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Optimized outbound IFAC handling

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Mark Qvist 2026-08-23 22:27:53 +02:00
parent aef9e5b416
commit 7347034f9a
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1 changed files with 21 additions and 0 deletions
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21
RNS/Transport.py
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@ -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