asn1_encode_simple_der(3)

💖 asn1_encode_simple_der(3) — the libtasn1 glow-up you didn't know you needed 💖

okay bestie, sit down, hydrate, and let me tell you about asn1_encode_simple_der, an API function from libtasn1 that is lowkey doing the most for DER encoding. it's giving tiny-but-mighty. it's giving main character. let's get into it ✨

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🌸 NAME 🌸

asn1_encode_simple_der — literally just an API function, that's the whole vibe 🫶

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✨ SYNOPSIS ✨

#include <libtasn1.h>

int asn1_encode_simple_der(unsigned int etype, const unsigned char *
str, unsigned int str_len, unsigned char * tl, unsigned int * tl_len);

yes the line break in the middle of the params is just how it is, don't come for me, that's the source fr fr 😭

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🎀 ARGUMENTS 🎀

• unsigned int etype — the type of the string you're encoding, from the ASN1_ETYPE_ family. pick your fighter 💅
• const unsigned char * str — the string data itself. the moment. the content. 👑
• unsigned int str_len — how long that string is, bestie. gotta know the length, no cap.
• unsigned char * tl — the encoded tag and length go in here. this is the output slot, she's important 💖
• unsigned int * tl_len — the bytes of the tl field. (that's what the manpage says, verbatim energy, so yes: "the bytes of the tl field") 🦋

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🌈 DESCRIPTION 🌈

so what does she do? she creates the DER encoding for various simple ASN.1 types — strings and that whole situation, etc. 🧚

she stores the tag and length in tl, and listen, tl should have space for at least ASN1_MAX_TL_SIZE bytes. do not skimp on the buffer, bestie, that's not the moment to be frugal 🙈

initially, tl_len should contain the size of tl. so you tell her how much room she's got before she starts writing. communicate! it's healthy! 💜

and here's the iconic part: the complete DER encoding should consist of the value in tl appended with the provided str. so like, tl + str = the whole look. periodt. ⭐

ngl this is the kind of function where you either read the docs or you learn the hard way, and one of those paths is significantly cuter than the other 💀

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🔥 RETURNS 🔥

ASN1_SUCCESS if everything slayed, or an error value if it did not. that's it, that's the return. no mystery, no drama (well, maybe a little drama if it errors) 😭

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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. (so yes, you may absolutely redistribute this, just keep the receipts, queen 🎀)

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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. and if info isn't giving, as an alternative you may obtain the manual from:

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

go forth and read, bestie, the lore is deep and the lore is free 📚💖

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and that's the whole page, mwah 💅 — this was libtasn1, version 4.21.0, and the page you just read is asn1_encode_simple_der(3). stay encoded, stay iconic, and remember: ASN1_MAX_TL_SIZE bytes minimum. iykyk 🦋✨