Bug report

If additional OpenSSL backends are loaded at runtime (this happens e.g. when importingPyOpenSSL), thehashlib.algorithms_available doesn't get updated for the newly available hashes.

Trivial reproducer:

>>>importctypes,hashlib>>>ctypes.CDLL("libssl.so").OSSL_PROVIDER_load(None,b"legacy")-1311283920>>>"md4"inhashlib.algorithms_availableFalse>>>hashlib.new("md4")<md4_hashlib.HASHobject @0x7f404308faf0>

Your environment

• CPython versions tested on: 3.11.0b1, 3.10.4 with1b6acaa backported, 3.9.12
• Operating system and architecture: Gentoo Linux amd64
• OpenSSL version: 3.0.3