PHP_加密解密字符串.php
<?php//加解密字符串函数，可以加密中文/*//加密echo $encode = authcode(‘爱迪生‘, ‘ENCODE‘, ‘3‘); //DvAHOdGFqa8xK4CDLnbr2mE//解密echo $decode = authcode($encode, ‘DECODE‘, ‘3‘); //爱迪生//密钥$auth_key = 34577;参数：$string字符串，$operation加密还是解密，$key密钥*/function authcode($string, $operation, $key = ‘‘){ ???$key = md5($key ? $key : $GLOBALS[‘auth_key‘]); ???$key_length = strlen($key); ???$string = $operation == ‘DECODE‘ ? base64_decode($string) : substr(md5($string . $key), 0, 8) . $string; ???$string_length = strlen($string); ???$rndkey = $box = array(); ???$result = ‘‘; ???for ($i = 0; $i <= 255; $i++) { ???????$rndkey[$i] = ord($key[$i % $key_length]); ???????$box[$i] = $i; ???} ???for ($j = $i = 0; $i < 256; $i++) { ???????$j = ($j + $box[$i] + $rndkey[$i]) % 256; ???????$tmp = $box[$i]; ???????$box[$i] = $box[$j]; ???????$box[$j] = $tmp; ???} ???for ($a = $j = $i = 0; $i < $string_length; $i++) { ???????$a = ($a + 1) % 256; ???????$j = ($j + $box[$a]) % 256; ???????$tmp = $box[$a]; ???????$box[$a] = $box[$j]; ???????$box[$j] = $tmp; ???????$result .= chr(ord($string[$i]) ^ $box[($box[$a] + $box[$j]) % 256]); ???} ???if ($operation == ‘DECODE‘) { ???????if (substr($result, 0, 8) == substr(md5(substr($result, 8) . $key), 0, 8)) { ???????????return substr($result, 8); ???????} else { ???????????return ‘‘; ???????} ???} else { ???????return str_replace(‘=‘, ‘‘, base64_encode($result)); ???}}?>PHP_加密解密字符串
原文地址：https://www.cnblogs.com/thatme/p/10203092.html