Hubert Kario wrote in https://bugzilla.redhat.com/show_bug.cgi?id=2054702

Description of problem:
The hashlib.algorithms_available set includes algorithms like ripemd160 and whirlpool, those algorithms are not usable unless openssl legacy provider is loaded. Since it's not loaded, and the hashlib module won't load it, any attempt to use them fails.

Version-Release number of selected component (if applicable):
python3-3.9.10-1.el9.x86_64
openssl-3.0.1-5.el9.x86_64

How reproducible:
always

Steps to Reproduce:
0. start python3

1. from hashlib import algorithms_available
2. algorithms_available
3. import hashlib
4. a = {(name, hashlib.new(name).digest_size) for name in algorithms_available}

Actual results:
{'sha3_384', 'blake2s', 'sha384', 'sha512_224', 'md5', 'sha3_512', 'md5-sha1', 'sha3_256', 'shake_128', 'sm3', 'sha256', 'sha512', 'sha1', 'shake_256', 'blake2b', 'whirlpool', 'sha512_256', 'sha3_224', 'sha224', 'ripemd160', 'md4'}

Traceback (most recent call last):
  File "/usr/lib64/python3.9/hashlib.py", line 164, in __hash_new
    return _hashlib.new(name, data, **kwargs)
ValueError: [digital envelope routines] unsupported

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in <setcomp>
  File "/usr/lib64/python3.9/hashlib.py", line 170, in __hash_new
    return __get_builtin_constructor(name)(data)
  File "/usr/lib64/python3.9/hashlib.py", line 127, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type whirlpool

Expected results:
{'sha3_384', 'blake2s', 'sha384', 'sha512_224', 'md5', 'sha3_512', 'md5-sha1', 'sha3_256', 'shake_128', 'sm3', 'sha256', 'sha512', 'sha1', 'shake_256', 'blake2b', 'sha512_256', 'sha3_224', 'sha224'}

{('blake2b', 64), ('sha512', 64), ('md5-sha1', 36), ('sha3_512', 64), ('md5', 16), ('sha224', 28), ('shake_128', 0), ('sm3', 32), ('blake2s', 32), ('sha1', 20), ('shake_256', 0), ('sha512_256', 32), ('sha3_224', 28), ('sha3_256', 32), ('sha3_384', 48), ('sha384', 48), ('sha256', 32), ('sha512_224', 28)}

Additional info:
If the legacy provider is loaded, then the algorithms should be listed and should work.

It may be caused by Python using the deprecated EVP_MD_do_all() method instead of the EVP_MD_do_all_provided() method

Hubert's suggested solution EVP_MD_do_all_provided() worked almost straight forward. The function signature is a bit different and I got "undefined" in the result set. Filtering out NID_undef got right of it.

New changeset 48e2010 by Christian Heimes in branch 'main':
bpo-47101: list only activated algorithms in hashlib.algorithms_available (GH-32076)
48e2010

New changeset ec3589f by Miss Islington (bot) in branch '3.9':
bpo-47101: list only activated algorithms in hashlib.algorithms_available (GH-32076)
ec3589f

New changeset 1b6acaa by Christian Heimes in branch '3.10':
[3.10] bpo-47101: list only activated algorithms in hashlib.algorithms_available (GH-32076) (GH-32085)
1b6acaa

@tiran: It looks like this has been fixed: should the issue be closed?

It looks like this has been fixed: should the issue be closed?

Hashlib still needs to load the legacy provider to achieve parity with 1.1.1 builds, but that's tracked in #92876.