public function hash()
{
$stamp = '';
$rounds = pow(2, $this->getBits());
$bytes = $this->getBits() / 8 + (8 - $this->getBits() % 8) / 8;
$salt = $this->getSalt();
if (!$salt) {
$salt = base64_encode(Rand::data(16));
}
$baseStamp = $this->getVersion() . ':' . $this->getBits();
$baseStamp .= ':' . $this->getDate();
$baseStamp .= ':' . $this->getResource() . ':' . $this->getExtension() . ':';
$found = false;
$round = 0;
$testStamp = '';
$bits = 0;
$attemptSalts = array();
$attempt = 0;
for (; ($attempt < $this->getMintAttemptsMax() || !$this->getMintAttemptsMax()) && !$found; $attempt++) {
$attemptSalts[] = $salt;
$attemptStamp = $baseStamp . $salt . ':';
for ($round = 0; $round < $rounds; $round++) {
$testStamp = $attemptStamp . $round;
$found = $this->checkBitsFast(substr(hash('sha1', $testStamp, true), 0, $bytes), $bytes, $this->getBits());
if ($found) {
break;
}
}
if (!$found) {
$salt = base64_encode(Rand::data(16));
}
}
if ($found) {
$stamp = $testStamp;
$this->setSuffix($round);
$this->setSalt($salt);
$this->setAttempts($attempt);
$this->setHash(hash('sha1', $stamp));
} else {
$msg = 'Could not mine after ' . $attempt . ' attempts, ';
$msg .= 'each with ' . $rounds . ' rounds. ';
$msg .= 'bits=' . $this->getBits() . ', ';
$msg .= 'date=' . $this->getDate() . ', ';
$msg .= 'resource=' . $this->getResource() . ', ';
$msg .= 'salts=' . join(',', $attemptSalts);
gio::log($msg, E_USER_ERROR);
}
$this->setStamp($stamp);
return $stamp;
}
