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Merge pull request #957 from permissionlesstech/fix/noise-protocol-compatibility

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jack
2026-01-13 13:07:49 -10:00
committed by GitHub
parent 7b9ffe464a 9bac52051a
commit fa3c74f941
1 changed files with 22 additions and 17 deletions
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bitchat/Noise/NoiseProtocol.swift
+18 -13
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@@ -129,9 +129,7 @@ struct NoiseProtocolName {
/// - Warning: Nonce reuse would be catastrophic for security
final class NoiseCipherState {
// Constants for replay protection
// BCH-01-010: Use full 8-byte nonces per Noise Protocol specification
// This provides 2^64 nonce space instead of limited 2^32
private static let NONCE_SIZE_BYTES = 8
private static let NONCE_SIZE_BYTES = 4
private static let REPLAY_WINDOW_SIZE = 1024
private static let REPLAY_WINDOW_BYTES = REPLAY_WINDOW_SIZE / 8 // 128 bytes
private static let HIGH_NONCE_WARNING_THRESHOLD: UInt64 = 1_000_000_000
@@ -224,16 +222,20 @@ final class NoiseCipherState {
/// Extract nonce from combined payload <nonce><ciphertext>
/// Returns tuple of (nonce, ciphertext) or nil if invalid
/// BCH-01-010: Updated to extract full 8-byte nonce per Noise spec
private func extractNonceFromCiphertextPayload(_ combinedPayload: Data) throws -> (nonce: UInt64, ciphertext: Data)? {
guard combinedPayload.count >= Self.NONCE_SIZE_BYTES else {
return nil
}
// Extract 8-byte nonce (big-endian)
// Extract 4-byte nonce (big-endian)
let nonceData = combinedPayload.prefix(Self.NONCE_SIZE_BYTES)
let extractedNonce = nonceData.withUnsafeBytes { (bytes: UnsafeRawBufferPointer) -> UInt64 in
bytes.load(as: UInt64.self).bigEndian
let byteArray = bytes.bindMemory(to: UInt8.self)
var result: UInt64 = 0
for i in 0..<Self.NONCE_SIZE_BYTES {
result = (result << 8) | UInt64(byteArray[i])
}
return result
}
// Extract ciphertext (remaining bytes)
@@ -242,11 +244,15 @@ final class NoiseCipherState {
return (nonce: extractedNonce, ciphertext: Data(ciphertext))
}
/// Convert nonce to 8-byte array (big-endian)
/// BCH-01-010: Write full 8-byte nonce per Noise spec
/// Convert nonce to 4-byte array (big-endian)
private func nonceToBytes(_ nonce: UInt64) -> Data {
var nonceValue = nonce.bigEndian
return Data(bytes: &nonceValue, count: Self.NONCE_SIZE_BYTES)
var bytes = Data(count: Self.NONCE_SIZE_BYTES)
withUnsafeBytes(of: nonce.bigEndian) { ptr in
// Copy only the last 4 bytes from the 8-byte UInt64
let sourceBytes = ptr.bindMemory(to: UInt8.self)
bytes.replaceSubrange(0..<Self.NONCE_SIZE_BYTES, with: sourceBytes.suffix(Self.NONCE_SIZE_BYTES))
}
return bytes
}
func encrypt(plaintext: Data, associatedData: Data = Data()) throws -> Data {
@@ -257,9 +263,8 @@ final class NoiseCipherState {
// Debug logging for nonce tracking
let currentNonce = nonce
// BCH-01-010: With 8-byte nonces, we have full 2^64 nonce space
// Check against UInt64.max - 1 to prevent overflow
guard nonce < UInt64.max else {
// Check if nonce exceeds 4-byte limit (UInt32 max value)
guard nonce <= UInt64(UInt32.max) - 1 else {
throw NoiseError.nonceExceeded
}