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From: Manuel Gomez <mgrojo@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: ASN.1 to Ada?
Date: Wed, 22 May 2013 22:31:19 +0200
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On 22/05/13 00:43, Diogenes wrote:
> Are there any Open Source ASN.1 to Ada compilers out there?
>
> Or do I need to do the odious task myself?
>
> Thanks for any pointers.
>

Have you looked at this? It seems to meet your requirements, but I 
haven't used it myself:

http://taste.tuxfamily.org/wiki/index.php?title=ASN.1_generators