handshake: embed the mask as an array into the aesHeaderProtector

[marten-seemann]

Part of #3663.

InitialAEADCreate-16                 4.78µs ± 5%    4.75µs ± 4%    ~     (p=0.631 n=10+10)
InitialAEAD/opening_100_bytes-16      116ns ± 2%     116ns ± 2%    ~     (p=0.846 n=8+10)
InitialAEAD/opening_1200_bytes-16     207ns ± 1%     209ns ± 2%    ~     (p=0.137 n=10+10)
InitialAEAD/sealing_100_bytes-16      111ns ± 3%     113ns ± 4%  +2.05%  (p=0.037 n=9+10)
InitialAEAD/sealing_1200_bytes-16     206ns ± 2%     206ns ± 3%    ~     (p=0.739 n=10+10)

name                               old alloc/op   new alloc/op   delta
InitialAEADCreate-16                 10.5kB ± 0%    10.4kB ± 0%  -0.31%  (p=0.000 n=10+10)
InitialAEAD/opening_100_bytes-16      0.00B          0.00B         ~     (all equal)
InitialAEAD/opening_1200_bytes-16     0.00B          0.00B         ~     (all equal)
InitialAEAD/sealing_100_bytes-16      0.00B          0.00B         ~     (all equal)
InitialAEAD/sealing_1200_bytes-16     0.00B          0.00B         ~     (all equal)

name                               old allocs/op  new allocs/op  delta
InitialAEADCreate-16                    131 ± 0%       129 ± 0%  -1.53%  (p=0.000 n=10+10)
InitialAEAD/opening_100_bytes-16       0.00           0.00         ~     (all equal)
InitialAEAD/opening_1200_bytes-16      0.00           0.00         ~     (all equal)
InitialAEAD/sealing_100_bytes-16       0.00           0.00         ~     (all equal)
InitialAEAD/sealing_1200_bytes-16      0.00           0.00         ~     (all equal)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (02e4506) 84.75% compared to head (abf359a) 84.78%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4324      +/-   ##
==========================================
+ Coverage   84.75%   84.78%   +0.03%     
==========================================
  Files         150      150              
  Lines       14250    14287      +37     
==========================================
+ Hits        12077    12113      +36     
  Misses       1675     1675              
- Partials      498      499       +1     

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