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：
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<?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>';
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希望本文所述对大家PHP程序设计有所帮助。