EVP_PKEY_cmp - EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, public key parameter and comparison functions
#include <openssl/evp.h> int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey); int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from); 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);
EVP_PKEY_cmp(3openssl) OpenSSL EVP_PKEY_cmp(3openssl)
NAME
EVP_PKEY_copy_parameters, EVP_PKEY_missing_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 *to, const EVP_PKEY *from);
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
The function EVP_PKEY_missing_parameters() returns 1 if the public key
parameters of pkey are missing and 0 if they are present or the
algorithm doesn't use parameters.
The function EVP_PKEY_copy_parameters() copies the parameters from key
from to key to. An error is returned if the parameters are missing in
from or present in both from and to and mismatch. If the parameters in
from and to are both present and match this function has no effect.
The function EVP_PKEY_cmp_parameters() compares the parameters of keys
a and b.
The function EVP_PKEY_cmp() compares the public key components and
paramters (if present) of keys a and b.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | library/security/openssl |
+---------------+--------------------------+
|Stability | Pass-through uncommitted |
+---------------+--------------------------+
NOTES
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.
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
https://www.openssl.org/source/openssl-1.0.2ze.tar.gz.
Further information about this software can be found on the open source
community website at https://www.openssl.org/.
RETURN VALUES
The function EVP_PKEY_missing_parameters() returns 1 if the public key
parameters of pkey are missing and 0 if they are present or the
algorithm doesn't use parameters.
These functions EVP_PKEY_copy_parameters() returns 1 for success and 0
for failure.
The function 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)
1.0.2ze 2022-05-03 EVP_PKEY_cmp(3openssl)