1CURLOPT_SSL_EC_CURVES(3) curl_easy_setopt options CURLOPT_SSL_EC_CURVES(3)
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6 CURLOPT_SSL_EC_CURVES - key exchange curves
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9 #include <curl/curl.h>
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11 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char
12 *alg_list);
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15 Pass a string as parameter with a colon delimited list of (EC) algo‐
16 rithms. This option defines the client's key exchange algorithms in the
17 SSL handshake (if the SSL backend libcurl is built to use supports it).
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20 "", embedded in SSL backend
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23 HTTP
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26 CURL *curl = curl_easy_init();
27 if(curl) {
28 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
29 curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521");
30 ret = curl_easy_perform(curl);
31 curl_easy_cleanup(curl);
32 }
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35 Added in 7.73.0. Supported by the OpenSSL backend.
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38 Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
39 if not.
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42 CURLOPT_SSL_OPTIONS(3), CURLOPT_SSL_CIPHER_LIST(3), CURLOPT_TLS13_CI‐
43 PHERS(3),
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47libcurl 7.79.1 September 08, 2021 CURLOPT_SSL_EC_CURVES(3)