halkyon/apps/learn/halkyon_learn_client/lib/migrations/20261020185750538-recovery-proof-key/migration.json
Tizian 「ティツィアーン」 aea0c447fc
fix(auth)!: the recovery phrase is proved by a key of its own
A key proof was a signature by the account's signing key, which every
signed-in device keeps in its keyring: whoever could read one, with a
code from its authenticator, set a new password without the password or
the phrase (the second reading's H1). The phrase now proves itself with
an Ed25519 key derived from its bits alone (halkyon_keys'
recoveryProofKeysOf, KDF context hlkrprf1, a sibling of the recovery
key), whose public half every setup, new phrase and account reset sends
and the register keeps (account_password.recoveryProofKey); the device
derives the secret half only while the phrase is typed. An account
without one (none exist outside development) proves no phrase until it
sets a new one; decoys check against a decoy proof key alike.

Migration (module, Learn's and Todo's servers, Learn's device schema):
ALTER TABLE "account_password" ADD COLUMN "recoveryProofKey" bytea;
nullable, so rows made before keep working and no data is touched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
2026-10-23 14:12:43 +02:00

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{
"__className__": "serverpod.DatabaseMigration",
"actions": [
{
"__className__": "serverpod.DatabaseMigrationAction",
"type": "alterTable",
"alterTable": {
"__className__": "serverpod.TableMigration",
"name": "account_password",
"schema": "public",
"addColumns": [
{
"__className__": "serverpod.ColumnDefinition",
"name": "recoveryProofKey",
"fieldName": "recoveryProofKey",
"columnType": 5,
"isNullable": true,
"dartType": "dart:typed_data:ByteData?"
}
],
"deleteColumns": [],
"modifyColumns": [],
"addIndexes": [],
"deleteIndexes": [],
"addForeignKeys": [],
"deleteForeignKeys": [],
"warnings": []
}
}
],
"warnings": [],
"migrationApiVersion": 1
}