| |
| 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 |