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   1  <?php
   2  
   3  if (class_exists('ParagonIE_Sodium_Core_XChaCha20', false)) {
   4      return;
   5  }
   6  
   7  /**
   8   * Class ParagonIE_Sodium_Core_XChaCha20
   9   */
  10  class ParagonIE_Sodium_Core_XChaCha20 extends ParagonIE_Sodium_Core_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_Core_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 int $len
  43       * @param string $nonce
  44       * @param string $key
  45       * @return string
  46       * @throws SodiumException
  47       * @throws TypeError
  48       */
  49      public static function ietfStream($len = 64, $nonce = '', $key = '')
  50      {
  51          if (self::strlen($nonce) !== 24) {
  52              throw new SodiumException('Nonce must be 24 bytes long');
  53          }
  54          return self::encryptBytes(
  55              new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(
  56                  self::hChaCha20(
  57                      self::substr($nonce, 0, 16),
  58                      $key
  59                  ),
  60                  "\x00\x00\x00\x00" . self::substr($nonce, 16, 8)
  61              ),
  62              str_repeat("\x00", $len)
  63          );
  64      }
  65  
  66      /**
  67       * @internal You should not use this directly from another application
  68       *
  69       * @param string $message
  70       * @param string $nonce
  71       * @param string $key
  72       * @param string $ic
  73       * @return string
  74       * @throws SodiumException
  75       * @throws TypeError
  76       */
  77      public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')
  78      {
  79          if (self::strlen($nonce) !== 24) {
  80              throw new SodiumException('Nonce must be 24 bytes long');
  81          }
  82          return self::encryptBytes(
  83              new ParagonIE_Sodium_Core_ChaCha20_Ctx(
  84                  self::hChaCha20(self::substr($nonce, 0, 16), $key),
  85                  self::substr($nonce, 16, 8),
  86                  $ic
  87              ),
  88              $message
  89          );
  90      }
  91  
  92      /**
  93       * @internal You should not use this directly from another application
  94       *
  95       * @param string $message
  96       * @param string $nonce
  97       * @param string $key
  98       * @param string $ic
  99       * @return string
 100       * @throws SodiumException
 101       * @throws TypeError
 102       */
 103      public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')
 104      {
 105          if (self::strlen($nonce) !== 24) {
 106              throw new SodiumException('Nonce must be 24 bytes long');
 107          }
 108          return self::encryptBytes(
 109              new ParagonIE_Sodium_Core_ChaCha20_IetfCtx(
 110                  self::hChaCha20(self::substr($nonce, 0, 16), $key),
 111                  "\x00\x00\x00\x00" . self::substr($nonce, 16, 8),
 112                  $ic
 113              ),
 114              $message
 115          );
 116      }
 117  }