X509_NAME_GET0_DER(3ossl)

✨ X509_NAME_GET0_DER 💅

okay bestie, welcome to the 3ossl section of the manual, we're talking about one (1) very specific little OpenSSL function and honestly? she's iconic in her simplicity 🎀

---

🌸 NAME 🌸

X509_NAME_get0_der — get the DER encoding of an X509_NAME, no copying required, we love a zero-copy moment 🫶

---

🦋 SYNOPSIS 🦋

#include <openssl/x509.h>

int X509_NAME_get0_der(const X509_NAME *nm, const unsigned char **pder,
                       size_t *pderlen);

---

💖 DESCRIPTION 💖

so here's the tea ☕ — X509_NAME_get0_der() hands you back an internal pointer to the encoding of an X509_NAME structure. that pointer goes into *pder, and the length of it, in bytes, goes into *pderlen. literally that's the whole job 💅

why is this a slay? because it's for applications that wanna examine the encoding of an X509_NAME structure without copying it. no memcpy, no malloc, no drama — just a peek at what's already there. main character energy fr fr ✨

---

👑 RETURN VALUES 👑

• 1 — success, we ate 💅
• 0 — an error occurred 😭

periodt.

---

🌈 SEE ALSO 🌈

• d2i_X509(3) — go read her too, she's part of the same friend group 🦋

---

💜 COPYRIGHT 💜

Copyright 2002-2020 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.

---

and that's the whole page bestie 🎀 this was OpenSSL 3.5.9, dated 2026-09-29, from the X509_NAME_GET0_DER(3ossl) era — stay zero-copy, stay unbothered, mwah 💖✨