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=pod
=head1 NAME
EVP_PKEY_set1_RSA, EVP_PKEY_set1_DSA, EVP_PKEY_set1_DH, EVP_PKEY_set1_EC_KEY,
EVP_PKEY_get1_RSA, EVP_PKEY_get1_DSA, EVP_PKEY_get1_DH, EVP_PKEY_get1_EC_KEY,
EVP_PKEY_assign_RSA, EVP_PKEY_assign_DSA, EVP_PKEY_assign_DH, EVP_PKEY_assign_EC_KEY,
EVP_PKEY_type - EVP_PKEY assignment functions.
=head1 SYNOPSIS
#include <openssl/evp.h>
int EVP_PKEY_set1_RSA(EVP_PKEY *pkey,RSA *key);
int EVP_PKEY_set1_DSA(EVP_PKEY *pkey,DSA *key);
int EVP_PKEY_set1_DH(EVP_PKEY *pkey,DH *key);
int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey,EC_KEY *key);
RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey);
DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey);
DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey);
EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey);
int EVP_PKEY_assign_RSA(EVP_PKEY *pkey,RSA *key);
int EVP_PKEY_assign_DSA(EVP_PKEY *pkey,DSA *key);
int EVP_PKEY_assign_DH(EVP_PKEY *pkey,DH *key);
int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey,EC_KEY *key);
int EVP_PKEY_type(int type);
=head1 DESCRIPTION
EVP_PKEY_set1_RSA(), EVP_PKEY_set1_DSA(), EVP_PKEY_set1_DH() and
EVP_PKEY_set1_EC_KEY() set the key referenced by B<pkey> to B<key>.
EVP_PKEY_get1_RSA(), EVP_PKEY_get1_DSA(), EVP_PKEY_get1_DH() and
EVP_PKEY_get1_EC_KEY() return the referenced key in B<pkey> or
B<NULL> if the key is not of the correct type.
EVP_PKEY_assign_RSA(), EVP_PKEY_assign_DSA(), EVP_PKEY_assign_DH()
and EVP_PKEY_assign_EC_KEY() also set the referenced key to B<key>
however these use the supplied B<key> internally and so B<key>
will be freed when the parent B<pkey> is freed.
EVP_PKEY_type() returns the type of key corresponding to the value
B<type>. The type of a key can be obtained with
EVP_PKEY_type(pkey->type). The return value will be EVP_PKEY_RSA,
EVP_PKEY_DSA, EVP_PKEY_DH or EVP_PKEY_EC for the corresponding
key types or NID_undef if the key type is unassigned.
=head1 NOTES
In accordance with the OpenSSL naming convention the key obtained
from or assigned to the B<pkey> using the B<1> functions must be
freed as well as B<pkey>.
EVP_PKEY_assign_RSA(), EVP_PKEY_assign_DSA(), EVP_PKEY_assign_DH()
and EVP_PKEY_assign_EC_KEY() are implemented as macros.
=head1 RETURN VALUES
EVP_PKEY_set1_RSA(), EVP_PKEY_set1_DSA(), EVP_PKEY_set1_DH() and
EVP_PKEY_set1_EC_KEY() return 1 for success or 0 for failure.
EVP_PKEY_get1_RSA(), EVP_PKEY_get1_DSA(), EVP_PKEY_get1_DH() and
EVP_PKEY_get1_EC_KEY() return the referenced key or B<NULL> if
an error occurred.
EVP_PKEY_assign_RSA(), EVP_PKEY_assign_DSA(), EVP_PKEY_assign_DH()
and EVP_PKEY_assign_EC_KEY() return 1 for success and 0 for failure.
=head1 SEE ALSO
L<EVP_PKEY_new(3)|EVP_PKEY_new(3)>
=head1 HISTORY
TBA
=cut