Any plans to add ASN.1 PER support?

[David Wahlstedt]

Hello,

I wonder if there are any plans to add PER encoding/decoding support for ASN.1?

I have looked around, and it seems that there isn't any project supporting this, currently.

Best regards

David

[Pat Farrell]

On Thursday, January 11, 2018 at 10:50:24 AM UTC-5, David Wahlstedt wrote:

I wonder if there are any plans to add PER encoding/decoding support for ASN.1?

I have looked around, and it seems that there isn't any project supporting this, currently.

Wow, I haven't heard anyone ask for ASN.1 PER or DER in two decades.

I know it still is listed in the specs, but  ASN.1 was  worse than XML

[David Wahlstedt]

ASN.1 is still alive and present in telecom applications. The PER encoding is missing in the go library, unfortunately...

[Matt Harden]

It isn't something that is likely to be added to the stdlib. If anything, a library like https://github.com/Logicalis/asn1 might be interested in supporting it / accepting a pull request to add it.

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[David Wahlstedt]

Thanks!

[David Wahlstedt]

There is also the following repo, that uses parser generators a la yacc/lex to parse ASN.1 specifications and build abstract syntax trees of those, from which the encoder/coder code can be generated.

https://github.com/chemikadze/asn1go

Any arguments which one to prefer?

Spontaneously I prefer the link I gave above, since it looks natural to first produce an AST from the given ASN.1 spec, and then proceed from there. I don't see this in the other repo(Logicalis/asn1), but maybe it is there implicitly somehow, although I don't realize it? (I am new to golang, and I have looked deep into this)

/David

Den lördag 27 januari 2018 kl. 20:02:18 UTC+1 skrev Matt Harden:

[David Wahlstedt]

Correction of my comment: "looked deep into this" -> "not looked deeply into this" ;-)

[andrey mirtchovski]

didn't reply to list, sorry:

> https://github.com/chemikadze/asn1go

i gave it a try. it's a good start (we use asn1c heavily, asn1go is a
good match for our use case) but there seems to be a lot missing.
including a license. i created an issue for that.

it failed to parse our asn.1 on some technicalities (such as "-----"
being a valid comment line) and when those were fixed, it turned out
it doesn't implement CHOICE, as well as other things :(

a good project to put effort behind as it seems the most all-encompassing.

also, have you thought about asn1c and cgo? it is doable, if you know your C :)