Re: [quicwg/base-drafts] First octet changes (#2006)

[MikkelFJ <[e-mail]>]

mikkelfj commented on this pull request.



> +protection only differs in the order in which the packet number length
+(pn_length) is determined.
+
+~~~
+mask = header_protection(hp_key, sample)
+
+pn_length = (packet[0] & 0x03) + 1
+if packet[0] & 0x80 == 0x80:
+   # Long header: 4 bits masked
+   packet[0] ^= mask[0] & 0x0f
+else:
+   # Short header: 5 bits masked
+   packet[0] ^= mask[0] & 0x1f
+
+# pn_offset is the start of the Packet Number field.
+packet[pn_offset:pn_offset+pn_length] ^= mask[1:1+pn_length]

but ^ isn't ambiguous to those who know about it (which is like everyone)

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