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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  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 af-
     ter setting this.

     This  option is an alternative to CURLOPT_SSLKEY(3) which instead expects 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 result;
	 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");
	 result = 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 			   2026-06-11		  CURLOPT_SSLKEY_BLOB(3)

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