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[Cherry-pick FIPS 2025] Enable hybrid PQ keyshares on FIPS 4.0 branch#3038

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samuel40791765 merged 2 commits intoaws:fips-2025-09-12from
samuel40791765:fips-2025-09-12-update-4
Feb 25, 2026
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[Cherry-pick FIPS 2025] Enable hybrid PQ keyshares on FIPS 4.0 branch#3038
samuel40791765 merged 2 commits intoaws:fips-2025-09-12from
samuel40791765:fips-2025-09-12-update-4

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@samuel40791765
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Issues:

Resolves P388277972

Description of changes:

The two following commits from main are needed to enable hybrid PQ keyshares on the FIPS 4.0 branch:

These changes are outside the FIPS module and do not change the FIPS integrity hash.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

Fixes tests that assume X25519 will be negotiated and will break when
the default TLS supported group is changed to X25519MLKEM768.

Related to https://github.com/aws/aws-lc/pull/2531/files

(cherry picked from commit 4ae8467)
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Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.73%. Comparing base (59455f7) to head (a2b0442).

Files with missing lines Patch % Lines
ssl/extensions.cc 0.00% 2 Missing ⚠️
Additional details and impacted files
@@                 Coverage Diff                 @@
##           fips-2025-09-12    #3038      +/-   ##
===================================================
+ Coverage            78.70%   78.73%   +0.03%     
===================================================
  Files                  667      667              
  Lines               113057   113073      +16     
  Branches             16055    16073      +18     
===================================================
+ Hits                 88976    89032      +56     
+ Misses               23307    23268      -39     
+ Partials               774      773       -1     

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@sgmenda sgmenda self-assigned this Feb 25, 2026
@samuel40791765 samuel40791765 merged commit d6d2288 into aws:fips-2025-09-12 Feb 25, 2026
118 of 152 checks passed
@samuel40791765 samuel40791765 deleted the fips-2025-09-12-update-4 branch February 25, 2026 20:02
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6 participants