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=pod
=head1 NAME
EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp - public key parameter and comparison functions
=head1 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);
=head1 DESCRIPTION
The function EVP_PKEY_missing_parameters() returns 1 if the public key
parameters of B<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
B<from> to key B<to>.
The funcion EVP_PKEY_cmp_parameters() compares the parameters of keys
B<a> and B<b>.
The funcion EVP_PKEY_cmp() compares the public key components and parameters
(if present) of keys B<a> and B<b>.
=head1 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.
=head1 RETURN VALUES
The function EVP_PKEY_missing_parameters() returns 1 if the public key
parameters of B<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.
=head1 SEE ALSO
L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)>
=cut
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