452 lines
16 KiB
PHP
452 lines
16 KiB
PHP
<?php
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if (class_exists('ParagonIE_Sodium_Core32_Poly1305_State', false)) {
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return;
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}
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/**
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* Class ParagonIE_Sodium_Core32_Poly1305_State
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*/
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class ParagonIE_Sodium_Core32_Poly1305_State extends ParagonIE_Sodium_Core32_Util
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{
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/**
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* @var array<int, int>
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*/
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protected $buffer = array();
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/**
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* @var bool
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*/
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protected $final = false;
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/**
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* @var array<int, ParagonIE_Sodium_Core32_Int32>
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*/
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public $h;
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/**
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* @var int
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*/
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protected $leftover = 0;
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/**
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* @var array<int, ParagonIE_Sodium_Core32_Int32>
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*/
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public $r;
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/**
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* @var array<int, ParagonIE_Sodium_Core32_Int64>
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*/
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public $pad;
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/**
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* ParagonIE_Sodium_Core32_Poly1305_State constructor.
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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 $key
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* @throws InvalidArgumentException
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* @throws SodiumException
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* @throws TypeError
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*/
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public function __construct($key = '')
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{
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if (self::strlen($key) < 32) {
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throw new InvalidArgumentException(
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'Poly1305 requires a 32-byte key'
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);
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}
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/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
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$this->r = array(
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// st->r[0] = ...
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 0, 4))
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->setUnsignedInt(true)
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->mask(0x3ffffff),
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// st->r[1] = ...
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 3, 4))
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->setUnsignedInt(true)
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->shiftRight(2)
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->mask(0x3ffff03),
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// st->r[2] = ...
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 6, 4))
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->setUnsignedInt(true)
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->shiftRight(4)
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->mask(0x3ffc0ff),
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// st->r[3] = ...
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 9, 4))
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->setUnsignedInt(true)
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->shiftRight(6)
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->mask(0x3f03fff),
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// st->r[4] = ...
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 12, 4))
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->setUnsignedInt(true)
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->shiftRight(8)
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->mask(0x00fffff)
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);
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/* h = 0 */
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$this->h = array(
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new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
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new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
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new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
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new ParagonIE_Sodium_Core32_Int32(array(0, 0), true),
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new ParagonIE_Sodium_Core32_Int32(array(0, 0), true)
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);
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/* save pad for later */
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$this->pad = array(
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 16, 4))
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->setUnsignedInt(true)->toInt64(),
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 20, 4))
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->setUnsignedInt(true)->toInt64(),
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 24, 4))
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->setUnsignedInt(true)->toInt64(),
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($key, 28, 4))
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->setUnsignedInt(true)->toInt64(),
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);
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$this->leftover = 0;
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$this->final = false;
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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 $message
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* @return self
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* @throws SodiumException
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* @throws TypeError
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*/
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public function update($message = '')
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{
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$bytes = self::strlen($message);
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/* handle leftover */
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if ($this->leftover) {
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/** @var int $want */
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$want = ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE - $this->leftover;
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if ($want > $bytes) {
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$want = $bytes;
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}
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for ($i = 0; $i < $want; ++$i) {
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$mi = self::chrToInt($message[$i]);
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$this->buffer[$this->leftover + $i] = $mi;
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}
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// We snip off the leftmost bytes.
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$message = self::substr($message, $want);
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$bytes = self::strlen($message);
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$this->leftover += $want;
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if ($this->leftover < ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
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// We still don't have enough to run $this->blocks()
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return $this;
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}
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$this->blocks(
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self::intArrayToString($this->buffer),
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ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
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);
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$this->leftover = 0;
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}
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/* process full blocks */
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if ($bytes >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
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/** @var int $want */
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$want = $bytes & ~(ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE - 1);
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if ($want >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
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/** @var string $block */
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$block = self::substr($message, 0, $want);
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if (self::strlen($block) >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
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$this->blocks($block, $want);
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$message = self::substr($message, $want);
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$bytes = self::strlen($message);
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}
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}
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}
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/* store leftover */
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if ($bytes) {
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for ($i = 0; $i < $bytes; ++$i) {
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$mi = self::chrToInt($message[$i]);
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$this->buffer[$this->leftover + $i] = $mi;
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}
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$this->leftover = (int) $this->leftover + $bytes;
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}
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return $this;
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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 $message
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* @param int $bytes
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* @return self
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* @throws SodiumException
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* @throws TypeError
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*/
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public function blocks($message, $bytes)
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{
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if (self::strlen($message) < 16) {
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$message = str_pad($message, 16, "\x00", STR_PAD_RIGHT);
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}
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$hibit = ParagonIE_Sodium_Core32_Int32::fromInt((int) ($this->final ? 0 : 1 << 24)); /* 1 << 128 */
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$hibit->setUnsignedInt(true);
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$zero = new ParagonIE_Sodium_Core32_Int64(array(0, 0, 0, 0), true);
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/**
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* @var ParagonIE_Sodium_Core32_Int64 $d0
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* @var ParagonIE_Sodium_Core32_Int64 $d1
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* @var ParagonIE_Sodium_Core32_Int64 $d2
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* @var ParagonIE_Sodium_Core32_Int64 $d3
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* @var ParagonIE_Sodium_Core32_Int64 $d4
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* @var ParagonIE_Sodium_Core32_Int64 $r0
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* @var ParagonIE_Sodium_Core32_Int64 $r1
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* @var ParagonIE_Sodium_Core32_Int64 $r2
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* @var ParagonIE_Sodium_Core32_Int64 $r3
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* @var ParagonIE_Sodium_Core32_Int64 $r4
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*
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* @var ParagonIE_Sodium_Core32_Int32 $h0
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* @var ParagonIE_Sodium_Core32_Int32 $h1
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* @var ParagonIE_Sodium_Core32_Int32 $h2
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* @var ParagonIE_Sodium_Core32_Int32 $h3
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* @var ParagonIE_Sodium_Core32_Int32 $h4
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*/
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$r0 = $this->r[0]->toInt64();
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$r1 = $this->r[1]->toInt64();
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$r2 = $this->r[2]->toInt64();
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$r3 = $this->r[3]->toInt64();
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$r4 = $this->r[4]->toInt64();
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$s1 = $r1->toInt64()->mulInt(5, 3);
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$s2 = $r2->toInt64()->mulInt(5, 3);
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$s3 = $r3->toInt64()->mulInt(5, 3);
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$s4 = $r4->toInt64()->mulInt(5, 3);
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$h0 = $this->h[0];
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$h1 = $this->h[1];
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$h2 = $this->h[2];
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$h3 = $this->h[3];
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$h4 = $this->h[4];
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while ($bytes >= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE) {
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/* h += m[i] */
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$h0 = $h0->addInt32(
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 0, 4))
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->mask(0x3ffffff)
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)->toInt64();
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$h1 = $h1->addInt32(
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 3, 4))
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->shiftRight(2)
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->mask(0x3ffffff)
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)->toInt64();
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$h2 = $h2->addInt32(
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 6, 4))
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->shiftRight(4)
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->mask(0x3ffffff)
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)->toInt64();
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$h3 = $h3->addInt32(
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 9, 4))
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->shiftRight(6)
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->mask(0x3ffffff)
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)->toInt64();
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$h4 = $h4->addInt32(
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ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($message, 12, 4))
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->shiftRight(8)
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->orInt32($hibit)
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)->toInt64();
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/* h *= r */
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$d0 = $zero
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->addInt64($h0->mulInt64($r0, 27))
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->addInt64($s4->mulInt64($h1, 27))
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->addInt64($s3->mulInt64($h2, 27))
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->addInt64($s2->mulInt64($h3, 27))
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->addInt64($s1->mulInt64($h4, 27));
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$d1 = $zero
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->addInt64($h0->mulInt64($r1, 27))
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->addInt64($h1->mulInt64($r0, 27))
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->addInt64($s4->mulInt64($h2, 27))
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->addInt64($s3->mulInt64($h3, 27))
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->addInt64($s2->mulInt64($h4, 27));
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$d2 = $zero
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->addInt64($h0->mulInt64($r2, 27))
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->addInt64($h1->mulInt64($r1, 27))
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->addInt64($h2->mulInt64($r0, 27))
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->addInt64($s4->mulInt64($h3, 27))
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->addInt64($s3->mulInt64($h4, 27));
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$d3 = $zero
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->addInt64($h0->mulInt64($r3, 27))
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->addInt64($h1->mulInt64($r2, 27))
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->addInt64($h2->mulInt64($r1, 27))
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->addInt64($h3->mulInt64($r0, 27))
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->addInt64($s4->mulInt64($h4, 27));
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$d4 = $zero
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->addInt64($h0->mulInt64($r4, 27))
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->addInt64($h1->mulInt64($r3, 27))
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->addInt64($h2->mulInt64($r2, 27))
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->addInt64($h3->mulInt64($r1, 27))
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->addInt64($h4->mulInt64($r0, 27));
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/* (partial) h %= p */
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$c = $d0->shiftRight(26);
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$h0 = $d0->toInt32()->mask(0x3ffffff);
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$d1 = $d1->addInt64($c);
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$c = $d1->shiftRight(26);
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$h1 = $d1->toInt32()->mask(0x3ffffff);
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$d2 = $d2->addInt64($c);
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$c = $d2->shiftRight(26);
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$h2 = $d2->toInt32()->mask(0x3ffffff);
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$d3 = $d3->addInt64($c);
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$c = $d3->shiftRight(26);
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$h3 = $d3->toInt32()->mask(0x3ffffff);
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$d4 = $d4->addInt64($c);
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$c = $d4->shiftRight(26);
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$h4 = $d4->toInt32()->mask(0x3ffffff);
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$h0 = $h0->addInt32($c->toInt32()->mulInt(5, 3));
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$c = $h0->shiftRight(26);
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$h0 = $h0->mask(0x3ffffff);
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$h1 = $h1->addInt32($c);
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// Chop off the left 32 bytes.
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$message = self::substr(
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$message,
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ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
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);
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$bytes -= ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE;
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}
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/** @var array<int, ParagonIE_Sodium_Core32_Int32> $h */
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$this->h = array($h0, $h1, $h2, $h3, $h4);
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return $this;
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}
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/**
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* @internal You should not use this directly from another application
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*
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* @return string
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* @throws SodiumException
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* @throws TypeError
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*/
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public function finish()
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{
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/* process the remaining block */
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if ($this->leftover) {
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$i = $this->leftover;
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$this->buffer[$i++] = 1;
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for (; $i < ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE; ++$i) {
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$this->buffer[$i] = 0;
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}
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$this->final = true;
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$this->blocks(
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self::substr(
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self::intArrayToString($this->buffer),
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0,
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ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
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),
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$b = ParagonIE_Sodium_Core32_Poly1305::BLOCK_SIZE
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);
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}
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/**
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* @var ParagonIE_Sodium_Core32_Int32 $f
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* @var ParagonIE_Sodium_Core32_Int32 $g0
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* @var ParagonIE_Sodium_Core32_Int32 $g1
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* @var ParagonIE_Sodium_Core32_Int32 $g2
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* @var ParagonIE_Sodium_Core32_Int32 $g3
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* @var ParagonIE_Sodium_Core32_Int32 $g4
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* @var ParagonIE_Sodium_Core32_Int32 $h0
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* @var ParagonIE_Sodium_Core32_Int32 $h1
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* @var ParagonIE_Sodium_Core32_Int32 $h2
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* @var ParagonIE_Sodium_Core32_Int32 $h3
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* @var ParagonIE_Sodium_Core32_Int32 $h4
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*/
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$h0 = $this->h[0];
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$h1 = $this->h[1];
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$h2 = $this->h[2];
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$h3 = $this->h[3];
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$h4 = $this->h[4];
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$c = $h1->shiftRight(26); # $c = $h1 >> 26;
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$h1 = $h1->mask(0x3ffffff); # $h1 &= 0x3ffffff;
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$h2 = $h2->addInt32($c); # $h2 += $c;
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$c = $h2->shiftRight(26); # $c = $h2 >> 26;
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$h2 = $h2->mask(0x3ffffff); # $h2 &= 0x3ffffff;
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$h3 = $h3->addInt32($c); # $h3 += $c;
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$c = $h3->shiftRight(26); # $c = $h3 >> 26;
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$h3 = $h3->mask(0x3ffffff); # $h3 &= 0x3ffffff;
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$h4 = $h4->addInt32($c); # $h4 += $c;
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$c = $h4->shiftRight(26); # $c = $h4 >> 26;
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$h4 = $h4->mask(0x3ffffff); # $h4 &= 0x3ffffff;
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$h0 = $h0->addInt32($c->mulInt(5, 3)); # $h0 += self::mul($c, 5);
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$c = $h0->shiftRight(26); # $c = $h0 >> 26;
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$h0 = $h0->mask(0x3ffffff); # $h0 &= 0x3ffffff;
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$h1 = $h1->addInt32($c); # $h1 += $c;
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/* compute h + -p */
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$g0 = $h0->addInt(5);
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$c = $g0->shiftRight(26);
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$g0 = $g0->mask(0x3ffffff);
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$g1 = $h1->addInt32($c);
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$c = $g1->shiftRight(26);
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$g1 = $g1->mask(0x3ffffff);
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$g2 = $h2->addInt32($c);
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$c = $g2->shiftRight(26);
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$g2 = $g2->mask(0x3ffffff);
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$g3 = $h3->addInt32($c);
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$c = $g3->shiftRight(26);
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$g3 = $g3->mask(0x3ffffff);
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$g4 = $h4->addInt32($c)->subInt(1 << 26);
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# $mask = ($g4 >> 31) - 1;
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/* select h if h < p, or h + -p if h >= p */
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$mask = (int) (($g4->toInt() >> 31) + 1);
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$g0 = $g0->mask($mask);
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$g1 = $g1->mask($mask);
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$g2 = $g2->mask($mask);
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$g3 = $g3->mask($mask);
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$g4 = $g4->mask($mask);
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/** @var int $mask */
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$mask = ~$mask;
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$h0 = $h0->mask($mask)->orInt32($g0);
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$h1 = $h1->mask($mask)->orInt32($g1);
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$h2 = $h2->mask($mask)->orInt32($g2);
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$h3 = $h3->mask($mask)->orInt32($g3);
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$h4 = $h4->mask($mask)->orInt32($g4);
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/* h = h % (2^128) */
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$h0 = $h0->orInt32($h1->shiftLeft(26));
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$h1 = $h1->shiftRight(6)->orInt32($h2->shiftLeft(20));
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$h2 = $h2->shiftRight(12)->orInt32($h3->shiftLeft(14));
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$h3 = $h3->shiftRight(18)->orInt32($h4->shiftLeft(8));
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/* mac = (h + pad) % (2^128) */
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$f = $h0->toInt64()->addInt64($this->pad[0]);
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$h0 = $f->toInt32();
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$f = $h1->toInt64()->addInt64($this->pad[1])->addInt($h0->overflow);
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$h1 = $f->toInt32();
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$f = $h2->toInt64()->addInt64($this->pad[2])->addInt($h1->overflow);
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$h2 = $f->toInt32();
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|
$f = $h3->toInt64()->addInt64($this->pad[3])->addInt($h2->overflow);
|
|
$h3 = $f->toInt32();
|
|
|
|
return $h0->toReverseString() .
|
|
$h1->toReverseString() .
|
|
$h2->toReverseString() .
|
|
$h3->toReverseString();
|
|
}
|
|
}
|