Elgg\Database\SiteSecret Class Reference

Manages a site-specific secret key, encoded as a 32 byte string "secret". More...

Public Member Functions
	__construct ($key)
	Constructor. More...
	get ($raw=false)
	Returns the site secret. More...
	getStrength ()
	Get the strength of the site secret. More...

Static Public Member Functions
static	regenerate (Crypto $crypto, ConfigTable $table)
	Initialise the site secret (32 bytes: "z" to indicate format + 186-bit key in Base64 URL) and save to config table. More...
static	fromDatabase (ConfigTable $table)
	Create from config/storage. More...
static	fromConfig (ElggConfig $config)
	Create from a config value. More...

Public Attributes
const	CONFIG_KEY = '__site_secret__'

Detailed Description

Manages a site-specific secret key, encoded as a 32 byte string "secret".

The key can have two formats:

• Since 1.8.17 all keys generated are Base64URL-encoded with the 1st character set to "z" so that the format can be recognized. With one character lost, this makes the keys effectively 186 bits.
• Before 1.8.17 keys were hex-encoded (128 bits) but created from insufficiently random sources.

The hex keys were created with rand() as the only decent source of entropy (the site's creation time is not too difficult to find). As such, systems with a low getrandmax() value created particularly weak keys. You can check key string using getStrength().

Definition at line 24 of file SiteSecret.php.

Constructor & Destructor Documentation

Elgg\Database\SiteSecret::__construct

(

$key

)

Constructor.

Parameters

string

$key

Site key (32 hex chars, or "z" and 31 base64 chars)

Definition at line 33 of file SiteSecret.php.

Member Function Documentation

static Elgg\Database\SiteSecret::fromConfig ( ElggConfig  $config )

static

Create from a config value.

If successful, the value will be erased from config.

Parameters

ElggConfig

$config

Config

Returns

SiteSecret|false

Definition at line 142 of file SiteSecret.php.

static Elgg\Database\SiteSecret::fromDatabase ( ConfigTable  $table )

static

Create from config/storage.

Parameters

ConfigTable

$table

Config table

Returns

SiteSecret

Exceptions

InstallationException

Definition at line 126 of file SiteSecret.php.

Elgg\Database\SiteSecret::get

(

$raw = false

)

Returns the site secret.

Used to generate difficult to guess hashes for sessions and action tokens.

Parameters

bool

$raw

If true, a binary key will be returned

Returns

string Site secret

Definition at line 51 of file SiteSecret.php.

Elgg\Database\SiteSecret::getStrength

(

)

Get the strength of the site secret.

If "weak" or "moderate" is returned, this assumes we're running on the same system that created the key.

Returns

string "strong", "moderate", or "weak"

Definition at line 85 of file SiteSecret.php.

static Elgg\Database\SiteSecret::regenerate ( Crypto  $crypto, ConfigTable  $table  )

static

Initialise the site secret (32 bytes: "z" to indicate format + 186-bit key in Base64 URL) and save to config table.

Used during installation or regeneration.

Parameters

Crypto	$crypto	Crypto service
ConfigTable	$table	Config table

Returns

SiteSecret

Definition at line 110 of file SiteSecret.php.

Member Data Documentation

const Elgg\Database\SiteSecret::CONFIG_KEY = '__site_secret__'

Definition at line 26 of file SiteSecret.php.

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The documentation for this class was generated from the following file:

• engine/classes/Elgg/Database/SiteSecret.php