asn1_get_octet_der(3)

💖 asn1_get_octet_der(3) 💖

okay bestie, sit down, hydrate, because we're decoding DER data together and honestly? it's giving ✨main character energy✨. this little page lives in the libtasn1 manual — you know, the library that does the ASN.1 thing so you don't have to cry about it — and it's literally one function. one. and she's iconic.

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🌸 NAME 🌸

asn1_get_octet_der — it's an API function, bestie. that's the whole name. she said "my name is my job" and honestly? periodt. 💅

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✨ SYNOPSIS ✨

first things first, you gotta bring her in:

#include <libtasn1.h>

and here's the whole glow-up of a signature, exactly as written:

int asn1_get_octet_der(const unsigned char * der, int der_len, int *
ret_len, unsigned char * str, int str_size, int * str_len);

six parameters. she's high maintenance but she's worth it 🫶

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🎀 ARGUMENTS 🎀

• const unsigned char * der — the DER data you're decoding, and it's holding the OCTET SEQUENCE. she's the moment, she's the vibe, do not lose her.
• int der_len — the length of the der data you're decoding. how many bytes are we working with, bestie? that number. right there.
• int * ret_len — an output variable that gets the encoded length of the DER data. she reports back. she's the group chat screenshot. 👑
• unsigned char * str — a pre-allocated output buffer where the decoded OCTET SEQUENCE goes. pre-allocated, bestie — you gotta make that bed yourself, she is not doing it for you 😭
• int str_size — the length of that pre-allocated output buffer. know your limits, queen.
• int * str_len — another output variable, this one holding the length of the contents of the OCTET SEQUENCE. not the buffer. the contents. important distinction, no cap. 💀

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🦋 DESCRIPTION 🦋

so what does she actually do? she extracts an OCTET SEQUENCE from DER data. that's the job. that's the whole job. ate and left no crumbs.

⚠️ the plot twist you need to know: this function expects the DER data to be past the tag field — like, the length and content octets only. the tag? already handled. she doesn't want it. do not send her the tag. this is the one rule, bestie, and if you break it you're on your own 🙈

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🌈 RETURNS 🌈

she returns ASN1_SUCCESS when everything slays, or an error when it doesn't. that's it. that's the whole returns section. short, sweet, devastating. 💜

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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 like — copy her, share her, remix her, just keep the receipts. it's free, it's generous, it's giving community. 🌸

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🌟 SEE ALSO 🌟

the full documentation for libtasn1 is maintained as a Texinfo manual — yes, a whole manual, not just this little page. if the info and libtasn1 programs are properly installed at your site, this command:

info libtasn1

should give you access to the complete manual. go read it, bestie, it's the extended universe. 📚✨

as an alternative, you may obtain the manual from:

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

click it. bookmark it. it's the source. 💅

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okay that's the whole page, and honestly? she understood the assignment. go forth and decode your octet sequences, bestie — you've got this, iykyk 🦋💖✨

mwah 💋 this was brought to you by libtasn1 version 4.21.0 — she's the whole package, the moment, the icon, no cap. take care of her and she'll take care of your DER. periodt. 👑🌈💜