使用CakePHP和blowfish更改密码

我正在尝试设置一个表单，允许用户使用CakePHP2.3更改密码。使用的算法是河豚。我有以下三个字段：

<?php echo $this->Form->input('old_password', array('type' => 'password', 'autocomplete' => 'off')); ?>
<?php echo $this->Form->input('new_password', array('type' => 'password', 'autocomplete' => 'off')); ?>
<?php echo $this->Form->input('new_password_confirm', array('type' => 'password', 'autocomplete' => 'off', 'label' => 'Confirm Password')); ?>

问题是，即使我正确输入了旧密码，Cake也找不到用户，因为它似乎没有计算正确的散列。每次我使用相同的旧密码提交表单时，Cake每次都会生成不同的散列。这可能是因为我不了解blowfish/bcrypt算法是如何工作的，但我似乎无法理解它

---

我在这里遗漏了什么？

使用河豚哈希与使用其他哈希类型不同。从方法的API文档中：

比较散列：只需将最初散列的密码作为salt传递

这意味着您首先必须检索特定用户的哈希密码，然后将其用作salt。差不多

$user = $this->User->find('first', array(
  'conditions' => array(
    'User.id' => AuthComponent::user('id')
  ),
  'fields' => array('password')
));
$storedHash = $user['User']['password'];
$newHash = Security::hash($this->request->data['User']['old_password'], 'blowfish', $storedHash);
$correct = $storedHash == $newHash;

---

对于示例用户，很容易添加模型

链接来源：

---

这样更好：

$correct=strcmp（$storedHash，$newHash）==0

@MirkoPagliai为什么更好？@MirkoPagliai使用===不是更好吗？不确定链接中的何处回答了为什么首选strcmp。

$user = $this->User->find('first', array(
  'conditions' => array(
    'User.id' => AuthComponent::user('id')
  ),
  'fields' => array('password')
));
$storedHash = $user['User']['password'];
$newHash = Security::hash($this->request->data['User']['old_password'], 'blowfish', $storedHash);
$correct = $storedHash == $newHash;

/**
 * Users Model
 */
class Users extends AppModel
{
.........

public function beforeSave($options = array()) {
    parent::beforeSave($options);
    // Save new password is exist..?
    if (isset($this->data[$this->alias]['password'])==true) {
        // Security bcrypt Blowfish
        App::uses('Security', 'Utility');
        $hash = Security::hash($this->data[$this->alias]['password'], 'blowfish');
        $this->data[$this->alias]['password'] = $hash;
    }
    return true;
}

public function password_check($user_id = null, $password_check = null) {
    // Get password old
    $hash_old = $this->field('password',array('id'=>trim($user_id)));
    // Security bcrypt Blowfish
    App::uses('Security', 'Utility');
    $hash_new_check = Security::hash($password_check, 'blowfish', $hash_old);
    // Son iguales
    if($hash_new_check == $hash_old){
        return true;
    }
    return false;
}

public function password_update($user_id = null, $password_new = null) {
    // Update new password
    if($this->save(array('id'=>$user_id, 'password'=>$password_new))){
        return true;
    }
    return false;
}

    .........
}