Hi,

 

Until libcurl 7.60 the CURLOPT_TLS13_CIPHERS option was necessary to use TLS 1.3 with libcurl.

However the option was not documented so I assumed it was a boolean to toggle tls 13 on and I set the option like this:

 

curl_easy_setopt(curl, CURLOPT_TLS13_CIPHERS, 1L);

 

Which worked I could successfully establish a TLS 1.3 connection (with better Appconnect times than TLS 1.2)

 

Now with 7.61 the documentation for the option got added an I realized 1L makes no sense as an argument as the library expects a zero terminated string or NULL.

I am curious why it worked anyways. Can somebody familiar with the libcurl code tell me what passing 1L as an argument does?

 

My second question is about the NULL argument:

Documentation: " NULL, use internal default "

What is the internal default?

The full list of TLS 1.3 ciphers? (TLS13-AES-256-GCM-SHA384 TLS13-CHACHA20-POLY1305-SHA256 TLS13-AES-128-GCM-SHA256 TLS13-AES-128-CCM-8-SHA256 TLS13-AES-128-CCM-SHA256)

 

-- Bernhard Jaeger