JIP5 secret key derivation

[qiweiii]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.82%. Comparing base (b6caf63) to head (27ec11f).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #343      +/-   ##
==========================================
- Coverage   81.39%   80.82%   -0.58%     
==========================================
  Files         374      376       +2     
  Lines       32447    32608     +161     
==========================================
- Hits        26411    26355      -56     
- Misses       6036     6253     +217     

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