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=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()
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

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