Add support for PEM encoded private key in RSA and SEC1 Elliptic Curv…

[minlux]

…e format

[gftea]

Thanks for PR, can you add unit tests for all 3 key types?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.76%. Comparing base (17d7107) to head (521bdd7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #137      +/-   ##
==========================================
+ Coverage   86.46%   86.76%   +0.29%     
==========================================
  Files          40       40              
  Lines        6317     6459     +142     
==========================================
+ Hits         5462     5604     +142     
  Misses        855      855              

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[gftea]

thanks @minlux