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Command: EVP_PKEY_cmp | Section: 3 | Source: OpenBSD | File: EVP_PKEY_cmp.3
EVP_PKEY_CMP(3) FreeBSD Library Functions Manual EVP_PKEY_CMP(3)
NAME
EVP_PKEY_missing_parameters, EVP_PKEY_copy_parameters,
EVP_PKEY_cmp_parameters, EVP_PKEY_cmp - public key parameter and
comparison functions
SYNOPSIS
#include <openssl/evp.h>
int
EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
int
EVP_PKEY_copy_parameters(EVP_PKEY *destination, const EVP_PKEY *source);
int
EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
int
EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);
DESCRIPTION
EVP_PKEY_missing_parameters() checks whether any public key parameters
are missing from pkey.
EVP_PKEY_copy_parameters() copies all public key parameters from the
source to the destination. If the algorithm does not use parameters, no
action occurs.
EVP_PKEY_cmp_parameters() compares the public key parameters of a and b.
This is only supported for algorithms that use parameters.
EVP_PKEY_cmp() compares the public key components of a and b. If the
algorithm uses public key parameters, it also compares the parameters.
The main purpose of the functions EVP_PKEY_missing_parameters() and
EVP_PKEY_copy_parameters() is to handle public keys in certificates where
the parameters are sometimes omitted from a public key if they are
inherited from the CA that signed it.
Since OpenSSL private keys contain public key components too, the
function EVP_PKEY_cmp() can also be used to determine if a private key
matches a public key.
RETURN VALUES
EVP_PKEY_missing_parameters() returns 1 if the public key parameters of
pkey are missing or incomplete or 0 if they are present and complete or
if the algorithm doesn't use parameters.
EVP_PKEY_copy_parameters() returns 1 for success or 0 for failure. In
particular, it fails if the key types mismatch or if the public key
parameters in the source are missing or incomplete.
EVP_PKEY_cmp_parameters() and EVP_PKEY_cmp() return 1 if the keys match,
0 if they don't match, -1 if the key types are different and -2 if the
operation is not supported.
SEE ALSO
EVP_PKEY_CTX_new(3), EVP_PKEY_keygen(3), EVP_PKEY_new(3),
X509_get_pubkey_parameters(3)
HISTORY
EVP_PKEY_missing_parameters() and EVP_PKEY_copy_parameters() first
appeared in SSLeay 0.8.0. EVP_PKEY_cmp_parameters() first appeared in
SSLeay 0.9.0. These functions have been available since OpenBSD 2.4.
EVP_PKEY_cmp() first appeared in OpenSSL 0.9.8 and has been available
since OpenBSD 4.5.
FreeBSD 14.1-RELEASE-p8 December 6, 2024 FreeBSD 14.1-RELEASE-p8