ParagonIE_Sodium_Compat::crypto_sign_keypair_from_secretkey_and_publickey( string $sk, string $pk ): string

3088    public static function crypto_sign_keypair_from_secretkey_and_publickey(3089        #[\SensitiveParameter]3090        $sk,3091        $pk3092    )  {3093        ParagonIE_Sodium_Core_Util::declareScalarType($sk, 'string', 1);3094        ParagonIE_Sodium_Core_Util::declareScalarType($pk, 'string', 1);3095        $sk = (string) $sk;3096        $pk = (string) $pk;3097 3098        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {3099            throw new SodiumException('secretkey should be SODIUM_CRYPTO_SIGN_SECRETKEYBYTES bytes');3100        }3101        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {3102            throw new SodiumException('publickey should be SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES bytes');3103        }3104 3105        if (self::useNewSodiumAPI()) {3106            return sodium_crypto_sign_keypair_from_secretkey_and_publickey($sk, $pk);3107        }3108        return $sk . $pk;3109    }