Zend Framework 3 & Doctrine Encrypt Module

Provides a Zend Framework 3 & Doctrine 2 encryption module.

Installation

composer require rkeet/zf-doctrine-encrypt

Requirements

• PHP 7.2 or greater (must have Sodium extension enabled)

If you're on Windows, using Xampp, the PHP 7.2 installation might not automatically enable the Sodium extension. If this the case, you'll get an error ('This is not implemented, as it is not possible to securely wipe memory from PHP'). Enable Sodium for PHP by adding this to your php.ini file:

extension = C:\xampp\php\ext\php_sodium.dll

This might also be applicable ot other local installations.

Configuration

Zend Framework

Make sure to add the module to you application configuration. In your modules.config.php make sure to include Keet\\Encrypt.

Additional

The configuration which is used makes use of aliases, such as hashing_service and encryption_adapter. You may override these with your own config to implement your own Service and/or Adapter classes. These will automatically be used by this module if the correct Interface classes are implemented. Make sure to read through the code before you do any of this though.

Module

*.dist files are provided. Copy these (remove extension) to your application and fill in the required key/salt values. If these are filled in, it works out of the box using Halite for encryption.

However, must be said, at the moment of writing this ReadMe, the Halite module contains duplicate const declarations, as such, you must disable your E_NOTICE warnings in your PHP config :(

Annotation Examples

Encryption

Simple, consider that you have an Address Entity, which under the EU GDPR regulation requires parts of the address, such as the street, to be encrypted. This uses the key & salt required for the config by default

To encrypt a street name, add @Encrypted like so:

/**
 * @var string
 * @ORM\Column(name="street", type="text", nullable=true)
 * @Encrypted
 */
protected $street;

By default the Encryption service assumes that the data to be encrypted is of the type string. However, you could have a requirement to encrypt another type of data, such as a house number. Non-string types are supported, but the type of data must be provided if not a string. You can do this like so:

/**
 * @var int
 * @ORM\Column(name="house_number", type="text", nullable=false)
 * @Encrypted(type="int")
 */
protected $houseNumber;

Supported types are found here.

Cyphertext representation

The cypher text always results in a string with varying length always longer than 255 chars. Therefore you should use a datatype capable of representing the full length of it. Be aware that any non-string property will be handled as a string representation in the database.

Hashing

Say you'd like to store a password, it should work in much of the same way as the above. However, it is data that should not be de-cryptable (and there's no need for it to ever be decrypted), thus you should hash it instead.

To hash something, like a password, add the @Hashed Annotation. See the example below.

/**
 * @var string
 * @ORM\Column(name="password", type="text", nullable=false)
 * @Hashed
 */
protected $password;

Note that, unlike @Encrypted, there aren't options to give a type. As we can't decrypt the data (it's one-way), there's no need to know what the original type was. The response will always be string value.

Controller Examples

Hashing

A HashingService is provided. This service also uses the HashingAdapter but provides functionality that can be used in Controllers and other classes, such as plugins. The service is registered under the alias 'hashing_service'. You can override 'hasing_service' in your own project to provide your own implementation.

The HashingService provides the ability to hash and verify strings. These are two separate operations, one one-way hashes a string. The other does the same (requires the hashed string) and then verifies that both strings are exactly the same (thus verifying).

In a Controller, to hash a string, simply do:

$secret = $this->getHashingService()->hash('correct horse battery staple');

To verify that your dealing the same string a next time, for example to compare passwords on login, do:

$verified = $this->getHashingService()->verify('correct horse battery staple', $secret);

$verified will be set to a boolean value.

To not store any entered data longer than you must, you could compare directly from form data, like so:

if($form->isValid() && $this->getHashingService()->verify($form->getData()['password_field'], $user->getPassword()) {
    // do other things
}

Encryption

An EncryptionService is also provided and works in much the same way as the HashingService. It provides functionality to encrypt and to decrypt data.

To encrypt data, do:

$encrypted = $this->getEncryptionService()->encrypt('correct horse battery staple');

To decrypt data, do:

$decrypted = $this->getEncryptionService()->decrypt($string);