OBJ_FIND_SIGID_ALGS(3) | Library Functions Manual | OBJ_FIND_SIGID_ALGS(3)

# NAME

`OBJ_find_sigid_algs`, `OBJ_find_sigid_by_algs` — signature algorithm mappings

# 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);

# DESCRIPTION

`OBJ_find_sigid_algs`() looks up the signature algorithm. If it is found, the associated digest algorithm is stored in *pdigest unless pdigest is a `NULL` pointer, and the associated encryption algorithm is stored in *pencryption unless pencryption is a `NULL` pointer.

`OBJ_find_sigid_by_algs`() looks up the pair (digest, encryption). If it is found, the associated signature algorithm is stored in *psignature unless psignature is a `NULL` pointer.

# 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.

# SEE ALSO

OBJ_create(3), OBJ_nid2obj(3)

# HISTORY

These functions first appeared in OpenSSL 1.0.0 and have been available since OpenBSD 4.9.

June 9, 2025 | Debian