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As noticed by @nobu https://github.com/rubygems/rubygems/pull/4989#discussion_r735674633
From wikipedia: https://en.wikipedia.org/wiki/SHA-1#SHA-1_pseudocode
> append ml, the original message length in bits, as a 64-bit big-endian integer.
`Q` is native endian, so little-endian on most modern hardware.
The original code from RubyDigest reverses the bytes:
https://github.com/Solistra/ruby-digest/blob/d15f906caf09171f897efc74645c9e31373d7fd1/lib/ruby_digest.rb#L521
But that makes the code non-portable, the correct way is to directly ask
for a big-endian representation.
https://github.com/rubygems/rubygems/commit/ba2be01ea4
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