asn1_der_decoding(3)

✨ asn1_der_decoding ✨

okay bestie, buckle up, because we're doing libtasn1 today and this one is a bop 💅 it's asn1_der_decoding(3), and no, you cannot skip it, it's literally the moment where your cute little empty ASN1 skeleton gets its whole personality filled in 🦋

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🌸 SYNOPSIS 🌸

#include <libtasn1.h>

int asn1_der_decoding(asn1_node * element, const void * ider, int
ider_len, char * errorDescription);

like. that's it. that's the whole function. iconic behavior honestly 🎀

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💖 ARGUMENTS 💖

• asn1_node * element — a pointer to an ASN1 structure. that's your girl, your main character, the one getting filled up ✨
• const void * ider — the vector that contains the DER encoding. the raw material, the ingredients, the slay 🧚
• int ider_len — how many bytes live in * ider, specifically ider[0]..ider[len-1]. count them, bestie, don't guess 🔥
• char * errorDescription — a null-terminated string that carries the details when something goes wrong. it's giving supportive friend who tells you exactly what happened 😭

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🌈 DESCRIPTION 🌈

so what does it DO. okay so: it fills the structure * element with the values of a DER encoding string. that's the whole job. it's giving "here's a box, here's the stuff, put the stuff in the box" 📦✨

BUT. and this is important, bestie, i need you to hear me. the structure must just be created with the function asn1_create_element(). freshly created. brand new. don't come in here with a half-used structure, that's not the vibe 🚫

also, note that the * element variable is provided as a pointer for historical reasons. yeah. it's a legacy thing. it's giving ancient family heirloom. we don't question it, we just respect it 🫶

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💀 RETURNS 💀

• ASN1_SUCCESS — DER encoding is OK, we ate, periodt 👑
• ASN1_ELEMENT_NOT_FOUND — if ELEMENT is NULL. bestie. you passed nothing. there's nothing there 🙈
• ASN1_TAG_ERROR or ASN1_DER_ERROR — if the der encoding doesn't match the structure name. and heads up, * ELEMENT gets deleted in this case. gone. deleted. not me losing the whole structure 💀

real talk though: those last two are a package deal. mismatch = ASN1_TAG_ERROR or ASN1_DER_ERROR, and your * ELEMENT is getting deleted. it's a warning, not a suggestion. lowkey tragic but highkey correct ✨

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🎀 COPYRIGHT 🎀

Copyright © 2006-2025 Free Software Foundation, Inc..

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

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🦋 SEE ALSO 🦋

the full documentation for libtasn1 is maintained as a Texinfo manual. if the info and libtasn1 programs are properly installed at your site, the command

info libtasn1

should give you access to the complete manual. as an alternative you may obtain the manual from:

https://www.gnu.org/software/libtasn1/manual/

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and that's the tea 🍓 this was asn1_der_decoding(3) from libtasn1 version 4.21.0 — go read the docs, hydrate, and go decode something gorgeous 💜✨