CURLOPT_SSLKEY_BLOB(3)     Library Functions Manual     CURLOPT_SSLKEY_BLOB(3)

NAME
       CURLOPT_SSLKEY_BLOB - private key for client cert from memory blob

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLKEY_BLOB,
                                 struct curl_blob *blob);

DESCRIPTION
       Pass a pointer to a curl_blob structure, which contains information
       (pointer and size) for a private key. Compatible with OpenSSL. The
       format (like "PEM") must be specified with CURLOPT_SSLKEYTYPE(3).

       If the blob is initialized with the flags member of struct curl_blob
       set to CURL_BLOB_COPY, the application does not have to keep the buffer
       around after setting this.

       This option is an alternative to CURLOPT_SSLKEY(3) which instead
       expects a filename as input.

DEFAULT
       NULL

PROTOCOLS
       All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

       This option works only with the following TLS backends: OpenSSL

EXAMPLE

       extern char *certificateData; /* point to cert */
       extern size_t filesize; /* size of cert */

       extern char *privateKeyData; /* point to key */
       extern size_t privateKeySize; /* size of key */

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           struct curl_blob blob;
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
           blob.data = certificateData;
           blob.len = filesize;
           blob.flags = CURL_BLOB_COPY;
           curl_easy_setopt(curl, CURLOPT_SSLCERT_BLOB, &blob);
           curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "PEM");

           blob.data = privateKeyData;
           blob.len = privateKeySize;
           curl_easy_setopt(curl, CURLOPT_SSLKEY_BLOB, &blob);
           curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
           curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, "PEM");
           res = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY
       Added in 7.71.0. This option is supported by the OpenSSL backends.

RETURN VALUE
       Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
       CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_SSLKEY(3), CURLOPT_SSLKEYTYPE(3)

libcurl                          April 02 2024          CURLOPT_SSLKEY_BLOB(3)