CURLOPT_TLSAUTH_TYPE(3) Library Functions Manual CURLOPT_TLSAUTH_TYPE(3)
NAME
CURLOPT_TLSAUTH_TYPE - TLS authentication methods
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_TYPE, char *type);
DESCRIPTION
Pass a pointer to a null-terminated string as parameter. The string
should be the method of the TLS authentication. Supported method is
"SRP".
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to restore to internal default.
The application does not have to keep the string around after setting
this option.
SRP TLS-SRP authentication. Secure Remote Password authentication for
TLS is defined in RFC 5054 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_PASS-
WORD(3) options.
TLS SRP does not work with TLS 1.3.
DEFAULT
blank
PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS,
POP3S, SMTPS etc.
This option works only with the following TLS backends: GnuTLS and
OpenSSL
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_TLSAUTH_TYPE, "SRP");
curl_easy_setopt(curl, CURLOPT_TLSAUTH_USERNAME, "user");
curl_easy_setopt(curl, CURLOPT_TLSAUTH_PASSWORD, "secret");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
AVAILABILITY
Added in curl 7.21.4
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_TLSAUTH_PASSWORD(3), CURLOPT_TLSAUTH_USERNAME(3)
libcurl 2026-07-12 CURLOPT_TLSAUTH_TYPE(3)
Generated by dwww version 1.16 on Sat Oct 3 05:46:04 CEST 2026.