Add configuration & refactor utils

[kigawas]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8ebcc80) 100.00% compared to head (590632c) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #724   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6        10    +4     
  Lines          169       262   +93     
  Branches        47        74   +27     
=========================================
+ Hits           169       262   +93     

Impacted Files	Coverage Δ
src/config.ts	100.00% <100.00%> (ø)
src/consts.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/keys/PrivateKey.ts	100.00% <100.00%> (ø)
src/keys/PublicKey.ts	100.00% <100.00%> (ø)
src/utils/elliptic.ts	100.00% <100.00%> (ø)
src/utils/hex.ts	100.00% <100.00%> (ø)
src/utils/index.ts	100.00% <100.00%> (ø)
src/utils/symmetric.ts	100.00% <100.00%> (ø)

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