<?php
$key = 'very important data';
function jiami($key, $str)
{
 /* Open module, and create IV */
 $td = mcrypt_module_open('des', '', 'ecb', '');
 //$td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');
 //$td = mcrypt_module_open('des', '', 'cbc', '');
 $key = substr($key, 0, mcrypt_enc_get_key_size($td));
 $iv_size = mcrypt_enc_get_iv_size($td);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 /* Initialize encryption handle */
 if (mcrypt_generic_init($td, $key, $iv) === -1)
 {
  return FALSE;
 }
 /* Encrypt data */
 $c_t = mcrypt_generic($td, $str);
 /* Clean up */
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return $c_t;
}
function jiemi($key, $str)
{
 /* Open module, and create IV */
 $td = mcrypt_module_open('des', '', 'ecb', '');
 //$td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, '');
 //$td = mcrypt_module_open('des', '', 'cbc', '');
 $key = substr($key, 0, mcrypt_enc_get_key_size($td));
 $iv_size = mcrypt_enc_get_iv_size($td);
 $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
 /* Initialize encryption handle */
 if (mcrypt_generic_init($td, $key, $iv) === -1)
 {
  return FALSE;
 }
 /* Reinitialize buffers for decryption */
 $p_t = mdecrypt_generic($td, $str);
 /* Clean up */
 mcrypt_generic_deinit($td);
 mcrypt_module_close($td);
 return trim($p_t);
}
$str = 'hello world!';
echo 'key:' . $key . '<br>';
echo 'str:' . $str . '<br>';
$jiami = jiami($key, $str);
echo '加密:' . $jiami . '<br>';
file_put_contents('jiamiqian.txt', $str);
file_put_contents('jiamihou.txt', $jiami);
$jiemi = jiemi($key, $jiami);
echo '解密:' . $jiemi . '<br>';