58 lines
3.5 KiB
Swift
58 lines
3.5 KiB
Swift
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@objc(LKDeviceLinkingUtilities)
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public final class DeviceLinkingUtilities : NSObject {
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private static var lastUnexpectedDeviceLinkRequestDate: Date? = nil
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private override init() { }
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@objc public static var shouldShowUnexpectedDeviceLinkRequestReceivedAlert: Bool {
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let now = Date()
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if let lastUnexpectedDeviceLinkRequestDate = lastUnexpectedDeviceLinkRequestDate {
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if now.timeIntervalSince(lastUnexpectedDeviceLinkRequestDate) < 30 { return false }
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}
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lastUnexpectedDeviceLinkRequestDate = now
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return true
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}
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// When requesting a device link, the slave device signs the master device's public key. When authorizing
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// a device link, the master device signs the slave device's public key.
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public static func getLinkingRequestMessage(for masterPublicKey: String) -> DeviceLinkMessage {
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let slaveKeyPair = OWSIdentityManager.shared().identityKeyPair()!
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let slavePublicKey = slaveKeyPair.hexEncodedPublicKey
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var kind = UInt8(LKDeviceLinkMessageKind.request.rawValue)
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let data = Data(hex: masterPublicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
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let slaveSignature = try! Ed25519.sign(data, with: slaveKeyPair)
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let thread = TSContactThread.getOrCreateThread(contactId: masterPublicKey)
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return DeviceLinkMessage(in: thread, masterPublicKey: masterPublicKey, slavePublicKey: slavePublicKey, masterSignature: nil, slaveSignature: slaveSignature)
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}
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public static func getLinkingAuthorizationMessage(for deviceLink: DeviceLink) -> DeviceLinkMessage {
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let masterKeyPair = OWSIdentityManager.shared().identityKeyPair()!
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let masterPublicKey = masterKeyPair.hexEncodedPublicKey
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let slavePublicKey = deviceLink.slave.publicKey
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var kind = UInt8(LKDeviceLinkMessageKind.authorization.rawValue)
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let data = Data(hex: slavePublicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
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let masterSignature = try! Ed25519.sign(data, with: masterKeyPair)
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let slaveSignature = deviceLink.slave.signature!
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let thread = TSContactThread.getOrCreateThread(contactId: slavePublicKey)
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return DeviceLinkMessage(in: thread, masterPublicKey: masterPublicKey, slavePublicKey: slavePublicKey, masterSignature: masterSignature, slaveSignature: slaveSignature)
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}
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public static func hasValidSlaveSignature(_ deviceLink: DeviceLink) -> Bool {
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guard let slaveSignature = deviceLink.slave.signature else { return false }
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let slavePublicKey = Data(hex: deviceLink.slave.publicKey.removing05PrefixIfNeeded())
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var kind = UInt8(LKDeviceLinkMessageKind.request.rawValue)
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let data = Data(hex: deviceLink.master.publicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
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return (try? Ed25519.verifySignature(slaveSignature, publicKey: slavePublicKey, data: data)) ?? false
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}
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public static func hasValidMasterSignature(_ deviceLink: DeviceLink) -> Bool {
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guard let masterSignature = deviceLink.master.signature else { return false }
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let masterPublicKey = Data(hex: deviceLink.master.publicKey.removing05PrefixIfNeeded())
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var kind = UInt8(LKDeviceLinkMessageKind.authorization.rawValue)
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let data = Data(hex: deviceLink.slave.publicKey) + Data(bytes: &kind, count: MemoryLayout.size(ofValue: kind))
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return (try? Ed25519.verifySignature(masterSignature, publicKey: masterPublicKey, data: data)) ?? false
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}
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}
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