wp/wp-includes/sodium_compat/src/Core/SipHash.php
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<?php
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if (class_exists('ParagonIE_Sodium_Core_SipHash', false)) {
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    return;
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}
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/**
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 * Class ParagonIE_SodiumCompat_Core_SipHash
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 *
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 * Only uses 32-bit arithmetic, while the original SipHash used 64-bit integers
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 */
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class ParagonIE_Sodium_Core_SipHash extends ParagonIE_Sodium_Core_Util
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{
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    /**
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     * @internal You should not use this directly from another application
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     *
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     * @param int[] $v
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     * @return int[]
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     *
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     */
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    public static function sipRound(array $v)
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    {
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        # v0 += v1;
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        list($v[0], $v[1]) = self::add(
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            array($v[0], $v[1]),
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            array($v[2], $v[3])
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        );
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        #  v1=ROTL(v1,13);
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        list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 13);
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        #  v1 ^= v0;
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        $v[2] = (int) $v[2] ^ (int) $v[0];
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        $v[3] = (int) $v[3] ^ (int) $v[1];
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        #  v0=ROTL(v0,32);
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        list($v[0], $v[1]) = self::rotl_64((int) $v[0], (int) $v[1], 32);
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        # v2 += v3;
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        list($v[4], $v[5]) = self::add(
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            array((int) $v[4], (int) $v[5]),
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            array((int) $v[6], (int) $v[7])
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        );
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        # v3=ROTL(v3,16);
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        list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 16);
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        #  v3 ^= v2;
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        $v[6] = (int) $v[6] ^ (int) $v[4];
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        $v[7] = (int) $v[7] ^ (int) $v[5];
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        # v0 += v3;
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        list($v[0], $v[1]) = self::add(
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            array((int) $v[0], (int) $v[1]),
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            array((int) $v[6], (int) $v[7])
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        );
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        # v3=ROTL(v3,21);
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        list($v[6], $v[7]) = self::rotl_64((int) $v[6], (int) $v[7], 21);
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        # v3 ^= v0;
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        $v[6] = (int) $v[6] ^ (int) $v[0];
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        $v[7] = (int) $v[7] ^ (int) $v[1];
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        # v2 += v1;
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        list($v[4], $v[5]) = self::add(
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            array((int) $v[4], (int) $v[5]),
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            array((int) $v[2], (int) $v[3])
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        );
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        # v1=ROTL(v1,17);
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        list($v[2], $v[3]) = self::rotl_64((int) $v[2], (int) $v[3], 17);
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        #  v1 ^= v2;;
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        $v[2] = (int) $v[2] ^ (int) $v[4];
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        $v[3] = (int) $v[3] ^ (int) $v[5];
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        # v2=ROTL(v2,32)
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        list($v[4], $v[5]) = self::rotl_64((int) $v[4], (int) $v[5], 32);
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        return $v;
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    }
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    /**
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     * Add two 32 bit integers representing a 64-bit integer.
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     *
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     * @internal You should not use this directly from another application
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     *
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     * @param int[] $a
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     * @param int[] $b
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     * @return array<int, mixed>
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     */
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    public static function add(array $a, array $b)
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    {
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        /** @var int $x1 */
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        $x1 = $a[1] + $b[1];
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        /** @var int $c */
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        $c = $x1 >> 32; // Carry if ($a + $b) > 0xffffffff
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        /** @var int $x0 */
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        $x0 = $a[0] + $b[0] + $c;
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        return array(
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            $x0 & 0xffffffff,
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            $x1 & 0xffffffff
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        );
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    }
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    /**
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     * @internal You should not use this directly from another application
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     *
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     * @param int $int0
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     * @param int $int1
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     * @param int $c
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     * @return array<int, mixed>
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     */
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    public static function rotl_64($int0, $int1, $c)
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    {
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        $int0 &= 0xffffffff;
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        $int1 &= 0xffffffff;
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        $c &= 63;
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        if ($c === 32) {
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            return array($int1, $int0);
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        }
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        if ($c > 31) {
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            $tmp = $int1;
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            $int1 = $int0;
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            $int0 = $tmp;
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            $c &= 31;
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        }
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        if ($c === 0) {
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            return array($int0, $int1);
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        }
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        return array(
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            0xffffffff & (
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                ($int0 << $c)
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                    |
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                ($int1 >> (32 - $c))
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            ),
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            0xffffffff & (
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                ($int1 << $c)
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                    |
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                ($int0 >> (32 - $c))
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            ),
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        );
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    }
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    /**
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     * Implements Siphash-2-4 using only 32-bit numbers.
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     *
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     * When we split an int into two, the higher bits go to the lower index.
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     * e.g. 0xDEADBEEFAB10C92D becomes [
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     *     0 => 0xDEADBEEF,
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     *     1 => 0xAB10C92D
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     * ].
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     *
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     * @internal You should not use this directly from another application
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     *
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     * @param string $in
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     * @param string $key
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     * @return string
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     * @throws SodiumException
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     * @throws TypeError
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     */
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    public static function sipHash24($in, $key)
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    {
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        $inlen = self::strlen($in);
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        # /* "somepseudorandomlygeneratedbytes" */
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        # u64 v0 = 0x736f6d6570736575ULL;
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        # u64 v1 = 0x646f72616e646f6dULL;
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        # u64 v2 = 0x6c7967656e657261ULL;
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        # u64 v3 = 0x7465646279746573ULL;
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        $v = array(
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            0x736f6d65, // 0
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            0x70736575, // 1
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            0x646f7261, // 2
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            0x6e646f6d, // 3
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            0x6c796765, // 4
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            0x6e657261, // 5
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            0x74656462, // 6
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            0x79746573  // 7
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   181
        );
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        // v0 => $v[0], $v[1]
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        // v1 => $v[2], $v[3]
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        // v2 => $v[4], $v[5]
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        // v3 => $v[6], $v[7]
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   186
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        # u64 k0 = LOAD64_LE( k );
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        # u64 k1 = LOAD64_LE( k + 8 );
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        $k = array(
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            self::load_4(self::substr($key, 4, 4)),
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            self::load_4(self::substr($key, 0, 4)),
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            self::load_4(self::substr($key, 12, 4)),
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            self::load_4(self::substr($key, 8, 4))
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        );
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        // k0 => $k[0], $k[1]
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        // k1 => $k[2], $k[3]
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   197
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        # b = ( ( u64 )inlen ) << 56;
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        $b = array(
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            $inlen << 24,
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            0
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        );
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        // See docblock for why the 0th index gets the higher bits.
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   204
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        # v3 ^= k1;
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        $v[6] ^= $k[2];
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        $v[7] ^= $k[3];
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        # v2 ^= k0;
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        $v[4] ^= $k[0];
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        $v[5] ^= $k[1];
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        # v1 ^= k1;
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        $v[2] ^= $k[2];
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        $v[3] ^= $k[3];
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        # v0 ^= k0;
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        $v[0] ^= $k[0];
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        $v[1] ^= $k[1];
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   217
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        $left = $inlen;
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        # for ( ; in != end; in += 8 )
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        while ($left >= 8) {
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            # m = LOAD64_LE( in );
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            $m = array(
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                self::load_4(self::substr($in, 4, 4)),
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                self::load_4(self::substr($in, 0, 4))
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            );
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   226
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            # v3 ^= m;
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            $v[6] ^= $m[0];
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            $v[7] ^= $m[1];
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   230
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            # SIPROUND;
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            # SIPROUND;
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            $v = self::sipRound($v);
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            $v = self::sipRound($v);
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   235
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            # v0 ^= m;
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            $v[0] ^= $m[0];
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            $v[1] ^= $m[1];
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   239
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            $in = self::substr($in, 8);
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            $left -= 8;
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        }
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   243
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        # switch( left )
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        #  {
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        #     case 7: b |= ( ( u64 )in[ 6] )  << 48;
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        #     case 6: b |= ( ( u64 )in[ 5] )  << 40;
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        #     case 5: b |= ( ( u64 )in[ 4] )  << 32;
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        #     case 4: b |= ( ( u64 )in[ 3] )  << 24;
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        #     case 3: b |= ( ( u64 )in[ 2] )  << 16;
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        #     case 2: b |= ( ( u64 )in[ 1] )  <<  8;
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        #     case 1: b |= ( ( u64 )in[ 0] ); break;
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        #     case 0: break;
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        # }
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        switch ($left) {
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            case 7:
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                $b[0] |= self::chrToInt($in[6]) << 16;
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            case 6:
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                $b[0] |= self::chrToInt($in[5]) << 8;
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            case 5:
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                $b[0] |= self::chrToInt($in[4]);
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            case 4:
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                $b[1] |= self::chrToInt($in[3]) << 24;
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            case 3:
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                $b[1] |= self::chrToInt($in[2]) << 16;
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            case 2:
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                $b[1] |= self::chrToInt($in[1]) << 8;
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            case 1:
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                $b[1] |= self::chrToInt($in[0]);
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            case 0:
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                break;
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        }
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        // See docblock for why the 0th index gets the higher bits.
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parents:
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   274
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        # v3 ^= b;
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        $v[6] ^= $b[0];
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        $v[7] ^= $b[1];
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parents:
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   278
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        # SIPROUND;
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parents:
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        # SIPROUND;
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        $v = self::sipRound($v);
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        $v = self::sipRound($v);
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parents:
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   283
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        # v0 ^= b;
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        $v[0] ^= $b[0];
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        $v[1] ^= $b[1];
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parents:
diff changeset
   287
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        // Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
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        # v2 ^= 0xff;
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        $v[5] ^= 0xff;
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parents:
diff changeset
   291
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        # SIPROUND;
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        # SIPROUND;
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        # SIPROUND;
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        # SIPROUND;
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        $v = self::sipRound($v);
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        $v = self::sipRound($v);
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        $v = self::sipRound($v);
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        $v = self::sipRound($v);
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        # b = v0 ^ v1 ^ v2 ^ v3;
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        # STORE64_LE( out, b );
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        return  self::store32_le($v[1] ^ $v[3] ^ $v[5] ^ $v[7]) .
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            self::store32_le($v[0] ^ $v[2] ^ $v[4] ^ $v[6]);
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    }
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}