On Thu, 12 Jan 2017, Daniel Stenberg wrote:

>> The SSL backends that have no random support return CURLE_NOT_BUILT_IN as
>> their value for curlssl_random(). This causes vtls.c:Curl_ssl_random() to
>> fail and return CURLE_FAILED_INIT, which then causes rand.c:randit() to
>> give up and return an error.
>
> Ouch. Another case that worked for me when I tested locally because I built
> debug-enabled... :-/ I'll write up a fix. Stay tuned.

Thanks for your report!

I just pushed this commit:
https://github.com/curl/curl/commit/807698db025f489dd7894f1195e4983be632bee2

I reproduced the problem with mbedtls, then made sure the fixed version works
with it. And I tested with openssl both before and after the fix.

There are a lot of TLS backends, if someone spots any quirk brought by this
just speak up and we'll fix!

-- 
  / daniel.haxx.se
-------------------------------------------------------------------
List admin: https://cool.haxx.se/list/listinfo/curl-library
Etiquette:  https://curl.haxx.se/mail/etiquette.html