JS前台加密,java后台解密实现

因项目需求，需要对用户信息进行加密(以登录为例),前台js中对用户名密码进行加密传输。

然后后台进行解密操作 先看一下效果图

未对其加密传输

对其加密传输

从以上可以看出如果不对其进行加密的话，用户的一些敏感信息将会被捕捉到

1.前台JS

<script type="text/javascript">$(function() {$("#btn").click(function() {var username = encode64($("#username").val()); //对数据加密var password = encode64($("#password").val());$("#username").val(username);$("#password").val(password);document.fm.submit(); //fm为form表单name})})// base64加密开始var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv"+ "wxyz0123456789+/" + "=";function encode64(input) {var output = "";var chr1, chr2, chr3 = "";var enc1, enc2, enc3, enc4 = "";var i = 0;do {chr1 = input.charCodeAt(i++);chr2 = input.charCodeAt(i++);chr3 = input.charCodeAt(i++);enc1 = chr1 >> 2;enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);enc4 = chr3 & 63;if (isNaN(chr2)) {enc3 = enc4 = 64;} else if (isNaN(chr3)) {enc4 = 64;}output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2)+ keyStr.charAt(enc3) + keyStr.charAt(enc4);chr1 = chr2 = chr3 = "";enc1 = enc2 = enc3 = enc4 = "";} while (i < input.length);return output;}// base64加密结束</script>

2、后台java代码private static char[] base64EncodeChars = new char[] { ‘A’, ‘B’, ‘C’, ‘D’,’E’, ‘F’, ‘G’, ‘H’, ‘I’, ‘J’, ‘K’, ‘L’, ‘M’, ‘N’, ‘O’, ‘P’, ‘Q’,’R’, ‘S’, ‘T’, ‘U’, ‘V’, ‘W’, ‘X’, ‘Y’, ‘Z’, ‘a’, ‘b’, ‘c’, ‘d’,’e’, ‘f’, ‘g’, ‘h’, ‘i’, ‘j’, ‘k’, ‘l’, ‘m’, ‘n’, ‘o’, ‘p’, ‘q’,’r’, ‘s’, ‘t’, ‘u’, ‘v’, ‘w’, ‘x’, ‘y’, ‘z’, ‘0’, ‘1’, ‘2’, ‘3’,’4′, ‘5’, ‘6’, ‘7’, ‘8’, ‘9’, ‘+’, ‘http://blog.csdn.net/’, };private static byte[] base64DecodeChars = new byte[] { -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 };/** * 解密 * @param str * @return */public static byte[] decode(String str) {byte[] data = str.getBytes();int len = data.length;ByteArrayOutputStream buf = new ByteArrayOutputStream(len);int i = 0;int b1, b2, b3, b4;while (i < len) {do {b1 = base64DecodeChars[data[i++]];} while (i < len && b1 == -1);if (b1 == -1) {break;}do {b2 = base64DecodeChars[data[i++]];} while (i < len && b2 == -1);if (b2 == -1) {break;}buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));do {b3 = data[i++];if (b3 == 61) {return buf.toByteArray();}b3 = base64DecodeChars[b3];} while (i < len && b3 == -1);if (b3 == -1) {break;}buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));do {b4 = data[i++];if (b4 == 61) {return buf.toByteArray();}b4 = base64DecodeChars[b4];} while (i < len && b4 == -1);if (b4 == -1) {break;}buf.write((int) (((b3 & 0x03) << 6) | b4));}return buf.toByteArray();}

System.out.println(new String(decode(username))); // 使用decode()方法进行解密

Java加密算法还包括如下：

MD5(Message Digest algorithm 5，，信息摘要算法)

SHA(Secure Hash Algorithm，安全散列算法)

HMAC(Hash Message Authentication Code，散列消息鉴别码)

待有时间研究这些复杂的高级加密算法

作者：itmyhome

源码：download

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