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CURLOPT_SSL_EC_CURVES.3

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    23. 

  23. .TH CURLOPT_SSL_EC_CURVES 3 "29 Aug 2020" "libcurl 7.73.0" "curl_easy_setopt options"
    24. 

  24. .SH NAME
    25. 

  25. CURLOPT_SSL_EC_CURVES \- set key exchange curves
    26. 

  26. .SH SYNOPSIS
    27. 

  27. #include <curl/curl.h>
    28. 

  28. 

  29. CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_EC_CURVES, char *alg_list);
    30. 

  30. .SH DESCRIPTION
    31. 

  31. Pass a string as parameter with a colon delimited list of (EC) algorithms. This
    32. 

  32. option defines the client's key exchange algorithms in the SSL handshake (if
    33. 

  33. the SSL backend libcurl is built to use supports it).
    34. 

  34. .SH DEFAULT
    35. 

  35. "", embedded in SSL backend
    36. 

  36. .SH PROTOCOLS
    37. 

  37. HTTP
    38. 

  38. .SH EXAMPLE
    39. 

  39. .nf
    40. 

  40. CURL *curl = curl_easy_init();
    41. 

  41. if(curl) {
    42. 

  42.   curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    43. 

  43.   curl_easy_setopt(curl, CURLOPT_SSL_EC_CURVES, "X25519:P-521");
    44. 

  44.   ret = curl_easy_perform(curl);
    45. 

  45.   curl_easy_cleanup(curl);
    46. 

  46. }
    47. 

  47. .fi
    48. 

  48. .SH AVAILABILITY
    49. 

  49. Added in 7.73.0. Supported by the OpenSSL backend.
    50. 

  50. .SH RETURN VALUE
    51. 

  51. Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
    52. 

  52. .SH "SEE ALSO"
    53. 

  53. .BR CURLOPT_SSL_OPTIONS "(3), " CURLOPT_SSL_CIPHER_LIST "(3), "
    54. 

  54. .BR CURLOPT_TLS13_CIPHERS "(3), "
    55.