本文实例讲述了PHP实现的DES加密解密实例。分享给大家供大家参考，具体如下：
<?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>'; 
