wip: RSA support

[lu-zero]

No description provided.

[codecov-commenter]

Codecov Report

Merging #14 (cadca8f) into main (29aca02) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
- Coverage   82.18%   82.10%   -0.08%     
==========================================
  Files          10       10              
  Lines        1061     1062       +1     
==========================================
  Hits          872      872              
- Misses        189      190       +1     

Impacted Files	Coverage Δ
src/cwt.rs	78.83% <100.00%> (-0.58%)	⬇️

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