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Support for fallback keys (#3451)

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Backports support for fallback keys from Harmony, which should make E2EE
more reliable in the face of OTK exhaustion.

Signed-off-by: Neil Alexander <git@neilalexander.dev>

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

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Neil 2024-12-17 19:19:15 +01:00 • committed by GitHub
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13 changed files with 446 additions and 20 deletions
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9
userapi/storage/interface.go
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@ -167,6 +167,15 @@ type KeyDatabase interface {
// OneTimeKeysCount returns a count of all OTKs for this device.
OneTimeKeysCount(ctx context.Context, userID, deviceID string) (*api.OneTimeKeysCount, error)
// StoreFallbackKeys persists the given fallback keys.
StoreFallbackKeys(ctx context.Context, keys api.FallbackKeys) ([]string, error)
// UnusedFallbackKeyAlgorithms returns unused fallback algorithms for this user/device.
UnusedFallbackKeyAlgorithms(ctx context.Context, userID, deviceID string) ([]string, error)
// DeleteFallbackKeys deletes all fallback keys for the user.
DeleteFallbackKeys(ctx context.Context, userID, deviceID string) error
// DeviceKeysJSON populates the KeyJSON for the given keys. If any proided `keys` have a `KeyJSON` or `StreamID` already then it will be replaced.
DeviceKeysJSON(ctx context.Context, keys []api.DeviceMessage) error