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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_SSLCERT_BLOB
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_KEYPASSWD (3)
+  - CURLOPT_SSLCERTTYPE (3)
+  - CURLOPT_SSLKEY (3)
+---
+
+# NAME
+
+CURLOPT_SSLCERT_BLOB - SSL client certificate from memory blob
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT_BLOB,
+                          struct curl_blob *stblob);
+~~~
+
+# DESCRIPTION
+
+Pass a pointer to a curl_blob structure, which contains (pointer and size) a
+client certificate. The format must be "P12" on Secure Transport or
+Schannel. The format must be "P12" or "PEM" on OpenSSL. The format must be
+"DER" or "PEM" on mbedTLS. The format must be specified with
+CURLOPT_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 after
+setting this.
+
+This option is an alternative to CURLOPT_SSLCERT(3) which instead
+expects a filename as input.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
+
+# EXAMPLE
+
+~~~c
+
+extern char *certificateData; /* point to data */
+extern size_t filesize; /* size of data */
+
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    struct curl_blob stblob;
+    stblob.data = certificateData;
+    stblob.len = filesize;
+    stblob.flags = CURL_BLOB_COPY;
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
+    curl_easy_setopt(curl, CURLOPT_SSLCERT_BLOB, &stblob);
+    curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "P12");
+    curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.71.0. This option is supported by the OpenSSL, Secure Transport,
+Schannel and mbedTLS (since 7.78.0) backends.
+
+# RETURN VALUE
+
+Returns CURLE_OK if TLS enabled, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.