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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>. An error is returned if the parameters are missing in
-B<from> or present in both B<from> and B<to> and mismatch. If the parameters
-in B<from> and B<to> are both present and match this function has no effect.
-
-The function EVP_PKEY_cmp_parameters() compares the parameters of keys
-B<a> and B<b>.
-
-The function EVP_PKEY_cmp() compares the public key components and paramters
-(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