An example of php DES encryption and decryption code

/**
 * php des encryption and decryption
 * by http://bbs.it-home.org
*/
 function do_mencrypt($input, $key)
{
 $input = str_replace(""n", "", $input);
 $input = str_replace(""t", "", $input);
 $input = str_replace(""r", "", $input);
 $key = substr(md5($key), 0, 24);
 $td = mcrypt_module_open('tripledes', '', 'ecb', '');
 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 mcrypt_generic_init($td, $key, $iv);
 $encrypted_data = mcrypt_generic($td, $input);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return trim(chop(base64_encode($encrypted_data)));
}
//$input - stuff to decrypt
//$key - the secret key to use
function do_mdecrypt($input, $key)
{
 $input = str_replace(""n", "", $input);
 $input = str_replace(""t", "", $input);
 $input = str_replace(""r", "", $input);
 $input = trim(chop(base64_decode($input)));
 $td = mcrypt_module_open('tripledes', '', 'ecb', '');
 $key = substr(md5($key), 0, 24);
 $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
 mcrypt_generic_init($td, $key, $iv);
 $decrypted_data = mdecrypt_generic($td, $input);
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return trim(chop($decrypted_data));
}
?>

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