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mcrypt_enc_get_supported_key_sizes
Returns an array with the supported keysizes of the opened algorithm
(PHP 4 >= 4.0.2, PHP 5)
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 1293. 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)
}