Backport release/v6.5: backported crypto library fixes

[seidroid]

Backport of #3273 to release/v6.5.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Apr 21, 2026, 3:18 PM

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.35%. Comparing base (2b5cbbb) to head (fda0a3c).
⚠️ Report is 1 commits behind head on release/v6.5.

Files with missing lines	Patch %	Lines
sei-tendermint/crypto/ed25519/ed25519.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v6.5    #3288      +/-   ##
================================================
+ Coverage         58.33%   58.35%   +0.01%     
================================================
  Files              2091     2091              
  Lines            172983   172978       -5     
================================================
+ Hits             100916   100941      +25     
+ Misses            63044    63018      -26     
+ Partials           9023     9019       -4     

Flag	Coverage Δ
sei-chain-pr	79.17% <85.71%> (?)
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-tendermint/crypto/ed25519/json.go	68.29% <100.00%> (+0.79%)	⬆️
sei-tendermint/crypto/tmhash/hash.go	60.00% <ø> (+41.25%)	⬆️
sei-tendermint/libs/utils/require/require.go	75.00% <ø> (ø)
sei-tendermint/crypto/ed25519/ed25519.go	83.11% <83.33%> (+2.56%)	⬆️

... and 5 files with indirect coverage changes

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