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Q: Your compiler supplies a der_encode() procedure. How do I encode BER?
A:
The DER (and CER) are stricter subsets of a more generic BER encoding
method. If you encode data with DER or CER, all BER-conformant decoders
will easily understand that. Hence, to encode data in the BER format,
simply use the DER encoder, der_encode().
See also: ISO/IEC 8825-1 / X.690:
"ASN.1 encoding rules: Specification of
Basic Encoding Rules (BER),
Canonical Encoding Rules (CER) and
Distinguished Encoding Rules (DER)"
Q: I've tried doing ./asn1c/asn1c -P examples/*PKIX*93*, but compiler spits
several fatal failures and exits.
A:
The PKIX1 specifications uses ASN.1 Information Object Classes,
which is arguably one of the most complex ASN.1 concepts.
The asn1c parser and fixer subsystems currently understand most of
IOC syntax, but the compiler can cope with only the very basic
IOC semantics.
The goal of asn1c is to adequately support the practically necessary
subset of IOCs to compile PKIX1 and other real-world specs,
but this milestone isn't yet reached. Please contact me in case
you have special requirements, we can work it out.
P.S. Parser and fixer are now able to grok PKIX1, try this out:
./asn1c/asn1c -E -F examples/*PKIX*93*
--
Lev Walkin
vlm@lionet.info
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