Posted by yawnmoth on 06/07/07 02:18

<http://us.php.net/manual/en/ref.mcrypt.php> lists MCRYPT_ARCFOUR and
MCRYPT_ARCFOUR_IV. Both require a version of libmcrypt greater then
2.4.x. MCRYPT_ARCFOUR works just fine. MCRYPT_ARCFOUR_IV does not.
The following demonstrates:

<?php
$td = mcrypt_module_open(MCRYPT_ARCFOUR, '', MCRYPT_MODE_STREAM, '');
echo 'key size = '.mcrypt_enc_get_key_size($td)."\r\n";
echo 'block size = '.mcrypt_enc_get_block_size($td)."\r\n";
echo 'iv size = '.mcrypt_enc_get_iv_size($td)."\r\n";

echo "---";

$td = mcrypt_module_open(MCRYPT_ARCFOUR_IV, '', MCRYPT_MODE_STREAM,
'');
echo 'key size = '.mcrypt_enc_get_key_size($td)."\r\n";
echo 'block size = '.mcrypt_enc_get_block_size($td)."\r\n";
echo 'iv size = '.mcrypt_enc_get_iv_size($td)."\r\n";
?>

What do I need to do to be asble to use MCRYPT_ARCFOUR_IV? I'm
running PHP 5.2.2 on Windows XP. Thanks!

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