Use key derivation function B<algorithm>. The supported algorithms are
at present B<TLS1-PRF> and B<HKDF>.
Note: additional parameters and the KDF output length will normally have to be
-set for this to work. See L<EVP_PKEY_HKDF(3)> and L<EVP_PKEY_TLS1_PRF(3)>
+set for this to work.
+See L<EVP_PKEY_CTX_set_hkdf_md(3)> and L<EVP_PKEY_CTX_set_tls1_prf_md(3)>
for the supported string parameters of each algorithm.
=item B<-kdflen length>
L<genpkey(1)>, L<pkey(1)>, L<rsautl(1)>
L<dgst(1)>, L<rsa(1)>, L<genrsa(1)>,
-L<EVP_PKEY_HKDF(3)>, L<EVP_PKEY_TLS1_PRF(3)>
+L<EVP_PKEY_CTX_set_hkdf_md(3)>, L<EVP_PKEY_CTX_set_tls1_prf_md(3)>
=head1 COPYRIGHT