56 lines
1.7 KiB
Swift
56 lines
1.7 KiB
Swift
//
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// Copyright 2022 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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import SignalCoreKit
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@objc
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public class SMKUDAccessKey: NSObject {
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@objc
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public static let kUDAccessKeyLength: Int = 16
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@objc
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public let keyData: Data
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@objc
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public init(profileKey: Data) throws {
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self.keyData = try Data(ProfileKey(contents: [UInt8](profileKey)).deriveAccessKey())
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}
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@objc
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public init(randomKeyData: ()) {
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self.keyData = Randomness.generateRandomBytes(Int32(SMKUDAccessKey.kUDAccessKeyLength))
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}
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private init(keyData: Data) {
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self.keyData = keyData
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}
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/// Used to compose multiple Unidentified-Access-Keys for the multiRecipient endpoint
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public static func ^ (lhs: SMKUDAccessKey, rhs: SMKUDAccessKey) -> SMKUDAccessKey {
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owsAssert(lhs.keyData.count == SMKUDAccessKey.kUDAccessKeyLength)
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owsAssert(rhs.keyData.count == SMKUDAccessKey.kUDAccessKeyLength)
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let xoredBytes = zip(lhs.keyData, rhs.keyData).map(^)
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return .init(keyData: Data(xoredBytes))
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}
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// MARK:
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override public func isEqual(_ object: Any?) -> Bool {
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guard let other = object as? SMKUDAccessKey else { return false }
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return self.keyData == other.keyData
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}
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// Unrestricted UD recipients should have a zeroed access key sent to the multi-recipient endpoint
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// For a collection of mixed recipients, a zeroed key will have no effect composing keys with xor
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// For a collection of only unrestricted UD recipients, the server expects a zero access key
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public static var zeroedKey: SMKUDAccessKey {
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.init(keyData: Data(repeating: 0, count: kUDAccessKeyLength))
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}
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}
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