118 lines
3.7 KiB
PHP
118 lines
3.7 KiB
PHP
<?php
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/*
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* @link http://kodcloud.com/
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* @author warlee | e-mail:kodcloud@qq.com
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* @copyright warlee 2014.(Shanghai)Co.,Ltd
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* @license http://kodcloud.com/tools/licenses/license.txt
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*------
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* 字符串加解密类；
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* 一次一密；且定时解密有效
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* 可用于加密&动态key生成
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* demo：
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* 加密：echo Mcrypt::encode('abc','123');
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* 解密：echo Mcrypt::decode('9f843I0crjv5y0dWE_-uwzL_mZRyRb1ynjGK4I_IACQ','123');
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*/
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class Mcrypt{
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private static $default_key = 'a!takA:dlmcldEv,e';
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/**
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* 字符加密，一次一密,可定时解密有效
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*
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* @param string $string 原文
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* @param string $key 密钥
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* @param int $expiry 密文有效期,单位s,0 为永久有效
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* @return string 加密后的内容
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*/
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public static function encode($string,$key = '', $expiry = 0){
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$ckeyLength = 4;
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$key = md5($key ? $key : self::$default_key); //解密密匙
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$keya = md5(substr($key, 0, 16)); //做数据完整性验证
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$keyb = md5(substr($key, 16, 16)); //用于变化生成的密文 (初始化向量IV)
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$keyc = substr(md5(microtime()), - $ckeyLength);
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$cryptkey = $keya . md5($keya . $keyc);
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$keyLength = strlen($cryptkey);
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$string = sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string . $keyb), 0, 16) . $string;
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$stringLength = strlen($string);
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$rndkey = array();
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for($i = 0; $i <= 255; $i++) {
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$rndkey[$i] = ord($cryptkey[$i % $keyLength]);
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}
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$box = range(0, 255);
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// 打乱密匙簿，增加随机性
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for($j = $i = 0; $i < 256; $i++) {
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$j = ($j + $box[$i] + $rndkey[$i]) % 256;
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$tmp = $box[$i];
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$box[$i] = $box[$j];
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$box[$j] = $tmp;
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}
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// 加解密，从密匙簿得出密匙进行异或，再转成字符
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$result = '';
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for($a = $j = $i = 0; $i < $stringLength; $i++) {
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$a = ($a + 1) % 256;
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$j = ($j + $box[$a]) % 256;
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$tmp = $box[$a];
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$box[$a] = $box[$j];
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$box[$j] = $tmp;
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$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
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}
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$result = $keyc . str_replace('=', '', base64_encode($result));
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$result = str_replace(array('+', '/', '='),array('-', '_', '.'), $result);
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return $result;
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}
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/**
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* 字符解密，一次一密,可定时解密有效
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*
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* @param string $string 密文
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* @param string $key 解密密钥
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* @return string 解密后的内容
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*/
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public static function decode($string,$key = '')
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{
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$string = str_replace(array('-', '_', '.'),array('+', '/', '='), $string);
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$ckeyLength = 4;
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$key = md5($key ? $key : self::$default_key); //解密密匙
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$keya = md5(substr($key, 0, 16)); //做数据完整性验证
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$keyb = md5(substr($key, 16, 16)); //用于变化生成的密文 (初始化向量IV)
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$keyc = substr($string, 0, $ckeyLength);
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$cryptkey = $keya . md5($keya . $keyc);
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$keyLength = strlen($cryptkey);
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$string = base64_decode(substr($string, $ckeyLength));
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$stringLength = strlen($string);
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$rndkey = array();
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for($i = 0; $i <= 255; $i++) {
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$rndkey[$i] = ord($cryptkey[$i % $keyLength]);
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}
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$box = range(0, 255);
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// 打乱密匙簿，增加随机性
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for($j = $i = 0; $i < 256; $i++) {
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$j = ($j + $box[$i] + $rndkey[$i]) % 256;
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$tmp = $box[$i];
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$box[$i] = $box[$j];
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$box[$j] = $tmp;
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}
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// 加解密，从密匙簿得出密匙进行异或，再转成字符
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$result = '';
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for($a = $j = $i = 0; $i < $stringLength; $i++) {
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$a = ($a + 1) % 256;
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$j = ($j + $box[$a]) % 256;
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$tmp = $box[$a];
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$box[$a] = $box[$j];
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$box[$j] = $tmp;
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$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));
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}
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if ((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0)
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&& substr($result, 10, 16) == substr(md5(substr($result, 26) . $keyb), 0, 16)
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) {
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return substr($result, 26);
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} else {
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return '';
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}
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}
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} |