=pod
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=head1 NAME
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EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters,
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EVP_PKEY_cmp - public key parameter and comparison functions
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
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int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
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int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
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int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);
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=head1 DESCRIPTION
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The function EVP_PKEY_missing_parameters() returns 1 if the public key
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parameters of B<pkey> are missing and 0 if they are present or the algorithm
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doesn't use parameters.
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The function EVP_PKEY_copy_parameters() copies the parameters from key
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B<from> to key B<to>. An error is returned if the parameters are missing in
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B<from> or present in both B<from> and B<to> and mismatch. If the parameters
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in B<from> and B<to> are both present and match this function has no effect.
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The function EVP_PKEY_cmp_parameters() compares the parameters of keys
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B<a> and B<b>.
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The function EVP_PKEY_cmp() compares the public key components and parameters
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(if present) of keys B<a> and B<b>.
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=head1 NOTES
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The main purpose of the functions EVP_PKEY_missing_parameters() and
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EVP_PKEY_copy_parameters() is to handle public keys in certificates where the
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parameters are sometimes omitted from a public key if they are inherited from
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the CA that signed it.
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Since OpenSSL private keys contain public key components too the function
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EVP_PKEY_cmp() can also be used to determine if a private key matches
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a public key.
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=head1 RETURN VALUES
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The function EVP_PKEY_missing_parameters() returns 1 if the public key
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parameters of B<pkey> are missing and 0 if they are present or the algorithm
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doesn't use parameters.
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These functions EVP_PKEY_copy_parameters() returns 1 for success and 0 for
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failure.
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The function EVP_PKEY_cmp_parameters() and EVP_PKEY_cmp() return 1 if the
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keys match, 0 if they don't match, -1 if the key types are different and
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-2 if the operation is not supported.
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_keygen(3)>
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=head1 COPYRIGHT
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Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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