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CURLOPT_PROXY_SSLCERT_BLOB(3) curl_easy_setopt options
CURLOPT_PROXY_SSLCERT_BLOB - SSL proxy client certificate from memory
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERT_BLOB,
struct curl_blob *blob);
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 Secure Transport or Schannel. The format must be "P12" or
"PEM" on OpenSSL. The string "P12" or "PEM" must be specified with
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_PROXY_SSLCERT(3) which instead
expects a file name as input.
Used with HTTPS proxy
CURL *curl = curl_easy_init();
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");
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);
ret = curl_easy_perform(curl);
Added in 7.71.0. This option is supported by the OpenSSL, Secure
Transport and Schannel backends.
Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
libcurl 7.87.0 September 6, 2022 CURLOPT_PROXY_SSLCERT_BLOB(3)