test_hashlib blake2 tests fail on python configured --without-builtin-hashlib-hashes #145028
Description
Bug report
Bug description:
Issue
test_hashlib fails on cpython configured --without-builtin-hashlib-hashes due to missing blake2 implementation.
The same happens if it was built with a subset of --with-builtin-hashlib-hashes that excludes blake2.
It seems that, because blake2 is not provided by the underlying openssl provider nor the builtin implementation due to configure flag, hashlib tests invoking exposed blake2* placeholders raise ValueError.
ERROR: test_algorithms_available (Lib.test.test_hashlib.HashLibTestCase.test_algorithms_available)
ERROR: test_blake2_update_over_4gb (Lib.test.test_hashlib.HashLibTestCase.test_blake2_update_over_4gb)
ERROR: test_clinic_signature (Lib.test.test_hashlib.HashLibTestCase.test_clinic_signature) [blake2s]
ERROR: test_clinic_signature (Lib.test.test_hashlib.HashLibTestCase.test_clinic_signature)
ERROR: test_clinic_signature_errors (Lib.test.test_hashlib.HashLibTestCase.test_clinic_signature_errors)
ERROR: test_copy (Lib.test.test_hashlib.HashLibTestCase.test_copy)
ERROR: test_gil (Lib.test.test_hashlib.HashLibTestCase.test_gil)
ERROR: test_hash_array (Lib.test.test_hashlib.HashLibTestCase.test_hash_array)
ERROR: test_hexdigest (Lib.test.test_hashlib.HashLibTestCase.test_hexdigest)
ERROR: test_large_update (Lib.test.test_hashlib.HashLibTestCase.test_large_update)
ERROR: test_name_attribute (Lib.test.test_hashlib.HashLibTestCase.test_name_attribute)
ERROR: test_threaded_hashing_fast (Lib.test.test_hashlib.HashLibTestCase.test_threaded_hashing_fast) [blake2s]
ERROR: test_threaded_hashing_slow (Lib.test.test_hashlib.HashLibTestCase.test_threaded_hashing_slow) [blake2s] (is_shake=False)
ERROR: test_threaded_hashing_slow (Lib.test.test_hashlib.HashLibTestCase.test_threaded_hashing_slow) [do_test_algorithm_via_hashlib_new_blake2s] (is_shake=False)
ERROR: test_threaded_hashing_slow (Lib.test.test_hashlib.HashLibTestCase.test_threaded_hashing_slow) [blake2b] (is_shake=False)
ERROR: test_threaded_hashing_slow (Lib.test.test_hashlib.HashLibTestCase.test_threaded_hashing_slow) [do_test_algorithm_via_hashlib_new_blake2b] (is_shake=False)
ERROR: test_usedforsecurity_false (Lib.test.test_hashlib.HashLibTestCase.test_usedforsecurity_false)
ERROR: test_usedforsecurity_true (Lib.test.test_hashlib.HashLibTestCase.test_usedforsecurity_true)
----------------------------------------------------------------------
Ran 82 tests in 7.012s
FAILED (errors=18, skipped=26)
Steps to reproduce
./configure --without-builtin-hashlib-hashes
make
# run isolated failure after make:
./python -m unittest Lib.test.test_hashlib.HashLibTestCase
Suggested fix
I believe this to require a test-only fix.
test_hashlib already seems to have many guards for _blake2 module after conditional import checks.
It just seems there's a few more places that really assume blake2 variants are present, which may not be true.
I'm happy to provide a pull request for those changes.
CPython versions tested on:
CPython main branch, 3.14
Operating systems tested on:
Linux, macOS