diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/man3/SSL_CTX_set_psk_client_callback.pod | 8 | ||||
| -rw-r--r-- | doc/man3/SSL_CTX_use_psk_identity_hint.pod | 10 |
2 files changed, 18 insertions, 0 deletions
diff --git a/doc/man3/SSL_CTX_set_psk_client_callback.pod b/doc/man3/SSL_CTX_set_psk_client_callback.pod index 6d1a9b57b7..eb4e4f5fa4 100644 --- a/doc/man3/SSL_CTX_set_psk_client_callback.pod +++ b/doc/man3/SSL_CTX_set_psk_client_callback.pod @@ -132,6 +132,14 @@ Note that parameter B<hint> given to the callback may be B<NULL>. A connection established via a TLSv1.3 PSK will appear as if session resumption has occurred so that L<SSL_session_reused(3)> will return true. +There are no known security issues with sharing the same PSK between TLSv1.2 (or +below) and TLSv1.3. However the RFC has this note of caution: + +"While there is no known way in which the same PSK might produce related output +in both versions, only limited analysis has been done. Implementations can +ensure safety from cross-protocol related output by not reusing PSKs between +TLS 1.3 and TLS 1.2." + =head1 RETURN VALUES Return values from the B<SSL_psk_client_cb_func> callback are interpreted as diff --git a/doc/man3/SSL_CTX_use_psk_identity_hint.pod b/doc/man3/SSL_CTX_use_psk_identity_hint.pod index 2b2bc3e20d..c8f7526610 100644 --- a/doc/man3/SSL_CTX_use_psk_identity_hint.pod +++ b/doc/man3/SSL_CTX_use_psk_identity_hint.pod @@ -123,6 +123,16 @@ completely. The B<SSL_psk_find_session_cb_func> callback should return 1 on success or 0 on failure. In the event of failure the connection setup fails. +=head1 NOTES + +There are no known security issues with sharing the same PSK between TLSv1.2 (or +below) and TLSv1.3. However the RFC has this note of caution: + +"While there is no known way in which the same PSK might produce related output +in both versions, only limited analysis has been done. Implementations can +ensure safety from cross-protocol related output by not reusing PSKs between +TLS 1.3 and TLS 1.2." + =head1 SEE ALSO L<SSL_CTX_set_psk_use_session_callback(3)>, |