Final crypto changes for BTPv2. #111

This patch brings the implementation into line with the BTPv2 spec. Changes:

* Use BLAKE2s to generate tags
* KDF arguments for key rotation
* Frame IV format

Closes #111.

See merge request !48

Addresses comments for !48.

Remove Read/WritePrivateMessageActivity. #208

Removed obsolete activities and cleaned up some code.

See merge request !55

Also removed some unused code from BaseActivity.

Improve PasswordActivity

* removing screen border visible on small screens
* showing noticeable error message on wrong password input
* showing keyboard again after entering wrong password
* making lost password link easier to recognize as link
* renaming keyboard toggle method from 'hide' to 'toggle'

See merge request !53

* removing screen border visible on small screens
* showing noticeable error message on wrong password input
* showing keyboard again after entering wrong password
* making lost password link easier to recognize as link
* renaming keyboard toggle method from 'hide' to 'toggle'

Use new BriarRecyclerView in ConversationView

This now handles progress bar and empty view itself.
With this commit, it also scrolls down on layout changes like when
keyboard is opened.

See merge request !46

Fix contacts duplicating itself when pressing back button in conversation view.

Normally, this should be handled by the `SortedList` in the `RecyclerView`, but it isn't for some reason. Instead of spending way too much time on finding out why, I am clearing the adapter instead (on each `activity.onResume()`) as it was done before.

Closes #200

See merge request !42

Use BLAKE2s to generate tags.
KDF arguments for key rotation.
Frame IV format.

Use BLAKE2s for hashing, key derivation and signatures

SHA-256 is still used for password-based key derivation (will be replaced with Argon2) and Fortuna.

See merge request !47

SHA-256 is still used for password-based key derivation (will be replaced with Argon2) and Fortuna.

This is done by update existing items rather than just adding them,
because different timestamps in added items change the sorting criteria
and cause duplicates in the SortedList.

Closes #200

BLAKE2s implementation

Implementation is based on the BLAKE2b implementation from BouncyCastle, and is
therefore licensed under the BouncyCastle license (which will make future
upstreaming of the code easier).

Closes #189.

See merge request !39

Implementation is based on the BLAKE2b implementation from BouncyCastle, and is
therefore licensed under the BouncyCastle license (which will make future
upstreaming of the code easier).

This now handles progress bar and empty view itself.
With this commit, it also scrolls down on layout changes like when
keyboard is opened.

Fix SetupActivity warnings for API 10

Closes #176.

The manual setting of the error message color also (strangely) stops the message from disappearing every second character. I'm not complaining ^_^

I guessed that the text color problem probably stopped occurring from API 14 (at the big 4.0 overhaul), but it would be great if someone could confirm.

See merge request !40

Also fixed some IME action issues on Android 2.3.

Create custom BriarRecyclerView and use it for the contact list.

It is a common pattern to have a list with an empty view and a progress bar.
This commit introduces a custom BriarRecyclerView and uses it for the
contact list.

No more manually hiding and showing empty views and progress bars is
necessary when using the new BriarRecyclerView instead of RecyclerView.

Please note that this conflicts with !44 at the moment and needs to be
implemented for !36 once merged.

Closes #198

See merge request !45

Overhauled Conversation View with Message Bubbles

The Conversation View now uses a RecyclerView with conversation bubbles
in alternating colors and vector drawables to indicate message state.

The conversation bubbles have been taken from Telegram
and can be replaced by a UX designer later.
There's also a special bubble for unread messages,
so they are not overlooked when they come in delayed.

This commit also addresses #9, because message text can
now be selected and copied. This is done by using

    android:textIsSelectable="true"

which only works for API level 11 or higher.

If we want copy and paste on lower API levels,
additional measures have to be implemented.

See merge request !36

It is a common pattern to have a list with an empty view and a progress bar.
This commit introduces a custom BriarRecyclerView and uses it for the
contact list.

No more manually hiding and showing empty views and progress bars is
necessary when using the new BriarRecyclerView instead of RecyclerView.

Please note that this conflicts with !44 at the moment and needs to be
implemented for !36 once merged.

Closes #198

Add a floating action button (FAB) in the contact list

The button hides itself when you scroll down the list of contacts
and shows again when you scroll up.

To properly color the button, the accent color has been defined.
It uses the same color as the action bar (primary color).
I leave it to a UX designer to adapt the color scheme.

Please note that the design support library was used.
It includes the app-compat library, so this has been removed
from the `build.gradle` file.

Closes #199

See merge request !44

The button hides itself when you scroll down the list of contacts
and shows again when you scroll up.

To properly color the button, the accent color has been defined.
It uses the same color as the action bar (primary color).
I leave it to a UX designer to adapt the color scheme.

Please note that the design support library was used.
It includes the app-compat library, so this has been removed
from the `build.gradle` file.

Closes #199

Do not show green text for enabled transports, use only green icons.

This addresses part of #197 and is a fairly small change.

See merge request !43

This addresses part of #197

Show home screen if user backs out of password activity

This borrows a technique from @grote's crash reporter patch to fix #7. If the user presses the back button in PasswordActivity, the home screen is shown. Previously, pressing the back button removed PasswordActivity from the back stack, causing the next activity in the back stack to spawn another PasswordActivity.


See merge request !41

Use XSalsa20-Poly1305 instead of AES-GCM for transport encryption and password storage.

This patch integrates @str4d's new authenticated cipher implementation. It depends on !18.

See merge request !35

properly notify the view adapter of dataset changes
in order to avoid invalidating the entire dataset when not absolutely necessary.

This change also shows unread messages in a different color,
so users do not fail to notice delayed messages.