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.\" generated by cd2nroff 0.1 from CURLOPT_SSLCERT_BLOB.md
.TH CURLOPT_SSLCERT_BLOB 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_SSLCERT_BLOB \- SSL client certificate from memory blob
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT_BLOB,
struct curl_blob *stblob);
.fi
.SH 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
\fICURLOPT_SSLCERTTYPE(3)\fP.
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 \fICURLOPT_SSLCERT(3)\fP which instead
expects a filename as input.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
This option works only with the following TLS backends:
OpenSSL, Schannel, Secure Transport, mbedTLS and wolfSSL
.SH EXAMPLE
.nf
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);
}
}
.fi
.SH AVAILABILITY
Added in curl 7.71.0
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_KEYPASSWD (3),
.BR CURLOPT_SSLCERTTYPE (3),
.BR CURLOPT_SSLKEY (3)