curl/docs/libcurl/opts/CURLOPT_SSLKEY.md
Daniel Stenberg e694c8284a
docs/libcurl/opts: clarify the return values
Expand a little.

- mention the type name of the return code
- avoid stating which exact return codes that might be returned, as that
  varies over time, builds and conditions
- avoid stating some always return OK
- refer to the manpage documenting all the return codes

Closes #15900
2025-01-02 17:13:33 +01:00

81 lines
1.7 KiB
Markdown

---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_SSLKEY
Section: 3
Source: libcurl
See-also:
- CURLOPT_SSLCERT (3)
- CURLOPT_SSLKEYTYPE (3)
- CURLOPT_SSLKEY_BLOB (3)
Protocol:
- TLS
TLS-backend:
- OpenSSL
- mbedTLS
- Schannel
- wolfSSL
Added-in: 7.9.3
---
# NAME
CURLOPT_SSLKEY - private key file for TLS and SSL client cert
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLKEY, char *keyfile);
~~~
# DESCRIPTION
Pass a pointer to a null-terminated string as parameter. The string should be
the filename of your private key. The default format is "PEM" and can be
changed with CURLOPT_SSLKEYTYPE(3).
(Windows, iOS and macOS) This option is ignored by Secure Transport and
Schannel SSL backends because they expect the private key to be already present
in the key-chain or PKCS#12 file containing the certificate.
The application does not have to keep the string around after setting this
option.
Using this option multiple times makes the last set string override the
previous ones. Set it to NULL to disable its use again.
# DEFAULT
NULL
# %PROTOCOLS%
# EXAMPLE
~~~c
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_SSLCERT, "client.pem");
curl_easy_setopt(curl, CURLOPT_SSLKEY, "key.pem");
curl_easy_setopt(curl, CURLOPT_KEYPASSWD, "s3cret");
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
}
~~~
# %AVAILABILITY%
# RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
libcurl-errors(3).