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XI. Crack functions

Introduction

These functions allow you to use the CrackLib library to test the 'strength' of a password. The 'strength' of a password is tested by that checks length, use of upper and lower case and checked against the specified CrackLib dictionary. CrackLib will also give helpful diagnostic messages that will help 'strengthen' the password.

Requirements

More information regarding CrackLib along with the library can be found at http://www.users.dircon.co.uk/~crypto/.

Installation

In order to use these functions, you must compile PHP with Crack support by using the --with-crack[=DIR] option.

Runtime Configuration

This extension does not define any configuration directives.

Resource Types

This extension does not define any resource types.

Predefined Constants

This extension does not define any constants.

Examples

This example shows how to open a CrackLib dictionary, test a given password, retrieve any diagnostic messages, and close the dictionary.

Example 1. CrackLib example

<?php
// Open CrackLib Dictionary
$dictionary = crack_opendict('/usr/local/lib/pw_dict')
     or die('Unable to open CrackLib dictionary');

// Perform password check
$check = crack_check($dictionary, 'gx9A2s0x');

// Retrieve messages
$diag = crack_getlastmessage();
echo $diag; // 'strong password'

// Close dictionary
crack_closedict($dictionary);
?>

Note: If crack_check() returns TRUE, crack_getlastmessage() will return 'strong password'.

Table of Contents
crack_check -- Performs an obscure check with the given password
crack_closedict -- Closes an open CrackLib dictionary
crack_getlastmessage -- Returns the message from the last obscure check
crack_opendict -- Opens a new CrackLib dictionary
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