[Summary view] [Print] [Text view]

   1  <?php
   2  
   3  if (class_exists('ParagonIE_Sodium_Core32_XChaCha20', false)) {
   4      return;
   5  }
   6  
   7  /**
   8   * Class ParagonIE_Sodium_Core32_XChaCha20
   9   */
  10  class ParagonIE_Sodium_Core32_XChaCha20 extends ParagonIE_Sodium_Core32_HChaCha20
  11  {
  12      /**
  13       * @internal You should not use this directly from another application
  14       *
  15       * @param int $len
  16       * @param string $nonce
  17       * @param string $key
  18       * @return string
  19       * @throws SodiumException
  20       * @throws TypeError
  21       */
  22      public static function stream($len = 64, $nonce = '', $key = '')
  23      {
  24          if (self::strlen($nonce) !== 24) {
  25              throw new SodiumException('Nonce must be 24 bytes long');
  26          }
  27          return self::encryptBytes(
  28              new ParagonIE_Sodium_Core32_ChaCha20_Ctx(
  29                  self::hChaCha20(
  30                      self::substr($nonce, 0, 16),
  31                      $key
  32                  ),
  33                  self::substr($nonce, 16, 8)
  34              ),
  35              str_repeat("\x00", $len)
  36          );
  37      }
  38  
  39      /**
  40       * @internal You should not use this directly from another application
  41       *
  42       * @param string $message
  43       * @param string $nonce
  44       * @param string $key
  45       * @param string $ic
  46       * @return string
  47       * @throws SodiumException
  48       * @throws TypeError
  49       */
  50      public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
  51      {
  52          if (self::strlen($nonce) !== 24) {
  53              throw new SodiumException('Nonce must be 24 bytes long');
  54          }
  55          return self::encryptBytes(
  56              new ParagonIE_Sodium_Core32_ChaCha20_Ctx(
  57                  self::hChaCha20(self::substr($nonce, 0, 16), $key),
  58                  self::substr($nonce, 16, 8),
  59                  $ic
  60              ),
  61              $message
  62          );
  63      }
  64  
  65      /**
  66       * @internal You should not use this directly from another application
  67       *
  68       * @param string $message
  69       * @param string $nonce
  70       * @param string $key
  71       * @param string $ic
  72       * @return string
  73       * @throws SodiumException
  74       * @throws TypeError
  75       */
  76      public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
  77      {
  78          return self::encryptBytes(
  79              new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx(
  80                  self::hChaCha20(self::substr($nonce, 0, 16), $key),
  81                  "\x00\x00\x00\x00" . self::substr($nonce, 16, 8),
  82                  $ic
  83              ),
  84              $message
  85          );
  86      }
  87  }