Encrypted db

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Ensure the application is providing a passphrase, for the SDK to encrypt the stored data.
The passphrase is stored in the SessionData, so that a Session created by Element Android can be restored (still need to create a PR on Element Android to store the passphrase to the correct location)

Enabled on Debug and Nightly builds for now.

• Existing sessions will have a null passphrase and will continue to work.
• New session will use a passphrase, only on Nightly and Debug build for now.

Motivation and context

Closes #2219
Part of #86

Screenshots / GIFs

Tests

• Upgrade an existing installation and see that the session can still be used
• If you log out and log in again, using the nightly version, or the debug version, a non-null passphrase will be used. And the app can be restarted without any issue.
• In release mode, no passphrase is used.

To check if the database is encrypted, you need access to the file storage of the device.
Database are stored at:

/data/user/0/io.element.android.x.debug/files/sessions/userId

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (54f3f8d) 69.95% compared to head (877ed3c) 69.99%.
Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2244      +/-   ##
===========================================
+ Coverage    69.95%   69.99%   +0.04%     
===========================================
  Files         1335     1335              
  Lines        32656    32643      -13     
  Branches      6791     6789       -2     
===========================================
+ Hits         22844    22848       +4     
+ Misses        6535     6518      -17     
  Partials      3277     3277              

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[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[ganfra]

LGTM, thanks!