Document EVP_PKEY_set1_engine()

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_get0_hmac,

EVP_PKEY_type, EVP_PKEY_id, EVP_PKEY_base_id

- EVP_PKEY assignment functions

EVP_PKEY_assign_RSA, EVP_PKEY_assign_DSA, EVP_PKEY_assign_DH,

EVP_PKEY_assign_EC_KEY, EVP_PKEY_get0_hmac, EVP_PKEY_type, EVP_PKEY_id,

EVP_PKEY_base_id, EVP_PKEY_set1_engine - EVP_PKEY assignment functions

=head1 SYNOPSIS

 int EVP_PKEY_base_id(const EVP_PKEY *pkey);

 int EVP_PKEY_type(int type);

 int EVP_PKEY_set1_engine(EVP_PKEY *pkey, ENGINE *engine);

=head1 DESCRIPTION

EVP_PKEY_set1_RSA(), EVP_PKEY_set1_DSA(), EVP_PKEY_set1_DH() and

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>.

EVP_PKEY_set1_engine() sets the ENGINE handling B<pkey> to B<engine>. It

must be called after the key algorithm and components are set up.

If B<engine> does not include an B<EVP_PKEY_METHOD> for B<pkey> an

error occurs.

=head1 NOTES

In accordance with the OpenSSL naming convention the key obtained

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).

EVP_PKEY_set1_engine() is typically used by an ENGINE returning an HSM

key as part of its routine to load a private key.

=head1 RETURN VALUES

EVP_PKEY_set1_RSA(), EVP_PKEY_set1_DSA(), EVP_PKEY_set1_DH() and

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.

EVP_PKEY_set1_engine() returns 1 for success and 0 for failure.

=head1 SEE ALSO

L<EVP_PKEY_new(3)>