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PhabricatorBcryptPasswordHasher.php
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Thu, Jul 18, 12:51

PhabricatorBcryptPasswordHasher.php
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<?php
final class PhabricatorBcryptPasswordHasher
extends PhabricatorPasswordHasher {
public function getHumanReadableName() {
return pht('bcrypt');
}
public function getHashName() {
return 'bcrypt';
}
public function getHashLength() {
return 60;
}
public function canHashPasswords() {
return function_exists('password_hash');
}
public function getInstallInstructions() {
return pht('Upgrade to PHP 5.5.0 or newer.');
}
public function getStrength() {
return 2.0;
}
public function getHumanReadableStrength() {
return pht("Good");
}
protected function getPasswordHash(PhutilOpaqueEnvelope $envelope) {
$raw_input = $envelope->openEnvelope();
$options = array(
'cost' => $this->getBcryptCost(),
);
$raw_hash = password_hash($raw_input, CRYPT_BLOWFISH, $options);
return new PhutilOpaqueEnvelope($raw_hash);
}
protected function verifyPassword(
PhutilOpaqueEnvelope $password,
PhutilOpaqueEnvelope $hash) {
return password_verify($password->openEnvelope(), $hash->openEnvelope());
}
protected function canUpgradeInternalHash(PhutilOpaqueEnvelope $hash) {
$info = password_get_info($hash->openEnvelope());
// NOTE: If the costs don't match -- even if the new cost is lower than
// the old cost -- count this as an upgrade. This allows costs to be
// adjusted down and hashing to be migrated toward the new cost if costs
// are ever configured too high for some reason.
$cost = idx($info['options'], 'cost');
if ($cost != $this->getBcryptCost()) {
return true;
}
return false;
}
private function getBcryptCost() {
// NOTE: The default cost is "10", but my laptop can do a hash of cost
// "12" in about 300ms. Since server hardware is often virtualized or old,
// just split the difference.
return 11;
}
}

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