Re: F38 - Which python asn1 library

[Robert Moskowitz]

From my colleagues on the IETF PKIX list were a lot of asn.1 oldtimers 
live...
> > > from pyasn1.type import univ
> > >  from pyasn1.codec.der.decoder import decode as der_decoder
> > >  from pyasn1.codec.der.encoder import encode as der_encoder
> > >  import binascii
> > >  oid = univ.ObjectIdentifier('1.3.6.1.4.1.6715.2.6.6')
> > >  s = der_encoder(oid)
> > >  print(binascii.hexlify(s))

060a2b06010401b43b020606

For this I don't need the der_decoder, only the encoder.

So I am set.  Actually since for my usage, the OID if fixed, only the 
content varies, I can just use the output above and prepend it to the 
value!  Don't have to call asn1 for every time to just get the same value!

thanks all.

On 5/7/23 10:15, stan via users wrote:
> On Sun, 7 May 2023 08:46:26 -0400
> Robert Moskowitz  wrote:
>
> from /usr/share/doc/python3-asn1/README.rst
> of the fedora package python3-asn1
> How to use Python-asn1
>
> .. note:: You can find more detailed documentation on the `Usage`_ page.
>
> .. _Usage: usage.rst
> Encoding
>
> If you want to encode data and retrieve its DER-encoded representation,
> use code such as:
>
> .. code-block:: python
>
> import asn1
>
> encoder = asn1.Encoder()
>    encoder.start()
>    encoder.write('1.2.3', asn1.Numbers.ObjectIdentifier)
>    encoded_bytes = encoder.output()
> Decoding
>
> If you want to decode ASN.1 from DER or BER encoded bytes, use code
> such as:
>
> .. code-block:: python
>
> import asn1
>
> decoder = asn1.Decoder()
>    decoder.start(encoded_bytes)
>    tag, value = decoder.read()
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