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CURLOPT_PR...LCERT_BLOB(3)  Library Functions Manual  CURLOPT_PR...LCERT_BLOB(3)

NAME
     CURLOPT_PROXY_SSLCERT_BLOB - SSL proxy client certificate from memory blob

SYNOPSIS
     #include <curl/curl.h>

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

DESCRIPTION
     Pass  a  pointer  to  a  curl_blob  structure,  which  contains information
     (pointer and size) about a memory block with binary data of the certificate
     used to connect to the HTTPS proxy. The format must be "P12"  on  Schannel.
     The  format  must	be  "P12" or "PEM" on OpenSSL. The string "P12" or "PEM"
     must be specified with CURLOPT_PROXY_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_PROXY_SSLCERT(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 Schan-
     nel

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

     int main(void)
     {
       CURL *curl = curl_easy_init();
       if(curl) {
	 CURLcode result;
	 struct curl_blob blob;
	 blob.data = certificateData;
	 blob.len = filesize;
	 blob.flags = CURL_BLOB_COPY;
	 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
	 curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy.example");
	 curl_easy_setopt(curl, CURLOPT_PROXY_SSLKEY, "key.pem");
	 curl_easy_setopt(curl, CURLOPT_PROXY_KEYPASSWD, "s3cret");
	 curl_easy_setopt(curl, CURLOPT_PROXY_SSLCERT_BLOB, &blob);
	 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_PROXY_SSLCERT(3),	CURLOPT_PROXY_SSLCERTTYPE(3),  CURLOPT_PROXY_SS-
     LKEY(3), CURLOPT_SSLCERT_BLOB(3)

libcurl 			   2026-06-11	      CURLOPT_PR...LCERT_BLOB(3)

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