(PHP 4 >= 4.0.2, PHP 5)
mcrypt_module_get_supported_key_sizes — Returns an array with the supported keysizes of the opened algorithm
$algorithm
[, string $lib_dir
] )Returns an array with the key sizes supported by the specified algorithm. If it returns an empty array then all key sizes between 1 and mcrypt_module_get_algo_key_size() are supported by the algorithm.
algorithm
The algorithm to be used.
lib_dir
The optional lib_dir parameter can contain the
location where the algorithm module is on the system.
Returns an array with the key sizes supported by the specified algorithm. If it returns an empty array then all key sizes between 1 and mcrypt_module_get_algo_key_size() are supported by the algorithm.
Daniel Bartlett <dan at lockedbox dot net> (2004-02-11 22:50:25)
A small bit of php for listing available encryption algorythms and their keysizes.
<?php
$cipher_dir = "/usr/local/lib/libmcrypt";
$algorithms = mcrypt_list_algorithms($cipher_dir);
echo "<html><head></head><body><table><tr>\n";
foreach ($algorithms as $cipher) {
echo "<td>" . $cipher . "</td><td>";
$ksizes = mcrypt_module_get_supported_key_sizes($cipher, $cipher_dir);
if($ksizes==NULL) echo mcrypt_module_get_algo_key_size($cipher, $cipher_dir);
else foreach ($ksizes as $size) {
echo $size . " ";
}
echo "</td></tr>\n";
}
echo "</table></body></html>\n";
?>
I hope some one finds it handy.