set TLS authentication methods
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_TYPE, char *type);
Pass a pointer to a zero terminated string as parameter. The string
should be the method of the TLS authentication. Supported method is "SRP".
TLS-SRP authentication. Secure Remote Password authentication for TLS is
defined in RFC5054 and provides mutual authentication if both sides have a
shared secret. To use TLS-SRP, you must also set the
CURLOPT_TLSAUTH_USERNAME(3) and CURLOPT_TLSAUTH_PASSWORD(3)
All TLS-based protocols
You need to build libcurl with GnuTLS or OpenSSL with TLS-SRP support for this
to work. Added in 7.21.4
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.