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CURLOPT_SSLCERT_BLOB(3)     Library Functions Manual	 CURLOPT_SSLCERT_BLOB(3)

NAME
     CURLOPT_SSLCERT_BLOB - SSL client certificate from memory blob

SYNOPSIS
     #include <curl/curl.h>

     CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT_BLOB,
			       struct curl_blob *stblob);

DESCRIPTION
     Pass  a pointer to a curl_blob structure, which contains (pointer and size)
     a client certificate. The format must be "P12" on Schannel. The format must
     be "P12" or "PEM" on OpenSSL. The format must be "DER" or "PEM" on mbedTLS.
     The format must be specified with CURLOPT_SSLCERTTYPE(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_SSLCERT(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, Schannel,
     mbedTLS and wolfSSL

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

     int main(void)
     {
       CURL *curl = curl_easy_init();
       if(curl) {
	 CURLcode result;
	 struct curl_blob stblob;
	 stblob.data = certificateData;
	 stblob.len = filesize;
	 stblob.flags = CURL_BLOB_COPY;
	 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
	 curl_easy_setopt(curl, CURLOPT_SSLCERT_BLOB, &stblob);
	 curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "P12");
	 curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
	 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_KEYPASSWD(3), CURLOPT_SSLCERTTYPE(3), CURLOPT_SSLKEY(3)

libcurl 			   2026-06-11		 CURLOPT_SSLCERT_BLOB(3)

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