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   1  <?php
   2  
   3  if (class_exists('ParagonIE_Sodium_Core32_HSalsa20', false)) {
   4      return;
   5  }
   6  
   7  /**
   8   * Class ParagonIE_Sodium_Core32_HSalsa20
   9   */
  10  abstract class ParagonIE_Sodium_Core32_HSalsa20 extends ParagonIE_Sodium_Core32_Salsa20
  11  {
  12      /**
  13       * Calculate an hsalsa20 hash of a single block
  14       *
  15       * HSalsa20 doesn't have a counter and will never be used for more than
  16       * one block (used to derive a subkey for xsalsa20).
  17       *
  18       * @internal You should not use this directly from another application
  19       *
  20       * @param string $in
  21       * @param string $k
  22       * @param string|null $c
  23       * @return string
  24       * @throws SodiumException
  25       * @throws TypeError
  26       */
  27      public static function hsalsa20($in, $k, $c = null)
  28      {
  29          /**
  30           * @var ParagonIE_Sodium_Core32_Int32 $x0
  31           * @var ParagonIE_Sodium_Core32_Int32 $x1
  32           * @var ParagonIE_Sodium_Core32_Int32 $x2
  33           * @var ParagonIE_Sodium_Core32_Int32 $x3
  34           * @var ParagonIE_Sodium_Core32_Int32 $x4
  35           * @var ParagonIE_Sodium_Core32_Int32 $x5
  36           * @var ParagonIE_Sodium_Core32_Int32 $x6
  37           * @var ParagonIE_Sodium_Core32_Int32 $x7
  38           * @var ParagonIE_Sodium_Core32_Int32 $x8
  39           * @var ParagonIE_Sodium_Core32_Int32 $x9
  40           * @var ParagonIE_Sodium_Core32_Int32 $x10
  41           * @var ParagonIE_Sodium_Core32_Int32 $x11
  42           * @var ParagonIE_Sodium_Core32_Int32 $x12
  43           * @var ParagonIE_Sodium_Core32_Int32 $x13
  44           * @var ParagonIE_Sodium_Core32_Int32 $x14
  45           * @var ParagonIE_Sodium_Core32_Int32 $x15
  46           * @var ParagonIE_Sodium_Core32_Int32 $j0
  47           * @var ParagonIE_Sodium_Core32_Int32 $j1
  48           * @var ParagonIE_Sodium_Core32_Int32 $j2
  49           * @var ParagonIE_Sodium_Core32_Int32 $j3
  50           * @var ParagonIE_Sodium_Core32_Int32 $j4
  51           * @var ParagonIE_Sodium_Core32_Int32 $j5
  52           * @var ParagonIE_Sodium_Core32_Int32 $j6
  53           * @var ParagonIE_Sodium_Core32_Int32 $j7
  54           * @var ParagonIE_Sodium_Core32_Int32 $j8
  55           * @var ParagonIE_Sodium_Core32_Int32 $j9
  56           * @var ParagonIE_Sodium_Core32_Int32 $j10
  57           * @var ParagonIE_Sodium_Core32_Int32 $j11
  58           * @var ParagonIE_Sodium_Core32_Int32 $j12
  59           * @var ParagonIE_Sodium_Core32_Int32 $j13
  60           * @var ParagonIE_Sodium_Core32_Int32 $j14
  61           * @var ParagonIE_Sodium_Core32_Int32 $j15
  62           */
  63          if (self::strlen($k) < 32) {
  64              throw new RangeException('Key must be 32 bytes long');
  65          }
  66          if ($c === null) {
  67              $x0  = new ParagonIE_Sodium_Core32_Int32(array(0x6170, 0x7865));
  68              $x5  = new ParagonIE_Sodium_Core32_Int32(array(0x3320, 0x646e));
  69              $x10 = new ParagonIE_Sodium_Core32_Int32(array(0x7962, 0x2d32));
  70              $x15 = new ParagonIE_Sodium_Core32_Int32(array(0x6b20, 0x6574));
  71          } else {
  72              $x0  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 0, 4));
  73              $x5  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 4, 4));
  74              $x10 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 8, 4));
  75              $x15 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($c, 12, 4));
  76          }
  77          $x1  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 0, 4));
  78          $x2  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 4, 4));
  79          $x3  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 8, 4));
  80          $x4  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 12, 4));
  81          $x6  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 0, 4));
  82          $x7  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 4, 4));
  83          $x8  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 8, 4));
  84          $x9  = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($in, 12, 4));
  85          $x11 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 16, 4));
  86          $x12 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 20, 4));
  87          $x13 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 24, 4));
  88          $x14 = ParagonIE_Sodium_Core32_Int32::fromReverseString(self::substr($k, 28, 4));
  89  
  90          for ($i = self::ROUNDS; $i > 0; $i -= 2) {
  91              $x4  = $x4->xorInt32($x0->addInt32($x12)->rotateLeft(7));
  92              $x8  = $x8->xorInt32($x4->addInt32($x0)->rotateLeft(9));
  93              $x12 = $x12->xorInt32($x8->addInt32($x4)->rotateLeft(13));
  94              $x0  = $x0->xorInt32($x12->addInt32($x8)->rotateLeft(18));
  95  
  96              $x9  = $x9->xorInt32($x5->addInt32($x1)->rotateLeft(7));
  97              $x13 = $x13->xorInt32($x9->addInt32($x5)->rotateLeft(9));
  98              $x1  = $x1->xorInt32($x13->addInt32($x9)->rotateLeft(13));
  99              $x5  = $x5->xorInt32($x1->addInt32($x13)->rotateLeft(18));
 100  
 101              $x14 = $x14->xorInt32($x10->addInt32($x6)->rotateLeft(7));
 102              $x2  = $x2->xorInt32($x14->addInt32($x10)->rotateLeft(9));
 103              $x6  = $x6->xorInt32($x2->addInt32($x14)->rotateLeft(13));
 104              $x10 = $x10->xorInt32($x6->addInt32($x2)->rotateLeft(18));
 105  
 106              $x3  = $x3->xorInt32($x15->addInt32($x11)->rotateLeft(7));
 107              $x7  = $x7->xorInt32($x3->addInt32($x15)->rotateLeft(9));
 108              $x11 = $x11->xorInt32($x7->addInt32($x3)->rotateLeft(13));
 109              $x15 = $x15->xorInt32($x11->addInt32($x7)->rotateLeft(18));
 110  
 111              $x1  = $x1->xorInt32($x0->addInt32($x3)->rotateLeft(7));
 112              $x2  = $x2->xorInt32($x1->addInt32($x0)->rotateLeft(9));
 113              $x3  = $x3->xorInt32($x2->addInt32($x1)->rotateLeft(13));
 114              $x0  = $x0->xorInt32($x3->addInt32($x2)->rotateLeft(18));
 115  
 116              $x6  = $x6->xorInt32($x5->addInt32($x4)->rotateLeft(7));
 117              $x7  = $x7->xorInt32($x6->addInt32($x5)->rotateLeft(9));
 118              $x4  = $x4->xorInt32($x7->addInt32($x6)->rotateLeft(13));
 119              $x5  = $x5->xorInt32($x4->addInt32($x7)->rotateLeft(18));
 120  
 121              $x11 = $x11->xorInt32($x10->addInt32($x9)->rotateLeft(7));
 122              $x8  = $x8->xorInt32($x11->addInt32($x10)->rotateLeft(9));
 123              $x9  = $x9->xorInt32($x8->addInt32($x11)->rotateLeft(13));
 124              $x10 = $x10->xorInt32($x9->addInt32($x8)->rotateLeft(18));
 125  
 126              $x12 = $x12->xorInt32($x15->addInt32($x14)->rotateLeft(7));
 127              $x13 = $x13->xorInt32($x12->addInt32($x15)->rotateLeft(9));
 128              $x14 = $x14->xorInt32($x13->addInt32($x12)->rotateLeft(13));
 129              $x15 = $x15->xorInt32($x14->addInt32($x13)->rotateLeft(18));
 130          }
 131  
 132          return $x0->toReverseString() .
 133              $x5->toReverseString() .
 134              $x10->toReverseString() .
 135              $x15->toReverseString() .
 136              $x6->toReverseString() .
 137              $x7->toReverseString() .
 138              $x8->toReverseString() .
 139              $x9->toReverseString();
 140      }
 141  }