B<NID_undef> is returned.
SSL_CIPHER_get_kx_nid() returns the key exchange NID corresponding to the method
-used by B<c>. If there is no key exchange, then B<NID_undef> is returned. Examples (not comprehensive):
+used by B<c>. If there is no key exchange, then B<NID_undef> is returned.
+If any appropriate key exchange algorithm can be used (as in the case of TLS 1.3
+ciphersuites) B<NID_kx_any> is returned. Examples (not comprehensive):
NID_kx_rsa
NID_kx_ecdhe
SSL_CIPHER_get_auth_nid() returns the authentication NID corresponding to the method
used by B<c>. If there is no authentication, then B<NID_undef> is returned.
-Examples (not comprehensive):
+If any appropriate authentication algorithm can be used (as in the case of
+TLS 1.3 ciphersuites) B<NID_auth_any> is returned. Examples (not comprehensive):
NID_auth_rsa
NID_auth_ecdsa