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feat(backup): sealed backups + printable recovery sheet

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'Save a backup' now writes a sealed .tanemaki file (AES-256-GCM under a
key HKDF-derived from the root seed; format TANEBK v1, open and stable).
Restoring on the same identity is silent; a copy sealed by another
identity asks for the printed recovery code (TANE1 base32, typo-tolerant)
and adopts that seed — recovering your bank recovers you. Legacy plain
exports still restore. Settings gains a recovery sheet (QR + code PDF).
BackupBox/RecoveryCode live in commons_core, pure Dart, TDD.
This commit is contained in:
vjrj 2026-07-09 22:32:13 +02:00
parent ba87bf2719
commit d6781870d9
19 changed files with 1016 additions and 81 deletions
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8
pubspec.lock
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@ -225,6 +225,14 @@ packages:
url: "https://pub.dev"
source: hosted
version: "3.0.7"
cryptography:
dependency: transitive
description:
name: cryptography
sha256: "3eda3029d34ec9095a27a198ac9785630fe525c0eb6a49f3d575272f8e792ef0"
url: "https://pub.dev"
source: hosted
version: "2.9.0"
csslib:
dependency: transitive
description: