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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 for-
       mat (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 ex-
       pects a filename	as input.

DEFAULT
       NULL

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

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

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	curl 7.71.0

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_SSLKEY(3), CURLOPT_SSLKEYTYPE(3)

libcurl				  2025-06-03		CURLOPT_SSLKEY_BLOB(3)

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