ECDSA Authentication

[ducdetronquito]

Hi @alexnask !

I use iguanaTLS for my http client (requestz) and it works like a charm !

But yesterday, someone figured out he could not request a specific HTTP server because of a TLS handshake failure.

After a small analysis, it seems like the cypher suites available in iguanaTLS are not accepted by the server:
it accepts "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256" and the closest one that iguanaTLS provides is "ECDHE-RSA-CHACHA20-POLY1305".

I don't know much about TLS/crypto in general, but if possible I am willing to try something to make it work for iguanaTLS. I would be very happy if anyone could provide me some advice/guidelines on the matter !

I hope you are doing fine, and I wish you a nice day :)

Cf:
Issue: ducdetronquito/requestz#22
The targeted server: api.forismatic.com
Server's accepted cypher suites: https://www.ssllabs.com/ssltest/analyze.html?d=api.forismatic.com&s=104.21.72.231
Cypher suites provided by iguanaTLS:
- ECDHE-RSA-CHACHA20-POLY1305
- ECDHE-RSA-AES128-GCM-SHA256