Hi Miro,
On Sun, 21 Jul 2024 17:46:24 +0200
Miro Hrončok <mhroncok@xxxxxxxxxx> wrote:
> Hey Paul.
>
> I just tried this with pip-installed cryptography in Python 3.13 venv:
>
> >>> from cryptography.exceptions import _Reasons
> >>> from cryptography.hazmat.primitives.kdf.kbkdf import KBKDFHMAC
> >>> try:
> ... KBKDFHMAC(None, None, None, None, None, None, None, None,
> None) ... except Exception as e:
> ... ex = e
> ...
> >>> ex
> UnsupportedAlgorithm('Algorithm supplied is not a supported hash
> algorithm.')
> >>> ex._reason
> _Reasons.UNSUPPORTED_HASH
> >>> ex._reason is _Reasons.UNSUPPORTED_HASH
> True
>
>
> dnf-installed cryptography behaves the same in Rawhide mock.
>
> How can I raise the exception that has a _reason that equals but is
> not identical to _Reasons.UNSUPPORTED_HASH?
Sure way is to try rebuilding python-paramiko. The code that exhibits
this behavior is in tests/_util.py:
from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric import padding, rsa
...
def sha1_signing_unsupported():
"""
This is used to skip tests in environments where SHA-1 signing is
not supported by the backend.
"""
private_key = rsa.generate_private_key(
public_exponent=65537, key_size=2048, backend=default_backend()
)
message = b"Some dummy text"
try:
private_key.sign(
message,
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA1(),
)
return False
except UnsupportedAlgorithm as e:
return e._reason is _Reasons.UNSUPPORTED_HASH
Regards, Paul.
--
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