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   1  <?php
   2  
   3  final class PhabricatorHashTestCase extends PhabricatorTestCase {
   4  
   5    public function testHashForIndex() {
   6      $map = array(
   7        'dog' => 'Aliif7Qjd5ct',
   8        'cat' => 'toudDsue3Uv8',
   9        'rat' => 'RswaKgTjqOuj',
  10        'bat' => 'rAkJKyX4YdYm',
  11      );
  12  
  13      foreach ($map as $input => $expect) {
  14        $this->assertEqual(
  15          $expect,
  16          PhabricatorHash::digestForIndex($input),
  17          "Input: {$input}");
  18      }
  19  
  20      // Test that the encoding produces 6 bits of entropy per byte.
  21      $entropy = array(
  22        'dog', 'cat', 'rat', 'bat', 'dig', 'fig', 'cot',
  23        'cut', 'fog', 'rig', 'rug', 'dug', 'mat', 'pat',
  24        'eat', 'tar', 'pot',
  25      );
  26  
  27      $seen = array();
  28      foreach ($entropy as $input) {
  29        $chars = preg_split('//', PhabricatorHash::digestForIndex($input));
  30        foreach ($chars as $char) {
  31          $seen[$char] = true;
  32        }
  33      }
  34  
  35      $this->assertEqual(
  36        (1 << 6),
  37        count($seen),
  38        "Distinct characters in hash of: {$input}");
  39    }
  40  
  41  }