/**
* Tests a string against a shash value
*
* @access public
* @param string the string to test
* @param string the shash to test against
* @param int the seed value to use
* @param callback the hashing function to use
* @return bool
*/
function test_shash($str, $shash, $seed = null, $hash_alg = null)
{
// Parse any shash meta data
if (strpos($shash, SHASH_MAIN_DELIM) !== false) {
$shash = explode(SHASH_MAIN_DELIM, $shash);
if (count($shash) !== 3) {
return false;
}
// Seperate out the meta data
$shash_meta = $shash[1];
$shash = $shash[2];
// Parse the meta data
$shash_meta = explode(SHASH_SUB_DELIM, $shash_meta);
if (count($shash_meta) !== 2) {
return false;
}
$hash_alg = $shash_meta[0];
$seed = (int) $shash_meta[1];
}
// Check that we have all the needed data
if (!$seed || !$hash_alg || !(@function_exists($hash_alg) || is_callable($hash_alg))) {
return false;
}
// Check that the values match
$test_shash = shash($str, $seed, $hash_alg, false);
return $shash === $test_shash;
}
function hashMap($map)
{
$width = strlen($map['map'][0]);
$cells = rtrim(strtr(implode($map['map']), ['_' => 0, 'x' => 1]), '0');
return shash($width . '.' . $cells);
}