Mcrypt 函数
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mcrypt_module_get_supported_key_sizes

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_module_get_supported_key_sizes — Returns an array with the supported keysizes of the opened algorithm

说明

array mcrypt_module_get_supported_key_sizes ( string $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.

参数

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.

返回值

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.

参见

Mcrypt 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Returns an array with the supported keysizes of the opened algorithm

用户评论:

Daniel Bartlett <dan at lockedbox dot net> (12-Feb-2004 06:50)

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.