OBJ_FIND_SIGID_ALGS(3)

💖 NAME 💖

okay so bestie, welcome to OBJ_FIND_SIGID_ALGS(3) straight out of the Library Functions Manual 🎀 — and today's main characters are OBJ_find_sigid_algs and OBJ_find_sigid_by_algs, aka your signature algorithm mappings ✨ iykyk.

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🦋 SYNOPSIS 🦋

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

int
OBJ_find_sigid_algs(int signature, int *pdigest, int *pencryption);

int
OBJ_find_sigid_by_algs(int *psignature, int digest, int encryption);

like, literally just include the header and you're in 💅

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🌸 DESCRIPTION 🌸

💫 OBJ_find_sigid_algs()

this one goes looking for the signature algorithm 👑 and if it finds it:

• the matching digest algorithm gets dropped into *pdigest — unless pdigest is a NULL pointer, in which case bestie, we simply don't 🫶
• the matching encryption algorithm gets dropped into *pencryption — unless pencryption is a NULL pointer, same deal, no stress 💜

💫 OBJ_find_sigid_by_algs()

this one runs the lookup the other way around, hunting for the pair (digest, encryption) 🔍 and if that pair is found, the associated signature algorithm goes into *psignature — unless psignature is a NULL pointer, in which case it's giving "we move" 😌✨

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🎀 RETURN VALUES 🎀

• OBJ_find_sigid_algs() — returns 1 if a definition of the signature algorithm is found, or 0 if a definition of the signature algorithm is not built into the library 😭
• OBJ_find_sigid_by_algs() — returns 1 if a signature algorithm using the specified digest and encryption algorithms is defined, or 0 if the definition of such an algorithm is not built into the library 💀

fr fr, 0 is not an error message situation, it just means that definition isn't baked in. vibe check passed, lookup not found 🙈

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⭐ SEE ALSO ⭐

• OBJ_create(3)
• OBJ_nid2obj(3)

go read these next, they're iconic 👑

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🌈 HISTORY 🌈

these functions first appeared in OpenSSL 1.0.0 and have been available since OpenBSD 4.9 — so they've been serving looks for a minute 💅✨

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mwah 🫶 this lil page is from Debian, dated June 9, 2025, and it lives in section 3 (OBJ_FIND_SIGID_ALGS(3)) — periodt. 💖