41 lines
1.7 KiB
Swift
41 lines
1.7 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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import LibSignalClient
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enum MessageBackupKeyMaterialError: Error {
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case invalidKeyInfo
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case missingMasterKey
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case notRegistered
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case invalidEncryptionKey
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}
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public protocol MessageBackupKeyMaterial {
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/// Backup ID material derived from a combination of the backup key and the
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/// local ACI. This ID is used both as the salt for the backup encryption and
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/// to create the anonymous credentials for interacting with server stored backups
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func backupID(localAci: Aci, tx: DBReadTransaction) throws -> Data
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/// Private key derived from the BackupKey + ACI that is used for signing backup auth presentations.
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func backupPrivateKey(localAci: Aci, tx: DBReadTransaction) throws -> PrivateKey
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/// LibSignal.BackupAuthCredentialRequestContext derived from the ACI and BackupKey and used primarily
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/// for building backup credentials.
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func backupAuthRequestContext(localAci: Aci, tx: DBReadTransaction) throws -> BackupAuthCredentialRequestContext
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func messageBackupKey(localAci: Aci, tx: DBReadTransaction) throws -> MessageBackupKey
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/// Builds an encrypting StreamTransform object derived from the backup master key and the backupID
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func createEncryptingStreamTransform(localAci: Aci, tx: DBReadTransaction) throws -> EncryptingStreamTransform
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func createDecryptingStreamTransform(localAci: Aci, tx: DBReadTransaction) throws -> DecryptingStreamTransform
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func createHmacGeneratingStreamTransform(localAci: Aci, tx: DBReadTransaction) throws -> HmacStreamTransform
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func createHmacValidatingStreamTransform(localAci: Aci, tx: DBReadTransaction) throws -> HmacStreamTransform
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}
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