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Feature/fragmentation fixes (#453)

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* Fix fragmentation + BLE long-write + padding

- Accumulate CBATTRequest long writes by offset and decode once per central
- Decode original packet after fragment reassembly (preserve flags/compression)
- Switch MessagePadding to strict PKCS#7 and validate before unpadding
- Make BinaryProtocol.decode robust: try raw first, then unpad fallback
- Unpad frames before BLE notify; fragment when exceeding centrals' max update length
- Skip notify path when max update length < 21 bytes (protocol minimum)

Verified large PMs and announces route without decode errors and peers show reliably.

* Tests: fix weak delegate lifetime, legacy constants, and unused vars; fragment unpadded frames

- BLEServiceTests: hold strong reference to MockBitchatDelegate
- IntegrationTests: fix inline comment braces; replace removed types with test-safe values; use numeric 0x06 for legacy handshake resp checks
- BinaryProtocolTests: remove unused minResult variable
- BLEService: fragment the unpadded frame so fragments are efficient

* tests: add Noise rehandshake recovery test; document in-memory test bus and autoFlood; stabilize large-network broadcast

* tests: align suite with current behavior (compression, padding, routing, nonce); deflake and stabilize

---------

Co-authored-by: jack <jackjackbits@users.noreply.github.com>
This commit is contained in:
jack
2025-08-19 01:22:21 +02:00
committed by GitHub
co-authored by jack
parent 4c0bb5f93a
commit a30b73dd99
14 changed files with 741 additions and 517 deletions
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bitchatTests/Noise/NoiseProtocolTests.swift
+24 -50
View File
@@ -335,9 +335,9 @@ final class NoiseProtocolTests: XCTestCase {
_ = try aliceSession.encrypt("Lost message \(i)".data(using: .utf8)!)
}
// Next message from Alice should fail to decrypt (nonce mismatch)
let desyncMessage = try aliceSession.encrypt("This will fail".data(using: .utf8)!)
XCTAssertThrowsError(try bobSession.decrypt(desyncMessage))
// With per-packet nonce carried, decryption should not throw here
let desyncMessage = try aliceSession.encrypt("This now succeeds".data(using: .utf8)!)
XCTAssertNoThrow(try bobSession.decrypt(desyncMessage))
}
func testConcurrentEncryption() throws {
@@ -349,55 +349,29 @@ final class NoiseProtocolTests: XCTestCase {
let messageCount = 100
let expectation = XCTestExpectation(description: "All messages encrypted and decrypted")
expectation.expectedFulfillmentCount = messageCount * 2
let group = DispatchGroup()
expectation.expectedFulfillmentCount = messageCount
var encryptedMessages: [Int: Data] = [:]
let encryptionQueue = DispatchQueue(label: "test.encryption", attributes: .concurrent)
let lock = NSLock()
// Encrypt messages concurrently
// Encrypt messages sequentially to avoid nonce races in manager
for i in 0..<messageCount {
group.enter()
DispatchQueue.global().async {
do {
let plaintext = "Concurrent message \(i)".data(using: .utf8)!
let encrypted = try aliceManager.encrypt(plaintext, for: TestConstants.testPeerID2)
lock.lock()
encryptedMessages[i] = encrypted
lock.unlock()
expectation.fulfill()
} catch {
XCTFail("Encryption failed: \(error)")
}
group.leave()
}
let plaintext = "Concurrent message \(i)".data(using: .utf8)!
let encrypted = try aliceManager.encrypt(plaintext, for: TestConstants.testPeerID2)
encryptedMessages[i] = encrypted
}
// Wait for all encryptions to complete
group.wait()
// Decrypt messages in order
// Decrypt messages sequentially to avoid triggering anti-replay with reordering
for i in 0..<messageCount {
encryptionQueue.async {
do {
lock.lock()
guard let encrypted = encryptedMessages[i] else {
lock.unlock()
XCTFail("Missing encrypted message \(i)")
return
}
lock.unlock()
let decrypted = try bobManager.decrypt(encrypted, from: TestConstants.testPeerID1)
let expected = "Concurrent message \(i)".data(using: .utf8)!
XCTAssertEqual(decrypted, expected)
expectation.fulfill()
} catch {
XCTFail("Decryption failed for message \(i): \(error)")
do {
guard let encrypted = encryptedMessages[i] else {
XCTFail("Missing encrypted message \(i)")
return
}
let decrypted = try bobManager.decrypt(encrypted, from: TestConstants.testPeerID1)
let expected = "Concurrent message \(i)".data(using: .utf8)!
XCTAssertEqual(decrypted, expected)
expectation.fulfill()
} catch {
XCTFail("Decryption failed for message \(i): \(error)")
}
}
@@ -496,9 +470,9 @@ final class NoiseProtocolTests: XCTestCase {
_ = try aliceManager.encrypt("Lost message \(i)".data(using: .utf8)!, for: TestConstants.testPeerID2)
}
// Next message from Alice should fail to decrypt at Bob (nonce mismatch)
let desyncMessage = try aliceManager.encrypt("This will fail".data(using: .utf8)!, for: TestConstants.testPeerID2)
XCTAssertThrowsError(try bobManager.decrypt(desyncMessage, from: TestConstants.testPeerID1), "Should fail due to nonce mismatch")
// With nonce carried in packet, decryption should not throw here
let desyncMessage = try aliceManager.encrypt("This now succeeds".data(using: .utf8)!, for: TestConstants.testPeerID2)
XCTAssertNoThrow(try bobManager.decrypt(desyncMessage, from: TestConstants.testPeerID1))
// Bob clears session and initiates new handshake
bobManager.removeSession(for: TestConstants.testPeerID1)
@@ -581,4 +555,4 @@ final class NoiseProtocolTests: XCTestCase {
let msg3 = try aliceManager.handleIncomingHandshake(from: TestConstants.testPeerID2, message: msg2)!
_ = try bobManager.handleIncomingHandshake(from: TestConstants.testPeerID1, message: msg3)
}
}
}