PHP openssl_get_curve_names() Function

The openssl_get_curve_names() function is an inbuilt function in PHP which is used to curve names in Elliptic curve cryptography. The two most widely standardized or supported curves are prime256v1 (NIST P-256) and secp384r1 (NIST P-384). The curve names usually contain a number which is the number of bits in the binary representation.

Approximate Equivalencies of AES, RSA, DSA and ECC Keysizes

Syntax:

 
  openssl_get_curve_names ( void ): array

Parameters: This function does not accept any parameter.

Return Values: This function return an array of available curve names.

Below programs illustrate the openssl_get_curve_names() function in PHP.

Example:

<?php {
    //available curve names for ECC
    $curve_names = openssl_get_curve_names();
    
    // print all curve names
    print_r($curve_names);
}

?>

Output:

Array
(
   [0] => secp112r1
   [1] => secp112r2
   [2] => secp128r1
   [3] => secp128r2
   [4] => secp160k1
   [5] => secp160r1
   [6] => secp160r2
   [7] => secp192k1
   [8] => secp224k1
   [9] => secp224r1
   [10] => secp256k1
   [11] => secp384r1
   [12] => secp521r1
   [13] => prime192v1
   [14] => prime192v2
   [15] => prime192v3
   [16] => prime239v1
   [17] => prime239v2
   [18] => prime239v3
   [19] => prime256v1
   [20] => sect113r1
   [21] => sect113r2
   [22] => sect131r1
   [23] => sect131r2
   [24] => sect163k1
   [25] => sect163r1
   [26] => sect163r2
   [27] => sect193r1
   [28] => sect193r2
   [29] => sect233k1
   [30] => sect233r1
   [31] => sect239k1
   [32] => sect283k1
   [33] => sect283r1
   [34] => sect409k1
   [35] => sect409r1
   [36] => sect571k1
   [37] => sect571r1
   [38] => c2pnb163v1
   [39] => c2pnb163v2
   [40] => c2pnb163v3
   [41] => c2pnb176v1
   [42] => c2tnb191v1
   [43] => c2tnb191v2
   [44] => c2tnb191v3
   [45] => c2pnb208w1
   [46] => c2tnb239v1
   [47] => c2tnb239v2
   [48] => c2tnb239v3
   [49] => c2pnb272w1
   [50] => c2pnb304w1
   [51] => c2tnb359v1
   [52] => c2pnb368w1
   [53] => c2tnb431r1
   [54] => wap-wsg-idm-ecid-wtls1
   [55] => wap-wsg-idm-ecid-wtls3
   [56] => wap-wsg-idm-ecid-wtls4
   [57] => wap-wsg-idm-ecid-wtls5
   [58] => wap-wsg-idm-ecid-wtls6
   [59] => wap-wsg-idm-ecid-wtls7
   [60] => wap-wsg-idm-ecid-wtls8
   [61] => wap-wsg-idm-ecid-wtls9
   [62] => wap-wsg-idm-ecid-wtls10
   [63] => wap-wsg-idm-ecid-wtls11
   [64] => wap-wsg-idm-ecid-wtls12
   [65] => Oakley-EC2N-3
   [66] => Oakley-EC2N-4
   [67] => brainpoolP160r1
   [68] => brainpoolP160t1
   [69] => brainpoolP192r1
   [70] => brainpoolP192t1
   [71] => brainpoolP224r1
   [72] => brainpoolP224t1
   [73] => brainpoolP256r1
   [74] => brainpoolP256t1
   [75] => brainpoolP320r1
   [76] => brainpoolP320t1
   [77] => brainpoolP384r1
   [78] => brainpoolP384t1
   [79] => brainpoolP512r1
   [80] => brainpoolP512t1
   [81] => SM2
)

Reference: https://www.php.net/manual/en/function.openssl-get-curve-names.php