Tribblix: manual page: CURLOPT

CURLOPT_SSLKEYTYPE(3) Introduction to Library Functions

NAME

CURLOPT_SSLKEYTYPE - type of the private key file

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLKEYTYPE, char *type);

DESCRIPTION

Pass a pointer to a null-terminated string as parameter. The string
should be the format of your private key. Supported formats are
"PEM", "DER", "ENG" and "PROV".

The format "ENG" enables you to load the private key from a crypto
engine. In this case CURLOPT_SSLKEY(3) is used as an identifier
passed to the engine. You have to set the crypto engine with
CURLOPT_SSLENGINE(3).

The format "PROV" enables you to load the private key from a crypto
provider (Added in 8.12.0). In this case CURLOPT_SSLKEY(3) is used as
an identifier passed to the provider.

The "DER" format does not work with OpenSSL.

The application does not have to keep the string around after setting
this option.

Using this option multiple times makes the last set string override
the previous ones. Set it to NULL to restore to internal default.

DEFAULT

"PEM"

PROTOCOLS

This functionality affects all TLS based protocols: HTTPS, FTPS,
IMAPS, POP3S, SMTPS etc.

This option works only with the following TLS backends: BearSSL,
OpenSSL and wolfSSL

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_SSLCERT, "client.pem");
curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, "PEM");
curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}

AVAILABILITY

Added in curl 7.9.3

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).