PKCS7_GET_SIGNER_INFO(3)

📦 version 4.4.0, in alpine 3.24, arch rolling

💅 PKCS7_GET_SIGNER_INFO 💅

okay bestie, so we're in the <openssl/pkcs7.h>-iverse again, and this one lives in the libcrypto library — she's a whole manual page in the Library Functions Manual section, and honestly? iconic behavior from her.

✨ NAME ✨

PKCS7_get_signer_info — the girl whose entire job is retrieving signerInfos out of a SignedData object. that's it. that's the gig. 🎀

🫶 SYNOPSIS 🫶

first up, you gotta bring the library and the header along, no cap:

library “libcrypto”
#include <openssl/pkcs7.h>

then the function herself:

STACK_OF(PKCS7_SIGNER_INFO) *
PKCS7_get_signer_info(PKCS7 *p7);

she takes one PKCS7 *p7 and hands you back a STACK_OF(PKCS7_SIGNER_INFO) *. simple. clean. main character energy. ✨

🌸 DESCRIPTION 🌸

so what does she actually do? she reaches into p7 and pulls out the set of SignerInfo structures sitting in the signerInfos field. literally just grabbing them for you. 💖

and once you have them? you can manipulate them with the functions documented over in PKCS7_add_attribute(3). the way that's your next stop, iykyk. 🦋

🔥 RETURN VALUES 🔥

she returns an internal pointer to a STACK_OF(PKCS7_SIGNER_INFO) object — note that word internal, bestie, she's not making you a fresh copy, she's handing you the house keys 🏠 — or NULL on failure.

and she fails when:

  • p7 is NULL 😭
  • it has no content 💀
  • it's of a type other than SignedData or SignedAndEnvelopedData 🙈

so yeah, vibe check your p7 before you come for her. ⭐

👑 SEE ALSO 👑

go read these, they're all part of the same friend group:

🌈 HISTORY 🌈

PKCS7_get_signer_info() first appeared in SSLeay 0.8.1 and has been available since OpenBSD 2.4. an elder. a legend. she's been serving since before most of us could read. 👑

okay that's the whole page, periodt. 💅 this cutie is brought to you by the Debian edition, dated June 8, 2025 — go drink some water and go call your PKCS7 functions responsibly, bestie 🫶💜

📦 where this page comes from