·

11.22K

· narven

function random_password($length = 8)
{
 // start with a blank password
 $password = "";

 // define possible characters - any character in this string can be
 // picked for use in the password, so if you want to put vowels back in
 // or add special characters such as exclamation marks, this is where
 // you should do it
 $possible = "2346789bcdfghjkmnpqrtvwxyzBCDFGHJKLMNPQRTVWXYZ";

 // we refer to the length of $possible a few times, so let's grab it now
 $maxlength = strlen($possible);

 // check for length overflow and truncate if necessary
 if ($length > $maxlength) {
 $length = $maxlength;
}

// set up a counter for how many characters are in the password so far
 $i = 0;

 // add random characters to $password until $length is reached
 while ($i < $length) {

 // pick a random character from the possible ones
 $char = substr($possible, mt_rand(0, $maxlength-1), 1);

 // have we already used this character in $password?
 if (!strstr($password, $char)) {
 // no, so it's OK to add it onto the end of whatever we've already got...
 $password .= $char;
 // ... and increase the counter by one
 $i++;
}
}

// done!
return $password;
}

 function encrypt($plaintext, $salt)
 {
 $td = mcrypt_module_open('cast-256', '', 'ecb', '');
 $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 mcrypt_generic_init($td, $salt, $iv);
 $encrypted_data = mcrypt_generic($td, $plaintext);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 $encoded_64 = base64_encode($encrypted_data);
 return trim($encoded_64);
 }

 function decrypt($crypttext, $salt)
 {
 $decoded_64=base64_decode($crypttext);
 $td = mcrypt_module_open('cast-256', '', 'ecb', '');
 $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 mcrypt_generic_init($td, $salt, $iv);
 $decrypted_data = mdecrypt_generic($td, $decoded_64);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return trim($decrypted_data);
 }

** USAGE **

// encrypt
$salt = random_password();
$crypted_password = encrypt("YOUR_PASSWORD", $salt);

// decrypt
echo decrypt($crypted_password, $salt);

Related protips

Have a fresh tip? Share with Coderwall community!

Post

Post a tip

Sponsored by

#native_company#

#native_desc#

#native_cta#

Post a job for only 299ドル

Sponsored by #native_company# — Learn More