PHP加密解密函数
网上搜的PHP加密解密函数,保存下:
<?php //加密函数 function passport_encrypt($txt, $key) { srand((double)microtime() * 1000000); $encrypt_key = md5(rand(0, 32000)); $ctr = 0; $tmp = ''; for($i = 0;$i < strlen($txt); $i++) { $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr; $tmp .= $encrypt_key[$ctr].($txt[$i] ^ $encrypt_key[$ctr++]); } return base64_encode(passport_key($tmp, $key)); } //解密函数 function passport_decrypt($txt, $key) { $txt = passport_key(base64_decode($txt), $key); $tmp = ''; for($i = 0;$i < strlen($txt); $i++) { $md5 = $txt[$i]; $tmp .= $txt[++$i] ^ $md5; } return $tmp; } //上面两个函数用到的公共函数 function passport_key($txt, $encrypt_key) { $encrypt_key = md5($encrypt_key); $ctr = 0; $tmp = ''; for($i = 0; $i < strlen($txt); $i++) { $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr; $tmp .= $txt[$i] ^ $encrypt_key[$ctr++]; } return $tmp; } //---------------------------------------- //---------------------------------------- //-------------示例----------------------- //---------------------------------------- //---------------------------------------- // $str = '你好,我是+-!少林a b张三丰'; echo '<br>------key:aaa----------<br>'; echo $x = passport_encrypt($str,'aaa'); //值会变,其中一个如下 //AOdS7lWlU+IM+1fnALBV5QOOV7dchQfEX+MCwgf2U3BXeQcnVuNavgPAA+hbmlLJAWEHIVRnD7hYvgf/U+lS4gCKUrdVvVO3 echo '<br>-----------------------<br>'; echo passport_decrypt($x,'aaa'); echo '<br><br><br><br><br><br><br><br><br><br><br><br>'; echo '<br>------key:bbb----------<br>'; echo $y = passport_encrypt($str,'bbb'); //值会变,其中一个如下 //Ae0F5gD1C+oB9wC/DOZZ6AeKU7MCjleWUbEAmFGuAi4JLF8gUeFW4lKQUrYBmlrAA2MHIVcxBrMFv1PzXOha5QGABb8A7Qu/ echo '<br>-----------------------<br>'; echo passport_decrypt($y,'bbb'); ?>
还有一个是下面这样的,回头再研究
1 <?php 2 //加解密字符串函数,可以加密中文 3 /* 4 //加密 5 echo $encode = authcode('爱迪生', 'ENCODE', '3'); //DvAHOdGFqa8xK4CDLnbr2mE 6 //解密 7 echo $decode = authcode($encode, 'DECODE', '3'); //爱迪生 8 //密钥 9 $auth_key = 34577; 10 参数:$string字符串,$operation加密还是解密,$key密钥 11 */ 12 function authcode($string, $operation, $key = '') 13 { 14 $key = md5($key ? $key : $GLOBALS['auth_key']); 15 $key_length = strlen($key); 16 $string = $operation == 'DECODE' ? base64_decode($string) : substr(md5($string . $key), 0, 8) . $string; 17 $string_length = strlen($string); 18 $rndkey = $box = array(); 19 $result = ''; 20 for ($i = 0; $i <= 255; $i++) { 21 $rndkey[$i] = ord($key[$i % $key_length]); 22 $box[$i] = $i; 23 } 24 for ($j = $i = 0; $i < 256; $i++) { 25 $j = ($j + $box[$i] + $rndkey[$i]) % 256; 26 $tmp = $box[$i]; 27 $box[$i] = $box[$j]; 28 $box[$j] = $tmp; 29 } 30 for ($a = $j = $i = 0; $i < $string_length; $i++) { 31 $a = ($a + 1) % 256; 32 $j = ($j + $box[$a]) % 256; 33 $tmp = $box[$a]; 34 $box[$a] = $box[$j]; 35 $box[$j] = $tmp; 36 $result .= chr(ord($string[$i]) ^ $box[($box[$a] + $box[$j]) % 256]); 37 } 38 if ($operation == 'DECODE') { 39 if (substr($result, 0, 8) == substr(md5(substr($result, 8) . $key), 0, 8)) { 40 return substr($result, 8); 41 } else { 42 return ''; 43 } 44 } else { 45 return str_replace('=', '', base64_encode($result)); 46 } 47 } 48 ?>