53 lines
1.6 KiB
Groff
53 lines
1.6 KiB
Groff
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.\" generated by cd2nroff 0.1 from CURLOPT_SSL_EC_CURVES.md
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.TH CURLOPT_SSL_EC_CURVES 3 "2025-07-07" libcurl
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.SH NAME
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CURLOPT_SSL_EC_CURVES \- key exchange curves
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.SH SYNOPSIS
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.nf
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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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.fi
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.SH 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\(aqs 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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.SH DEFAULT
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\&"", embedded in SSL backend
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.SH PROTOCOLS
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This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.
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This option works only with the following TLS backends:
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OpenSSL and wolfSSL
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.SH EXAMPLE
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.nf
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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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.fi
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.SH AVAILABILITY
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Added in curl 7.73.0
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.SH RETURN VALUE
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\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
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\fIlibcurl\-errors(3)\fP.
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.SH SEE ALSO
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.BR CURLOPT_SSL_CIPHER_LIST (3),
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.BR CURLOPT_SSL_OPTIONS (3),
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.BR CURLOPT_TLS13_CIPHERS (3)
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