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    openssl_get_curve_names

    (PHP 7 >= 7.1.0, PHP 8)

    openssl_get_curve_names — ECC で利用可能な楕円曲線の名前を取得する

    説明

    openssl_get_curve_names(): array|false

    楕円曲線暗号(ECC) の公開鍵/秘密鍵の操作に使う、 利用可能な楕円曲線の名前の一覧を取得します。 もっとも広く使われている標準的な/サポートされている曲線名は prime256v1 (NIST P-256) と secp384r1 (NIST P-384) です。

    AES, RSA, DSA のキーサイズとおおよそ等しい ECC のキーサイズ
    AES Symmetric Keysize (Bits) RSA and DSA Keysize (Bits) ECC Keysize (Bits)
    80 1024 160
    112 2048 224
    128 3072 256
    192 7680 384
    256 15360 512
    » NIST は ECC の楕円曲線を少なくとも256ビットで使うことを推奨しています

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    利用可能な曲線名の array を返します。 失敗した場合に false を返します

    例

    例1 openssl_get_curve_names() の例

    <?php
    $curve_names     = openssl_get_curve_names();
    print_r($curve_names);
    ?>

    上の例の出力は、 たとえば以下のようになります。

    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
)

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