50 lines
1.3 KiB
Swift
50 lines
1.3 KiB
Swift
//
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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public import LibSignalClient
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public enum BackupKeyMaterialError: Error {
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case missingMessageBackupKey
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case missingMediaRootBackupKey
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/// Encountered an error using libsignal methods to derive keys.
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case derivationError(Error)
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}
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public enum MediaTierEncryptionType: CaseIterable {
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case outerLayerFullsizeOrThumbnail
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case transitTierThumbnail
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}
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public struct MediaTierEncryptionMetadata: Equatable {
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let type: MediaTierEncryptionType
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let mediaId: Data
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let hmacKey: Data
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let aesKey: Data
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public var encryptionKey: Data {
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return aesKey + hmacKey
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}
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}
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extension BackupKey {
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public func asMessageBackupKey(for aci: Aci) throws -> MessageBackupKey {
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try MessageBackupKey(backupKey: self, backupId: self.deriveBackupId(aci: aci))
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}
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}
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public protocol BackupKeyMaterial {
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func backupKey(
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type: BackupAuthCredentialType,
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tx: DBReadTransaction
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) throws(BackupKeyMaterialError) -> BackupKey
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func mediaEncryptionMetadata(
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mediaName: String,
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type: MediaTierEncryptionType,
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tx: DBReadTransaction
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) throws(BackupKeyMaterialError) -> MediaTierEncryptionMetadata
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}
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