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Hopefully, like BLAKE2 it makes it into OpenSSL.

One thing I was wondering about, OpenSSL 1.3 dropped support for SSL compression. Would that mean the compression function in BLAKE2 and future BLAKE3 integration couldn't be used or is this a different layer? https://en.wikipedia.org/wiki/BLAKE_(hash_function)

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The compression function in a hash function has nothing to do with the general data compression that TLS got rid of; it's a component of the hash that takes n bits and outputs less than n bits in an as unstructured manner as possible.

It won't be added to OpenSSL until it's standardized (see [1]). However there's an external provider available of somewhat dubious quality that adds support for it ([2]).

[1] https://github.com/openssl/openssl/issues/11613#issuecomment...

[2] https://github.com/J-Montgomery/blake3-prov

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