Support curve25519 tentatively

[kigawas]

Closes #183

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b8634ae) 100.00% compared to head (a2afed5) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #732   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           11        11           
  Lines          349       447   +98     
  Branches        98       133   +35     
=========================================
+ Hits           349       447   +98     

Files Changed	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/keys/index.ts	100.00% <100.00%> (ø)
src/utils/compat.ts	100.00% <100.00%> (ø)
src/utils/elliptic.ts	100.00% <100.00%> (ø)

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