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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_get0_RSA, EVP_PKEY_get0_DSA, EVP_PKEY_get0_DH, EVP_PKEY_get0_EC_KEY,
EVP_PKEY_assign_RSA, EVP_PKEY_assign_DSA, EVP_PKEY_assign_DH, EVP_PKEY_assign_EC_KEY,
EVP_PKEY_type, EVP_PKEY_id, EVP_PKEY_base_id - 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);
RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey);
DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey);
DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey);
EC_KEY *EVP_PKEY_get0_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_id(const EVP_PKEY *pkey);
int EVP_PKEY_base_id(const EVP_PKEY *pkey);
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_get0_RSA(), EVP_PKEY_get0_DSA(), EVP_PKEY_get0_DH() and
EVP_PKEY_get0_EC_KEY() also return the referenced key in B<pkey> or
B<NULL> if the key is not of the correct type but the reference
count of the returned key is B<not> incremented and so must not
be freed up after use.
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_base_id() returns the type of B<pkey>. For example
an RSA key will return B<EVP_PKEY_RSA>.
EVP_PKEY_id() returns the actual OID associated with B<pkey>. Historically keys
using the same algorithm could use different OIDs. For example an RSA key could
use the OIDs corresponding to the NIDs B<NID_rsaEncryption> (equivalent to
B<EVP_PKEY_RSA>) or B<NID_rsa> (equivalent to B<EVP_PKEY_RSA2>). The use of
alternative non-standard OIDs is now rare so B<EVP_PKEY_RSA2> et al are not
often seen in practice.
EVP_PKEY_type() returns the underlying type of the NID B<type>. For example
EVP_PKEY_type(EVP_PKEY_RSA2) will return B<EVP_PKEY_RSA>.
=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.
Most applications wishing to know a key type will simply call
EVP_PKEY_base_id() and will not care about the actual type:
which will be identical in almost all cases.
Previous versions of this document suggested using EVP_PKEY_type(pkey->type)
to determine the type of a key. Since B<EVP_PKEY> is now opaque this
is no longer possible: the equivalent is EVP_PKEY_base_id(pkey).
=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.
EVP_PKEY_base_id(), EVP_PKEY_id() and EVP_PKEY_type() return a key
type or B<NID_undef> (equivalently B<EVP_PKEY_NONE>) on error.
=head1 SEE ALSO
L<EVP_PKEY_new(3)>
=cut
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