Untitled

<?

	srand((double)microtime()*1000000 );
    $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_CFB, '');
    $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
    $ks = mcrypt_enc_get_key_size($td);
    $key = substr(sha1('secret_key'), 0, $ks);

    mcrypt_generic_init($td, $key, $iv);
    $ciphertext = mcrypt_generic($td, 'This is very important data');
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);

	/*decrypt*/
	mcrypt_generic_init($td, $key, $iv);
    $plaintext = mdecrypt_generic($td, $ciphertext);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
	
	print $iv . "\n";
    print trim($ciphertext) . "\n";
    print trim($plaintext) . "\n";
?>