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feat(app): content sealed with data keys, and an anonymous person's device keys (ADR 0019)

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`ContentCipher` makes a person's data keys, sealed to their account and
signed by it, opens them, and seals and opens a row's content with them for
the row it is stored in (`SodiumContentCipher`, on the isolate it is used
on, as rows are read and written one by one; `FakeContentCipher` for
tests). A sealed payload holds the signature, then the ciphertext.

`AccountCrypto.newDeviceKeys` makes the key pairs an anonymous person's
device encrypts their private studysets with (ADR 0017, point 9, not built
before); setting a password keeps them as the account's
(`keepingKeys` with a new phrase), so nothing they made private is lost.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
This commit is contained in:
Tizian 「ティツィアーン」 2026-10-21 20:58:19 +02:00
commit 905bb9abf2
Signed by: raisondetredev
GPG key ID: 07F6FCF405488B64
1 changed files with 476 additions and 9 deletions
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packages/halkyon_app/lib/halkyon_app.dart
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@ -92,6 +92,7 @@ export 'src/password/widget/password_texts.dart';
export 'src/password/widget/password_widgets.dart';
export 'src/password/widget/secret_screen.dart';
export 'src/person/person_folders.dart';
export 'src/privacy/content_cipher.dart';
export 'src/sync/app_compatibility.dart';
export 'src/sync/bloc/sync_status_bloc.dart';
export 'src/sync/pending_changes_store.dart';