D2I_PKEY_USAGE_PERIOD(3)

📦 version 4.4.0, in alpine 3.24, arch rolling

✨ D2I_PKEY_USAGE_PERIOD(3) ✨

okay so bestie, this is a page from the Library Functions Manual and it's all about the d2i_PKEY_USAGE_PERIOD and i2d_PKEY_USAGE_PERIOD girlies — the decode/encode duo for X.509 key usage period extensions 💅

🌸 NAME 🌸

d2i_PKEY_USAGE_PERIOD, i2d_PKEY_USAGE_PERIOD — decode and encode X.509 key usage period extensions 🎀

🦋 SYNOPSIS 🦋

like, first you gotta bring in the library — it's libcrypto:

#include <openssl/x509v3.h>

then the decoding icon herself:

PKEY_USAGE_PERIOD *
d2i_PKEY_USAGE_PERIOD(PKEY_USAGE_PERIOD **val_out,
    const unsigned char **der_in, long length);

and her encoding bestie:

int
i2d_PKEY_USAGE_PERIOD(PKEY_USAGE_PERIOD *val_in,
    unsigned char **der_out);

💖 DESCRIPTION 💖

so d2i_PKEY_USAGE_PERIOD() and i2d_PKEY_USAGE_PERIOD() decode and encode an ASN.1 PrivateKeyUsagePeriod structure — and this structure is literally defined in RFC 3280 section 4.2.1.4, no cap 📜

ngl, if you want the details about the semantics, examples, caveats, and bugs, the page is like "go read ASN1_item_d2i(3)" — that's where all the lore lives ✨

🔥 RETURN VALUES 🔥

  • d2i_PKEY_USAGE_PERIOD() — returns a PKEY_USAGE_PERIOD object, or NULL if an error occurs 😭
  • i2d_PKEY_USAGE_PERIOD() — returns the number of bytes successfully encoded, or a negative value if an error occurs 💀

👑 SEE ALSO 👑

go give them a read, iykyk 🫶

🌈 STANDARDS 🌈

⭐ HISTORY ⭐

d2i_PKEY_USAGE_PERIOD() and i2d_PKEY_USAGE_PERIOD() first appeared in OpenSSL 0.9.2b and have been available since OpenBSD 2.6 — vintage icons fr fr 🧚

okay that's the whole page bestie, you ate that 💅 this cutie was served up by Debian on June 8, 2025 — go forth and decode responsibly, mwah 🎀✨

📦 where this page comes from