57 lines
1.7 KiB
Swift
57 lines
1.7 KiB
Swift
//
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// Copyright 2025 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 struct AccountEntropyPool: Codable, Equatable {
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private enum CodingKeys: String, CodingKey {
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case rawString = "rawData"
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}
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public enum Constants {
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public static let byteLength: Int = 64 /* bytes */
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}
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/// The raw representation of the AEP, suitable for passing to LibSignal and
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/// other APIs.
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///
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/// - Important
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/// Not suitable for display to the user. See: `DisplayableAccountEntropyPool`.
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public let rawString: String
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public init() {
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let generatedKey: String = LibSignalClient.AccountEntropyPool.generate()
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owsAssertBeta(generatedKey == generatedKey.lowercased())
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self.rawString = generatedKey
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}
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public init(key: String) throws {
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let normalizedKey = key.lowercased()
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guard LibSignalClient.AccountEntropyPool.isValid(normalizedKey) else {
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throw OWSAssertionError("Invalid entropy pool key")
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}
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self.rawString = normalizedKey
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}
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// MARK: - Derived Keys
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public func getMasterKey() -> MasterKey {
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// Force unwrap here. At this point, the AEP value should either have been validated by
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// LibSignal on init, or generated by LibSignal, so should correctly generate a MasterKey.
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return try! MasterKey(data: try! LibSignalClient.AccountEntropyPool.deriveSvrKey(rawString))
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}
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public func getBackupKey() -> BackupKey {
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return try! LibSignalClient.AccountEntropyPool.deriveBackupKey(rawString)
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}
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public func getLoggingKey() -> String {
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return String(getMasterKey().data(for: .loggingKey).canonicalStringRepresentation.suffix(4))
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}
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}
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