上週準備寫一個js版的uc_authcode函數,根據網上整理的資料:http://bbs.csdn.net/topics/390310377?page=1中Frogant的源碼(純JS版)進行相關測試,同時引入了md5.js和base64.js庫。測試結果的準確率不到一半,於是根據DX中的uc_authcode源碼進行跟蹤調試,發現問題出在base64的編碼上,可能是中外對字符串的編碼不一致導致的,後來在網上搜到其他版本的base64.js庫測試可用:http://download.csdn.net/detail/duyipeng/2034266上傳的資源可以測試通過。
注意:無論是js、java還是php的腳本文件的編碼必須爲utf-8編碼,否則可能會出現錯誤。原版的代碼在IE下兼容有一些問題,經過修改之後目前可兼容IE6,7,8,opera,firefox,google等瀏覽器。源代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style type="text/css">
</style>
</head>
<body>
<?php
if(isset($_GET['jsCode']))
{
//傳入的字符串
$jsCode = base64_decode($_GET['jsCode']);
p('jsCode:'.$jsCode);
//解碼後的字符串
$decode = uc_authcode($jsCode, 'DECODE', 'key');
p('解碼後:'.$decode);
//urldecode之後的字符串
p('urldecode後:'.urldecode($decode));
}else{
$en = '~!@#$%^&*()_+=-0987654321\][.,/';
$en_code = uc_authcode($en, 'ENCODE', 'key');
p(uc_authcode($en_code, 'DECODE', 'key'));
$cn = '屌絲(聯通)';
$cn_code = uc_authcode($cn, 'ENCODE', 'key');
p(uc_authcode($cn_code, 'DECODE', 'key'));
$str = urlencode('來自php加密');
$encode = uc_authcode($str, 'ENCODE', 'key');
}
function p($var)
{
echo "<pre>";
if($var === false)
{
echo 'false';
}else if($var === ''){
print_r("''");
}else{
print_r($var);
}
echo "</pre>";
}
/**
* @param string $string 加密內容
* @param string $operation 加密動作
* @param string $key 私鑰
* @param int $expiry 有效時間秒
* @return string 加密串
*/
function uc_authcode($string, $operation = 'DECODE', $key = '', $expiry = 0)
{
$ckey_length = 4;
$key = md5($key);
$keya = md5(substr($key, 0, 16));
$keyb = md5(substr($key, 16, 16));
$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';
$cryptkey = $keya.md5($keya.$keyc);
$key_length = strlen($cryptkey);
$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
$string_length = strlen($string);
$result = '';
$box = range(0, 255);
$rndkey = array();
for($i = 0; $i <= 255; $i++)
{
$rndkey[$i] = ord($cryptkey[$i % $key_length]);
}
for($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, 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 '';
}
}else{
return $keyc.str_replace('=', '', base64_encode($result));
}
}
?>
<div id="resultDiv"><?php echo $encode;?></div>
<script type="text/javascript" src="md5.min.js"></script>
<script type="text/javascript" src="base64.min.js"></script>
<script type="text/javascript">
/**
* @param string str 加密內容
* @param string operation 加密動作
* @param string key 密鑰
* @param int expiry 有效時間秒
* @return string 加密串
*/
function uc_authcode(str, operation, key, expiry) {
var operation = operation ? operation : 'DECODE';
var key = key ? key : '';
var expiry = expiry ? expiry : 0;
var ckey_length = 4;
key = md5(key);
// 密匙a會參與加解密
var keya = md5(key.substr(0, 16));
// 密匙b會用來做數據完整性驗證
var keyb = md5(key.substr(16, 16));
// 密匙c用於變化生成的密文
// IE下不支持substr第一個參數爲負數的情況
if(ckey_length){
if(operation == 'DECODE'){
var keyc = str.substr(0, ckey_length);
}else{
var md5_time = md5(microtime());
var start = md5_time.length - ckey_length;
var keyc = md5_time.substr(start, ckey_length)
}
}else{
var keyc = '';
}
// 參與運算的密匙
var cryptkey = keya + md5(keya + keyc);
var strbuf;
if (operation == 'DECODE') {
str = str.substr(ckey_length);
strbuf = base64_decode(str);
//string = b.toString();
} else {
expiry = expiry ? expiry + time() : 0;
tmpstr = expiry.toString();
if (tmpstr.length >= 10)
str = tmpstr.substr(0, 10) + md5(str + keyb).substr(0, 16) + str;
else {
var count = 10 - tmpstr.length;
for (var i = 0; i < count; i++) {
tmpstr = '0' + tmpstr;
}
str = tmpstr + md5(str + keyb).substr(0, 16) + str;
}
strbuf = str;
}
var box = new Array(256);
for (var i = 0; i < 256; i++) {
box[i] = i;
}
var rndkey = new Array();
// 產生密匙簿
for (var i = 0; i < 256; i++) {
rndkey[i] = cryptkey.charCodeAt(i % cryptkey.length);
}
// 用固定的算法,打亂密匙簿,增加隨機性,好像很複雜,實際上對並不會增加密文的強度
for (var j = i = 0; i < 256; i++) {
j = (j + box[i] + rndkey[i]) % 256;
tmp = box[i];
box[i] = box[j];
box[j] = tmp;
}
// 核心加解密部分
var s = '';
//IE下不支持直接通過下標訪問字符串的字符,需要先轉換爲數組
strbuf = strbuf.split('');
for (var a = j = i = 0; i < strbuf.length; i++) {
a = (a + 1) % 256;
j = (j + box[a]) % 256;
tmp = box[a];
box[a] = box[j];
box[j] = tmp;
// 從密匙簿得出密匙進行異或,再轉成字符
s += chr(ord(strbuf[i])^(box[(box[a] + box[j]) % 256]));
}
if (operation == 'DECODE') {
if ((s.substr(0, 10) == 0 || s.substr(0, 10) - time() > 0) && s.substr(10, 16) == md5(s.substr(26) + keyb).substr(0, 16)) {
s = s.substr(26);
} else {
s = '';
}
} else {
s = base64_encode(s);
var regex = new RegExp('=', "g");
s = s.replace(regex, '');
s = keyc + s;
}
return s;
}
function time() {
var unixtime_ms = new Date().getTime();
return parseInt(unixtime_ms / 1000);
}
function microtime(get_as_float) {
var unixtime_ms = new Date().getTime();
var sec = parseInt(unixtime_ms / 1000);
return get_as_float ? (unixtime_ms / 1000) : (unixtime_ms - (sec * 1000)) / 1000 + ' ' + sec;
}
function chr(s) {
return String.fromCharCode(s);
}
function ord(s) {
return s.charCodeAt();
}
function md5(str) {
return hex_md5(str);
}
var resultDiv = document.getElementById('resultDiv');
var str = resultDiv.innerHTML;
//php加密,js解密
document.write(uc_authcode(str, 'DECODE', 'key')+'<br/>');
//使用錯誤密鑰將會得到空字符串
document.write(uc_authcode(str, 'DECODE', 'errorkey')+'<br/>');
//英文測試,js加密解密
var en = '~!@#$%^&*()_+=-0987654321\][.,"\'></abcdefghijklmnopqrstuvwxyz';
var en_code = uc_authcode(en, 'ENCODE', 'key');
document.write(uc_authcode(en_code, 'DECODE', 'key')+'<br/>');
//中文測試,js加密解密,特殊編碼字符串需要通過手動進行encodeURI編碼解碼,暫未發現異常
var cn = encodeURI('屌絲聯通營業(),。?“:》《%……');
var cn_code = uc_authcode(cn, 'ENCODE', 'key');
document.write(cn_code+'<br/>');
resultDiv.innerHTML = '<a href="?jsCode='+base64_encode(cn_code)+'">點我使用php解碼</a>';
</script>
</body>
</html>
經過反覆嘗試,中文字符未採用duyipeng上傳的base64.js中的utf16to8編碼方式,而是採用js原生的encodeURI進行編碼,在php端同樣可以使用urlencode進行編碼。最後進行雙向測試,目前進行測試的字符全部加密解密成功,由此可以實現js和php進行無縫對接。
注意:在使用GET方式傳參過程中,經過uc_authcode之後的加密串可能會帶有空格等特殊字符,需要使用js版base64_encode進行編碼後傳輸,在php端使用php版base64_decode進行解碼,然後使用uc_authcode進行解密。
源碼下載地址:http://download.csdn.net/detail/zhengshuiguang/8289509
同樣,java在編碼中文字符的時候建議使用URLEncoder和URLDecoder進行編碼和解碼再加密。不過,本類中的encode和decode只是js的移植版,不保證絕對兼容,之所以這麼做是因爲直接使用org.apache.commons.codec.binary.Base64等編碼和解碼的時候遇到了其他語言加密java可以解密但是java加密後js或php都無法解密。
此java類在小數據量情況下基本上不會造成性能問題,大量數據通信暫未測試。(小範圍內測通過)
代碼如下:
package com.github.shuiguang.utils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;
import java.util.Date;
/**
* uc_authcode工具類
* @author shuiguang
*
*/
public class UCUtil {
public static final String base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
public static void main(String[] args) throws InterruptedException, IOException {
String operation = "DECODE";
String key = "key";
int expiry = 1;
String ucAuthcode = UCUtil.ucAuthcode(URLEncoder.encode("我的世界", "UTF-8"), "ENCODE", key, expiry);
// 打印出密文
System.out.println(ucAuthcode);
String result2 = UCUtil.ucAuthcode(ucAuthcode, operation, key, expiry);
// 密文未過期可以打印出明文
System.out.println("result2="+URLDecoder.decode(result2, "UTF-8"));
// 休眠1s後密文過期
Thread.sleep(1000);
String result3 = UCUtil.ucAuthcode(ucAuthcode, operation, key, expiry);
// 密文過期後打印出空字符串
System.out.println("result3="+URLDecoder.decode(result3, "UTF-8"));
}
/**
* 加密算法
* @param str 待加密內容
* @param operation 加密動作
* @param key 密鑰
* @param expiry 有效時間,單位s
* @return 加密後的字符串
* @throws UnsupportedEncodingException
*/
public static String ucAuthcode(String str, String operation, String key, int expiry) throws UnsupportedEncodingException {
int ckey_length = 4;
String defaultCharset = "UTF-8";
key = md5(key, defaultCharset);
// 密匙a會參與加解密
String keya = md5(key.substring(0, 16), defaultCharset);
// 密匙b會用來做數據完整性驗證
String keyb = md5(key.substring(16, 32), defaultCharset);
String keyc;
// 密匙c用於變化生成密文
keyc = "";
if(ckey_length > 0) {
if("DECODE".equals(operation)) {
keyc = str.substring(0, ckey_length);
}else{
String md5_time = md5(microtime(), defaultCharset);
int start = md5_time.length() - ckey_length;
keyc = md5_time.substring(start, start+ckey_length);
}
}
// 參與運算的密匙
String cryptkey = keya + md5(keya + keyc, defaultCharset);
String strbuf;
if("DECODE".equals(operation)) {
str = str.substring(ckey_length);
strbuf = decode(str);
}else{
expiry = expiry > 0 ? expiry + time() : 0;
String tmpstr = expiry + "";
if(tmpstr.length() >= 10) {
str = tmpstr.substring(0, 10) + md5(str + keyb, defaultCharset).substring(0, 16) + str;
}else{
int count = 10 - tmpstr.length();
for (int i = 0; i < count; i++) {
tmpstr = "0"+tmpstr;
}
str = tmpstr + md5(str + keyb, defaultCharset).substring(0, 16) + str;
}
strbuf = str;
}
int[] box = new int[256];
for (int i = 0; i < box.length; i++) {
box[i] = i;
}
char[] rndkey = new char[256];
for (int i = 0; i < rndkey.length; i++) {
rndkey[i] = cryptkey.charAt(i % cryptkey.length());
}
// 用固定算法打亂密匙薄,增加隨機性,好像很複雜,實際上並不會增加密文的強度
for (int i = 0, j = 0; i < 256; i++) {
j = (j + box[i] + rndkey[i]) % 256;
int tmp = box[i];
box[i] = box[j];
box[j] = tmp;
}
// 核心加密解密部分
String s = "";
char[] charArray = strbuf.toCharArray();
for (int a = 0, i = 0, j = 0; i < charArray.length; i++) {
a = (a + 1) % 256;
j = (j + box[a]) % 256;
int tmp = box[a];
box[a] = box[j];
box[j] = tmp;
// 從密匙薄得出密匙進行異或,再轉成字符
char c = (char) (charArray[i]^box[(box[a] + box[j]) % 256]);
s += c + "";
}
if("DECODE".equals(operation)) {
int prefix;
// 與js差異之一
try{
prefix = Integer.parseInt(s.substring(0, 10));
}catch(Exception e) {
prefix = 0;
}
if(("0000000000".equals(s.substring(0, 10)) || prefix - time() > 0) && md5(s.substring(26) + keyb, defaultCharset).substring(0, 16).equals(s.substring(10, 26))) {
s = s.substring(26);
}else{
s = "";
}
}else{
s = encode(s);
s = s.replaceAll("=", "");
s = keyc + s;
}
return s;
}
/**
* 32位 md5 加密
* @author Z
* @param s
* @param charset
* @return String 加密後的32位長度的字符串
*/
public final static String md5(String s, String charset) {
try {
byte[] btInput = s.getBytes(charset);
MessageDigest mdInst = MessageDigest.getInstance("MD5");
mdInst.update(btInput);
byte[] md = mdInst.digest();
StringBuffer sb = new StringBuffer();
for (int i = 0; i < md.length; i++) {
int val = ((int) md[i]) & 0xff;
if (val < 16){
sb.append("0");
}
sb.append(Integer.toHexString(val));
}
return sb.toString();
} catch (Exception e) {
return null;
}
}
/**
* 返回當前微秒數
* @return
*/
public static String microtime() {
long unixtime_ms = new Date().getTime();
int sec = (int) unixtime_ms / 1000;
return (unixtime_ms - (sec * 1000)) / 1000 + " " + sec;
}
/**
* 獲取當前Unix時間秒數
* @return
*/
public static int time() {
long time = new Date().getTime()/1000;
return (int) time;
}
/**
* base64編碼(純英文)
* @param str
* @return
*/
private static String encode(String str) {
String out = "";
int i = 0;
int len = 0;
int c1, c2, c3;
len = str.length();
while(i < len) {
c1 = (int) str.charAt(i++) & 0xff;
if(i == len)
{
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt((c1 & 0x3) << 4);
out += "==";
break;
}
c2 = (int) str.charAt(i++);
if(i == len)
{
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt((c2 & 0xF) << 2);
out += "=";
break;
}
c3 = (int) str.charAt(i++);
out += base64EncodeChars.charAt(c1 >> 2);
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
out += base64EncodeChars.charAt(c3 & 0x3F);
}
return out;
}
/**
* base64解碼(純英文)
* @param str
* @return
*/
private static String decode(String str) {
int[] base64DecodeChars = new int[]{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1};
int c1, c2, c3, c4;
int i = 0;
int len = 0;
String out = "";
len = str.length();
while(i < len) {
/* c1 */
do {
c1 = base64DecodeChars[(int) str.charAt(i++) & 0xff];
} while(i < len && c1 == -1);
if(c1 == -1)
break;
/* c2 */
do {
c2 = base64DecodeChars[(int) str.charAt(i++) & 0xff];
} while(i < len && c2 == -1);
if(c2 == -1)
break;
out += (char) ((c1 << 2) | ((c2 & 0x30) >> 4)) + "";
/* c3 */
do {
c3 = ((int) str.charAt(i++) & 0xff);
if(c3 == 61)
return out;
c3 = base64DecodeChars[c3];
} while(i < len && c3 == -1);
if(c3 == -1)
break;
out += (char) (((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2)) + "";
/* c4 */
do {
// 與js差異之二
try{
c4 = (int) str.charAt(i++) & 0xff;
if(c4 == 61)
return out;
c4 = base64DecodeChars[c4];
} catch (Exception e) {
c4 = -1;
}
} while(i < len && c4 == -1);
if(c4 == -1)
break;
out += (char) (((c3 & 0x03) << 6) | c4) + "";
}
return out;
}
public static String ucAuthcode(String str, String operation, String key) throws UnsupportedEncodingException {
return ucAuthcode(str, operation, key, 0);
}
public static String ucAuthcode(String str, String operation) throws UnsupportedEncodingException {
return ucAuthcode(str, operation, "", 0);
}
}