On 5/5/23 22:51, Samuel Sieb wrote:
On 5/5/23 13:01, Robert Moskowitz wrote:
What my colleague said, see below.
On 5/5/23 15:35, Jonathan Billings wrote:
On May 5, 2023, at 14:40, Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> wrote:
A colleague sent me a python script that does asn1 encoding. It
starts with:
import asn1
then after a few
asn1_enc.write(oid, asn1.Numbers.ObjectIdentifier)
There's no way that would work without something else being involved.
You only imported "asn1". That can't give you something called
"asn1_enc", so you're not showing enough for us to help you.
That is all my colleague has indicated he is doing. He can only
generally advise me as we are working on the same IETF standard, but
behind different contract setups.
asn1 encoding is a standard part of any asn1 package. That and
decoding, so something like asn1_enc object has to be available.
It seems pyasn1 is already installed. It does not provide asn1_enc.
python3-pyasn1 is the only Python asn1 library available. It provides
a package called "pyasn1" that you can import.
# dnf list > dnf.lst
# grep asn1 dnf.lst |grep -i python
python3-pyasn1.noarch 0.4.8-12.fc38 @fedora
python3-pyasn1-modules.noarch 0.4.8-12.fc38 @fedora
python-asn1-doc.noarch 2.6.0-2.fc38 fedora
python-pyasn1-doc.noarch 0.4.8-12.fc38 fedora
python3-asn1.noarch 2.6.0-2.fc38 fedora
python3-asn1crypto.noarch 1.5.1-4.fc38
-----------------
python3-pyasn1 was installed already. python-asn1 was not. Don't know
about python3-asn1crypto.
I am pretty sure this is just old or broken code. According to the
documentation:
https://python-asn1.readthedocs.io/en/latest/usage.html
… you would just create a new asn1.Encoder() object and use that to
write(). Perhaps “asn1_enc” is defined that way in the code?
I think this isn’t really a Fedora issue, unless the API changes in
F38, in which case, it’s time to update the code, or pin your
requirements to an older version of asn1.
He is actively doing this. I believe he uses Ubuntu.
asn1 is a 3^rd party package that I installed from pip under the name
pyasn1 IIRC. You would import it in your code using:
The README for python3-pyasn1 says that it is the one that you would
get from "pip install pyasn1" so it should be the right one.
thanks
import asn1
The import is "pyasn1" in Fedora as it should be, but that still won't
get you the thing you're looking for, so you need to provide some more
lines of the code to see where that's coming from.
asn1 is a 3rd party package that I installed from pip under the name
pyasn1 IIRC. You would import it in your code using:
import asn1
I created the OID as a string ("1.3.6.1.4.1.6715.2.6.blah") and passed
it into the asn1 Encoders write function like this:
asn1_enc.write(oid, asn1.Numbers.ObjectIdentifier)
oid_bytes = asn1_enc.output()
Then I just combined it all together with the bytes of the Endorsement.
base64.b64encode(len(oid_bytes).to_bytes(1, 'little') + oid_bytes +
endorsement_bytes).decode('ascii')
---------
That is probably all he can tell me.
So I got more research to do, as in the end, we have to interoperate.
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