晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : /home/rainic/public_html/oldTZh/wp-includes/sodium_compat/src/Core/AES/KeySchedule.php
<?php

if (class_exists('ParagonIE_Sodium_Core_AES_KeySchedule', false)) {
    return;
}

/**
 * @internal This should only be used by sodium_compat
 */
class ParagonIE_Sodium_Core_AES_KeySchedule
{
    /** @var array<int, int> $skey -- has size 120 */
    protected $skey;

    /** @var bool $expanded */
    protected $expanded = false;

    /** @var int $numRounds */
    private $numRounds;

    /**
     * @param array $skey
     * @param int $numRounds
     */
    public function __construct(array $skey, $numRounds = 10)
    {
        $this->skey = $skey;
        $this->numRounds = $numRounds;
    }

    /**
     * Get a value at an arbitrary index. Mostly used for unit testing.
     *
     * @param int $i
     * @return int
     */
    public function get($i)
    {
        return $this->skey[$i];
    }

    /**
     * @return int
     */
    public function getNumRounds()
    {
        return $this->numRounds;
    }

    /**
     * @param int $offset
     * @return ParagonIE_Sodium_Core_AES_Block
     */
    public function getRoundKey($offset)
    {
        return ParagonIE_Sodium_Core_AES_Block::fromArray(
            array_slice($this->skey, $offset, 8)
        );
    }

    /**
     * Return an expanded key schedule
     *
     * @return ParagonIE_Sodium_Core_AES_Expanded
     */
    public function expand()
    {
        $exp = new ParagonIE_Sodium_Core_AES_Expanded(
            array_fill(0, 120, 0),
            $this->numRounds
        );
        $n = ($exp->numRounds + 1) << 2;
        for ($u = 0, $v = 0; $u < $n; ++$u, $v += 2) {
            $x = $y = $this->skey[$u];
            $x &= 0x55555555;
            $exp->skey[$v] = ($x | ($x << 1)) & ParagonIE_Sodium_Core_Util::U32_MAX;
            $y &= 0xAAAAAAAA;
            $exp->skey[$v + 1] = ($y | ($y >> 1)) & ParagonIE_Sodium_Core_Util::U32_MAX;
        }
        return $exp;
    }
}

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