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

NAME
     CURLOPT_PROXY_SSLKEY_BLOB - private key for proxy cert from memory blob

SYNOPSIS
     #include <curl/curl.h>

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

DESCRIPTION
     Pass  a pointer to a curl_blob structure that contains information (pointer
     and size) about the private key for connecting to the HTTPS proxy. Compati-
     ble with OpenSSL. The format (like  "PEM")  must  be  specified  with  CUR-
     LOPT_PROXY_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.

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

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

     extern char *privateKeyData; /* point to data */
     extern size_t privateKeySize; /* size */

     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/");
	 curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy.example");
	 blob.data = certificateData;
	 blob.len = filesize;
	 blob.flags = CURL_BLOB_COPY;
	 curl_easy_setopt(curl, CURLOPT_PROXY_SSLCERT_BLOB, &blob);
	 curl_easy_setopt(curl, CURLOPT_PROXY_SSLCERTTYPE, "PEM");

	 blob.data = privateKeyData;
	 blob.len = privateKeySize;
	 curl_easy_setopt(curl, CURLOPT_PROXY_SSLKEY_BLOB, &blob);
	 curl_easy_setopt(curl, CURLOPT_PROXY_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_SSLKEY(3), CURLOPT_SSLKEYTYPE(3), CURLOPT_SSLKEY_BLOB(3)

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

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