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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
+.\" *                            | (__| |_| |  _ <| |___
+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <[email protected]>, 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.
+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_SSL_CTX_DATA 3 "November 04, 2020" "libcurl 7.75.0" "curl_easy_setopt options"
+
+.SH NAME
+CURLOPT_SSL_CTX_DATA \- custom pointer passed to ssl_ctx callback
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CTX_DATA, void *pointer);
+.SH DESCRIPTION
+Data \fIpointer\fP to pass to the ssl context callback set by the option
+\fICURLOPT_SSL_CTX_FUNCTION(3)\fP, this is the pointer you'll get as third
+parameter.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+.SH EXAMPLE
+.nf
+/* OpenSSL specific */
+
+#include <openssl/ssl.h>
+#include <curl/curl.h>
+#include <stdio.h>
+
+static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
+{
+  X509_STORE *store;
+  X509 *cert=NULL;
+  BIO *bio;
+  char *mypem = (char *)parm;
+  /* get a BIO */
+  bio=BIO_new_mem_buf(mypem, -1);
+  /* use it to read the PEM formatted certificate from memory into an
+   * X509 structure that SSL can use
+   */
+  PEM_read_bio_X509(bio, &cert, 0, NULL);
+  if(cert == NULL)
+    printf("PEM_read_bio_X509 failed...\\n");
+
+  /* get a pointer to the X509 certificate store (which may be empty) */
+  store=SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
+
+  /* add our certificate to this store */
+  if(X509_STORE_add_cert(store, cert)==0)
+    printf("error adding certificate\\n");
+
+  /* decrease reference counts */
+  X509_free(cert);
+  BIO_free(bio);
+
+  /* all set to go */
+  return CURLE_OK;
+}
+
+int main(void)
+{
+  CURL * ch;
+  CURLcode rv;
+  char *mypem = /* example CA cert PEM - shortened */
+    "-----BEGIN CERTIFICATE-----\\n"
+    "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\\n"
+    "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\\n"
+    "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\\n"
+    "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\\n"
+    "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\\n"
+    "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\\n"
+    "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\\n"
+    "-----END CERTIFICATE-----\\n";
+
+  rv=curl_global_init(CURL_GLOBAL_ALL);
+  ch=curl_easy_init();
+  rv=curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
+  rv=curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 1L);
+  rv=curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
+
+  /* Retrieve page using cacerts' certificate -> will succeed
+   * load the certificate by installing a function doing the necessary
+   * "modifications" to the SSL CONTEXT just before link init
+   */
+  rv=curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
+  rv=curl_easy_setopt(ch, CURLOPT_SSL_CTX_DATA, mypem);
+  rv=curl_easy_perform(ch);
+  if(rv==CURLE_OK)
+    printf("*** transfer succeeded ***\\n");
+  else
+    printf("*** transfer failed ***\\n");
+
+  curl_easy_cleanup(ch);
+  curl_global_cleanup();
+  return rv;
+}
+.fi
+.SH AVAILABILITY
+Added in 7.11.0 for OpenSSL, in 7.42.0 for wolfSSL and in 7.54.0 for
+mbedTLS. Other SSL backends are not supported.
+.SH RETURN VALUE
+CURLE_OK if supported; or an error such as:
+
+CURLE_NOT_BUILT_IN - Not supported by the SSL backend
+
+CURLE_UNKNOWN_OPTION
+.SH "SEE ALSO"
+.BR CURLOPT_SSL_CTX_FUNCTION "(3), " CURLOPT_SSLVERSION "(3), "