ParagonIE_Sodium_Compat::crypto_sign_ed25519_sk_to_curve25519

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Summery Summery

Convert an Ed25519 secret key to a Curve25519 secret key

Syntax Syntax

ParagonIE_Sodium_Compat::crypto_sign_ed25519_sk_to_curve25519( string $sk )

Parameters Parameters

$sk

(string) (Required)

Return Return

(string)

Source Source

File: wp-includes/sodium_compat/src/Compat.php

    public static function crypto_sign_ed25519_sk_to_curve25519($sk)
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($sk, 'string', 1);

        /* Input validation: */
        if (ParagonIE_Sodium_Core_Util::strlen($sk) < self::CRYPTO_SIGN_SEEDBYTES) {
            throw new SodiumException('Argument 1 must be at least CRYPTO_SIGN_SEEDBYTES long.');
        }
        if (self::useNewSodiumAPI()) {
            if (is_callable('crypto_sign_ed25519_sk_to_curve25519')) {
                return sodium_crypto_sign_ed25519_sk_to_curve25519($sk);
            }
        }
        if (self::use_fallback('crypto_sign_ed25519_sk_to_curve25519')) {
            return (string) call_user_func('\\Sodium\\crypto_sign_ed25519_sk_to_curve25519', $sk);
        }

        $h = hash('sha512', ParagonIE_Sodium_Core_Util::substr($sk, 0, 32), true);
        $h[0] = ParagonIE_Sodium_Core_Util::intToChr(
            ParagonIE_Sodium_Core_Util::chrToInt($h[0]) & 248
        );
        $h[31] = ParagonIE_Sodium_Core_Util::intToChr(
            (ParagonIE_Sodium_Core_Util::chrToInt($h[31]) & 127) | 64
        );
        return ParagonIE_Sodium_Core_Util::substr($h, 0, 32);
    }

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