[quicwg/base-drafts] Issue: Incorrect offset in sample (#3279)

slightlyfloating <notifications@github.com> Mon, 02 December 2019 19:12 UTC

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Date: Mon, 02 Dec 2019 11:12:19 -0800
From: slightlyfloating <notifications@github.com>
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Subject: [quicwg/base-drafts] Issue: Incorrect offset in sample (#3279)
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I believe the sample given in https://tools.ietf.org/html/draft-ietf-quic-tls-24#appendix-A.2
contains an incorrect offset to the packet number field,

Considering the 22-byte long header given in the sample
c3 ff000017 08 8394c8f03e515708 00 00 449e 00000002
I think the following line
header[17..20] ^= mask[1..4]
is supposed to read:
header[18..21] ^= mask[1..4]
as the 4-byte packet number (0x00000002) actually start at offset 18 (0-based) of the header.

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