XI. Crack functions
These functions allow you to use the CrackLib library to test the 'strength' of a
password. In order to use these functions, you must compile PHP with Crack support by using the
--with-crack option.
More information regarding CrackLib along with the library can be found at
http://www.users.dircon.co.uk/~crypto/.
Cracklib is useful in testing the 'strength' of a password that checks length, use of
upper and lower case and a check against the specified CrackLib dictionary. CrackLib will also give
helpful diagnostic messages that will help 'strengthen' the password.
This example shows how to open a CrackLib dictionary, test a given password, retrieve any
diagnostic messages, and close the dictionary.
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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);
?>
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Note: If crack_check() returns
TRUE, crack_getlastmessage() will
return 'strong password'.
- Table of Contents
- crack_opendict -- Opens a new CrackLib
dictionary
- crack_closedict -- Closes an open
CrackLib dictionary
- crack_check -- Performs an obscure check with
the given password
- crack_getlastmessage -- Returns the
message from the last obscure check
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