cipher ctx. This is currently only supported by 3DES (which sets the key to
odd parity).
+=item "alg_id_param" (B<OSSL_CIPHER_PARAM_ALG_ID>) (octet string)
+
+Used to pass the DER encoded AlgorithmIdentifier parameter to or from
+the cipher implementation. Functions like L<EVP_CIPHER_param_to_asn1(3)>
+and L<EVP_CIPHER_asn1_to_param(3)> use this parameter for any implementation
+that has the flag B<EVP_CIPH_FLAG_CUSTOM_ASN1> set.
+
=back
=head1 RETURN VALUES