/* * 加密,可逆 * 可接受任何字符 * 安全度非常高 */ function encrypt($txt, $key = 'anihc ctI') { $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); $txt = base64_encode($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 $tmp; } /* * 解密 * */ function decrypt($txt, $key = 'anihc ctI') { $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); return base64_decode($tmp); }
提个词吧