**************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
**************************************************************************

CURLOPT_CAINFO_BLOB - Certificate Authority (CA) bundle in PEM format #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO_BLOB, struct curl_blob *stblob); Pass a pointer to a curl_blob structure, which contains information (pointer and size) about a memory block with binary data of PEM encoded content holding one or more certificates to verify the HTTPS server with. If CURLOPT_SSL_VERIFYPEER(3) is zero and you avoid verifying the server's certificate, CURLOPT_CAINFO_BLOB(3) is not needed. This option overrides CURLOPT_CAINFO(3). NULL All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

char *strpem; /* strpem must point to a PEM string */
CURL *curl = curl_easy_init();
if(curl) {
 struct curl_blob blob;
 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
 blob.data = strpem;
 blob.len = strlen(strpem);
 blob.flags = CURL_BLOB_COPY;
 curl_easy_setopt(curl, CURLOPT_CAINFO_BLOB, &blob);
 ret = curl_easy_perform(curl);
 curl_easy_cleanup(curl);
}

Added in 7.77.0. This option is supported by the BearSSL (since 7.79.0), OpenSSL, Secure Transport and Schannel backends. Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. CURLOPT_CAINFO "(3), " CURLOPT_CAPATH "(3), " CURLOPT_SSL_VERIFYPEER "(3), " CURLOPT_SSL_VERIFYHOST "(3), "