mirror of
https://github.com/permissionlesstech/bitchat.git
synced 2026-07-26 05:25:20 +00:00
Remove dead code and placeholders
- Remove NoisePostQuantum.swift entirely (placeholder with no implementation) - Remove Double Ratchet placeholder code from NoiseChannelKeyRotation.swift - Remove NoisePostQuantumTests that tested mock implementations - Handle TODO for version negotiation rejection (now properly disconnects) - Remove legacy comment about removed message type 0x02 - Keep deprecated ownerID field as it's still used for compatibility This cleanup removes ~400 lines of placeholder code that was not being used and unlikely to be implemented in the near future.
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jack
@@ -293,37 +293,4 @@ class NoiseChannelKeyRotation {
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_ = KeychainManager.shared.deleteChannelPassword(for: epochKey)
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}
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}
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}
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// MARK: - Future Double Ratchet Support
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/// Placeholder for full Double Ratchet implementation
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/// This would handle per-message key derivation and ratcheting
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protocol DoubleRatchetProtocol {
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/// Initialize a new ratchet session
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func initializeRatchet(sharedSecret: Data, isInitiator: Bool) throws
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/// Ratchet forward and get next message key
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func ratchetEncrypt(_ plaintext: Data) throws -> (ciphertext: Data, header: Data)
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/// Ratchet forward using received header and decrypt
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func ratchetDecrypt(_ ciphertext: Data, header: Data) throws -> Data
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}
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/// Message header for Double Ratchet (future use)
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struct RatchetHeader: Codable {
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let publicKey: Data // Ephemeral public key
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let previousChainLength: UInt32
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let messageNumber: UInt32
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}
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/// Placeholder for full implementation
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class ChannelDoubleRatchet {
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// This would implement the full Double Ratchet algorithm
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// adapted for multi-party channels
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// Challenges:
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// - Sender keys for multi-party
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// - Out-of-order delivery
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// - State synchronization
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// - Performance with many members
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}
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@@ -1,285 +0,0 @@
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//
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// NoisePostQuantum.swift
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// bitchat
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//
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// This is free and unencumbered software released into the public domain.
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// For more information, see <https://unlicense.org>
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//
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import Foundation
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import CryptoKit
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// MARK: - Post-Quantum Cryptography Framework
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/// Framework for integrating post-quantum algorithms with Noise Protocol
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/// Currently a placeholder until PQ libraries are available in Swift/iOS
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protocol PostQuantumKeyExchange {
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associatedtype PublicKey
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associatedtype PrivateKey
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associatedtype SharedSecret
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/// Generate a new keypair
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static func generateKeyPair() throws -> (publicKey: PublicKey, privateKey: PrivateKey)
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/// Derive shared secret (for initiator)
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static func encapsulate(remotePublicKey: PublicKey) throws -> (sharedSecret: SharedSecret, ciphertext: Data)
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/// Derive shared secret (for responder)
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static func decapsulate(ciphertext: Data, privateKey: PrivateKey) throws -> SharedSecret
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/// Get size requirements
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static var publicKeySize: Int { get }
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static var privateKeySize: Int { get }
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static var ciphertextSize: Int { get }
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static var sharedSecretSize: Int { get }
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}
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// MARK: - Hybrid Key Exchange
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/// Combines classical (Curve25519) with post-quantum algorithms
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class HybridNoiseKeyExchange {
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enum Algorithm {
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case classicalOnly // Current: Curve25519 only
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case hybridKyber768 // Future: Curve25519 + Kyber768
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case hybridKyber1024 // Future: Curve25519 + Kyber1024
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var name: String {
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switch self {
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case .classicalOnly:
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return "25519"
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case .hybridKyber768:
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return "25519+Kyber768"
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case .hybridKyber1024:
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return "25519+Kyber1024"
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}
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}
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var isPostQuantum: Bool {
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switch self {
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case .classicalOnly:
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return false
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case .hybridKyber768, .hybridKyber1024:
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return true
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}
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}
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}
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struct HybridPublicKey {
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let classical: Curve25519.KeyAgreement.PublicKey
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let postQuantum: Data? // Future: actual PQ public key
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var serialized: Data {
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var data = classical.rawRepresentation
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if let pq = postQuantum {
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data.append(pq)
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}
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return data
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}
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}
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struct HybridPrivateKey {
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let classical: Curve25519.KeyAgreement.PrivateKey
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let postQuantum: Data? // Future: actual PQ private key
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}
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struct HybridSharedSecret {
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let classical: SharedSecret
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let postQuantum: Data? // Future: actual PQ shared secret
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/// Combine both secrets using KDF
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func combinedSecret() -> SymmetricKey {
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var combinedData = classical.withUnsafeBytes { Data($0) }
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if let pq = postQuantum {
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combinedData.append(pq)
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}
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// Use HKDF to combine secrets
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let hash = SHA256.hash(data: combinedData)
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return SymmetricKey(data: Data(hash))
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}
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}
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// MARK: - Key Generation
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static func generateKeyPair(algorithm: Algorithm) throws -> (publicKey: HybridPublicKey, privateKey: HybridPrivateKey) {
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// Generate classical keypair
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let classicalPrivate = Curve25519.KeyAgreement.PrivateKey()
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let classicalPublic = classicalPrivate.publicKey
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// Generate PQ keypair when available
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let pqPublic: Data? = nil
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let pqPrivate: Data? = nil
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switch algorithm {
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case .classicalOnly:
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break // No PQ component
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case .hybridKyber768, .hybridKyber1024:
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// Future: Generate Kyber keypair
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// let (pqPub, pqPriv) = try KyberKeyExchange.generateKeyPair()
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// pqPublic = pqPub.serialized
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// pqPrivate = pqPriv.serialized
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break
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}
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return (
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HybridPublicKey(classical: classicalPublic, postQuantum: pqPublic),
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HybridPrivateKey(classical: classicalPrivate, postQuantum: pqPrivate)
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)
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}
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// MARK: - Key Agreement
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static func performKeyAgreement(
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localPrivate: HybridPrivateKey,
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remotePublic: HybridPublicKey,
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algorithm: Algorithm
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) throws -> HybridSharedSecret {
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// Perform classical ECDH
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let classicalShared = try localPrivate.classical.sharedSecretFromKeyAgreement(
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with: remotePublic.classical
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)
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// Perform PQ key agreement when available
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let pqShared: Data? = nil
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switch algorithm {
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case .classicalOnly:
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break // No PQ component
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case .hybridKyber768, .hybridKyber1024:
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// Future: Perform Kyber decapsulation
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// if let pqCiphertext = remotePublic.postQuantum,
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// let pqPrivateKey = localPrivate.postQuantum {
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// pqShared = try KyberKeyExchange.decapsulate(
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// ciphertext: pqCiphertext,
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// privateKey: pqPrivateKey
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// )
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// }
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break
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}
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return HybridSharedSecret(classical: classicalShared, postQuantum: pqShared)
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}
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}
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// MARK: - Modified Noise Pattern for PQ
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/// Extended Noise handshake pattern for post-quantum
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/// Based on Noise PQ patterns: https://github.com/noiseprotocol/noise_pq_spec
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struct NoisePQHandshakePattern {
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// Pattern modifiers for PQ
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enum Modifier {
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case pq1 // First message includes PQ KEM
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case pq2 // Second message includes PQ KEM
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case pq3 // Third message includes PQ KEM
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}
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// Example: XXpq1 pattern (XX with PQ in first message)
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// -> e, epq
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// <- e, ee, eepq, s, es
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// -> s, se
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// This would modify the Noise XX pattern to include
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// post-quantum key encapsulation material
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}
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// MARK: - Migration Support
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/// Helps transition from classical to post-quantum crypto
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class NoiseProtocolMigration {
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enum MigrationPhase {
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case classicalOnly // Current state
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case hybridOptional // Support both, prefer hybrid
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case hybridRequired // Require hybrid mode
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case postQuantumOnly // Future: PQ only
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}
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struct MigrationConfig {
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let currentPhase: MigrationPhase
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let preferredAlgorithm: HybridNoiseKeyExchange.Algorithm
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let acceptedAlgorithms: Set<HybridNoiseKeyExchange.Algorithm>
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let migrationDeadline: Date?
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}
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/// Check if a peer supports post-quantum
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static func checkPQSupport(peerVersion: String) -> Bool {
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// Future: Parse peer capabilities
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// For now, assume no PQ support
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return false
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}
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/// Get migration configuration
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static func getMigrationConfig() -> MigrationConfig {
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// Current configuration: classical only
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return MigrationConfig(
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currentPhase: .classicalOnly,
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preferredAlgorithm: .classicalOnly,
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acceptedAlgorithms: [.classicalOnly],
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migrationDeadline: nil
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)
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}
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}
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// MARK: - Future Implementation Notes
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/*
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Post-Quantum Integration Plan:
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1. Wait for stable Swift PQ libraries (e.g., SwiftOQS)
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2. Implement Kyber768/1024 wrapper conforming to PostQuantumKeyExchange
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3. Update Noise handshake to support hybrid mode
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4. Add capability negotiation in protocol
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5. Implement gradual rollout with fallback
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Challenges:
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- Increased message sizes (Kyber768 public key ~1184 bytes)
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- Performance impact on mobile devices
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- Battery usage considerations
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- Backward compatibility
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- Library availability and maintenance
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Timeline estimate:
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- PQ libraries stable in Swift: 2025-2026
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- Initial hybrid implementation: 2026
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- Full deployment: 2027+
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*/
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// MARK: - Testing Support
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#if DEBUG
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/// Mock PQ implementation for testing
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class MockPostQuantumKeyExchange: PostQuantumKeyExchange {
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typealias PublicKey = Data
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typealias PrivateKey = Data
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typealias SharedSecret = Data
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static func generateKeyPair() throws -> (publicKey: Data, privateKey: Data) {
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// Generate mock keys for testing
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let privateKey = Data((0..<32).map { _ in UInt8.random(in: 0...255) })
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let publicKey = Data((0..<800).map { _ in UInt8.random(in: 0...255) }) // Simulate larger PQ key
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return (publicKey, privateKey)
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}
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static func encapsulate(remotePublicKey: Data) throws -> (sharedSecret: Data, ciphertext: Data) {
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let sharedSecret = Data((0..<32).map { _ in UInt8.random(in: 0...255) })
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let ciphertext = Data((0..<1088).map { _ in UInt8.random(in: 0...255) }) // Simulate Kyber ciphertext
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return (sharedSecret, ciphertext)
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}
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static func decapsulate(ciphertext: Data, privateKey: Data) throws -> Data {
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// Return deterministic secret based on inputs for testing
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let combined = ciphertext + privateKey
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let hash = SHA256.hash(data: combined)
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return Data(hash)
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}
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static var publicKeySize: Int { 800 }
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static var privateKeySize: Int { 1632 }
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static var ciphertextSize: Int { 1088 }
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static var sharedSecretSize: Int { 32 }
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}
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#endif
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