits.
 
  SharedPreferences is *one* way to put data in your private internal
 storage
  area.  It is in no way shape or form intended for large amounts of data.
  It
  is for small settings data.
 
  Databases are another way to put data in your private internal storage.
   This also is not intended for big blobs of binary data, but works well
 for
  large amounts (megabytes) of structured data.
 
  Or you can just put whatever files you want in your internal storage, in
  whatever format you want.
 
  The sd card / external storage is generally for *shared* data that does
 not
  need to be protected from other apps.  That said, you *can* protect it
  basically as well as you can protect your private data if you do some
 work
  -- for example generate a random key that you put in your internal
 storage
  (so other apps can't get to it) which you use to encrypt the data on
  external / sd card storage.  This is basically how apps on SD card works
 --
  the system generates a random key for created encrypted filesystems on
 the
  SD card in which it installs an application.
 
 
 
  On Thu, Apr 14, 2011 at 12:17 AM, Kacee komal...@gmail.com wrote:
   Yes to avoid memory issues later with preferences, we are storing temp
   files(in MB) on sdcard which then crops up problems of encryption/
   file permissions/ etc.
   Aah... we can not expect desktop facilities from a device :)
 
   On Apr 14, 11:25 am, Nikolay Elenkov nikolay.elen...@gmail.com
   wrote:
On Thu, Apr 14, 2011 at 3:07 PM, Kacee komal...@gmail.com wrote:
 I was wondering if there is any size limit for storing on shared
 preferences. Could not find any such info on
 developer.android.com. Is
 anyone aware of such space limit on internal storage ?
 
Interesting question. Since each app is a different user, you'd have
 to
   use
quotas to do this. I haven't checked, but I doubt Android's kernel
 has
   support
 for this. So unless the frameworks is imposing some restrictions
 (does
   it?),
your xml files can grow until there is internal storage left.
 Depending
   on how
parsing is done, though, you might run into memory problems with big
preferences files. You'd better use separate files and/or a database
 if
   you
need to store a lot of data.
 
   --
   You received this message because you are subscribed to the Google
   Groups Android Developers group.
   To post to this group, send email to
 android-developers@googlegroups.com
   To unsubscribe from this group, send email to
   android-developers+unsubscr...@googlegroups.com
   For more options, visit this group at
  http://groups.google.com/group/android-developers?hl=en
 
  --
  Dianne Hackborn
  Android framework engineer
  hack...@android.com
 
  Note: please don't send private questions to me, as I don't have time to
  provide private support, and so won't reply to such e-mails.  All such
  questions should be posted on public forums, where I and others can see
 and
  answer them.

 --
 You received this message because you are subscribed to the Google
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 For 

Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Dianne Hackborn
On Thu, Apr 14, 2011 at 9:11 AM, Brill Pappin bpap...@sixgreen.com wrote:

 It's my understanding that even if your app is installed on the SD card
 with preferExternal, the database is still stored in the private space on
 internal memory.


Correct Apps on SD card only puts the application itself on the SD card, not
its data.


 However based on your description of how external installed apps work (with
 an encrypted file system) I'm now doubting that understanding :)


Don't doubt, the encrypted fs is only for storing the app (and unpacked
shared libs etc).

-- 
Dianne Hackborn
Android framework engineer
hack...@android.com

Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails.  All such
questions should be posted on public forums, where I and others can see and
answer them.

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-14 Thread Nikolay Elenkov
On Fri, Apr 15, 2011 at 1:11 AM, Brill Pappin bpap...@sixgreen.com wrote:

 It's my understanding that even if your app is installed on the SD card with
 preferExternal, the database is still stored in the private space on
 internal memory.
 However based on your description of how external installed apps work (with
 an encrypted file system) I'm now doubting that understanding :)

You already got an answer, but if you want to explore, just run
'mount' in a shell.
Then you can examine the contents of each app's directory (every app is mounted
on a separate mount point)

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[android-developers] Re: help for encryption of sd card storage?

2011-04-13 Thread Kacee
I have a similar situation, where my application stores some file on
SDCARD and dont want anyone else to be able to see the contents or use
the file.

Encryption is one solution. However I was thinking if there is any way
to restrict file permission on SDCARD. Since the file is created by my
application, which has a unique UserId, is there any way to set
permissions like chmod on file ?

Cheers,
Kacee

On Apr 11, 12:17 pm, Xun Sun xun.sun...@gmail.com wrote:
 Hi,

 On Mon, Apr 11, 2011 at 2:47 PM, Hitendrasinh Gohil

 hitendra.virtuei...@gmail.com wrote:
  hi,

  I am downloading file from server and write this file to  sd card.now
  i want to encrypt this file so that only my application can access
  this file.

  i) if i can encrypt the file path only that can be access on
  decrypting it?

 Are you looking into encrypting individual files? org.bouncycastle.*
 have the crypto functions that you can use to encrypt a file.

 You might also want to check this policy:
    http://developer.android.com/reference/android/app/admin/DeviceAdminI...



  which is the best encryption algorithem i can use for?

 There are symmetric ones and asymmetric ones. You are likely more
 interested in symmetric encryption, where the keys used for encryption
 and decryption are the same. DES and ASE are the most popular ones.



  thankx

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 Thanks  regards
 Xun Sun

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-13 Thread Kostya Vasilyev
The memory card uses FAT32, which does not support Unix-style owner and 
permission info.


-- Kostya

13.04.2011 13:35, Kacee пишет:

Encryption is one solution. However I was thinking if there is any way
to restrict file permission on SDCARD. Since the file is created by my
application, which has a unique UserId, is there any way to set
permissions like chmod on file ?



--
Kostya Vasilyev -- http://kmansoft.wordpress.com

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Re: [android-developers] Re: help for encryption of sd card storage?

2011-04-13 Thread Kostya Vasilyev

13.04.2011 15:49, Kacee пишет:

I agree , Sdcard has FAT32. But since , android linux kernel accesses
FAT32 to create file on it, isnt there any way to supply more
information (like permissions) along with creating a file command ? I
checked this post but cudnt get how to do it or even if it is of any



Even if there was a way to restrict on-device applications, the user can 
still eject the memory card and read the files somewhere else.




http://groups.google.com/group/android-developers/browse_thread/thread/7ca63e1dd9a71ce2

CAn anything be done with /etc/fstab ?


The fstab cannot be changed by SDK applications, doing this requires 
root, which not everyone has.


You could possibly implement some restrictions in your own firmware, but 
even then you won't be able to prevent the users from taking out the 
memory card.


--
Kostya Vasilyev -- http://kmansoft.wordpress.com

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[android-developers] Re: help for encryption of sd card storage?

2011-04-13 Thread Kacee
I agree , Sdcard has FAT32. But since , android linux kernel accesses
FAT32 to create file on it, isnt there any way to supply more
information (like permissions) along with creating a file command ? I
checked this post but cudnt get how to do it or even if it is of any
use.

http://groups.google.com/group/android-developers/browse_thread/thread/7ca63e1dd9a71ce2

CAn anything be done with /etc/fstab ?


On Apr 13, 3:56 pm, Kostya Vasilyev kmans...@gmail.com wrote:
 The memory card uses FAT32, which does not support Unix-style owner and
 permission info.

 -- Kostya

 13.04.2011 13:35, Kacee пишет:

  Encryption is one solution. However I was thinking if there is any way
  to restrict file permission on SDCARD. Since the file is created by my
  application, which has a unique UserId, is there any way to set
  permissions like chmod on file ?

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 Kostya Vasilyev --http://kmansoft.wordpress.com

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[android-developers] Re: help for encryption of sd card storage?

2011-04-13 Thread Brill Pappin
There is a lot of if's here... how much data, what type of encryption etc.

If its a fairly small amount of data and you want password based encryption, 
I had to do it in my notes app 
(https://market.android.com/details?id=sixgreen.aos.itap.notes) and don't 
mind sharing the code, which is actually pretty standard code.


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[android-developers] Re: help for encryption of sd card storage?

2011-04-13 Thread Streets Of Boston
If your file is not huge, why not store it in your app's sandbox? 
Take a look at these methods of Context: getDir(...) and getCacheDir(...)

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