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