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# mcrypt_enc_get_supported_key_sizes

(PHP 4 >= 4.0.2)

mcrypt_enc_get_supported_key_sizes -- Returns an array with the supported keysizes of the opened algorithm

## Description

array mcrypt_enc_get_supported_key_sizes ( resource td)

Returns an array with the key sizes supported by the algorithm specified by the encryption descriptor. If it returns an empty array then all key sizes between 1 and mcrypt_enc_get_key_size() are supported by the algorithm.

Example 1. mcrypt_enc_get_supported_key_sizes() example
    <?php
        $td = mcrypt_module_open ('rijndael-256', '', 'ecb', '');
        var_dump (mcrypt_enc_get_supported_key_sizes($td));
    ?>

    This will print:

    array(3) {
      [0]=>
      int(16)
      [1]=>
      int(24)
      [2]=>
      int(32)
    }
    ?>

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