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PHP实现cookie的加密与解密函数方法
通过加密cookie可以使网站的安全性提高
<?php /** * 加密函数 * @param string $txt 需要加密的字符串 * @param string $key 密钥 * @return string 返回加密结果 */ function encrypt($txt, $key = ''){ if (empty($txt)) return $txt; if (empty($key)) $key = md5(MD5_KEY); $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_."; $ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm"; $nh1 = rand(0,64); $nh2 = rand(0,64); $nh3 = rand(0,64); $ch1 = $chars{$nh1}; $ch2 = $chars{$nh2}; $ch3 = $chars{$nh3}; $nhnum = $nh1 + $nh2 + $nh3; $knum = 0;$i = 0; while(isset($key{$i})) $knum +=ord($key{$i++}); $mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum%8,$knum%8 + 16); $txt = base64_encode(time().'_'.$txt); $txt = str_replace(array('+','/','='),array('-','_','.'),$txt); $tmp = ''; $j=0;$k = 0; $tlen = strlen($txt); $klen = strlen($mdKey); for ($i=0; $i<$tlen; $i++) { $k = $k == $klen ? 0 : $k; $j = ($nhnum+strpos($chars,$txt{$i})+ord($mdKey{$k++}))%64; $tmp .= $chars{$j}; } $tmplen = strlen($tmp); $tmp = substr_replace($tmp,$ch3,$nh2 % ++$tmplen,0); $tmp = substr_replace($tmp,$ch2,$nh1 % ++$tmplen,0); $tmp = substr_replace($tmp,$ch1,$knum % ++$tmplen,0); return $tmp; } /** * 解密函数 * @param string $txt 需要解密的字符串 * @param string $key 密匙 * @return string 字符串类型的返回结果 */ function decrypt($txt, $key = '', $ttl = 0){ if (empty($txt)) return $txt; if (empty($key)) $key = md5(MD5_KEY); $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_."; $ikey ="-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm"; $knum = 0;$i = 0; $tlen = @strlen($txt); while(isset($key{$i})) $knum +=ord($key{$i++}); $ch1 = @$txt{$knum % $tlen}; $nh1 = strpos($chars,$ch1); $txt = @substr_replace($txt,'',$knum % $tlen--,1); $ch2 = @$txt{$nh1 % $tlen}; $nh2 = @strpos($chars,$ch2); $txt = @substr_replace($txt,'',$nh1 % $tlen--,1); $ch3 = @$txt{$nh2 % $tlen}; $nh3 = @strpos($chars,$ch3); $txt = @substr_replace($txt,'',$nh2 % $tlen--,1); $nhnum = $nh1 + $nh2 + $nh3; $mdKey = substr(md5(md5(md5($key.$ch1).$ch2.$ikey).$ch3),$nhnum % 8,$knum % 8 + 16); $tmp = ''; $j=0; $k = 0; $tlen = @strlen($txt); $klen = @strlen($mdKey); for ($i=0; $i<$tlen; $i++) { $k = $k == $klen ? 0 : $k; $j = strpos($chars,$txt{$i})-$nhnum - ord($mdKey{$k++}); while ($j<0) $j+=64; $tmp .= $chars{$j}; } $tmp = str_replace(array('-','_','.'),array('+','/','='),$tmp); $tmp = trim(base64_decode($tmp)); if (preg_match("/\d{10}_/s",substr($tmp,0,11))){ if ($ttl > 0 && (time() - substr($tmp,0,11) > $ttl)){ $tmp = null; }else{ $tmp = substr($tmp,11); } } return $tmp; } echo encrypt('cmwl520','cmwl').'<br>'; echo decrypt('HPU_qNbbdE9ZxcFvqhbQJnJTAwY', 'cmwl');
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