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Pattern based Password Generator

Author : rolfvandekrol

This password generator allows you to generate passwords from a password pattern.
The function is
string genPassword(string $pattern[, array $chardef]).
Every char in $pattern has a specific meaning which is defined in $chardef. By default the following chars are set:
v => lowercase vowels
c => lowercase consonants
V => uppercase vowels
C => uppercase consonants
w => uppercase & lowercase vowels,
d => uppercase & lowercase consonants,
a => lowercase alphabet,
A => uppercase alphabet,
b => uppercase & lowercase alphabet
# => special chars: !@#$%^&*(){}[]:;-=\\_+|<>?,./
0 => numbers
y => numbers & lowercase alphabet
Y => numbers & uppercase alphabet
x => numbers & uppercase & lowercase alphabet
z => all previously mentioned chars together

PHP Example :

<? function genPassword($pattern,$chardef = array( 'v' => 'aeiouy', 'c' => 'bcdfghjklmnpqrstvwxz', 'V' => 'AEIOUY', 'C' => 'BCDFGHIJKLMNPQRSTVWXZ', 'w' => 'aeiouyAEIOUY', 'd' => 'bcdfghjklmnpqrstvwxzBCDFGHIJKLMNPQRSTVWXZ', 'a' => 'abcdefghijklmnopqrstuvwxyz', 'A' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'b' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', '#' => '!@#$%^&*(){}[]-=\_+|<>?,./', '0' => '1234567890', 'y' => 'abcdefghijklmnopqrstuvwxyz1234567890', 'Y' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890', 'x' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890', 'z' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*(){}[]-=\_+|<>?,./1234567890' )) { $output = ""; $chardef_keys = array_keys($chardef); for($i=0;$i<strlen($pattern);$i++) { if(in_array(substr($pattern,$i,1),$chardef_keys)) { $output .= substr($chardef[substr($pattern,$i,1)],rand(0,strlen($chardef[substr($pattern,$i,1)])-1),1); } } return $output; } ?>

Usage Example:

PHP Example :

<? echo(genPassword("cv0cv0cv")); /* generates a pronouncable and relatively easy to remember but hardly crackable password */ echo(genPassword("zzzzzzzzzz")); /* generates a completely random, hard to crack password. */ /* use your creativity to make other patterns. */ echo(genPassword("xxxxxxxx",array('x'=>'abcdef0123456789'))); /* generates a password, just containing hexadecimal numbers */ ?>

Other Example

Easy to remember password for the membership tutorials

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