Alternative for blake2b on systems that do not support that hash function?

[VlkrS]

blake2b is not supported on all platforms that can run Erlang, i.e. those building with LibreSSL rather than OpenSSL.

Would it be possible to fall back to a different hash or even a checksum for that purpose? As far as I understand this is only needed to detect changes for recompilation and actually requires none of the security properties of a cryptographic hash?

elixir/lib/mix/lib/mix/compilers/elixir.ex

Line 454 in 7c1cc52

8 -> :crypto.hash(:blake2b, contents)

[josevalim]

What error do you get in those cases?

[VlkrS]

** (ErlangError) Erlang error: {:notsup, {~c"hash.c", 112}, ~c"Digest type not supported in this cryptolib"}

in Mix.Tasks.DepsTest - patching those lines to use :sha256 works.