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Commit 7347034f9a531ea08e683b0b2d0e9e76bd3e71e1

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Parents : aef9e5b

Author : Mark Qvist <bc7291552be7a58f361522990465165c>

Signature : T66BB85Valid, signed by author

Date : 2026-08-23T22:27:53+02:00

Optimized outbound IFAC handling

Changes

1 files changed, 21 insertions(+), 0 deletions(-)

M RNS/Transport.py +21

Diff

diff --git a/RNS/Transport.py b/RNS/Transport.py

index 3143047d..3160985e 100755

--- a/RNS/Transport.py

+++ b/RNS/Transport.py

@@ -1257,6 +1257,27 @@ class Transport:

def handle_outgoing_announces(outgoing):

for packet in sorted(outgoing, key=lambda p: p.hops): packet.send()

+ @staticmethod

+ def handle_outgoing_ifac(interface, raw):

+ # Calculate packet access code

+ ifac_size = interface.ifac_size

+ ifac = interface.ifac_identity.sign(raw)[-ifac_size:]

+ # Generate mask

+ mask = RNS.Cryptography.hkdf(length=len(raw) + ifac_size, derive_from=ifac,

+ salt=interface.ifac_key, context=None)

+ # Set IFAC flag and assemble new payload with IFAC

+ new_raw = bytes([raw[0] | 0x80, raw[1]]) + ifac + raw[2:]

+ # Mask header bytes and payload with a single bignum XOR, leaving

+ # the IFAC itself untouched, then ensure the IFAC flag is set.

+ n = len(new_raw)

+ x = int.from_bytes(new_raw, "big") ^ int.from_bytes(mask, "big")

+ if ifac_size: x ^= int.from_bytes(mask[2:2 + ifac_size], "big") << (8 * (n - 2 - ifac_size))

+ x |= 1 << (8 * n - 1)

+ return x.to_bytes(n, "big")

@staticmethod

def handle_outgoing_ifac_legacy(interface, raw):

# Calculate packet access code