fix: crash with md4 hash

[alexander-akait]

No description provided.

[codecov]

Codecov Report

Merging #198 (96dc5ec) into master (097f5c3) will decrease coverage by 0.14%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #198      +/-   ##
==========================================
- Coverage   76.68%   76.53%   -0.15%     
==========================================
  Files          10       10              
  Lines         356      358       +2     
  Branches      111      112       +1     
==========================================
+ Hits          273      274       +1     
- Misses         72       73       +1     
  Partials       11       11              

Impacted Files	Coverage Δ
lib/getHashDigest.js	89.06% <50.00%> (-1.27%)	⬇️

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