70 lines
1.4 KiB
Markdown
70 lines
1.4 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_SSL_EC_CURVES
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_SSL_CIPHER_LIST (3)
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- CURLOPT_SSL_OPTIONS (3)
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- CURLOPT_TLS13_CIPHERS (3)
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Protocol:
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- TLS
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TLS-backend:
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- OpenSSL
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- wolfSSL
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Added-in: 7.73.0
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---
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# NAME
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CURLOPT_SSL_EC_CURVES - key exchange curves
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *list);
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~~~
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# DESCRIPTION
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Pass a string as parameter with a colon delimited list of Elliptic curve (EC)
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algorithms. This option defines the client's key exchange algorithms in the
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SSL handshake (if the SSL backend libcurl is built to use supports it).
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The application does not have to keep the string around after setting this
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option.
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Using this option multiple times makes the last set string override the
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previous ones. Set it to NULL to restore back to internal default.
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# DEFAULT
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"", embedded in SSL backend
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
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curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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