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Ran 16 Feb 2019 08:41AM UTC

Files 10

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Committed 16 Feb 2019 08:36AM UTC coverage: 41.765% (-0.7%) from 42.503%

Job # GO111MODULE=on

Build Type

push

travis-ci

Committed by

kixelated

Commit Message

Optimize session auth tag generation

I profiled my application and crypto/hmac.New was taking 5.71% of the
total CPU time. Since the session key does not change, you can call
crypto/hmac.Reset() instead of making a new object. This reuses previous
work done for the key.

With a separate generateAuthTag function for RTP/RTCP, it's now possible
to pass in the ROC instead of appending it to the buffer. This primarily
helps DecryptRTP, as it was otherwise doing an extra append just for the
ROC.

name                 old time/op    new time/op    delta
EncryptRTP-8           2.20µs ± 5%    2.00µs ± 4%   -9.00%
EncryptRTPInPlace-8    2.20µs ± 1%    1.97µs ± 5%  -10.52%
DecryptRTP-8           2.13µs ± 3%    1.79µs ± 4%  -16.18%

name                 old alloc/op   new alloc/op   delta
EncryptRTP-8           1.23kB ± 0%    0.79kB ± 0%  -36.04%
EncryptRTPInPlace-8    1.10kB ± 0%    0.66kB ± 0%  -40.22%
DecryptRTP-8           1.17kB ± 0%    0.69kB ± 0%  -40.75%

name                 old allocs/op  new allocs/op  delta
EncryptRTP-8             11.0 ± 0%       7.0 ± 0%  -36.36%
EncryptRTPInPlace-8      10.0 ± 0%       6.0 ± 0%  -40.00%
DecryptRTP-8             12.0 ± 0%       7.0 ± 0%  -41.67%

Run Details

317 of 759 relevant lines covered (41.77%)

10.64 hits per line

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master: 41%

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