Sofía Aritz 2078c82f45 Add a migration system for the new password system

Added an automatic migration system for notes before the #1 redesign.

Ths system works as follows:
1. Checks the password system used.
2. If it's the old system, the migration is started.
3. The data directory is backed up.
4. The notes are decrypted using the old password.
5. The notes are encrypted and saved using the `KDF(password)`

This commit also adds documentation related to future migrations of the "password system" and which migrations will be supported by each future version.

This documents also showcases that when v1 is released, support for `PasswordSystem::V0` will be completely removed.

2023-03-06 18:23:37 +01:00

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Password migrations

After issue #1, the migration of old "databases" was required. Right now, this isn't very useful because the only user is (probably) me, but this serves as an exercise for the future.

Password systems

Currently, there are two password systems on-the-wild:

PasswordSystem::V0. The system used before issue #1
PasswordSystem::V1. The system used after issue #1 (with the KDF)

Support

Only the latest and previous password system are going to be supported at any point in time.

Example

v1 uses PasswordSystem::V1 and supports migration from PasswordSystem::V0
v2 is released with the PasswordSystem::V2 and migration from PasswordSystem::V1, those who are still on the PasswordSystem::V0 are redirected to the latest v1 release.

Currently supported systems

v0.*: PasswordSystem::V1 and migration from PasswordSystem::V0
v1.*:
- If a new system is used: PasswordSystem::V2 and migration from PasswordSystem::V1
- If no new system is used: PasswordSystem::V1
v2.*:
- If a new system is used: PasswordSystem::V3 and migration from PasswordSystem::V2
- If no new system is used: PasswordSystem::V2 and migration from PasswordSystem::V1

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